/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/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:52:39,509 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:52:39,514 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:52:39,533 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:52:39,534 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:52:39,537 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:52:39,539 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:52:39,543 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:52:39,547 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:52:39,552 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:52:39,559 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:52:39,561 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:52:39,562 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:52:39,564 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:52:39,566 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:52:39,568 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:52:39,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:52:39,572 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:52:39,574 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:52:39,578 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:52:39,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:52:39,583 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:52:39,585 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:52:39,586 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:52:39,591 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:52:39,606 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:52:39,608 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:52:39,609 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:52:39,612 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 19:52:39,634 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:52:39,635 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:52:39,637 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:52:39,638 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:52:39,638 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:52:39,638 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:52:39,638 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:52:39,639 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:52:39,639 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:52:39,639 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:52:39,639 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:52:39,639 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:52:39,640 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:52:39,640 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:52:39,640 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:52:39,641 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:52:39,641 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:52:39,641 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:52:39,642 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:52:39,642 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:52:39,642 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:52:39,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:52:39,643 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:52:39,643 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:52:39,643 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:52:39,643 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:52:39,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:39,644 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:52:39,644 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:52:39,645 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 19:52:40,078 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:52:40,097 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:52:40,105 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:52:40,108 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:52:40,109 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:52:40,110 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 19:52:40,275 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1f7afd00/e6e0428965b1479d8ba2d3db2bc295d1/FLAG9f0ccd7bd [2020-07-21 19:52:41,171 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:52:41,173 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 19:52:41,199 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1f7afd00/e6e0428965b1479d8ba2d3db2bc295d1/FLAG9f0ccd7bd [2020-07-21 19:52:41,486 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a1f7afd00/e6e0428965b1479d8ba2d3db2bc295d1 [2020-07-21 19:52:41,514 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:52:41,523 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:52:41,529 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:52:41,530 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:52:41,538 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:52:41,541 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:52:41" (1/1) ... [2020-07-21 19:52:41,549 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e3e5214 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:41, skipping insertion in model container [2020-07-21 19:52:41,549 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:52:41" (1/1) ... [2020-07-21 19:52:41,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:52:41,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:52:42,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:52:42,051 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:52:42,093 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:52:42,135 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:52:42,136 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42 WrapperNode [2020-07-21 19:52:42,136 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:52:42,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:52:42,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:52:42,142 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:52:42,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,315 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,326 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,327 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,334 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (1/1) ... [2020-07-21 19:52:42,357 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:52:42,358 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:52:42,359 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:52:42,359 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:52:42,361 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (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 19:52:42,464 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:52:42,464 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:52:42,464 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:52:42,464 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:52:42,465 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:52:42,466 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:52:42,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:52:42,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:52:43,006 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:52:43,008 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:52:43,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:52:43 BoogieIcfgContainer [2020-07-21 19:52:43,020 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:52:43,024 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:52:43,025 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:52:43,031 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:52:43,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:52:41" (1/3) ... [2020-07-21 19:52:43,034 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b0b942 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:52:43, skipping insertion in model container [2020-07-21 19:52:43,034 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:52:42" (2/3) ... [2020-07-21 19:52:43,035 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b0b942 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:52:43, skipping insertion in model container [2020-07-21 19:52:43,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:52:43" (3/3) ... [2020-07-21 19:52:43,040 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-21 19:52:43,073 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:52:43,092 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:52:43,135 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:52:43,205 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:52:43,205 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:52:43,205 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:52:43,205 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:52:43,206 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:52:43,206 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:52:43,206 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:52:43,206 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:52:43,238 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-21 19:52:43,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:52:43,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:43,251 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:52:43,252 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:43,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:43,260 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-21 19:52:43,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:43,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358888045] [2020-07-21 19:52:43,271 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 19:52:43,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:43,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:43,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:43,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:43,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:43,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:43,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358888045] [2020-07-21 19:52:43,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:43,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:43,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858660220] [2020-07-21 19:52:43,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:43,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:43,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:43,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:43,567 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-21 19:52:43,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:43,680 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-21 19:52:43,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:43,684 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:52:43,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:43,707 INFO L225 Difference]: With dead ends: 93 [2020-07-21 19:52:43,708 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:52:43,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:43,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:52:43,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-21 19:52:43,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 19:52:43,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-21 19:52:43,804 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-21 19:52:43,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:43,806 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-21 19:52:43,806 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:43,807 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-21 19:52:43,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:52:43,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:43,809 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:52:44,024 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:44,026 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:44,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:44,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-21 19:52:44,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:44,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139763733] [2020-07-21 19:52:44,029 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 19:52:44,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:44,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:44,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:44,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:44,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:44,155 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:44,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139763733] [2020-07-21 19:52:44,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:44,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:44,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358223835] [2020-07-21 19:52:44,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:44,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:44,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:44,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,163 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-21 19:52:44,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:44,207 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-21 19:52:44,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:44,209 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:52:44,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:44,212 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:52:44,212 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:52:44,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:52:44,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 19:52:44,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:52:44,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-21 19:52:44,235 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-21 19:52:44,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:44,236 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-21 19:52:44,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:44,236 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-21 19:52:44,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:44,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:44,238 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:44,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:44,456 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:44,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:44,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-21 19:52:44,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:44,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541670336] [2020-07-21 19:52:44,459 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:52:44,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:44,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:44,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:44,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:44,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:44,603 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:44,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541670336] [2020-07-21 19:52:44,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:44,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:44,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093300780] [2020-07-21 19:52:44,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:44,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:44,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:44,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,609 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-21 19:52:44,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:44,651 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 19:52:44,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:44,653 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:44,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:44,655 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:52:44,656 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 19:52:44,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:44,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 19:52:44,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-21 19:52:44,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 19:52:44,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-21 19:52:44,675 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-21 19:52:44,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:44,676 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-21 19:52:44,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:44,676 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-21 19:52:44,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:44,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:44,679 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:44,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:44,896 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:44,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:44,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-21 19:52:44,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:44,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75560146] [2020-07-21 19:52:44,900 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 19:52:44,981 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:44,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:44,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:44,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:44,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:45,000 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:45,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75560146] [2020-07-21 19:52:45,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:45,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:45,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519859984] [2020-07-21 19:52:45,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:45,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:45,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:45,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,006 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-21 19:52:45,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:45,058 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-21 19:52:45,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:45,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:45,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:45,062 INFO L225 Difference]: With dead ends: 148 [2020-07-21 19:52:45,063 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 19:52:45,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 19:52:45,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-21 19:52:45,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 19:52:45,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-21 19:52:45,137 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-21 19:52:45,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:45,138 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-21 19:52:45,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:45,139 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-21 19:52:45,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:52:45,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:45,141 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:45,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:45,358 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:45,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:45,359 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-21 19:52:45,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:45,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066919028] [2020-07-21 19:52:45,361 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 19:52:45,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:45,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:45,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:45,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:45,440 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:45,441 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:45,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066919028] [2020-07-21 19:52:45,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:45,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:45,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069207235] [2020-07-21 19:52:45,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:45,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:45,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:45,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,446 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-21 19:52:45,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:45,480 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-21 19:52:45,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:45,482 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:52:45,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:45,484 INFO L225 Difference]: With dead ends: 244 [2020-07-21 19:52:45,485 INFO L226 Difference]: Without dead ends: 148 [2020-07-21 19:52:45,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-21 19:52:45,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-21 19:52:45,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 19:52:45,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-21 19:52:45,507 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-21 19:52:45,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:45,508 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-21 19:52:45,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:45,508 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-21 19:52:45,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:45,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:45,510 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:45,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:45,725 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:45,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:45,727 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-21 19:52:45,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:45,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414313073] [2020-07-21 19:52:45,729 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 19:52:45,794 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:45,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:45,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:45,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:45,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:45,819 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:45,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414313073] [2020-07-21 19:52:45,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:45,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:45,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076747953] [2020-07-21 19:52:45,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:45,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:45,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:45,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,823 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-21 19:52:45,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:45,852 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-21 19:52:45,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:45,853 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:45,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:45,855 INFO L225 Difference]: With dead ends: 219 [2020-07-21 19:52:45,855 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 19:52:45,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:45,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 19:52:45,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-21 19:52:45,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 19:52:45,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-21 19:52:45,879 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-21 19:52:45,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:45,879 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-21 19:52:45,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:45,880 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-21 19:52:45,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:45,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:45,882 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:46,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:46,102 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:46,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:46,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-21 19:52:46,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:46,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369410562] [2020-07-21 19:52:46,104 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 19:52:46,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:46,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:46,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:46,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:46,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:46,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369410562] [2020-07-21 19:52:46,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:46,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:46,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641547643] [2020-07-21 19:52:46,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:46,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:46,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:46,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,245 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-21 19:52:46,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:46,300 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-21 19:52:46,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:46,301 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:46,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:46,314 INFO L225 Difference]: With dead ends: 276 [2020-07-21 19:52:46,314 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 19:52:46,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 19:52:46,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-21 19:52:46,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 19:52:46,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-21 19:52:46,384 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-21 19:52:46,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:46,385 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-21 19:52:46,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:46,389 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-21 19:52:46,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:52:46,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:46,396 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:46,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:46,598 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:46,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:46,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-21 19:52:46,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:46,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364068341] [2020-07-21 19:52:46,600 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 19:52:46,663 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:46,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:46,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:46,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:46,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:46,691 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:46,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364068341] [2020-07-21 19:52:46,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:46,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:46,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842121344] [2020-07-21 19:52:46,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:46,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:46,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:46,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,695 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-21 19:52:46,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:46,730 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-21 19:52:46,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:46,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:52:46,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:46,735 INFO L225 Difference]: With dead ends: 472 [2020-07-21 19:52:46,736 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 19:52:46,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:46,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 19:52:46,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-21 19:52:46,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 19:52:46,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-21 19:52:46,761 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-21 19:52:46,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:46,761 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-21 19:52:46,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:46,762 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-21 19:52:46,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:46,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:46,764 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:46,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:46,980 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:46,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:46,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-21 19:52:46,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:46,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431152812] [2020-07-21 19:52:46,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:52:47,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:47,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:47,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:47,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:47,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:47,056 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:47,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431152812] [2020-07-21 19:52:47,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:47,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:47,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381787838] [2020-07-21 19:52:47,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:47,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:47,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:47,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,063 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-21 19:52:47,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:47,114 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-21 19:52:47,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:47,115 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:47,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:47,119 INFO L225 Difference]: With dead ends: 420 [2020-07-21 19:52:47,122 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 19:52:47,126 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 19:52:47,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-21 19:52:47,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 19:52:47,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-21 19:52:47,158 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-21 19:52:47,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:47,159 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-21 19:52:47,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:47,159 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-21 19:52:47,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:47,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:47,171 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:47,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:47,388 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:47,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:47,389 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-21 19:52:47,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:47,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1150783999] [2020-07-21 19:52:47,390 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 19:52:47,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:47,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:47,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:47,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:47,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:47,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:47,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1150783999] [2020-07-21 19:52:47,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:47,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:47,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541868544] [2020-07-21 19:52:47,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:47,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:47,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:47,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,464 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-21 19:52:47,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:47,498 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-21 19:52:47,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:47,499 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:47,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:47,505 INFO L225 Difference]: With dead ends: 524 [2020-07-21 19:52:47,505 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 19:52:47,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 19:52:47,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-21 19:52:47,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 19:52:47,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-21 19:52:47,541 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-21 19:52:47,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:47,546 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-21 19:52:47,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:47,546 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-21 19:52:47,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 19:52:47,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:47,549 INFO L422 BasicCegarLoop]: trace histogram [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 19:52:47,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:47,765 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:47,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:47,766 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-21 19:52:47,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:47,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494726597] [2020-07-21 19:52:47,768 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 19:52:47,824 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:47,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:47,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:47,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:47,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:47,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494726597] [2020-07-21 19:52:47,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:47,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:47,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669102796] [2020-07-21 19:52:47,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:47,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:47,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:47,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,858 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-21 19:52:47,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:47,928 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-21 19:52:47,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:47,930 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 19:52:47,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:47,938 INFO L225 Difference]: With dead ends: 924 [2020-07-21 19:52:47,938 INFO L226 Difference]: Without dead ends: 546 [2020-07-21 19:52:47,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:47,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-21 19:52:47,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-21 19:52:47,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-21 19:52:47,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-21 19:52:47,984 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-21 19:52:47,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:47,985 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-21 19:52:47,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:47,986 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-21 19:52:47,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:47,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:47,994 INFO L422 BasicCegarLoop]: trace histogram [1, 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 19:52:48,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:48,209 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:48,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:48,210 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-21 19:52:48,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:48,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87976426] [2020-07-21 19:52:48,212 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 19:52:48,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:48,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:48,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:48,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:48,305 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:48,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:48,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87976426] [2020-07-21 19:52:48,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:48,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:48,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285602943] [2020-07-21 19:52:48,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:48,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:48,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:48,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,310 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-21 19:52:48,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:48,362 INFO L93 Difference]: Finished difference Result 996 states and 1680 transitions. [2020-07-21 19:52:48,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:48,363 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:48,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:48,375 INFO L225 Difference]: With dead ends: 996 [2020-07-21 19:52:48,375 INFO L226 Difference]: Without dead ends: 994 [2020-07-21 19:52:48,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2020-07-21 19:52:48,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 768. [2020-07-21 19:52:48,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 768 states. [2020-07-21 19:52:48,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 1246 transitions. [2020-07-21 19:52:48,435 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 1246 transitions. Word has length 25 [2020-07-21 19:52:48,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:48,436 INFO L479 AbstractCegarLoop]: Abstraction has 768 states and 1246 transitions. [2020-07-21 19:52:48,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:48,436 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 1246 transitions. [2020-07-21 19:52:48,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:48,440 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:48,440 INFO L422 BasicCegarLoop]: trace histogram [1, 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 19:52:48,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:48,655 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:48,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:48,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1980005056, now seen corresponding path program 1 times [2020-07-21 19:52:48,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:48,658 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133696990] [2020-07-21 19:52:48,659 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 19:52:48,760 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:48,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:48,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:48,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:48,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:48,809 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:48,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133696990] [2020-07-21 19:52:48,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:48,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:48,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884537208] [2020-07-21 19:52:48,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:48,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:48,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:48,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,815 INFO L87 Difference]: Start difference. First operand 768 states and 1246 transitions. Second operand 3 states. [2020-07-21 19:52:48,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:48,868 INFO L93 Difference]: Finished difference Result 1148 states and 1856 transitions. [2020-07-21 19:52:48,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:48,870 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:48,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:48,880 INFO L225 Difference]: With dead ends: 1148 [2020-07-21 19:52:48,880 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 19:52:48,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:48,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 19:52:48,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 19:52:48,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 19:52:48,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-21 19:52:48,941 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-21 19:52:48,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:48,941 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-21 19:52:48,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:48,942 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-21 19:52:48,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 19:52:48,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:48,946 INFO L422 BasicCegarLoop]: trace histogram [1, 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 19:52:49,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:49,163 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:49,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:49,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-21 19:52:49,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:49,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479185130] [2020-07-21 19:52:49,165 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 19:52:49,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:49,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:49,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:49,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:49,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:49,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:49,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479185130] [2020-07-21 19:52:49,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:49,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:49,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155744449] [2020-07-21 19:52:49,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:49,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:49,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:49,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:49,271 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-21 19:52:49,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:49,340 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-21 19:52:49,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:49,341 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 19:52:49,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:49,354 INFO L225 Difference]: With dead ends: 1820 [2020-07-21 19:52:49,355 INFO L226 Difference]: Without dead ends: 1066 [2020-07-21 19:52:49,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:49,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-21 19:52:49,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-21 19:52:49,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-21 19:52:49,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-21 19:52:49,436 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-21 19:52:49,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:49,437 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-21 19:52:49,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:49,437 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-21 19:52:49,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:49,443 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:49,443 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 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 19:52:49,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:49,660 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:49,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:49,661 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-21 19:52:49,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:49,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807424519] [2020-07-21 19:52:49,663 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 19:52:49,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:49,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:49,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:49,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:49,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:49,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:49,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807424519] [2020-07-21 19:52:49,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:49,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:49,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606111261] [2020-07-21 19:52:49,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:49,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:49,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:49,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:49,766 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-21 19:52:49,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:49,839 INFO L93 Difference]: Finished difference Result 1916 states and 3096 transitions. [2020-07-21 19:52:49,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:49,840 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:49,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:49,865 INFO L225 Difference]: With dead ends: 1916 [2020-07-21 19:52:49,866 INFO L226 Difference]: Without dead ends: 1914 [2020-07-21 19:52:49,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:49,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1914 states. [2020-07-21 19:52:49,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1914 to 1528. [2020-07-21 19:52:49,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1528 states. [2020-07-21 19:52:49,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1528 states to 1528 states and 2358 transitions. [2020-07-21 19:52:49,979 INFO L78 Accepts]: Start accepts. Automaton has 1528 states and 2358 transitions. Word has length 26 [2020-07-21 19:52:49,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:49,981 INFO L479 AbstractCegarLoop]: Abstraction has 1528 states and 2358 transitions. [2020-07-21 19:52:49,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:49,983 INFO L276 IsEmpty]: Start isEmpty. Operand 1528 states and 2358 transitions. [2020-07-21 19:52:49,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:49,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:49,989 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 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 19:52:50,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:50,204 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:50,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:50,205 INFO L82 PathProgramCache]: Analyzing trace with hash -2002722098, now seen corresponding path program 1 times [2020-07-21 19:52:50,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:50,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126992326] [2020-07-21 19:52:50,206 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 19:52:50,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:50,259 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:50,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:50,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:50,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:50,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:50,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126992326] [2020-07-21 19:52:50,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:50,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:50,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929047613] [2020-07-21 19:52:50,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:50,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:50,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:50,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:50,287 INFO L87 Difference]: Start difference. First operand 1528 states and 2358 transitions. Second operand 3 states. [2020-07-21 19:52:50,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:50,340 INFO L93 Difference]: Finished difference Result 2284 states and 3512 transitions. [2020-07-21 19:52:50,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:50,341 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:50,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:50,355 INFO L225 Difference]: With dead ends: 2284 [2020-07-21 19:52:50,356 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 19:52:50,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:50,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 19:52:50,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-21 19:52:50,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 19:52:50,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-21 19:52:50,494 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-21 19:52:50,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:50,495 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-21 19:52:50,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:50,495 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-21 19:52:50,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:52:50,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:50,501 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 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 19:52:50,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:50,716 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:50,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:50,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-21 19:52:50,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:50,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013469120] [2020-07-21 19:52:50,719 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 19:52:50,776 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:50,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:50,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:50,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:50,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:50,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:50,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013469120] [2020-07-21 19:52:50,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:50,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:50,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432600828] [2020-07-21 19:52:50,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:50,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:50,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:50,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:50,799 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-21 19:52:50,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:50,875 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-21 19:52:50,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:50,876 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 19:52:50,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:50,894 INFO L225 Difference]: With dead ends: 3596 [2020-07-21 19:52:50,894 INFO L226 Difference]: Without dead ends: 2090 [2020-07-21 19:52:50,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:50,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-21 19:52:51,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-21 19:52:51,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-21 19:52:51,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-21 19:52:51,017 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-21 19:52:51,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:51,017 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-21 19:52:51,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:51,018 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-21 19:52:51,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:51,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:51,023 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 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 19:52:51,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:51,238 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:51,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:51,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-21 19:52:51,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:51,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031655512] [2020-07-21 19:52:51,241 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 19:52:51,295 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:51,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:51,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:51,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:51,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:51,311 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:51,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031655512] [2020-07-21 19:52:51,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:51,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:51,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769160908] [2020-07-21 19:52:51,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:51,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:51,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:51,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:51,320 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-21 19:52:51,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:51,401 INFO L93 Difference]: Finished difference Result 3692 states and 5672 transitions. [2020-07-21 19:52:51,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:51,402 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:51,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:51,431 INFO L225 Difference]: With dead ends: 3692 [2020-07-21 19:52:51,432 INFO L226 Difference]: Without dead ends: 3690 [2020-07-21 19:52:51,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:51,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3690 states. [2020-07-21 19:52:51,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3690 to 3048. [2020-07-21 19:52:51,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3048 states. [2020-07-21 19:52:51,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3048 states to 3048 states and 4454 transitions. [2020-07-21 19:52:51,582 INFO L78 Accepts]: Start accepts. Automaton has 3048 states and 4454 transitions. Word has length 27 [2020-07-21 19:52:51,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:51,583 INFO L479 AbstractCegarLoop]: Abstraction has 3048 states and 4454 transitions. [2020-07-21 19:52:51,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:51,583 INFO L276 IsEmpty]: Start isEmpty. Operand 3048 states and 4454 transitions. [2020-07-21 19:52:51,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:51,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:51,593 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 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 19:52:51,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:51,807 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:51,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:51,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1588017237, now seen corresponding path program 1 times [2020-07-21 19:52:51,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:51,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619637952] [2020-07-21 19:52:51,809 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 19:52:51,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:51,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:51,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:51,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:51,871 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:51,872 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:51,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619637952] [2020-07-21 19:52:51,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:51,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:51,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074856055] [2020-07-21 19:52:51,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:51,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:51,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:51,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:51,880 INFO L87 Difference]: Start difference. First operand 3048 states and 4454 transitions. Second operand 3 states. [2020-07-21 19:52:51,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:51,960 INFO L93 Difference]: Finished difference Result 4556 states and 6632 transitions. [2020-07-21 19:52:51,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:51,960 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:51,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:51,987 INFO L225 Difference]: With dead ends: 4556 [2020-07-21 19:52:51,988 INFO L226 Difference]: Without dead ends: 3082 [2020-07-21 19:52:51,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:52,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3082 states. [2020-07-21 19:52:52,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3082 to 3080. [2020-07-21 19:52:52,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-21 19:52:52,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-21 19:52:52,181 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-21 19:52:52,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:52,181 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-21 19:52:52,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:52,182 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-21 19:52:52,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:52:52,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:52,189 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 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 19:52:52,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:52,403 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:52,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:52,404 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-21 19:52:52,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:52,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503944629] [2020-07-21 19:52:52,405 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 19:52:52,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:52,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:52,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:52,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:52,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:52,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:52,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503944629] [2020-07-21 19:52:52,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:52,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:52,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287251583] [2020-07-21 19:52:52,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:52,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:52,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:52,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:52,490 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-21 19:52:52,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:52,601 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-21 19:52:52,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:52,602 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 19:52:52,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:52,629 INFO L225 Difference]: With dead ends: 7116 [2020-07-21 19:52:52,629 INFO L226 Difference]: Without dead ends: 4106 [2020-07-21 19:52:52,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:52,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-21 19:52:52,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-21 19:52:52,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-21 19:52:52,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-21 19:52:52,800 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-21 19:52:52,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:52,801 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-21 19:52:52,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:52,801 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-21 19:52:52,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:52:52,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:52,810 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 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 19:52:53,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:53,024 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:53,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:53,025 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-21 19:52:53,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:53,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288594391] [2020-07-21 19:52:53,026 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 19:52:53,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:53,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:53,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:53,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:53,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:53,090 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:53,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288594391] [2020-07-21 19:52:53,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:53,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:53,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84301490] [2020-07-21 19:52:53,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:53,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:53,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:53,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:53,093 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-21 19:52:53,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:53,195 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-21 19:52:53,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:53,197 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 19:52:53,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:53,252 INFO L225 Difference]: With dead ends: 6156 [2020-07-21 19:52:53,252 INFO L226 Difference]: Without dead ends: 4170 [2020-07-21 19:52:53,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:53,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-21 19:52:53,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-21 19:52:53,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-21 19:52:53,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-21 19:52:53,464 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-21 19:52:53,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:53,465 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-21 19:52:53,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:53,465 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-21 19:52:53,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:52:53,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:53,475 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 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 19:52:53,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:53,691 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:53,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:53,692 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-21 19:52:53,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:53,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555119979] [2020-07-21 19:52:53,694 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 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 19:52:53,758 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:53,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:53,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:53,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:53,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:53,785 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:53,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555119979] [2020-07-21 19:52:53,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:53,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:53,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911142841] [2020-07-21 19:52:53,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:53,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:53,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:53,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:53,787 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-21 19:52:54,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:54,011 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-21 19:52:54,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:54,012 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 19:52:54,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:54,048 INFO L225 Difference]: With dead ends: 12108 [2020-07-21 19:52:54,048 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 19:52:54,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:54,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 19:52:54,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-21 19:52:54,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 19:52:54,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-21 19:52:54,382 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-21 19:52:54,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:54,383 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-21 19:52:54,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:54,383 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-21 19:52:54,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 19:52:54,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:54,403 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 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 19:52:54,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:54,618 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:54,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:54,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-21 19:52:54,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:54,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135523144] [2020-07-21 19:52:54,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:54,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:54,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:54,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:54,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:54,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:54,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:54,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135523144] [2020-07-21 19:52:54,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:54,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:54,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603380268] [2020-07-21 19:52:54,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:54,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:54,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:54,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:54,694 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-21 19:52:54,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:54,870 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-21 19:52:54,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:54,871 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 19:52:54,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:54,908 INFO L225 Difference]: With dead ends: 9100 [2020-07-21 19:52:54,908 INFO L226 Difference]: Without dead ends: 9098 [2020-07-21 19:52:54,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:54,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-21 19:52:55,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-21 19:52:55,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 19:52:55,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-21 19:52:55,318 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-21 19:52:55,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:55,318 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-21 19:52:55,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:55,319 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-21 19:52:55,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 19:52:55,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:55,340 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 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 19:52:55,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:55,553 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:55,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:55,554 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-21 19:52:55,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:55,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133032507] [2020-07-21 19:52:55,555 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:55,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:55,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:55,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:55,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:55,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:55,614 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:55,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133032507] [2020-07-21 19:52:55,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:55,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:55,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314683294] [2020-07-21 19:52:55,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:55,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:55,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:55,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:55,617 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-21 19:52:55,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:55,835 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-21 19:52:55,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:55,835 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 19:52:55,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:55,891 INFO L225 Difference]: With dead ends: 13708 [2020-07-21 19:52:55,891 INFO L226 Difference]: Without dead ends: 13706 [2020-07-21 19:52:55,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:55,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-21 19:52:56,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-21 19:52:56,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-21 19:52:56,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-21 19:52:56,515 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-21 19:52:56,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:56,516 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-21 19:52:56,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:56,516 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-21 19:52:56,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 19:52:56,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:56,556 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 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 19:52:56,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:56,772 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:56,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:56,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-21 19:52:56,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:56,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959600164] [2020-07-21 19:52:56,775 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:56,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:52:56,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:56,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:56,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:56,858 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:56,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959600164] [2020-07-21 19:52:56,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:56,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:56,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549484032] [2020-07-21 19:52:56,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:56,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:56,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:56,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:56,861 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-21 19:52:57,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:57,178 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-21 19:52:57,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:57,179 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 19:52:57,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:57,252 INFO L225 Difference]: With dead ends: 27788 [2020-07-21 19:52:57,253 INFO L226 Difference]: Without dead ends: 15754 [2020-07-21 19:52:57,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:57,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-21 19:52:58,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-21 19:52:58,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-21 19:52:58,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-21 19:52:58,544 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-21 19:52:58,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:52:58,545 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-21 19:52:58,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:52:58,545 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-21 19:52:58,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 19:52:58,585 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:52:58,585 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 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 19:52:58,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:58,801 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:52:58,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:52:58,802 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-21 19:52:58,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:52:58,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616303264] [2020-07-21 19:52:58,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:52:58,854 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:52:58,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:52:58,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:52:58,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:52:58,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:52:58,875 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:52:58,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616303264] [2020-07-21 19:52:58,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:52:58,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:52:58,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264764628] [2020-07-21 19:52:58,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:52:58,881 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:52:58,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:52:58,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:58,882 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-21 19:52:59,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:52:59,232 INFO L93 Difference]: Finished difference Result 26252 states and 33544 transitions. [2020-07-21 19:52:59,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:52:59,233 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 19:52:59,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:52:59,363 INFO L225 Difference]: With dead ends: 26252 [2020-07-21 19:52:59,364 INFO L226 Difference]: Without dead ends: 26250 [2020-07-21 19:52:59,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:52:59,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26250 states. [2020-07-21 19:53:00,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26250 to 24200. [2020-07-21 19:53:00,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24200 states. [2020-07-21 19:53:00,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24200 states to 24200 states and 29958 transitions. [2020-07-21 19:53:00,416 INFO L78 Accepts]: Start accepts. Automaton has 24200 states and 29958 transitions. Word has length 30 [2020-07-21 19:53:00,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:00,417 INFO L479 AbstractCegarLoop]: Abstraction has 24200 states and 29958 transitions. [2020-07-21 19:53:00,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:00,418 INFO L276 IsEmpty]: Start isEmpty. Operand 24200 states and 29958 transitions. [2020-07-21 19:53:00,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 19:53:00,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:00,485 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 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 19:53:00,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:00,701 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:00,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:00,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1060054906, now seen corresponding path program 1 times [2020-07-21 19:53:00,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:00,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200911370] [2020-07-21 19:53:00,703 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:00,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:00,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:00,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:00,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:00,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:00,773 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:00,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200911370] [2020-07-21 19:53:00,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:00,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:00,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687458551] [2020-07-21 19:53:00,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:00,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:00,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:00,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:00,777 INFO L87 Difference]: Start difference. First operand 24200 states and 29958 transitions. Second operand 3 states. [2020-07-21 19:53:01,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:01,114 INFO L93 Difference]: Finished difference Result 36364 states and 44936 transitions. [2020-07-21 19:53:01,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:01,115 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 19:53:01,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:01,204 INFO L225 Difference]: With dead ends: 36364 [2020-07-21 19:53:01,204 INFO L226 Difference]: Without dead ends: 24586 [2020-07-21 19:53:01,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:01,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24586 states. [2020-07-21 19:53:02,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24586 to 24584. [2020-07-21 19:53:02,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-21 19:53:02,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-21 19:53:02,286 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-21 19:53:02,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:02,287 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-21 19:53:02,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:02,287 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-21 19:53:02,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 19:53:02,345 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:02,346 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 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 19:53:02,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:02,561 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:02,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:02,561 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-21 19:53:02,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:02,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1617803550] [2020-07-21 19:53:02,562 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:02,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:02,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:02,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:02,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:02,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:02,638 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:02,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1617803550] [2020-07-21 19:53:02,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:02,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:02,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460394610] [2020-07-21 19:53:02,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:02,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:02,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:02,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:02,641 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-21 19:53:03,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:03,140 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-21 19:53:03,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:03,140 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 19:53:03,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:03,265 INFO L225 Difference]: With dead ends: 55308 [2020-07-21 19:53:03,266 INFO L226 Difference]: Without dead ends: 31242 [2020-07-21 19:53:03,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:03,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-21 19:53:05,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-21 19:53:05,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-21 19:53:05,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-21 19:53:05,535 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-21 19:53:05,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:05,536 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-21 19:53:05,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:05,536 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-21 19:53:05,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 19:53:05,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:05,584 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 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 19:53:05,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:05,798 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:05,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:05,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-21 19:53:05,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:05,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571712262] [2020-07-21 19:53:05,799 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:05,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:05,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:05,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:05,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:05,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:05,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:05,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571712262] [2020-07-21 19:53:05,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:05,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:05,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420122705] [2020-07-21 19:53:05,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:05,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:05,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:05,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:05,858 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-21 19:53:06,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:06,964 INFO L93 Difference]: Finished difference Result 50698 states and 59399 transitions. [2020-07-21 19:53:06,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:06,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 19:53:06,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:07,146 INFO L225 Difference]: With dead ends: 50698 [2020-07-21 19:53:07,147 INFO L226 Difference]: Without dead ends: 50696 [2020-07-21 19:53:07,177 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:07,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50696 states. [2020-07-21 19:53:08,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50696 to 48648. [2020-07-21 19:53:08,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48648 states. [2020-07-21 19:53:08,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48648 states to 48648 states and 56326 transitions. [2020-07-21 19:53:08,272 INFO L78 Accepts]: Start accepts. Automaton has 48648 states and 56326 transitions. Word has length 31 [2020-07-21 19:53:08,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:08,273 INFO L479 AbstractCegarLoop]: Abstraction has 48648 states and 56326 transitions. [2020-07-21 19:53:08,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:08,273 INFO L276 IsEmpty]: Start isEmpty. Operand 48648 states and 56326 transitions. [2020-07-21 19:53:08,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 19:53:08,357 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:08,357 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 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 19:53:08,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:08,559 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:08,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:08,560 INFO L82 PathProgramCache]: Analyzing trace with hash 2044825213, now seen corresponding path program 1 times [2020-07-21 19:53:08,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:08,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198383658] [2020-07-21 19:53:08,562 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:08,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:08,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:08,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:08,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:08,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:08,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:08,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198383658] [2020-07-21 19:53:08,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:08,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:08,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431393013] [2020-07-21 19:53:08,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:08,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:08,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:08,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:08,617 INFO L87 Difference]: Start difference. First operand 48648 states and 56326 transitions. Second operand 3 states. [2020-07-21 19:53:09,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:09,661 INFO L93 Difference]: Finished difference Result 109064 states and 124934 transitions. [2020-07-21 19:53:09,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:09,661 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 19:53:09,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:09,662 INFO L225 Difference]: With dead ends: 109064 [2020-07-21 19:53:09,662 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:53:09,782 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:09,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:53:09,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:53:09,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:53:09,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:53:09,785 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 19:53:09,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:09,785 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:53:09,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:09,786 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:53:09,786 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:53:10,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:10,007 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:53:10,104 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:53:10,105 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:10,105 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:10,105 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:53:10,105 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:53:10,105 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:53:10,105 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-21 19:53:10,107 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-21 19:53:10,108 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-21 19:53:10,108 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-21 19:53:10,108 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-21 19:53:10,108 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-21 19:53:10,109 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,111 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,111 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,111 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,111 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-21 19:53:10,111 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,112 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,113 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,114 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 19:53:10,115 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-21 19:53:10,144 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:53:10 BoogieIcfgContainer [2020-07-21 19:53:10,144 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:53:10,149 INFO L168 Benchmark]: Toolchain (without parser) took 28629.73 ms. Allocated memory was 142.6 MB in the beginning and 921.2 MB in the end (delta: 778.6 MB). Free memory was 99.1 MB in the beginning and 348.1 MB in the end (delta: -249.0 MB). Peak memory consumption was 529.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:10,149 INFO L168 Benchmark]: CDTParser took 0.82 ms. Allocated memory is still 142.6 MB. Free memory is still 117.2 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 19:53:10,150 INFO L168 Benchmark]: CACSL2BoogieTranslator took 612.07 ms. Allocated memory is still 142.6 MB. Free memory was 99.1 MB in the beginning and 88.1 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:10,161 INFO L168 Benchmark]: Boogie Preprocessor took 216.36 ms. Allocated memory was 142.6 MB in the beginning and 200.3 MB in the end (delta: 57.7 MB). Free memory was 88.1 MB in the beginning and 177.6 MB in the end (delta: -89.5 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:10,162 INFO L168 Benchmark]: RCFGBuilder took 662.45 ms. Allocated memory is still 200.3 MB. Free memory was 177.6 MB in the beginning and 157.4 MB in the end (delta: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:10,166 INFO L168 Benchmark]: TraceAbstraction took 27120.37 ms. Allocated memory was 200.3 MB in the beginning and 921.2 MB in the end (delta: 720.9 MB). Free memory was 156.4 MB in the beginning and 348.1 MB in the end (delta: -191.8 MB). Peak memory consumption was 529.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:10,169 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.82 ms. Allocated memory is still 142.6 MB. Free memory is still 117.2 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 612.07 ms. Allocated memory is still 142.6 MB. Free memory was 99.1 MB in the beginning and 88.1 MB in the end (delta: 11.0 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 216.36 ms. Allocated memory was 142.6 MB in the beginning and 200.3 MB in the end (delta: 57.7 MB). Free memory was 88.1 MB in the beginning and 177.6 MB in the end (delta: -89.5 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 662.45 ms. Allocated memory is still 200.3 MB. Free memory was 177.6 MB in the beginning and 157.4 MB in the end (delta: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 27120.37 ms. Allocated memory was 200.3 MB in the beginning and 921.2 MB in the end (delta: 720.9 MB). Free memory was 156.4 MB in the beginning and 348.1 MB in the end (delta: -191.8 MB). Peak memory consumption was 529.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 26.8s, OverallIterations: 30, TraceHistogramMax: 1, AutomataDifference: 7.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2789 SDtfs, 1359 SDslu, 1909 SDs, 0 SdLazy, 160 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 747 GetRequests, 717 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=48648occurred in iteration=29, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 9.4s AutomataMinimizationTime, 30 MinimizatonAttempts, 8222 StatesRemovedByMinimization, 29 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 777 NumberOfCodeBlocks, 654 NumberOfCodeBlocksAsserted, 51 NumberOfCheckSat, 747 ConstructedInterpolants, 0 QuantifiedInterpolants, 38022 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3398 ConjunctsInSsa, 90 ConjunctsInUnsatCore, 30 InterpolantComputations, 30 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...