/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_10.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:16:02,374 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:16:02,376 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:16:02,388 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:16:02,389 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:16:02,390 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:16:02,391 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:16:02,393 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:16:02,395 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:16:02,396 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:16:02,396 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:16:02,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:16:02,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:16:02,404 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:16:02,405 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:16:02,407 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:16:02,408 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:16:02,412 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:16:02,414 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:16:02,417 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:16:02,421 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:16:02,423 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:16:02,424 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:16:02,427 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:16:02,429 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:16:02,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:16:02,444 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:16:02,446 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:16:02,447 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 16:16:02,469 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:16:02,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:16:02,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:16:02,471 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:16:02,471 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:16:02,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:16:02,472 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:16:02,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:16:02,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:16:02,472 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:16:02,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:16:02,474 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:16:02,474 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:16:02,474 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:16:02,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:16:02,475 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:16:02,475 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:16:02,475 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:16:02,475 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:16:02,475 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:16:02,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:16:02,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:02,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:16:02,477 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:16:02,478 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:16:02,751 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:16:02,766 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:16:02,770 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:16:02,772 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:16:02,772 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:16:02,773 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 16:16:02,843 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbe091580/e9d8fa7245cd40f99d43736b3b9657b1/FLAG1e100582b [2020-07-21 16:16:03,298 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:16:03,299 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c [2020-07-21 16:16:03,307 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbe091580/e9d8fa7245cd40f99d43736b3b9657b1/FLAG1e100582b [2020-07-21 16:16:03,707 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbe091580/e9d8fa7245cd40f99d43736b3b9657b1 [2020-07-21 16:16:03,714 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:16:03,717 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:16:03,718 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:03,719 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:16:03,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:16:03,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:03" (1/1) ... [2020-07-21 16:16:03,729 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54529d9a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:03, skipping insertion in model container [2020-07-21 16:16:03,729 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:03" (1/1) ... [2020-07-21 16:16:03,737 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:16:03,768 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:16:04,021 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:04,027 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:16:04,083 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:04,209 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:16:04,209 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04 WrapperNode [2020-07-21 16:16:04,209 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:04,210 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:16:04,210 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:16:04,210 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:16:04,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,233 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,233 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,252 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,264 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,265 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (1/1) ... [2020-07-21 16:16:04,271 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:16:04,272 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:16:04,276 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:16:04,276 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:16:04,277 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (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 16:16:04,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:16:04,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:16:04,337 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:16:04,337 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:16:04,337 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:16:04,337 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:16:04,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:16:04,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:16:04,616 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:16:04,616 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:16:04,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:04 BoogieIcfgContainer [2020-07-21 16:16:04,620 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:16:04,622 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:16:04,622 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:16:04,625 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:16:04,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:16:03" (1/3) ... [2020-07-21 16:16:04,626 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55dca098 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:04, skipping insertion in model container [2020-07-21 16:16:04,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:04" (2/3) ... [2020-07-21 16:16:04,627 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55dca098 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:04, skipping insertion in model container [2020-07-21 16:16:04,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:04" (3/3) ... [2020-07-21 16:16:04,629 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_10.c [2020-07-21 16:16:04,641 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:16:04,660 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:16:04,680 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:16:04,705 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:16:04,705 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:16:04,706 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:16:04,706 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:16:04,706 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:16:04,706 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:16:04,706 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:16:04,707 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:16:04,726 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-07-21 16:16:04,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:04,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:04,734 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] [2020-07-21 16:16:04,735 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:04,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:04,742 INFO L82 PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times [2020-07-21 16:16:04,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:04,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240439150] [2020-07-21 16:16:04,752 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 16:16:04,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:04,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:04,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:04,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:04,929 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 16:16:04,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:04,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240439150] [2020-07-21 16:16:04,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:04,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:04,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5611789] [2020-07-21 16:16:04,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:04,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:04,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:04,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:04,955 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 3 states. [2020-07-21 16:16:05,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:05,011 INFO L93 Difference]: Finished difference Result 87 states and 150 transitions. [2020-07-21 16:16:05,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:05,013 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:05,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:05,026 INFO L225 Difference]: With dead ends: 87 [2020-07-21 16:16:05,026 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 16:16:05,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 16:16:05,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 16:16:05,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 16:16:05,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 16:16:05,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions. [2020-07-21 16:16:05,077 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20 [2020-07-21 16:16:05,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:05,077 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 89 transitions. [2020-07-21 16:16:05,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:05,078 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions. [2020-07-21 16:16:05,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:05,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:05,079 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] [2020-07-21 16:16:05,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:05,294 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:05,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:05,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times [2020-07-21 16:16:05,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:05,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091613071] [2020-07-21 16:16:05,296 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 16:16:05,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:05,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:05,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:05,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:05,403 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 16:16:05,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:05,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091613071] [2020-07-21 16:16:05,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:05,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:05,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485132778] [2020-07-21 16:16:05,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:05,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:05,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:05,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:05,408 INFO L87 Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states. [2020-07-21 16:16:05,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:05,454 INFO L93 Difference]: Finished difference Result 117 states and 212 transitions. [2020-07-21 16:16:05,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:05,455 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:05,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:05,457 INFO L225 Difference]: With dead ends: 117 [2020-07-21 16:16:05,459 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 16:16:05,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 16:16:05,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 16:16:05,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2020-07-21 16:16:05,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 16:16:05,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions. [2020-07-21 16:16:05,473 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20 [2020-07-21 16:16:05,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:05,474 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 125 transitions. [2020-07-21 16:16:05,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:05,474 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions. [2020-07-21 16:16:05,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:05,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:05,475 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] [2020-07-21 16:16:05,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:05,683 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:05,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:05,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times [2020-07-21 16:16:05,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:05,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [452830641] [2020-07-21 16:16:05,688 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 16:16:05,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:05,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:05,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:05,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:05,759 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 16:16:05,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:05,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [452830641] [2020-07-21 16:16:05,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:05,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:05,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948200208] [2020-07-21 16:16:05,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:05,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:05,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:05,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:05,763 INFO L87 Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states. [2020-07-21 16:16:05,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:05,783 INFO L93 Difference]: Finished difference Result 108 states and 189 transitions. [2020-07-21 16:16:05,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:05,784 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:05,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:05,785 INFO L225 Difference]: With dead ends: 108 [2020-07-21 16:16:05,785 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 16:16:05,786 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 16:16:05,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 16:16:05,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2020-07-21 16:16:05,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 16:16:05,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions. [2020-07-21 16:16:05,797 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21 [2020-07-21 16:16:05,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:05,798 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 127 transitions. [2020-07-21 16:16:05,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:05,798 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions. [2020-07-21 16:16:05,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:05,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:05,799 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 16:16:06,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:06,014 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:06,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:06,014 INFO L82 PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times [2020-07-21 16:16:06,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:06,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302498603] [2020-07-21 16:16:06,015 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 16:16:06,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:06,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:06,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:06,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:06,085 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 16:16:06,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:06,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302498603] [2020-07-21 16:16:06,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:06,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:06,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922755326] [2020-07-21 16:16:06,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:06,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:06,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:06,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:06,088 INFO L87 Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states. [2020-07-21 16:16:06,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:06,111 INFO L93 Difference]: Finished difference Result 136 states and 240 transitions. [2020-07-21 16:16:06,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:06,112 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:06,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:06,114 INFO L225 Difference]: With dead ends: 136 [2020-07-21 16:16:06,114 INFO L226 Difference]: Without dead ends: 134 [2020-07-21 16:16:06,114 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 16:16:06,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-21 16:16:06,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96. [2020-07-21 16:16:06,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 16:16:06,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions. [2020-07-21 16:16:06,126 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21 [2020-07-21 16:16:06,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:06,137 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 168 transitions. [2020-07-21 16:16:06,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:06,138 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions. [2020-07-21 16:16:06,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:06,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:06,139 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 16:16:06,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:06,356 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:06,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:06,356 INFO L82 PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times [2020-07-21 16:16:06,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:06,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376745007] [2020-07-21 16:16:06,358 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 16:16:06,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:06,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:06,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:06,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:06,413 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 16:16:06,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:06,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376745007] [2020-07-21 16:16:06,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:06,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:06,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096765582] [2020-07-21 16:16:06,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:06,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:06,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:06,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:06,417 INFO L87 Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states. [2020-07-21 16:16:06,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:06,438 INFO L93 Difference]: Finished difference Result 224 states and 398 transitions. [2020-07-21 16:16:06,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:06,441 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:06,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:06,443 INFO L225 Difference]: With dead ends: 224 [2020-07-21 16:16:06,443 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 16:16:06,444 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 16:16:06,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 16:16:06,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2020-07-21 16:16:06,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-21 16:16:06,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions. [2020-07-21 16:16:06,464 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21 [2020-07-21 16:16:06,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:06,466 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 234 transitions. [2020-07-21 16:16:06,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:06,466 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions. [2020-07-21 16:16:06,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:06,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:06,468 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 16:16:06,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:06,676 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:06,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:06,678 INFO L82 PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times [2020-07-21 16:16:06,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:06,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209855213] [2020-07-21 16:16:06,679 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 16:16:06,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:06,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:06,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:06,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:06,741 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 16:16:06,741 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:06,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209855213] [2020-07-21 16:16:06,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:06,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:06,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459937216] [2020-07-21 16:16:06,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:06,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:06,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:06,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:06,744 INFO L87 Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states. [2020-07-21 16:16:06,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:06,765 INFO L93 Difference]: Finished difference Result 201 states and 349 transitions. [2020-07-21 16:16:06,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:06,766 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:06,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:06,768 INFO L225 Difference]: With dead ends: 201 [2020-07-21 16:16:06,768 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 16:16:06,769 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 16:16:06,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 16:16:06,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 16:16:06,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 16:16:06,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions. [2020-07-21 16:16:06,778 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22 [2020-07-21 16:16:06,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:06,779 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 234 transitions. [2020-07-21 16:16:06,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:06,779 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions. [2020-07-21 16:16:06,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:06,780 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:06,780 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 16:16:06,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:06,995 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:06,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:06,995 INFO L82 PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times [2020-07-21 16:16:06,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:06,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784257684] [2020-07-21 16:16:06,996 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 16:16:07,051 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:07,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:07,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:07,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:07,074 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 16:16:07,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:07,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784257684] [2020-07-21 16:16:07,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:07,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:07,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865355618] [2020-07-21 16:16:07,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:07,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:07,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:07,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:07,077 INFO L87 Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states. [2020-07-21 16:16:07,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:07,108 INFO L93 Difference]: Finished difference Result 252 states and 440 transitions. [2020-07-21 16:16:07,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:07,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:07,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:07,110 INFO L225 Difference]: With dead ends: 252 [2020-07-21 16:16:07,110 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 16:16:07,111 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 16:16:07,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 16:16:07,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184. [2020-07-21 16:16:07,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 16:16:07,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions. [2020-07-21 16:16:07,135 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22 [2020-07-21 16:16:07,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:07,135 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 314 transitions. [2020-07-21 16:16:07,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:07,136 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions. [2020-07-21 16:16:07,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:07,137 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:07,137 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 16:16:07,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:07,352 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:07,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:07,353 INFO L82 PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times [2020-07-21 16:16:07,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:07,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411806584] [2020-07-21 16:16:07,354 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 16:16:07,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:07,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:07,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:07,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:07,414 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 16:16:07,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:07,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411806584] [2020-07-21 16:16:07,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:07,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:07,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120715302] [2020-07-21 16:16:07,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:07,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:07,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:07,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:07,417 INFO L87 Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states. [2020-07-21 16:16:07,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:07,435 INFO L93 Difference]: Finished difference Result 432 states and 744 transitions. [2020-07-21 16:16:07,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:07,436 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:07,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:07,438 INFO L225 Difference]: With dead ends: 432 [2020-07-21 16:16:07,438 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 16:16:07,439 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 16:16:07,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 16:16:07,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 16:16:07,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 16:16:07,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions. [2020-07-21 16:16:07,453 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22 [2020-07-21 16:16:07,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:07,454 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 434 transitions. [2020-07-21 16:16:07,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:07,454 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions. [2020-07-21 16:16:07,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:07,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:07,456 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 16:16:07,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:07,672 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:07,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:07,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times [2020-07-21 16:16:07,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:07,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810627474] [2020-07-21 16:16:07,674 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 16:16:07,708 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:07,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:07,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:07,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:07,723 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 16:16:07,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:07,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810627474] [2020-07-21 16:16:07,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:07,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:07,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590467131] [2020-07-21 16:16:07,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:07,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:07,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:07,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:07,725 INFO L87 Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states. [2020-07-21 16:16:07,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:07,747 INFO L93 Difference]: Finished difference Result 384 states and 648 transitions. [2020-07-21 16:16:07,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:07,747 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:07,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:07,749 INFO L225 Difference]: With dead ends: 384 [2020-07-21 16:16:07,749 INFO L226 Difference]: Without dead ends: 262 [2020-07-21 16:16:07,750 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 16:16:07,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-21 16:16:07,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 260. [2020-07-21 16:16:07,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 16:16:07,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 434 transitions. [2020-07-21 16:16:07,761 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 434 transitions. Word has length 23 [2020-07-21 16:16:07,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:07,761 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 434 transitions. [2020-07-21 16:16:07,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:07,761 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 434 transitions. [2020-07-21 16:16:07,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:07,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:07,763 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 16:16:07,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:07,978 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:07,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:07,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1385664132, now seen corresponding path program 1 times [2020-07-21 16:16:07,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:07,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606817813] [2020-07-21 16:16:07,981 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 16:16:08,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:08,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:08,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:08,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:08,031 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 16:16:08,031 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:08,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606817813] [2020-07-21 16:16:08,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:08,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:08,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722879931] [2020-07-21 16:16:08,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:08,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:08,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:08,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:08,034 INFO L87 Difference]: Start difference. First operand 260 states and 434 transitions. Second operand 3 states. [2020-07-21 16:16:08,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:08,054 INFO L93 Difference]: Finished difference Result 476 states and 808 transitions. [2020-07-21 16:16:08,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:08,059 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:08,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:08,061 INFO L225 Difference]: With dead ends: 476 [2020-07-21 16:16:08,061 INFO L226 Difference]: Without dead ends: 474 [2020-07-21 16:16:08,062 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 16:16:08,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2020-07-21 16:16:08,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 360. [2020-07-21 16:16:08,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 16:16:08,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions. [2020-07-21 16:16:08,078 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23 [2020-07-21 16:16:08,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:08,078 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 590 transitions. [2020-07-21 16:16:08,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:08,079 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions. [2020-07-21 16:16:08,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:08,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:08,081 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 16:16:08,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:08,297 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:08,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:08,298 INFO L82 PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times [2020-07-21 16:16:08,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:08,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455575287] [2020-07-21 16:16:08,298 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 16:16:08,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:08,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:08,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:08,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:08,355 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 16:16:08,356 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:08,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455575287] [2020-07-21 16:16:08,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:08,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:08,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80777281] [2020-07-21 16:16:08,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:08,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:08,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:08,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:08,358 INFO L87 Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states. [2020-07-21 16:16:08,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:08,400 INFO L93 Difference]: Finished difference Result 844 states and 1392 transitions. [2020-07-21 16:16:08,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:08,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:08,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:08,405 INFO L225 Difference]: With dead ends: 844 [2020-07-21 16:16:08,406 INFO L226 Difference]: Without dead ends: 498 [2020-07-21 16:16:08,407 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 16:16:08,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2020-07-21 16:16:08,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496. [2020-07-21 16:16:08,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 496 states. [2020-07-21 16:16:08,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions. [2020-07-21 16:16:08,426 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23 [2020-07-21 16:16:08,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:08,426 INFO L479 AbstractCegarLoop]: Abstraction has 496 states and 806 transitions. [2020-07-21 16:16:08,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:08,427 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions. [2020-07-21 16:16:08,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:08,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:08,428 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 16:16:08,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:08,643 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:08,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:08,644 INFO L82 PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times [2020-07-21 16:16:08,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:08,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084688404] [2020-07-21 16:16:08,645 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 16:16:08,691 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:08,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:08,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:08,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:08,716 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 16:16:08,717 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:08,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084688404] [2020-07-21 16:16:08,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:08,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:08,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417902066] [2020-07-21 16:16:08,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:08,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:08,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:08,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:08,719 INFO L87 Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states. [2020-07-21 16:16:08,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:08,740 INFO L93 Difference]: Finished difference Result 744 states and 1204 transitions. [2020-07-21 16:16:08,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:08,741 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:08,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:08,744 INFO L225 Difference]: With dead ends: 744 [2020-07-21 16:16:08,744 INFO L226 Difference]: Without dead ends: 506 [2020-07-21 16:16:08,745 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 16:16:08,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2020-07-21 16:16:08,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 504. [2020-07-21 16:16:08,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 504 states. [2020-07-21 16:16:08,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 806 transitions. [2020-07-21 16:16:08,763 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 806 transitions. Word has length 24 [2020-07-21 16:16:08,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:08,763 INFO L479 AbstractCegarLoop]: Abstraction has 504 states and 806 transitions. [2020-07-21 16:16:08,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:08,763 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 806 transitions. [2020-07-21 16:16:08,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:08,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:08,765 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 16:16:08,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:08,980 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:08,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:08,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1004987715, now seen corresponding path program 1 times [2020-07-21 16:16:08,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:08,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185029928] [2020-07-21 16:16:08,981 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 16:16:09,015 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:09,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:09,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:09,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:09,025 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 16:16:09,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:09,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185029928] [2020-07-21 16:16:09,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:09,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:09,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576958811] [2020-07-21 16:16:09,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:09,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:09,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:09,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:09,028 INFO L87 Difference]: Start difference. First operand 504 states and 806 transitions. Second operand 3 states. [2020-07-21 16:16:09,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:09,053 INFO L93 Difference]: Finished difference Result 908 states and 1480 transitions. [2020-07-21 16:16:09,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:09,054 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:09,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:09,059 INFO L225 Difference]: With dead ends: 908 [2020-07-21 16:16:09,059 INFO L226 Difference]: Without dead ends: 906 [2020-07-21 16:16:09,060 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 16:16:09,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 906 states. [2020-07-21 16:16:09,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 906 to 712. [2020-07-21 16:16:09,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 712 states. [2020-07-21 16:16:09,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 1110 transitions. [2020-07-21 16:16:09,081 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 1110 transitions. Word has length 24 [2020-07-21 16:16:09,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:09,082 INFO L479 AbstractCegarLoop]: Abstraction has 712 states and 1110 transitions. [2020-07-21 16:16:09,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:09,082 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 1110 transitions. [2020-07-21 16:16:09,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:09,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:09,083 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 16:16:09,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:09,297 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:09,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:09,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1591793729, now seen corresponding path program 1 times [2020-07-21 16:16:09,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:09,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388150242] [2020-07-21 16:16:09,299 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 16:16:09,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:09,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:09,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:09,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:09,350 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 16:16:09,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:09,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388150242] [2020-07-21 16:16:09,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:09,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:09,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429923946] [2020-07-21 16:16:09,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:09,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:09,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:09,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:09,352 INFO L87 Difference]: Start difference. First operand 712 states and 1110 transitions. Second operand 3 states. [2020-07-21 16:16:09,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:09,384 INFO L93 Difference]: Finished difference Result 1660 states and 2600 transitions. [2020-07-21 16:16:09,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:09,385 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:09,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:09,391 INFO L225 Difference]: With dead ends: 1660 [2020-07-21 16:16:09,391 INFO L226 Difference]: Without dead ends: 970 [2020-07-21 16:16:09,394 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 16:16:09,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 970 states. [2020-07-21 16:16:09,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 970 to 968. [2020-07-21 16:16:09,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 968 states. [2020-07-21 16:16:09,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 968 states to 968 states and 1494 transitions. [2020-07-21 16:16:09,429 INFO L78 Accepts]: Start accepts. Automaton has 968 states and 1494 transitions. Word has length 24 [2020-07-21 16:16:09,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:09,429 INFO L479 AbstractCegarLoop]: Abstraction has 968 states and 1494 transitions. [2020-07-21 16:16:09,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:09,430 INFO L276 IsEmpty]: Start isEmpty. Operand 968 states and 1494 transitions. [2020-07-21 16:16:09,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:09,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:09,432 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 16:16:09,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:09,639 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:09,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:09,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1089633349, now seen corresponding path program 1 times [2020-07-21 16:16:09,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:09,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541734399] [2020-07-21 16:16:09,640 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 16:16:09,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:09,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:09,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:09,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:09,730 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 16:16:09,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:09,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541734399] [2020-07-21 16:16:09,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:09,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:09,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182855711] [2020-07-21 16:16:09,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:09,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:09,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:09,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:09,734 INFO L87 Difference]: Start difference. First operand 968 states and 1494 transitions. Second operand 3 states. [2020-07-21 16:16:09,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:09,770 INFO L93 Difference]: Finished difference Result 1452 states and 2232 transitions. [2020-07-21 16:16:09,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:09,770 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:09,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:09,777 INFO L225 Difference]: With dead ends: 1452 [2020-07-21 16:16:09,777 INFO L226 Difference]: Without dead ends: 986 [2020-07-21 16:16:09,781 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 16:16:09,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 986 states. [2020-07-21 16:16:09,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 986 to 984. [2020-07-21 16:16:09,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-21 16:16:09,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1494 transitions. [2020-07-21 16:16:09,826 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1494 transitions. Word has length 25 [2020-07-21 16:16:09,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:09,828 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1494 transitions. [2020-07-21 16:16:09,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:09,828 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1494 transitions. [2020-07-21 16:16:09,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:09,830 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:09,830 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 16:16:10,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:10,044 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:10,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:10,044 INFO L82 PathProgramCache]: Analyzing trace with hash -2100750599, now seen corresponding path program 1 times [2020-07-21 16:16:10,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:10,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1315566384] [2020-07-21 16:16:10,045 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 16:16:10,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:10,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:10,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:10,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:10,104 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 16:16:10,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:10,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1315566384] [2020-07-21 16:16:10,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:10,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:10,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510706389] [2020-07-21 16:16:10,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:10,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:10,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:10,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:10,110 INFO L87 Difference]: Start difference. First operand 984 states and 1494 transitions. Second operand 3 states. [2020-07-21 16:16:10,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:10,144 INFO L93 Difference]: Finished difference Result 1740 states and 2696 transitions. [2020-07-21 16:16:10,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:10,145 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:10,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:10,153 INFO L225 Difference]: With dead ends: 1740 [2020-07-21 16:16:10,153 INFO L226 Difference]: Without dead ends: 1738 [2020-07-21 16:16:10,155 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 16:16:10,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1738 states. [2020-07-21 16:16:10,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1738 to 1416. [2020-07-21 16:16:10,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1416 states. [2020-07-21 16:16:10,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1416 states to 1416 states and 2086 transitions. [2020-07-21 16:16:10,197 INFO L78 Accepts]: Start accepts. Automaton has 1416 states and 2086 transitions. Word has length 25 [2020-07-21 16:16:10,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:10,197 INFO L479 AbstractCegarLoop]: Abstraction has 1416 states and 2086 transitions. [2020-07-21 16:16:10,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:10,197 INFO L276 IsEmpty]: Start isEmpty. Operand 1416 states and 2086 transitions. [2020-07-21 16:16:10,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:10,200 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:10,201 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 16:16:10,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:10,415 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:10,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:10,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1607410683, now seen corresponding path program 1 times [2020-07-21 16:16:10,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:10,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389440437] [2020-07-21 16:16:10,416 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 16:16:10,466 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:10,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:10,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:10,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:10,485 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 16:16:10,485 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:10,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389440437] [2020-07-21 16:16:10,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:10,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:10,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403049015] [2020-07-21 16:16:10,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:10,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:10,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:10,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:10,487 INFO L87 Difference]: Start difference. First operand 1416 states and 2086 transitions. Second operand 3 states. [2020-07-21 16:16:10,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:10,548 INFO L93 Difference]: Finished difference Result 3276 states and 4840 transitions. [2020-07-21 16:16:10,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:10,549 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:10,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:10,557 INFO L225 Difference]: With dead ends: 3276 [2020-07-21 16:16:10,557 INFO L226 Difference]: Without dead ends: 1898 [2020-07-21 16:16:10,561 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 16:16:10,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1898 states. [2020-07-21 16:16:10,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1898 to 1896. [2020-07-21 16:16:10,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1896 states. [2020-07-21 16:16:10,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2758 transitions. [2020-07-21 16:16:10,614 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2758 transitions. Word has length 25 [2020-07-21 16:16:10,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:10,614 INFO L479 AbstractCegarLoop]: Abstraction has 1896 states and 2758 transitions. [2020-07-21 16:16:10,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:10,614 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2758 transitions. [2020-07-21 16:16:10,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:10,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:10,618 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 16:16:10,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:10,831 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:10,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:10,832 INFO L82 PathProgramCache]: Analyzing trace with hash -698544044, now seen corresponding path program 1 times [2020-07-21 16:16:10,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:10,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395568302] [2020-07-21 16:16:10,834 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 16:16:10,865 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:10,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:10,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:10,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:10,880 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 16:16:10,881 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:10,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395568302] [2020-07-21 16:16:10,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:10,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:10,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264626430] [2020-07-21 16:16:10,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:10,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:10,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:10,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:10,883 INFO L87 Difference]: Start difference. First operand 1896 states and 2758 transitions. Second operand 3 states. [2020-07-21 16:16:10,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:10,930 INFO L93 Difference]: Finished difference Result 2844 states and 4120 transitions. [2020-07-21 16:16:10,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:10,931 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:10,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:10,941 INFO L225 Difference]: With dead ends: 2844 [2020-07-21 16:16:10,942 INFO L226 Difference]: Without dead ends: 1930 [2020-07-21 16:16:10,944 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 16:16:10,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-21 16:16:10,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1928. [2020-07-21 16:16:10,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1928 states. [2020-07-21 16:16:11,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1928 states to 1928 states and 2758 transitions. [2020-07-21 16:16:11,001 INFO L78 Accepts]: Start accepts. Automaton has 1928 states and 2758 transitions. Word has length 26 [2020-07-21 16:16:11,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:11,001 INFO L479 AbstractCegarLoop]: Abstraction has 1928 states and 2758 transitions. [2020-07-21 16:16:11,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:11,002 INFO L276 IsEmpty]: Start isEmpty. Operand 1928 states and 2758 transitions. [2020-07-21 16:16:11,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:11,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:11,004 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 16:16:11,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:11,220 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:11,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:11,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1709661294, now seen corresponding path program 1 times [2020-07-21 16:16:11,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:11,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083483227] [2020-07-21 16:16:11,221 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 16:16:11,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:11,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:11,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:11,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:11,266 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 16:16:11,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:11,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083483227] [2020-07-21 16:16:11,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:11,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:11,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575596540] [2020-07-21 16:16:11,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:11,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:11,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:11,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:11,269 INFO L87 Difference]: Start difference. First operand 1928 states and 2758 transitions. Second operand 3 states. [2020-07-21 16:16:11,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:11,322 INFO L93 Difference]: Finished difference Result 3340 states and 4872 transitions. [2020-07-21 16:16:11,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:11,323 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:11,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:11,337 INFO L225 Difference]: With dead ends: 3340 [2020-07-21 16:16:11,338 INFO L226 Difference]: Without dead ends: 3338 [2020-07-21 16:16:11,341 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 16:16:11,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3338 states. [2020-07-21 16:16:11,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3338 to 2824. [2020-07-21 16:16:11,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2824 states. [2020-07-21 16:16:11,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2824 states to 2824 states and 3910 transitions. [2020-07-21 16:16:11,417 INFO L78 Accepts]: Start accepts. Automaton has 2824 states and 3910 transitions. Word has length 26 [2020-07-21 16:16:11,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:11,417 INFO L479 AbstractCegarLoop]: Abstraction has 2824 states and 3910 transitions. [2020-07-21 16:16:11,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:11,417 INFO L276 IsEmpty]: Start isEmpty. Operand 2824 states and 3910 transitions. [2020-07-21 16:16:11,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:16:11,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:11,422 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 16:16:11,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:11,635 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:11,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:11,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1998499988, now seen corresponding path program 1 times [2020-07-21 16:16:11,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:11,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891486800] [2020-07-21 16:16:11,635 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 16:16:11,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:11,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:11,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:11,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:11,696 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 16:16:11,696 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:11,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891486800] [2020-07-21 16:16:11,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:11,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:11,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495952922] [2020-07-21 16:16:11,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:11,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:11,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:11,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:11,700 INFO L87 Difference]: Start difference. First operand 2824 states and 3910 transitions. Second operand 3 states. [2020-07-21 16:16:11,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:11,761 INFO L93 Difference]: Finished difference Result 6476 states and 8968 transitions. [2020-07-21 16:16:11,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:11,761 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 16:16:11,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:11,777 INFO L225 Difference]: With dead ends: 6476 [2020-07-21 16:16:11,778 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 16:16:11,783 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 16:16:11,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 16:16:11,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720. [2020-07-21 16:16:11,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3720 states. [2020-07-21 16:16:11,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions. [2020-07-21 16:16:11,883 INFO L78 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 26 [2020-07-21 16:16:11,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:11,883 INFO L479 AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions. [2020-07-21 16:16:11,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:11,883 INFO L276 IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions. [2020-07-21 16:16:11,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:11,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:11,888 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 16:16:12,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:12,103 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:12,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:12,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times [2020-07-21 16:16:12,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:12,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248765598] [2020-07-21 16:16:12,103 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 16:16:12,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:12,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:12,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:12,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:12,150 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 16:16:12,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:12,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248765598] [2020-07-21 16:16:12,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:12,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:12,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561967071] [2020-07-21 16:16:12,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:12,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:12,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:12,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:12,152 INFO L87 Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states. [2020-07-21 16:16:12,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:12,208 INFO L93 Difference]: Finished difference Result 5580 states and 7560 transitions. [2020-07-21 16:16:12,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:12,209 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:12,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:12,226 INFO L225 Difference]: With dead ends: 5580 [2020-07-21 16:16:12,226 INFO L226 Difference]: Without dead ends: 3786 [2020-07-21 16:16:12,230 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 16:16:12,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3786 states. [2020-07-21 16:16:12,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3786 to 3784. [2020-07-21 16:16:12,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3784 states. [2020-07-21 16:16:12,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3784 states to 3784 states and 5062 transitions. [2020-07-21 16:16:12,342 INFO L78 Accepts]: Start accepts. Automaton has 3784 states and 5062 transitions. Word has length 27 [2020-07-21 16:16:12,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:12,343 INFO L479 AbstractCegarLoop]: Abstraction has 3784 states and 5062 transitions. [2020-07-21 16:16:12,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:12,345 INFO L276 IsEmpty]: Start isEmpty. Operand 3784 states and 5062 transitions. [2020-07-21 16:16:12,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:12,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:12,351 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 16:16:12,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:12,564 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:12,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:12,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1824172910, now seen corresponding path program 1 times [2020-07-21 16:16:12,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:12,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298898459] [2020-07-21 16:16:12,565 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 16:16:12,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:12,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:12,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:12,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:12,613 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 16:16:12,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:12,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298898459] [2020-07-21 16:16:12,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:12,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:12,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468489445] [2020-07-21 16:16:12,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:12,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:12,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:12,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:12,616 INFO L87 Difference]: Start difference. First operand 3784 states and 5062 transitions. Second operand 3 states. [2020-07-21 16:16:12,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:12,758 INFO L93 Difference]: Finished difference Result 10956 states and 14408 transitions. [2020-07-21 16:16:12,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:12,759 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:12,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:12,798 INFO L225 Difference]: With dead ends: 10956 [2020-07-21 16:16:12,798 INFO L226 Difference]: Without dead ends: 7306 [2020-07-21 16:16:12,807 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 16:16:12,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7306 states. [2020-07-21 16:16:12,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7306 to 7304. [2020-07-21 16:16:12,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 16:16:12,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9350 transitions. [2020-07-21 16:16:12,973 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9350 transitions. Word has length 27 [2020-07-21 16:16:12,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:12,973 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9350 transitions. [2020-07-21 16:16:12,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:12,974 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9350 transitions. [2020-07-21 16:16:12,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:16:12,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:12,983 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 16:16:13,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:13,197 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:13,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:13,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1883988372, now seen corresponding path program 1 times [2020-07-21 16:16:13,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:13,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697425225] [2020-07-21 16:16:13,198 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 16:16:13,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:13,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:13,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:13,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:13,237 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 16:16:13,237 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:13,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697425225] [2020-07-21 16:16:13,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:13,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:13,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856492940] [2020-07-21 16:16:13,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:13,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:13,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:13,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,241 INFO L87 Difference]: Start difference. First operand 7304 states and 9350 transitions. Second operand 3 states. [2020-07-21 16:16:13,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:13,342 INFO L93 Difference]: Finished difference Result 8076 states and 10632 transitions. [2020-07-21 16:16:13,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:13,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 16:16:13,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:13,356 INFO L225 Difference]: With dead ends: 8076 [2020-07-21 16:16:13,357 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 16:16:13,359 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 16:16:13,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 16:16:13,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 7304. [2020-07-21 16:16:13,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7304 states. [2020-07-21 16:16:13,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7304 states to 7304 states and 9222 transitions. [2020-07-21 16:16:13,540 INFO L78 Accepts]: Start accepts. Automaton has 7304 states and 9222 transitions. Word has length 27 [2020-07-21 16:16:13,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:13,540 INFO L479 AbstractCegarLoop]: Abstraction has 7304 states and 9222 transitions. [2020-07-21 16:16:13,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:13,541 INFO L276 IsEmpty]: Start isEmpty. Operand 7304 states and 9222 transitions. [2020-07-21 16:16:13,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:16:13,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:13,550 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 16:16:13,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:13,764 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:13,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:13,764 INFO L82 PathProgramCache]: Analyzing trace with hash 715001129, now seen corresponding path program 1 times [2020-07-21 16:16:13,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:13,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118450566] [2020-07-21 16:16:13,765 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 16:16:13,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:13,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:13,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:13,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:13,811 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 16:16:13,811 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:13,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118450566] [2020-07-21 16:16:13,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:13,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:13,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460026043] [2020-07-21 16:16:13,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:13,812 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:13,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:13,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:13,813 INFO L87 Difference]: Start difference. First operand 7304 states and 9222 transitions. Second operand 3 states. [2020-07-21 16:16:13,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:13,949 INFO L93 Difference]: Finished difference Result 12172 states and 15496 transitions. [2020-07-21 16:16:13,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:13,950 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:16:13,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:13,969 INFO L225 Difference]: With dead ends: 12172 [2020-07-21 16:16:13,970 INFO L226 Difference]: Without dead ends: 12170 [2020-07-21 16:16:13,974 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 16:16:13,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12170 states. [2020-07-21 16:16:14,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12170 to 11144. [2020-07-21 16:16:14,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11144 states. [2020-07-21 16:16:14,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11144 states to 11144 states and 13702 transitions. [2020-07-21 16:16:14,224 INFO L78 Accepts]: Start accepts. Automaton has 11144 states and 13702 transitions. Word has length 28 [2020-07-21 16:16:14,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:14,224 INFO L479 AbstractCegarLoop]: Abstraction has 11144 states and 13702 transitions. [2020-07-21 16:16:14,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:14,224 INFO L276 IsEmpty]: Start isEmpty. Operand 11144 states and 13702 transitions. [2020-07-21 16:16:14,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 16:16:14,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:14,241 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 16:16:14,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:14,455 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:14,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:14,455 INFO L82 PathProgramCache]: Analyzing trace with hash 128195115, now seen corresponding path program 1 times [2020-07-21 16:16:14,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:14,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418876379] [2020-07-21 16:16:14,456 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 16:16:14,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:14,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:14,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:14,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:14,496 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 16:16:14,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:14,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418876379] [2020-07-21 16:16:14,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:14,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:14,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454166107] [2020-07-21 16:16:14,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:14,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:14,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:14,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:14,499 INFO L87 Difference]: Start difference. First operand 11144 states and 13702 transitions. Second operand 3 states. [2020-07-21 16:16:14,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:14,670 INFO L93 Difference]: Finished difference Result 25228 states and 30856 transitions. [2020-07-21 16:16:14,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:14,670 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 16:16:14,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:14,695 INFO L225 Difference]: With dead ends: 25228 [2020-07-21 16:16:14,695 INFO L226 Difference]: Without dead ends: 14218 [2020-07-21 16:16:14,720 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 16:16:14,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14218 states. [2020-07-21 16:16:15,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14218 to 14216. [2020-07-21 16:16:15,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14216 states. [2020-07-21 16:16:15,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14216 states to 14216 states and 16902 transitions. [2020-07-21 16:16:15,057 INFO L78 Accepts]: Start accepts. Automaton has 14216 states and 16902 transitions. Word has length 28 [2020-07-21 16:16:15,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:15,057 INFO L479 AbstractCegarLoop]: Abstraction has 14216 states and 16902 transitions. [2020-07-21 16:16:15,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:15,057 INFO L276 IsEmpty]: Start isEmpty. Operand 14216 states and 16902 transitions. [2020-07-21 16:16:15,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:16:15,074 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:15,074 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 16:16:15,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:15,289 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:15,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:15,289 INFO L82 PathProgramCache]: Analyzing trace with hash 690414627, now seen corresponding path program 1 times [2020-07-21 16:16:15,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:15,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [552321566] [2020-07-21 16:16:15,290 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 16:16:15,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:15,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:15,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:15,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:15,334 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 16:16:15,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:15,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [552321566] [2020-07-21 16:16:15,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:15,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:15,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940981580] [2020-07-21 16:16:15,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:15,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:15,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:15,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:15,336 INFO L87 Difference]: Start difference. First operand 14216 states and 16902 transitions. Second operand 3 states. [2020-07-21 16:16:15,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:15,472 INFO L93 Difference]: Finished difference Result 21516 states and 25608 transitions. [2020-07-21 16:16:15,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:15,472 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 16:16:15,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:15,497 INFO L225 Difference]: With dead ends: 21516 [2020-07-21 16:16:15,498 INFO L226 Difference]: Without dead ends: 14602 [2020-07-21 16:16:15,514 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 16:16:15,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14602 states. [2020-07-21 16:16:16,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14602 to 14600. [2020-07-21 16:16:16,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14600 states. [2020-07-21 16:16:16,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14600 states to 14600 states and 17158 transitions. [2020-07-21 16:16:16,277 INFO L78 Accepts]: Start accepts. Automaton has 14600 states and 17158 transitions. Word has length 29 [2020-07-21 16:16:16,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:16,277 INFO L479 AbstractCegarLoop]: Abstraction has 14600 states and 17158 transitions. [2020-07-21 16:16:16,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:16,277 INFO L276 IsEmpty]: Start isEmpty. Operand 14600 states and 17158 transitions. [2020-07-21 16:16:16,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:16:16,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:16,294 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 16:16:16,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:16,509 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:16,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:16,509 INFO L82 PathProgramCache]: Analyzing trace with hash -320702623, now seen corresponding path program 1 times [2020-07-21 16:16:16,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:16,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714505446] [2020-07-21 16:16:16,509 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 16:16:16,543 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:16,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:16,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:16,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:16,551 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 16:16:16,551 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:16,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714505446] [2020-07-21 16:16:16,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:16,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:16,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565635496] [2020-07-21 16:16:16,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:16,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:16,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:16,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:16,553 INFO L87 Difference]: Start difference. First operand 14600 states and 17158 transitions. Second operand 3 states. [2020-07-21 16:16:16,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:16,734 INFO L93 Difference]: Finished difference Result 23562 states and 27399 transitions. [2020-07-21 16:16:16,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:16,735 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 16:16:16,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:16,766 INFO L225 Difference]: With dead ends: 23562 [2020-07-21 16:16:16,766 INFO L226 Difference]: Without dead ends: 23560 [2020-07-21 16:16:16,776 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 16:16:16,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23560 states. [2020-07-21 16:16:17,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23560 to 22536. [2020-07-21 16:16:17,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22536 states. [2020-07-21 16:16:17,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22536 states to 22536 states and 25862 transitions. [2020-07-21 16:16:17,164 INFO L78 Accepts]: Start accepts. Automaton has 22536 states and 25862 transitions. Word has length 29 [2020-07-21 16:16:17,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:17,164 INFO L479 AbstractCegarLoop]: Abstraction has 22536 states and 25862 transitions. [2020-07-21 16:16:17,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:17,165 INFO L276 IsEmpty]: Start isEmpty. Operand 22536 states and 25862 transitions. [2020-07-21 16:16:17,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:16:17,190 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:17,191 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 16:16:17,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:17,404 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:17,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:17,405 INFO L82 PathProgramCache]: Analyzing trace with hash -907508637, now seen corresponding path program 1 times [2020-07-21 16:16:17,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:17,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145339898] [2020-07-21 16:16:17,406 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 16:16:17,434 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:17,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:17,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:17,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:17,442 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 16:16:17,443 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:17,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145339898] [2020-07-21 16:16:17,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:17,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:17,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804222517] [2020-07-21 16:16:17,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:17,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:17,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:17,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:17,446 INFO L87 Difference]: Start difference. First operand 22536 states and 25862 transitions. Second operand 3 states. [2020-07-21 16:16:17,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:17,768 INFO L93 Difference]: Finished difference Result 50184 states and 56582 transitions. [2020-07-21 16:16:17,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:17,769 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 16:16:17,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:17,769 INFO L225 Difference]: With dead ends: 50184 [2020-07-21 16:16:17,769 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:16:17,821 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 16:16:17,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:16:17,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:16:17,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:16:17,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:16:17,823 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2020-07-21 16:16:17,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:17,823 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:16:17,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:17,823 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:16:17,823 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:16:18,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:18,041 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:16:18,088 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:16:18,088 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:18,088 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:18,089 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:16:18,089 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:16:18,089 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:16:18,089 INFO L271 CegarLoopResult]: At program point L159(lines 5 163) the Hoare annotation is: true [2020-07-21 16:16:18,089 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 163) no Hoare annotation was computed. [2020-07-21 16:16:18,089 INFO L268 CegarLoopResult]: For program point L118-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,089 INFO L268 CegarLoopResult]: For program point L143-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L102-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L94-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L119(line 119) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L86-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L144(line 144) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L78-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L70-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L268 CegarLoopResult]: For program point L128-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,090 INFO L271 CegarLoopResult]: At program point L153-1(lines 39 158) the Hoare annotation is: true [2020-07-21 16:16:18,091 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 163) no Hoare annotation was computed. [2020-07-21 16:16:18,091 INFO L268 CegarLoopResult]: For program point L129(line 129) no Hoare annotation was computed. [2020-07-21 16:16:18,091 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161) no Hoare annotation was computed. [2020-07-21 16:16:18,091 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 163) the Hoare annotation is: true [2020-07-21 16:16:18,091 INFO L268 CegarLoopResult]: For program point L154(line 154) no Hoare annotation was computed. [2020-07-21 16:16:18,091 INFO L264 CegarLoopResult]: At program point L154-1(lines 5 163) the Hoare annotation is: false [2020-07-21 16:16:18,091 INFO L268 CegarLoopResult]: For program point L113-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L138-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L114(line 114) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L139(line 139) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L98-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L123-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L90-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L148-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L82-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 16:16:18,092 INFO L268 CegarLoopResult]: For program point L74-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L66(lines 66 68) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L66-2(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L124(line 124) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L149(line 149) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L108-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L133-1(lines 39 158) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L109(line 109) no Hoare annotation was computed. [2020-07-21 16:16:18,093 INFO L268 CegarLoopResult]: For program point L134(line 134) no Hoare annotation was computed. [2020-07-21 16:16:18,104 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:16:18 BoogieIcfgContainer [2020-07-21 16:16:18,105 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:16:18,107 INFO L168 Benchmark]: Toolchain (without parser) took 14390.58 ms. Allocated memory was 137.4 MB in the beginning and 563.1 MB in the end (delta: 425.7 MB). Free memory was 102.2 MB in the beginning and 387.9 MB in the end (delta: -285.7 MB). Peak memory consumption was 140.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,108 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,108 INFO L168 Benchmark]: CACSL2BoogieTranslator took 491.40 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 101.7 MB in the beginning and 181.4 MB in the end (delta: -79.7 MB). Peak memory consumption was 24.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,108 INFO L168 Benchmark]: Boogie Preprocessor took 61.28 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 179.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,109 INFO L168 Benchmark]: RCFGBuilder took 348.80 ms. Allocated memory is still 202.4 MB. Free memory was 179.0 MB in the beginning and 159.8 MB in the end (delta: 19.2 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,109 INFO L168 Benchmark]: TraceAbstraction took 13483.04 ms. Allocated memory was 202.4 MB in the beginning and 563.1 MB in the end (delta: 360.7 MB). Free memory was 159.1 MB in the beginning and 387.9 MB in the end (delta: -228.8 MB). Peak memory consumption was 132.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:18,111 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 491.40 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 101.7 MB in the beginning and 181.4 MB in the end (delta: -79.7 MB). Peak memory consumption was 24.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 61.28 ms. Allocated memory is still 202.4 MB. Free memory was 181.4 MB in the beginning and 179.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 348.80 ms. Allocated memory is still 202.4 MB. Free memory was 179.0 MB in the beginning and 159.8 MB in the end (delta: 19.2 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13483.04 ms. Allocated memory was 202.4 MB in the beginning and 563.1 MB in the end (delta: 360.7 MB). Free memory was 159.1 MB in the beginning and 387.9 MB in the end (delta: -228.8 MB). Peak memory consumption was 132.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 161]: 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: 39]: 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, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 13.3s, OverallIterations: 28, TraceHistogramMax: 1, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2384 SDtfs, 1153 SDslu, 1624 SDs, 0 SdLazy, 149 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 659 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22536occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 2.8s AutomataMinimizationTime, 28 MinimizatonAttempts, 4124 StatesRemovedByMinimization, 27 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 687 NumberOfCodeBlocks, 687 NumberOfCodeBlocksAsserted, 56 NumberOfCheckSat, 659 ConstructedInterpolants, 0 QuantifiedInterpolants, 31265 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3128 ConjunctsInSsa, 84 ConjunctsInUnsatCore, 28 InterpolantComputations, 28 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...