/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_5.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:16:20,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:16:20,407 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:16:20,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:16:20,419 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:16:20,420 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:16:20,422 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:16:20,424 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:16:20,425 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:16:20,426 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:16:20,427 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:16:20,428 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:16:20,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:16:20,429 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:16:20,430 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:16:20,432 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:16:20,432 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:16:20,433 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:16:20,435 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:16:20,437 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:16:20,439 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:16:20,440 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:16:20,441 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:16:20,442 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:16:20,445 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:16:20,453 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:16:20,453 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:16:20,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:16:20,455 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 16:16:20,470 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:16:20,470 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:16:20,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:16:20,472 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:16:20,472 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:16:20,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:16:20,472 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:16:20,473 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:16:20,473 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:16:20,473 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:16:20,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:16:20,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:16:20,474 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:16:20,474 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:16:20,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:16:20,474 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:16:20,474 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:16:20,475 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:16:20,475 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:16:20,475 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:16:20,475 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:16:20,475 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:20,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:16:20,476 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:16:20,476 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:16:20,476 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:16:20,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:20,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:16:20,477 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:16:20,477 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 16:16:20,797 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:16:20,811 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:16:20,815 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:16:20,816 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:16:20,817 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:16:20,817 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_5.c [2020-07-21 16:16:20,881 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dac12c008/88a5206533f2413ab67e63c4b3a36c51/FLAG239bc4f99 [2020-07-21 16:16:21,296 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:16:21,297 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_5.c [2020-07-21 16:16:21,308 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dac12c008/88a5206533f2413ab67e63c4b3a36c51/FLAG239bc4f99 [2020-07-21 16:16:21,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dac12c008/88a5206533f2413ab67e63c4b3a36c51 [2020-07-21 16:16:21,671 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:16:21,675 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:16:21,680 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:21,680 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:16:21,684 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:16:21,685 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,688 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1553bfc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21, skipping insertion in model container [2020-07-21 16:16:21,688 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,696 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:16:21,713 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:16:21,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:21,880 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:16:21,903 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:21,917 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:16:21,918 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21 WrapperNode [2020-07-21 16:16:21,918 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:21,919 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:16:21,919 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:16:21,919 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:16:21,929 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,929 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,935 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,935 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:21,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:22,023 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:22,024 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (1/1) ... [2020-07-21 16:16:22,027 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:16:22,027 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:16:22,027 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:16:22,028 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:16:22,028 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (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 16:16:22,089 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:16:22,090 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:16:22,090 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:16:22,090 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:16:22,090 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:16:22,091 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:16:22,091 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:16:22,091 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:16:22,310 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:16:22,311 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:16:22,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:22 BoogieIcfgContainer [2020-07-21 16:16:22,314 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:16:22,316 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:16:22,316 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:16:22,319 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:16:22,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:16:21" (1/3) ... [2020-07-21 16:16:22,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7da306f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:22, skipping insertion in model container [2020-07-21 16:16:22,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:21" (2/3) ... [2020-07-21 16:16:22,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7da306f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:22, skipping insertion in model container [2020-07-21 16:16:22,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:22" (3/3) ... [2020-07-21 16:16:22,323 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_5.c [2020-07-21 16:16:22,333 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:16:22,341 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:16:22,375 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:16:22,423 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:16:22,423 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:16:22,423 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:16:22,423 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:16:22,424 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:16:22,424 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:16:22,424 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:16:22,424 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:16:22,449 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-21 16:16:22,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 16:16:22,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:22,458 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:22,458 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:22,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:22,463 INFO L82 PathProgramCache]: Analyzing trace with hash 316328318, now seen corresponding path program 1 times [2020-07-21 16:16:22,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:22,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885929826] [2020-07-21 16:16:22,470 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 16:16:22,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:22,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:22,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:22,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:22,596 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 16:16:22,597 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:22,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885929826] [2020-07-21 16:16:22,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:22,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:22,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326942977] [2020-07-21 16:16:22,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:22,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:22,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:22,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:22,616 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-07-21 16:16:22,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:22,672 INFO L93 Difference]: Finished difference Result 57 states and 90 transitions. [2020-07-21 16:16:22,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:22,674 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 16:16:22,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:22,685 INFO L225 Difference]: With dead ends: 57 [2020-07-21 16:16:22,685 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:16:22,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 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 16:16:22,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:16:22,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 30. [2020-07-21 16:16:22,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:16:22,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 49 transitions. [2020-07-21 16:16:22,738 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 49 transitions. Word has length 15 [2020-07-21 16:16:22,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:22,739 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 49 transitions. [2020-07-21 16:16:22,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:22,739 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 49 transitions. [2020-07-21 16:16:22,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 16:16:22,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:22,741 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:22,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:22,958 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:22,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:22,959 INFO L82 PathProgramCache]: Analyzing trace with hash -493018308, now seen corresponding path program 1 times [2020-07-21 16:16:22,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:22,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95298006] [2020-07-21 16:16:22,961 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 16:16:23,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:23,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:23,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:23,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:23,026 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 16:16:23,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:23,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95298006] [2020-07-21 16:16:23,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:23,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:23,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347698320] [2020-07-21 16:16:23,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:23,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:23,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:23,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,031 INFO L87 Difference]: Start difference. First operand 30 states and 49 transitions. Second operand 3 states. [2020-07-21 16:16:23,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:23,066 INFO L93 Difference]: Finished difference Result 67 states and 112 transitions. [2020-07-21 16:16:23,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:23,068 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 16:16:23,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:23,071 INFO L225 Difference]: With dead ends: 67 [2020-07-21 16:16:23,072 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:16:23,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 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 16:16:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:16:23,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2020-07-21 16:16:23,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:16:23,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 65 transitions. [2020-07-21 16:16:23,088 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 65 transitions. Word has length 15 [2020-07-21 16:16:23,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:23,089 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 65 transitions. [2020-07-21 16:16:23,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:23,089 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 65 transitions. [2020-07-21 16:16:23,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:16:23,091 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:23,092 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:23,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,307 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:23,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:23,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1216458266, now seen corresponding path program 1 times [2020-07-21 16:16:23,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:23,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762274055] [2020-07-21 16:16:23,310 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 16:16:23,355 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:23,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:23,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:23,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:23,371 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 16:16:23,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:23,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762274055] [2020-07-21 16:16:23,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:23,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:23,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244557864] [2020-07-21 16:16:23,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:23,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:23,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:23,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,377 INFO L87 Difference]: Start difference. First operand 40 states and 65 transitions. Second operand 3 states. [2020-07-21 16:16:23,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:23,407 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:16:23,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:23,409 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 16:16:23,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:23,411 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:16:23,411 INFO L226 Difference]: Without dead ends: 45 [2020-07-21 16:16:23,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 16:16:23,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-21 16:16:23,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2020-07-21 16:16:23,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 16:16:23,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 67 transitions. [2020-07-21 16:16:23,427 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 67 transitions. Word has length 16 [2020-07-21 16:16:23,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:23,427 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 67 transitions. [2020-07-21 16:16:23,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:23,431 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 67 transitions. [2020-07-21 16:16:23,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:16:23,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:23,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:23,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,647 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:23,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:23,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1896516636, now seen corresponding path program 1 times [2020-07-21 16:16:23,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:23,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399119074] [2020-07-21 16:16:23,650 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 16:16:23,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:23,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:23,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:23,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:23,696 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 16:16:23,697 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:23,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399119074] [2020-07-21 16:16:23,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:23,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:23,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188875533] [2020-07-21 16:16:23,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:23,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:23,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:23,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:23,699 INFO L87 Difference]: Start difference. First operand 43 states and 67 transitions. Second operand 3 states. [2020-07-21 16:16:23,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:23,737 INFO L93 Difference]: Finished difference Result 76 states and 120 transitions. [2020-07-21 16:16:23,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:23,738 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 16:16:23,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:23,739 INFO L225 Difference]: With dead ends: 76 [2020-07-21 16:16:23,739 INFO L226 Difference]: Without dead ends: 74 [2020-07-21 16:16:23,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 16:16:23,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-21 16:16:23,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2020-07-21 16:16:23,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:16:23,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 88 transitions. [2020-07-21 16:16:23,750 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 88 transitions. Word has length 16 [2020-07-21 16:16:23,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:23,750 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 88 transitions. [2020-07-21 16:16:23,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:23,750 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 88 transitions. [2020-07-21 16:16:23,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:16:23,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:23,752 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:23,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,956 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:23,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:23,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1087170010, now seen corresponding path program 1 times [2020-07-21 16:16:23,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:23,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722151241] [2020-07-21 16:16:23,959 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 16:16:23,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:23,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:23,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:23,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:24,004 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 16:16:24,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:24,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722151241] [2020-07-21 16:16:24,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:24,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:24,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18217643] [2020-07-21 16:16:24,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:24,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:24,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:24,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,006 INFO L87 Difference]: Start difference. First operand 56 states and 88 transitions. Second operand 3 states. [2020-07-21 16:16:24,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:24,038 INFO L93 Difference]: Finished difference Result 124 states and 198 transitions. [2020-07-21 16:16:24,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:24,039 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 16:16:24,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:24,040 INFO L225 Difference]: With dead ends: 124 [2020-07-21 16:16:24,040 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:16:24,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 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 16:16:24,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:16:24,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2020-07-21 16:16:24,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-21 16:16:24,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 114 transitions. [2020-07-21 16:16:24,050 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 114 transitions. Word has length 16 [2020-07-21 16:16:24,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:24,051 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 114 transitions. [2020-07-21 16:16:24,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:24,051 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 114 transitions. [2020-07-21 16:16:24,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:24,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:24,052 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:24,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:24,260 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:24,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:24,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1337311087, now seen corresponding path program 1 times [2020-07-21 16:16:24,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:24,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972590794] [2020-07-21 16:16:24,262 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 16:16:24,297 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:24,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:24,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:24,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:24,307 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 16:16:24,307 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:24,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972590794] [2020-07-21 16:16:24,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:24,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:24,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663035407] [2020-07-21 16:16:24,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:24,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:24,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:24,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,310 INFO L87 Difference]: Start difference. First operand 74 states and 114 transitions. Second operand 3 states. [2020-07-21 16:16:24,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:24,334 INFO L93 Difference]: Finished difference Result 111 states and 169 transitions. [2020-07-21 16:16:24,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:24,334 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:24,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:24,335 INFO L225 Difference]: With dead ends: 111 [2020-07-21 16:16:24,335 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 16:16:24,336 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 16:16:24,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 16:16:24,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 16:16:24,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 16:16:24,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 114 transitions. [2020-07-21 16:16:24,351 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 114 transitions. Word has length 17 [2020-07-21 16:16:24,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:24,367 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 114 transitions. [2020-07-21 16:16:24,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:24,367 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 114 transitions. [2020-07-21 16:16:24,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:24,368 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:24,368 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:24,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:24,569 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:24,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:24,569 INFO L82 PathProgramCache]: Analyzing trace with hash -657252717, now seen corresponding path program 1 times [2020-07-21 16:16:24,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:24,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1315595140] [2020-07-21 16:16:24,570 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 16:16:24,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:24,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:24,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:24,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:24,619 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 16:16:24,621 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:24,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1315595140] [2020-07-21 16:16:24,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:24,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:24,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930464034] [2020-07-21 16:16:24,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:24,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:24,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:24,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,623 INFO L87 Difference]: Start difference. First operand 76 states and 114 transitions. Second operand 3 states. [2020-07-21 16:16:24,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:24,646 INFO L93 Difference]: Finished difference Result 132 states and 200 transitions. [2020-07-21 16:16:24,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:24,647 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:24,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:24,651 INFO L225 Difference]: With dead ends: 132 [2020-07-21 16:16:24,651 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 16:16:24,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 16:16:24,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 16:16:24,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 104. [2020-07-21 16:16:24,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 16:16:24,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 154 transitions. [2020-07-21 16:16:24,674 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 154 transitions. Word has length 17 [2020-07-21 16:16:24,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:24,674 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 154 transitions. [2020-07-21 16:16:24,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:24,674 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 154 transitions. [2020-07-21 16:16:24,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:24,677 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:24,678 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:24,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:24,891 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:24,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:24,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1466599343, now seen corresponding path program 1 times [2020-07-21 16:16:24,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:24,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138707680] [2020-07-21 16:16:24,893 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 16:16:24,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:24,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:24,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:24,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:24,936 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 16:16:24,937 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:24,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138707680] [2020-07-21 16:16:24,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:24,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:24,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754039074] [2020-07-21 16:16:24,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:24,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:24,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:24,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:24,939 INFO L87 Difference]: Start difference. First operand 104 states and 154 transitions. Second operand 3 states. [2020-07-21 16:16:24,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:24,965 INFO L93 Difference]: Finished difference Result 232 states and 344 transitions. [2020-07-21 16:16:24,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:24,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:24,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:24,967 INFO L225 Difference]: With dead ends: 232 [2020-07-21 16:16:24,967 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 16:16:24,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 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 16:16:24,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 16:16:24,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2020-07-21 16:16:24,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 16:16:24,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 194 transitions. [2020-07-21 16:16:24,980 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 194 transitions. Word has length 17 [2020-07-21 16:16:24,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:24,980 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 194 transitions. [2020-07-21 16:16:24,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:24,981 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 194 transitions. [2020-07-21 16:16:24,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:24,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:24,982 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:25,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,198 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1100217935, now seen corresponding path program 1 times [2020-07-21 16:16:25,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887088258] [2020-07-21 16:16:25,199 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 16:16:25,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,235 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 16:16:25,235 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887088258] [2020-07-21 16:16:25,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,236 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623973944] [2020-07-21 16:16:25,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,238 INFO L87 Difference]: Start difference. First operand 136 states and 194 transitions. Second operand 3 states. [2020-07-21 16:16:25,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,269 INFO L93 Difference]: Finished difference Result 204 states and 288 transitions. [2020-07-21 16:16:25,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,270 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:25,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,271 INFO L225 Difference]: With dead ends: 204 [2020-07-21 16:16:25,271 INFO L226 Difference]: Without dead ends: 142 [2020-07-21 16:16:25,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 16:16:25,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-21 16:16:25,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2020-07-21 16:16:25,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 16:16:25,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 194 transitions. [2020-07-21 16:16:25,282 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 194 transitions. Word has length 18 [2020-07-21 16:16:25,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,283 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 194 transitions. [2020-07-21 16:16:25,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,283 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 194 transitions. [2020-07-21 16:16:25,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:25,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,284 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:25,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,496 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1780276305, now seen corresponding path program 1 times [2020-07-21 16:16:25,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [415243988] [2020-07-21 16:16:25,499 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 16:16:25,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,551 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 16:16:25,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [415243988] [2020-07-21 16:16:25,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290982698] [2020-07-21 16:16:25,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,554 INFO L87 Difference]: Start difference. First operand 140 states and 194 transitions. Second operand 3 states. [2020-07-21 16:16:25,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,576 INFO L93 Difference]: Finished difference Result 236 states and 328 transitions. [2020-07-21 16:16:25,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,580 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:25,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,581 INFO L225 Difference]: With dead ends: 236 [2020-07-21 16:16:25,581 INFO L226 Difference]: Without dead ends: 234 [2020-07-21 16:16:25,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 16:16:25,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-21 16:16:25,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 200. [2020-07-21 16:16:25,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 16:16:25,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 270 transitions. [2020-07-21 16:16:25,594 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 270 transitions. Word has length 18 [2020-07-21 16:16:25,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,594 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 270 transitions. [2020-07-21 16:16:25,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,594 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 270 transitions. [2020-07-21 16:16:25,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:25,596 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,596 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:25,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,810 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,811 INFO L82 PathProgramCache]: Analyzing trace with hash 970929679, now seen corresponding path program 1 times [2020-07-21 16:16:25,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389164949] [2020-07-21 16:16:25,812 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 16:16:25,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,849 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 16:16:25,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389164949] [2020-07-21 16:16:25,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326798742] [2020-07-21 16:16:25,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,851 INFO L87 Difference]: Start difference. First operand 200 states and 270 transitions. Second operand 3 states. [2020-07-21 16:16:25,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,877 INFO L93 Difference]: Finished difference Result 444 states and 592 transitions. [2020-07-21 16:16:25,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,877 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:25,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,879 INFO L225 Difference]: With dead ends: 444 [2020-07-21 16:16:25,879 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 16:16:25,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 16:16:25,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 16:16:25,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2020-07-21 16:16:25,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 16:16:25,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 326 transitions. [2020-07-21 16:16:25,907 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 326 transitions. Word has length 18 [2020-07-21 16:16:25,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,907 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 326 transitions. [2020-07-21 16:16:25,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,908 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 326 transitions. [2020-07-21 16:16:25,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:25,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,913 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,114 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,115 INFO L82 PathProgramCache]: Analyzing trace with hash -645793370, now seen corresponding path program 1 times [2020-07-21 16:16:26,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814999823] [2020-07-21 16:16:26,116 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 16:16:26,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,149 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 16:16:26,149 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814999823] [2020-07-21 16:16:26,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750018087] [2020-07-21 16:16:26,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,151 INFO L87 Difference]: Start difference. First operand 256 states and 326 transitions. Second operand 3 states. [2020-07-21 16:16:26,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,172 INFO L93 Difference]: Finished difference Result 384 states and 484 transitions. [2020-07-21 16:16:26,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,173 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:26,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,175 INFO L225 Difference]: With dead ends: 384 [2020-07-21 16:16:26,175 INFO L226 Difference]: Without dead ends: 266 [2020-07-21 16:16:26,176 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 16:16:26,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-21 16:16:26,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 264. [2020-07-21 16:16:26,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 16:16:26,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 326 transitions. [2020-07-21 16:16:26,186 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 326 transitions. Word has length 19 [2020-07-21 16:16:26,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,186 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 326 transitions. [2020-07-21 16:16:26,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,187 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 326 transitions. [2020-07-21 16:16:26,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:26,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,188 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,400 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,401 INFO L82 PathProgramCache]: Analyzing trace with hash 34265000, now seen corresponding path program 1 times [2020-07-21 16:16:26,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044518319] [2020-07-21 16:16:26,402 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 16:16:26,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,441 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 16:16:26,441 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044518319] [2020-07-21 16:16:26,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499290856] [2020-07-21 16:16:26,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,443 INFO L87 Difference]: Start difference. First operand 264 states and 326 transitions. Second operand 3 states. [2020-07-21 16:16:26,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,475 INFO L93 Difference]: Finished difference Result 426 states and 519 transitions. [2020-07-21 16:16:26,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,476 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:26,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,478 INFO L225 Difference]: With dead ends: 426 [2020-07-21 16:16:26,478 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 16:16:26,479 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 16:16:26,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 16:16:26,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 392. [2020-07-21 16:16:26,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 16:16:26,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 470 transitions. [2020-07-21 16:16:26,491 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 470 transitions. Word has length 19 [2020-07-21 16:16:26,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,492 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 470 transitions. [2020-07-21 16:16:26,492 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,492 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 470 transitions. [2020-07-21 16:16:26,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:26,493 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,493 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,709 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,710 INFO L82 PathProgramCache]: Analyzing trace with hash -775081626, now seen corresponding path program 1 times [2020-07-21 16:16:26,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444443684] [2020-07-21 16:16:26,711 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 16:16:26,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,747 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 16:16:26,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444443684] [2020-07-21 16:16:26,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131718144] [2020-07-21 16:16:26,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,750 INFO L87 Difference]: Start difference. First operand 392 states and 470 transitions. Second operand 3 states. [2020-07-21 16:16:26,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,787 INFO L93 Difference]: Finished difference Result 856 states and 998 transitions. [2020-07-21 16:16:26,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,788 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:26,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,788 INFO L225 Difference]: With dead ends: 856 [2020-07-21 16:16:26,789 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:16:26,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 16:16:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:16:26,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:16:26,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:16:26,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:16:26,792 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 19 [2020-07-21 16:16:26,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,793 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:16:26,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,793 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:16:26,793 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:16:27,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,006 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:16:27,062 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:16:27,063 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:27,063 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:27,063 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:16:27,063 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:16:27,063 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:16:27,063 INFO L268 CegarLoopResult]: For program point L64(line 64) no Hoare annotation was computed. [2020-07-21 16:16:27,064 INFO L271 CegarLoopResult]: At program point L89(lines 5 93) the Hoare annotation is: true [2020-07-21 16:16:27,064 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 93) no Hoare annotation was computed. [2020-07-21 16:16:27,064 INFO L268 CegarLoopResult]: For program point L73-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,064 INFO L268 CegarLoopResult]: For program point L69(line 69) no Hoare annotation was computed. [2020-07-21 16:16:27,064 INFO L268 CegarLoopResult]: For program point L57-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,064 INFO L268 CegarLoopResult]: For program point L53-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L49-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L78-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L45-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L74(line 74) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L41(lines 41 43) no Hoare annotation was computed. [2020-07-21 16:16:27,065 INFO L268 CegarLoopResult]: For program point L41-2(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,066 INFO L271 CegarLoopResult]: At program point L83-1(lines 24 88) the Hoare annotation is: true [2020-07-21 16:16:27,066 INFO L268 CegarLoopResult]: For program point L79(line 79) no Hoare annotation was computed. [2020-07-21 16:16:27,066 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 93) no Hoare annotation was computed. [2020-07-21 16:16:27,066 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 91) no Hoare annotation was computed. [2020-07-21 16:16:27,066 INFO L268 CegarLoopResult]: For program point L63-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,066 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 93) the Hoare annotation is: true [2020-07-21 16:16:27,067 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 16:16:27,067 INFO L268 CegarLoopResult]: For program point L84(line 84) no Hoare annotation was computed. [2020-07-21 16:16:27,067 INFO L264 CegarLoopResult]: At program point L84-1(lines 5 93) the Hoare annotation is: false [2020-07-21 16:16:27,067 INFO L268 CegarLoopResult]: For program point L68-1(lines 24 88) no Hoare annotation was computed. [2020-07-21 16:16:27,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:16:27 BoogieIcfgContainer [2020-07-21 16:16:27,079 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:16:27,082 INFO L168 Benchmark]: Toolchain (without parser) took 5407.40 ms. Allocated memory was 143.7 MB in the beginning and 229.1 MB in the end (delta: 85.5 MB). Free memory was 100.0 MB in the beginning and 86.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 98.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,083 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,084 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.05 ms. Allocated memory is still 143.7 MB. Free memory was 99.6 MB in the beginning and 89.6 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,085 INFO L168 Benchmark]: Boogie Preprocessor took 108.19 ms. Allocated memory was 143.7 MB in the beginning and 199.2 MB in the end (delta: 55.6 MB). Free memory was 89.6 MB in the beginning and 178.3 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,086 INFO L168 Benchmark]: RCFGBuilder took 287.37 ms. Allocated memory is still 199.2 MB. Free memory was 178.3 MB in the beginning and 163.4 MB in the end (delta: 14.9 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,086 INFO L168 Benchmark]: TraceAbstraction took 4763.06 ms. Allocated memory was 199.2 MB in the beginning and 229.1 MB in the end (delta: 29.9 MB). Free memory was 162.7 MB in the beginning and 86.7 MB in the end (delta: 76.1 MB). Peak memory consumption was 105.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:27,090 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 143.7 MB. Free memory was 118.6 MB in the beginning and 118.4 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.05 ms. Allocated memory is still 143.7 MB. Free memory was 99.6 MB in the beginning and 89.6 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 108.19 ms. Allocated memory was 143.7 MB in the beginning and 199.2 MB in the end (delta: 55.6 MB). Free memory was 89.6 MB in the beginning and 178.3 MB in the end (delta: -88.8 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 287.37 ms. Allocated memory is still 199.2 MB. Free memory was 178.3 MB in the beginning and 163.4 MB in the end (delta: 14.9 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4763.06 ms. Allocated memory was 199.2 MB in the beginning and 229.1 MB in the end (delta: 29.9 MB). Free memory was 162.7 MB in the beginning and 86.7 MB in the end (delta: 76.1 MB). Peak memory consumption was 105.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 91]: 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: 24]: 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, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.5s, OverallIterations: 14, TraceHistogramMax: 1, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 654 SDtfs, 285 SDslu, 428 SDs, 0 SdLazy, 75 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 226 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=392occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 14 MinimizatonAttempts, 138 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 42 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 240 NumberOfCodeBlocks, 240 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 226 ConstructedInterpolants, 0 QuantifiedInterpolants, 6424 SizeOfPredicates, 0 NumberOfNonLiveVariables, 911 ConjunctsInSsa, 42 ConjunctsInUnsatCore, 14 InterpolantComputations, 14 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...