/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_8.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:16:33,481 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:16:33,484 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:16:33,503 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:16:33,504 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:16:33,506 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:16:33,508 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:16:33,519 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:16:33,521 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:16:33,522 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:16:33,524 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:16:33,525 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:16:33,525 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:16:33,526 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:16:33,526 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:16:33,531 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:16:33,533 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:16:33,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:16:33,538 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:16:33,544 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:16:33,546 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:16:33,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:16:33,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:16:33,553 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:16:33,558 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:16:33,571 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:16:33,571 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:16:33,572 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:16:33,573 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 16:16:33,587 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:16:33,588 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:16:33,589 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:16:33,589 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:16:33,589 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:16:33,589 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:16:33,590 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:16:33,590 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:16:33,590 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:16:33,590 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:16:33,590 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:16:33,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:16:33,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:16:33,591 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:16:33,591 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:16:33,591 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:16:33,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:16:33,592 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:16:33,592 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:16:33,592 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:16:33,592 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:16:33,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:33,593 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:16:33,593 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:16:33,593 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:16:33,593 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:16:33,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:33,594 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:16:33,594 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:16:33,594 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 16:16:33,921 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:16:33,937 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:16:33,944 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:16:33,945 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:16:33,946 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:16:33,947 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 16:16:34,028 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c134179/7621fc73c7a1476abf86f6a02c46718f/FLAG7357879e4 [2020-07-21 16:16:34,506 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:16:34,506 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 16:16:34,515 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c134179/7621fc73c7a1476abf86f6a02c46718f/FLAG7357879e4 [2020-07-21 16:16:34,866 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/31c134179/7621fc73c7a1476abf86f6a02c46718f [2020-07-21 16:16:34,875 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:16:34,879 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:16:34,880 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:34,880 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:16:34,883 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:16:34,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:34" (1/1) ... [2020-07-21 16:16:34,888 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f367fed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:34, skipping insertion in model container [2020-07-21 16:16:34,888 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:34" (1/1) ... [2020-07-21 16:16:34,896 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:16:34,923 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:16:35,095 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:35,101 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:16:35,126 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:35,142 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:16:35,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35 WrapperNode [2020-07-21 16:16:35,143 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:35,144 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:16:35,144 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:16:35,144 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:16:35,158 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,159 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,165 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,166 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,270 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,272 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (1/1) ... [2020-07-21 16:16:35,274 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:16:35,275 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:16:35,275 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:16:35,275 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:16:35,276 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (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 16:16:35,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:16:35,349 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:16:35,349 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:16:35,349 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:16:35,349 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:16:35,349 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:16:35,350 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:16:35,350 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:16:35,638 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:16:35,638 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:16:35,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:35 BoogieIcfgContainer [2020-07-21 16:16:35,643 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:16:35,644 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:16:35,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:16:35,649 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:16:35,649 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:16:34" (1/3) ... [2020-07-21 16:16:35,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6db4320d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:35, skipping insertion in model container [2020-07-21 16:16:35,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:35" (2/3) ... [2020-07-21 16:16:35,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6db4320d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:35, skipping insertion in model container [2020-07-21 16:16:35,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:35" (3/3) ... [2020-07-21 16:16:35,654 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-21 16:16:35,669 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:16:35,679 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:16:35,698 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:16:35,729 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:16:35,729 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:16:35,729 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:16:35,729 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:16:35,730 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:16:35,730 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:16:35,730 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:16:35,730 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:16:35,784 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-21 16:16:35,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:35,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:35,794 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 16:16:35,794 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:35,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:35,804 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-21 16:16:35,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:35,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089224551] [2020-07-21 16:16:35,812 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 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 16:16:35,911 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:35,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:35,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:35,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:35,963 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 16:16:35,963 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:35,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089224551] [2020-07-21 16:16:35,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:35,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:35,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270989754] [2020-07-21 16:16:35,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:35,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:35,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:35,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:35,990 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-21 16:16:36,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:36,051 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-21 16:16:36,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:36,053 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:36,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:36,065 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:16:36,065 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 16:16:36,069 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 16:16:36,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 16:16:36,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-21 16:16:36,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 16:16:36,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-21 16:16:36,117 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-21 16:16:36,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:36,118 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-21 16:16:36,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:36,118 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-21 16:16:36,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:36,119 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:36,120 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 16:16:36,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:36,336 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:36,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:36,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-21 16:16:36,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:36,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901195308] [2020-07-21 16:16:36,339 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 16:16:36,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:36,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:36,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:36,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:36,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:36,414 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:36,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901195308] [2020-07-21 16:16:36,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:36,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:36,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570055575] [2020-07-21 16:16:36,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:36,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:36,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:36,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:36,420 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-21 16:16:36,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:36,451 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-21 16:16:36,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:36,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:36,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:36,454 INFO L225 Difference]: With dead ends: 97 [2020-07-21 16:16:36,454 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 16:16:36,455 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 16:16:36,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 16:16:36,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-21 16:16:36,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 16:16:36,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-21 16:16:36,466 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-21 16:16:36,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:36,466 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-21 16:16:36,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:36,467 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-21 16:16:36,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:36,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:36,468 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:36,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:36,684 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:36,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:36,685 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-21 16:16:36,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:36,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033008693] [2020-07-21 16:16:36,687 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 16:16:36,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:36,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:36,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:36,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:36,764 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 16:16:36,764 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:36,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033008693] [2020-07-21 16:16:36,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:36,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:36,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093883207] [2020-07-21 16:16:36,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:36,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:36,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:36,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:36,768 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-21 16:16:36,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:36,800 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-07-21 16:16:36,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:36,802 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:36,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:36,804 INFO L225 Difference]: With dead ends: 90 [2020-07-21 16:16:36,804 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 16:16:36,807 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 16:16:36,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 16:16:36,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-07-21 16:16:36,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:16:36,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-07-21 16:16:36,826 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-07-21 16:16:36,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:36,826 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-07-21 16:16:36,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:36,827 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-07-21 16:16:36,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:36,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:36,828 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 16:16:37,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:37,041 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:37,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:37,042 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-07-21 16:16:37,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:37,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944357054] [2020-07-21 16:16:37,044 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 16:16:37,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:37,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:37,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:37,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:37,129 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 16:16:37,130 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:37,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944357054] [2020-07-21 16:16:37,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:37,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:37,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582513733] [2020-07-21 16:16:37,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:37,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:37,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:37,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:37,134 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-07-21 16:16:37,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:37,161 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-07-21 16:16:37,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:37,162 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:37,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:37,164 INFO L225 Difference]: With dead ends: 112 [2020-07-21 16:16:37,164 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:16:37,165 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 16:16:37,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:16:37,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 16:16:37,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 16:16:37,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-21 16:16:37,176 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-21 16:16:37,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:37,177 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-21 16:16:37,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:37,177 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-21 16:16:37,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:37,181 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:37,182 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 16:16:37,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:37,397 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:37,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:37,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-21 16:16:37,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:37,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181944977] [2020-07-21 16:16:37,400 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 16:16:37,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:37,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:37,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:37,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:37,464 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 16:16:37,464 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:37,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181944977] [2020-07-21 16:16:37,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:37,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:37,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533032732] [2020-07-21 16:16:37,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:37,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:37,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:37,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:37,467 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-21 16:16:37,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:37,489 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-21 16:16:37,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:37,489 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:37,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:37,492 INFO L225 Difference]: With dead ends: 184 [2020-07-21 16:16:37,492 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 16:16:37,493 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 16:16:37,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 16:16:37,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-21 16:16:37,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:16:37,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-21 16:16:37,505 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-21 16:16:37,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:37,506 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-21 16:16:37,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:37,506 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-21 16:16:37,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:37,507 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:37,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:37,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:37,719 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:37,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:37,720 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-21 16:16:37,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:37,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566770577] [2020-07-21 16:16:37,721 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 16:16:37,756 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:37,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:37,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:37,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:37,774 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 16:16:37,774 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:37,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566770577] [2020-07-21 16:16:37,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:37,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:37,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996433337] [2020-07-21 16:16:37,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:37,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:37,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:37,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:37,778 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-21 16:16:37,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:37,797 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-07-21 16:16:37,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:37,798 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:37,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:37,799 INFO L225 Difference]: With dead ends: 165 [2020-07-21 16:16:37,800 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 16:16:37,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:37,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 16:16:37,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-07-21 16:16:37,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 16:16:37,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-07-21 16:16:37,813 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-07-21 16:16:37,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:37,814 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-07-21 16:16:37,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:37,814 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-07-21 16:16:37,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:37,815 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:37,815 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:38,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:38,032 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:38,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:38,032 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-07-21 16:16:38,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:38,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847532940] [2020-07-21 16:16:38,033 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 16:16:38,068 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:38,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:38,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:38,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:38,077 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 16:16:38,077 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:38,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847532940] [2020-07-21 16:16:38,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:38,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:38,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713711327] [2020-07-21 16:16:38,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:38,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:38,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:38,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,080 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-07-21 16:16:38,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:38,102 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-07-21 16:16:38,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:38,103 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:38,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:38,104 INFO L225 Difference]: With dead ends: 204 [2020-07-21 16:16:38,104 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 16:16:38,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 16:16:38,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-07-21 16:16:38,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 16:16:38,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-21 16:16:38,119 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-21 16:16:38,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:38,119 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-21 16:16:38,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:38,120 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-21 16:16:38,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:38,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:38,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:38,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:38,335 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:38,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:38,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-21 16:16:38,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:38,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851973844] [2020-07-21 16:16:38,337 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 16:16:38,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:38,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:38,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:38,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:38,386 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 16:16:38,387 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:38,387 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851973844] [2020-07-21 16:16:38,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:38,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:38,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973182406] [2020-07-21 16:16:38,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:38,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:38,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:38,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,391 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-21 16:16:38,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:38,416 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-21 16:16:38,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:38,417 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:38,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:38,419 INFO L225 Difference]: With dead ends: 352 [2020-07-21 16:16:38,419 INFO L226 Difference]: Without dead ends: 210 [2020-07-21 16:16:38,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-21 16:16:38,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-21 16:16:38,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 16:16:38,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-21 16:16:38,435 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-21 16:16:38,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:38,436 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-21 16:16:38,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:38,436 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-21 16:16:38,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:38,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:38,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:38,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:38,653 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:38,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:38,654 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-21 16:16:38,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:38,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695422439] [2020-07-21 16:16:38,656 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 16:16:38,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:38,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:38,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:38,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:38,701 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 16:16:38,702 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:38,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695422439] [2020-07-21 16:16:38,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:38,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:38,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746662688] [2020-07-21 16:16:38,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:38,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:38,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:38,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,704 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-21 16:16:38,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:38,730 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 16:16:38,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:38,731 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:38,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:38,732 INFO L225 Difference]: With dead ends: 312 [2020-07-21 16:16:38,733 INFO L226 Difference]: Without dead ends: 214 [2020-07-21 16:16:38,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:38,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-21 16:16:38,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 212. [2020-07-21 16:16:38,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2020-07-21 16:16:38,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 338 transitions. [2020-07-21 16:16:38,759 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 338 transitions. Word has length 21 [2020-07-21 16:16:38,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:38,759 INFO L479 AbstractCegarLoop]: Abstraction has 212 states and 338 transitions. [2020-07-21 16:16:38,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:38,759 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 338 transitions. [2020-07-21 16:16:38,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:38,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:38,761 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:38,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:38,971 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:38,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:38,972 INFO L82 PathProgramCache]: Analyzing trace with hash 91259814, now seen corresponding path program 1 times [2020-07-21 16:16:38,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:38,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082856195] [2020-07-21 16:16:38,973 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 16:16:39,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:39,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:39,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:39,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:39,017 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 16:16:39,018 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:39,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082856195] [2020-07-21 16:16:39,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:39,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:39,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661941990] [2020-07-21 16:16:39,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:39,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:39,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:39,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,021 INFO L87 Difference]: Start difference. First operand 212 states and 338 transitions. Second operand 3 states. [2020-07-21 16:16:39,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:39,043 INFO L93 Difference]: Finished difference Result 380 states and 616 transitions. [2020-07-21 16:16:39,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:39,044 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:39,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:39,046 INFO L225 Difference]: With dead ends: 380 [2020-07-21 16:16:39,046 INFO L226 Difference]: Without dead ends: 378 [2020-07-21 16:16:39,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-21 16:16:39,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 296. [2020-07-21 16:16:39,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 16:16:39,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-07-21 16:16:39,060 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-07-21 16:16:39,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:39,060 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-07-21 16:16:39,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:39,061 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-07-21 16:16:39,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:39,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:39,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:39,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:39,279 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:39,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:39,279 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-07-21 16:16:39,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:39,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726094106] [2020-07-21 16:16:39,281 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 16:16:39,311 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:39,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:39,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:39,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:39,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:39,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:39,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726094106] [2020-07-21 16:16:39,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:39,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:39,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801808696] [2020-07-21 16:16:39,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:39,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:39,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:39,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,340 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-07-21 16:16:39,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:39,376 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-07-21 16:16:39,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:39,377 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:39,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:39,380 INFO L225 Difference]: With dead ends: 684 [2020-07-21 16:16:39,380 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 16:16:39,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 16:16:39,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-07-21 16:16:39,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 16:16:39,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-07-21 16:16:39,419 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-07-21 16:16:39,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:39,420 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-07-21 16:16:39,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:39,420 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-07-21 16:16:39,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:39,422 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:39,422 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:39,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:39,637 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:39,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:39,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-07-21 16:16:39,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:39,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551141372] [2020-07-21 16:16:39,639 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 16:16:39,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:39,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:39,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:39,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:39,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:39,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:39,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551141372] [2020-07-21 16:16:39,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:39,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:39,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491609553] [2020-07-21 16:16:39,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:39,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:39,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:39,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,693 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-07-21 16:16:39,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:39,719 INFO L93 Difference]: Finished difference Result 600 states and 916 transitions. [2020-07-21 16:16:39,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:39,720 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:39,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:39,722 INFO L225 Difference]: With dead ends: 600 [2020-07-21 16:16:39,723 INFO L226 Difference]: Without dead ends: 410 [2020-07-21 16:16:39,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:39,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-21 16:16:39,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 408. [2020-07-21 16:16:39,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 16:16:39,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 614 transitions. [2020-07-21 16:16:39,743 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 614 transitions. Word has length 22 [2020-07-21 16:16:39,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:39,744 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 614 transitions. [2020-07-21 16:16:39,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:39,744 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 614 transitions. [2020-07-21 16:16:39,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:39,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:39,746 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:39,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:39,958 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:39,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:39,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1207532573, now seen corresponding path program 1 times [2020-07-21 16:16:39,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:39,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57525359] [2020-07-21 16:16:39,961 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 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 16:16:39,996 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:39,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:39,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:39,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:40,023 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 16:16:40,024 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:40,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57525359] [2020-07-21 16:16:40,026 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:40,026 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:40,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955723421] [2020-07-21 16:16:40,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:40,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:40,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:40,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,028 INFO L87 Difference]: Start difference. First operand 408 states and 614 transitions. Second operand 3 states. [2020-07-21 16:16:40,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:40,056 INFO L93 Difference]: Finished difference Result 716 states and 1096 transitions. [2020-07-21 16:16:40,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:40,061 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:40,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:40,066 INFO L225 Difference]: With dead ends: 716 [2020-07-21 16:16:40,066 INFO L226 Difference]: Without dead ends: 714 [2020-07-21 16:16:40,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2020-07-21 16:16:40,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 584. [2020-07-21 16:16:40,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 16:16:40,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-07-21 16:16:40,086 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-07-21 16:16:40,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:40,086 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-07-21 16:16:40,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:40,087 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-07-21 16:16:40,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 16:16:40,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:40,089 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:40,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:40,302 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:40,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:40,303 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-07-21 16:16:40,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:40,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470928436] [2020-07-21 16:16:40,304 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 16:16:40,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:40,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:40,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:40,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:40,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:40,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:40,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470928436] [2020-07-21 16:16:40,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:40,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:40,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377354148] [2020-07-21 16:16:40,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:40,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:40,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:40,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,349 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-07-21 16:16:40,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:40,375 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-07-21 16:16:40,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:40,376 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 16:16:40,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:40,380 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 16:16:40,380 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 16:16:40,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 16:16:40,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 16:16:40,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 16:16:40,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-07-21 16:16:40,407 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-07-21 16:16:40,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:40,407 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-07-21 16:16:40,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:40,408 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-07-21 16:16:40,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:40,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:40,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:40,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:40,625 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:40,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:40,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-07-21 16:16:40,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:40,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930367863] [2020-07-21 16:16:40,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:40,654 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:40,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:40,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:40,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:40,671 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 16:16:40,671 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:40,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930367863] [2020-07-21 16:16:40,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:40,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:40,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12709470] [2020-07-21 16:16:40,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:40,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:40,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:40,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,673 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-07-21 16:16:40,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:40,696 INFO L93 Difference]: Finished difference Result 1164 states and 1656 transitions. [2020-07-21 16:16:40,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:40,696 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:40,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:40,700 INFO L225 Difference]: With dead ends: 1164 [2020-07-21 16:16:40,700 INFO L226 Difference]: Without dead ends: 794 [2020-07-21 16:16:40,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2020-07-21 16:16:40,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 792. [2020-07-21 16:16:40,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-21 16:16:40,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1110 transitions. [2020-07-21 16:16:40,727 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 1110 transitions. Word has length 23 [2020-07-21 16:16:40,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:40,727 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 1110 transitions. [2020-07-21 16:16:40,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:40,727 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 1110 transitions. [2020-07-21 16:16:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:40,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:40,729 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:40,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:40,943 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:40,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:40,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1479576731, now seen corresponding path program 1 times [2020-07-21 16:16:40,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:40,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [385726929] [2020-07-21 16:16:40,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:40,975 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:40,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:40,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:40,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:40,992 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 16:16:40,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:40,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [385726929] [2020-07-21 16:16:40,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:40,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:40,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461810807] [2020-07-21 16:16:40,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:40,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:40,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:40,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:40,998 INFO L87 Difference]: Start difference. First operand 792 states and 1110 transitions. Second operand 3 states. [2020-07-21 16:16:41,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:41,044 INFO L93 Difference]: Finished difference Result 1356 states and 1928 transitions. [2020-07-21 16:16:41,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:41,045 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:41,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:41,053 INFO L225 Difference]: With dead ends: 1356 [2020-07-21 16:16:41,053 INFO L226 Difference]: Without dead ends: 1354 [2020-07-21 16:16:41,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:41,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-07-21 16:16:41,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1160. [2020-07-21 16:16:41,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1160 states. [2020-07-21 16:16:41,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions. [2020-07-21 16:16:41,099 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23 [2020-07-21 16:16:41,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:41,100 INFO L479 AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions. [2020-07-21 16:16:41,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:41,100 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions. [2020-07-21 16:16:41,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 16:16:41,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:41,102 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:41,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:41,312 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:41,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:41,313 INFO L82 PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times [2020-07-21 16:16:41,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:41,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592117626] [2020-07-21 16:16:41,314 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:41,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:41,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:41,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:41,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:41,392 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 16:16:41,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:41,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592117626] [2020-07-21 16:16:41,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:41,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:41,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446735321] [2020-07-21 16:16:41,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:41,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:41,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:41,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:41,402 INFO L87 Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states. [2020-07-21 16:16:41,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:41,456 INFO L93 Difference]: Finished difference Result 2636 states and 3560 transitions. [2020-07-21 16:16:41,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:41,457 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 16:16:41,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:41,467 INFO L225 Difference]: With dead ends: 2636 [2020-07-21 16:16:41,467 INFO L226 Difference]: Without dead ends: 1514 [2020-07-21 16:16:41,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:41,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2020-07-21 16:16:41,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512. [2020-07-21 16:16:41,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-07-21 16:16:41,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions. [2020-07-21 16:16:41,581 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23 [2020-07-21 16:16:41,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:41,584 INFO L479 AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions. [2020-07-21 16:16:41,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:41,584 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions. [2020-07-21 16:16:41,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:41,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:41,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:41,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:41,804 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:41,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:41,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times [2020-07-21 16:16:41,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:41,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184677133] [2020-07-21 16:16:41,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:41,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:41,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:41,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:41,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:41,860 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 16:16:41,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:41,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184677133] [2020-07-21 16:16:41,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:41,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:41,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997771210] [2020-07-21 16:16:41,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:41,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:41,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:41,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:41,863 INFO L87 Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states. [2020-07-21 16:16:41,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:41,902 INFO L93 Difference]: Finished difference Result 2268 states and 2968 transitions. [2020-07-21 16:16:41,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:41,903 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:41,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:41,909 INFO L225 Difference]: With dead ends: 2268 [2020-07-21 16:16:41,910 INFO L226 Difference]: Without dead ends: 1546 [2020-07-21 16:16:41,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:41,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1546 states. [2020-07-21 16:16:41,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544. [2020-07-21 16:16:41,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 16:16:41,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 1990 transitions. [2020-07-21 16:16:41,959 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 1990 transitions. Word has length 24 [2020-07-21 16:16:41,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:41,959 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 1990 transitions. [2020-07-21 16:16:41,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:41,959 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 1990 transitions. [2020-07-21 16:16:41,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:41,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:41,962 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:42,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:42,176 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:42,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:42,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1119380424, now seen corresponding path program 1 times [2020-07-21 16:16:42,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:42,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44889861] [2020-07-21 16:16:42,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:42,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:42,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:42,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:42,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:42,229 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 16:16:42,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:42,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44889861] [2020-07-21 16:16:42,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:42,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:42,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490621661] [2020-07-21 16:16:42,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:42,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:42,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:42,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:42,232 INFO L87 Difference]: Start difference. First operand 1544 states and 1990 transitions. Second operand 3 states. [2020-07-21 16:16:42,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:42,279 INFO L93 Difference]: Finished difference Result 2572 states and 3336 transitions. [2020-07-21 16:16:42,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:42,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:42,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:42,290 INFO L225 Difference]: With dead ends: 2572 [2020-07-21 16:16:42,290 INFO L226 Difference]: Without dead ends: 2570 [2020-07-21 16:16:42,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:42,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2570 states. [2020-07-21 16:16:42,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2312. [2020-07-21 16:16:42,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2312 states. [2020-07-21 16:16:42,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions. [2020-07-21 16:16:42,360 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24 [2020-07-21 16:16:42,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:42,360 INFO L479 AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions. [2020-07-21 16:16:42,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:42,361 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions. [2020-07-21 16:16:42,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 16:16:42,365 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:42,365 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:42,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:42,579 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:42,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:42,579 INFO L82 PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times [2020-07-21 16:16:42,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:42,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289394431] [2020-07-21 16:16:42,580 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:42,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:42,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:42,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:42,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:42,626 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 16:16:42,627 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:42,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289394431] [2020-07-21 16:16:42,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:42,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:42,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675669840] [2020-07-21 16:16:42,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:42,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:42,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:42,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:42,629 INFO L87 Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states. [2020-07-21 16:16:42,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:42,699 INFO L93 Difference]: Finished difference Result 5196 states and 6408 transitions. [2020-07-21 16:16:42,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:42,700 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 16:16:42,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:42,713 INFO L225 Difference]: With dead ends: 5196 [2020-07-21 16:16:42,713 INFO L226 Difference]: Without dead ends: 2954 [2020-07-21 16:16:42,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:42,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-21 16:16:42,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952. [2020-07-21 16:16:42,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2952 states. [2020-07-21 16:16:42,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions. [2020-07-21 16:16:42,813 INFO L78 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24 [2020-07-21 16:16:42,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:42,814 INFO L479 AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions. [2020-07-21 16:16:42,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:42,814 INFO L276 IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions. [2020-07-21 16:16:42,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:42,818 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:42,819 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:43,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,032 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:43,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:43,033 INFO L82 PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times [2020-07-21 16:16:43,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:43,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263824196] [2020-07-21 16:16:43,034 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:43,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:43,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:43,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:43,077 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 16:16:43,077 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:43,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263824196] [2020-07-21 16:16:43,077 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:43,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:43,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251260883] [2020-07-21 16:16:43,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:43,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:43,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:43,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:43,079 INFO L87 Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states. [2020-07-21 16:16:43,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:43,138 INFO L93 Difference]: Finished difference Result 4428 states and 5256 transitions. [2020-07-21 16:16:43,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:43,139 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:43,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:43,151 INFO L225 Difference]: With dead ends: 4428 [2020-07-21 16:16:43,151 INFO L226 Difference]: Without dead ends: 3018 [2020-07-21 16:16:43,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:43,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3018 states. [2020-07-21 16:16:43,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016. [2020-07-21 16:16:43,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 16:16:43,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions. [2020-07-21 16:16:43,230 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25 [2020-07-21 16:16:43,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:43,231 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions. [2020-07-21 16:16:43,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:43,231 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions. [2020-07-21 16:16:43,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:43,235 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:43,235 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:43,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,447 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:43,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:43,447 INFO L82 PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times [2020-07-21 16:16:43,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:43,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [779715217] [2020-07-21 16:16:43,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:43,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:43,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:43,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:43,483 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 16:16:43,484 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:43,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [779715217] [2020-07-21 16:16:43,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:43,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:43,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009012721] [2020-07-21 16:16:43,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:43,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:43,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:43,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:43,485 INFO L87 Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states. [2020-07-21 16:16:43,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:43,564 INFO L93 Difference]: Finished difference Result 8650 states and 9799 transitions. [2020-07-21 16:16:43,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:43,564 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:43,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:43,576 INFO L225 Difference]: With dead ends: 8650 [2020-07-21 16:16:43,577 INFO L226 Difference]: Without dead ends: 3016 [2020-07-21 16:16:43,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:43,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2020-07-21 16:16:43,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016. [2020-07-21 16:16:43,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 16:16:43,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions. [2020-07-21 16:16:43,704 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25 [2020-07-21 16:16:43,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:43,705 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions. [2020-07-21 16:16:43,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:43,705 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions. [2020-07-21 16:16:43,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:16:43,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:43,713 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:43,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,928 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:43,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:43,929 INFO L82 PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times [2020-07-21 16:16:43,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:43,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896688523] [2020-07-21 16:16:43,930 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:43,976 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:43,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:43,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:43,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:43,985 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 16:16:43,986 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:43,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896688523] [2020-07-21 16:16:43,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:43,987 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:43,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216987808] [2020-07-21 16:16:43,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:43,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:43,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:43,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:43,989 INFO L87 Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states. [2020-07-21 16:16:44,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:44,038 INFO L93 Difference]: Finished difference Result 3016 states and 3270 transitions. [2020-07-21 16:16:44,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:44,039 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 16:16:44,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:44,039 INFO L225 Difference]: With dead ends: 3016 [2020-07-21 16:16:44,039 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:16:44,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:44,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:16:44,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:16:44,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:16:44,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:16:44,048 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-21 16:16:44,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:44,049 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:16:44,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:44,049 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:16:44,049 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:16:44,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:44,267 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:16:44,352 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:16:44,352 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:44,352 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:44,352 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:16:44,353 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:16:44,353 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:16:44,353 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-21 16:16:44,353 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-21 16:16:44,353 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,353 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-21 16:16:44,354 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-21 16:16:44,355 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,356 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-21 16:16:44,356 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-21 16:16:44,356 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,356 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,356 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-21 16:16:44,356 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-21 16:16:44,357 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,357 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-21 16:16:44,357 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,357 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,357 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-21 16:16:44,357 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-21 16:16:44,358 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 16:16:44,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:16:44 BoogieIcfgContainer [2020-07-21 16:16:44,372 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:16:44,375 INFO L168 Benchmark]: Toolchain (without parser) took 9496.61 ms. Allocated memory was 145.2 MB in the beginning and 283.6 MB in the end (delta: 138.4 MB). Free memory was 103.1 MB in the beginning and 218.0 MB in the end (delta: -114.9 MB). Peak memory consumption was 23.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,376 INFO L168 Benchmark]: CDTParser took 0.79 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,376 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.68 ms. Allocated memory is still 145.2 MB. Free memory was 102.7 MB in the beginning and 92.2 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,377 INFO L168 Benchmark]: Boogie Preprocessor took 130.99 ms. Allocated memory was 145.2 MB in the beginning and 202.9 MB in the end (delta: 57.7 MB). Free memory was 92.2 MB in the beginning and 182.0 MB in the end (delta: -89.8 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,377 INFO L168 Benchmark]: RCFGBuilder took 367.77 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 164.1 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,378 INFO L168 Benchmark]: TraceAbstraction took 8727.55 ms. Allocated memory was 202.9 MB in the beginning and 283.6 MB in the end (delta: 80.7 MB). Free memory was 163.4 MB in the beginning and 218.0 MB in the end (delta: -54.6 MB). Peak memory consumption was 26.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:44,379 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.79 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.68 ms. Allocated memory is still 145.2 MB. Free memory was 102.7 MB in the beginning and 92.2 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 130.99 ms. Allocated memory was 145.2 MB in the beginning and 202.9 MB in the end (delta: 57.7 MB). Free memory was 92.2 MB in the beginning and 182.0 MB in the end (delta: -89.8 MB). Peak memory consumption was 11.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 367.77 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 164.1 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8727.55 ms. Allocated memory was 202.9 MB in the beginning and 283.6 MB in the end (delta: 80.7 MB). Free memory was 163.4 MB in the beginning and 218.0 MB in the end (delta: -54.6 MB). Peak memory consumption was 26.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 133]: 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: 33]: 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, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.5s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1573 SDtfs, 755 SDslu, 1056 SDs, 0 SdLazy, 121 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 475 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3016occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.8s AutomataMinimizationTime, 23 MinimizatonAttempts, 790 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 498 NumberOfCodeBlocks, 498 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2132 ConjunctsInSsa, 69 ConjunctsInUnsatCore, 23 InterpolantComputations, 23 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...