/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_FUNCTIONS --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 13:36:01,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:36:01,951 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:36:01,971 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 13:36:01,981 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:36:01,982 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:36:01,983 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:36:01,984 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:36:01,985 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:36:01,986 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:36:01,988 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:36:01,991 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:36:01,993 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:36:01,994 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:36:01,995 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:36:01,996 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:36:01,999 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:36:02,007 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:36:02,008 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:36:02,008 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:36:02,009 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 13:36:02,026 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:36:02,026 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:36:02,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:36:02,027 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:36:02,028 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:36:02,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:36:02,028 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:36:02,028 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:36:02,029 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:36:02,029 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:36:02,029 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:36:02,029 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:36:02,029 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:36:02,030 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:36:02,030 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:36:02,030 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:36:02,030 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:36:02,030 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:36:02,031 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:36:02,031 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:36:02,031 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:36:02,031 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:36:02,031 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:36:02,032 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:36:02,032 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:36:02,032 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:36:02,032 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:02,032 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:36:02,033 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:36:02,033 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_FUNCTIONS 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 13:36:02,359 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:36:02,381 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:36:02,387 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:36:02,388 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:36:02,389 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:36:02,390 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 13:36:02,458 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/792bcec8a/aa5b55340d7b42bd81951171694ac7f7/FLAG9eb92d1c2 [2020-07-21 13:36:03,025 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:36:03,026 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c [2020-07-21 13:36:03,037 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/792bcec8a/aa5b55340d7b42bd81951171694ac7f7/FLAG9eb92d1c2 [2020-07-21 13:36:03,332 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/792bcec8a/aa5b55340d7b42bd81951171694ac7f7 [2020-07-21 13:36:03,343 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:36:03,347 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:36:03,348 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:36:03,348 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:36:03,352 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:36:03,353 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,357 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b8f7a24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03, skipping insertion in model container [2020-07-21 13:36:03,357 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,365 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:36:03,391 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:36:03,576 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:36:03,581 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:36:03,607 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:36:03,624 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:36:03,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03 WrapperNode [2020-07-21 13:36:03,625 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:36:03,626 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:36:03,626 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:36:03,627 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:36:03,642 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,642 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,650 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,650 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,656 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,664 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,665 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (1/1) ... [2020-07-21 13:36:03,668 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:36:03,669 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:36:03,669 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:36:03,669 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:36:03,670 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (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 13:36:03,838 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:36:03,838 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:36:03,838 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:36:03,838 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:36:03,839 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:36:03,839 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:36:03,839 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:36:03,839 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:36:04,140 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:36:04,141 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 13:36:04,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:36:04 BoogieIcfgContainer [2020-07-21 13:36:04,147 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:36:04,149 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:36:04,149 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:36:04,153 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:36:04,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:36:03" (1/3) ... [2020-07-21 13:36:04,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@195209ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:36:04, skipping insertion in model container [2020-07-21 13:36:04,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:36:03" (2/3) ... [2020-07-21 13:36:04,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@195209ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:36:04, skipping insertion in model container [2020-07-21 13:36:04,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:36:04" (3/3) ... [2020-07-21 13:36:04,158 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_8.c [2020-07-21 13:36:04,171 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:36:04,190 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:36:04,209 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:36:04,237 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:36:04,238 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:36:04,238 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:36:04,238 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:36:04,238 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:36:04,239 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:36:04,239 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:36:04,239 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:36:04,262 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-07-21 13:36:04,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:36:04,269 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:04,270 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 13:36:04,271 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:04,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:04,280 INFO L82 PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times [2020-07-21 13:36:04,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:04,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114814236] [2020-07-21 13:36:04,300 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 13:36:04,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:04,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:04,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:04,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:04,450 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 13:36:04,451 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:04,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114814236] [2020-07-21 13:36:04,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:04,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:04,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562128921] [2020-07-21 13:36:04,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:04,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:04,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:04,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:04,481 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2020-07-21 13:36:04,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:04,558 INFO L93 Difference]: Finished difference Result 75 states and 126 transitions. [2020-07-21 13:36:04,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:04,561 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:36:04,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:04,575 INFO L225 Difference]: With dead ends: 75 [2020-07-21 13:36:04,576 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:36:04,580 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 13:36:04,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:36:04,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-21 13:36:04,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 13:36:04,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions. [2020-07-21 13:36:04,630 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18 [2020-07-21 13:36:04,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:04,631 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 73 transitions. [2020-07-21 13:36:04,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:04,631 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions. [2020-07-21 13:36:04,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 13:36:04,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:04,632 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 13:36:04,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:04,848 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:04,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:04,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times [2020-07-21 13:36:04,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:04,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [690267100] [2020-07-21 13:36:04,851 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 13:36:04,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:04,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:04,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:04,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:04,927 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 13:36:04,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:04,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [690267100] [2020-07-21 13:36:04,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:04,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:04,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355937573] [2020-07-21 13:36:04,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:04,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:04,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:04,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:04,935 INFO L87 Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states. [2020-07-21 13:36:04,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:04,962 INFO L93 Difference]: Finished difference Result 97 states and 172 transitions. [2020-07-21 13:36:04,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:04,963 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 13:36:04,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:04,965 INFO L225 Difference]: With dead ends: 97 [2020-07-21 13:36:04,965 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 13:36:04,967 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 13:36:04,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 13:36:04,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2020-07-21 13:36:04,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 13:36:04,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions. [2020-07-21 13:36:04,978 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18 [2020-07-21 13:36:04,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:04,979 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 101 transitions. [2020-07-21 13:36:04,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:04,979 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions. [2020-07-21 13:36:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:36:04,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:04,981 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 13:36:05,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:05,196 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:05,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:05,197 INFO L82 PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times [2020-07-21 13:36:05,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:05,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477234281] [2020-07-21 13:36:05,198 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:36:05,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:05,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:05,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:05,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:05,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:36:05,263 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:05,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477234281] [2020-07-21 13:36:05,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:05,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:05,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964078790] [2020-07-21 13:36:05,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:05,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:05,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:05,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:05,266 INFO L87 Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states. [2020-07-21 13:36:05,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:05,292 INFO L93 Difference]: Finished difference Result 90 states and 153 transitions. [2020-07-21 13:36:05,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:05,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:36:05,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:05,295 INFO L225 Difference]: With dead ends: 90 [2020-07-21 13:36:05,295 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 13:36:05,296 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 13:36:05,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 13:36:05,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2020-07-21 13:36:05,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:36:05,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions. [2020-07-21 13:36:05,305 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19 [2020-07-21 13:36:05,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:05,306 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 103 transitions. [2020-07-21 13:36:05,306 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:05,306 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions. [2020-07-21 13:36:05,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:36:05,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:05,308 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 13:36:05,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:05,514 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:05,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:05,515 INFO L82 PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times [2020-07-21 13:36:05,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:05,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642455277] [2020-07-21 13:36:05,516 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 13:36:05,564 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:05,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:05,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:05,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:05,580 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 13:36:05,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:05,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642455277] [2020-07-21 13:36:05,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:05,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:05,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446128151] [2020-07-21 13:36:05,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:05,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:05,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:05,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:05,584 INFO L87 Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states. [2020-07-21 13:36:05,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:05,630 INFO L93 Difference]: Finished difference Result 112 states and 192 transitions. [2020-07-21 13:36:05,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:05,630 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:36:05,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:05,632 INFO L225 Difference]: With dead ends: 112 [2020-07-21 13:36:05,633 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 13:36:05,637 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 13:36:05,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 13:36:05,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 13:36:05,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 13:36:05,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions. [2020-07-21 13:36:05,660 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19 [2020-07-21 13:36:05,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:05,661 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 136 transitions. [2020-07-21 13:36:05,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:05,661 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions. [2020-07-21 13:36:05,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:36:05,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:05,664 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 13:36:05,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:05,879 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:05,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:05,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times [2020-07-21 13:36:05,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:05,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313619743] [2020-07-21 13:36:05,882 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 13:36:05,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:05,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:05,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:05,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:05,939 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 13:36:05,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:05,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313619743] [2020-07-21 13:36:05,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:05,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:05,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434695895] [2020-07-21 13:36:05,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:05,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:05,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:05,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:05,943 INFO L87 Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states. [2020-07-21 13:36:05,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:05,984 INFO L93 Difference]: Finished difference Result 184 states and 318 transitions. [2020-07-21 13:36:05,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:05,985 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 13:36:05,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:05,987 INFO L225 Difference]: With dead ends: 184 [2020-07-21 13:36:05,987 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 13:36:05,988 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 13:36:05,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 13:36:05,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110. [2020-07-21 13:36:05,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 13:36:05,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions. [2020-07-21 13:36:06,000 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19 [2020-07-21 13:36:06,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:06,000 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 186 transitions. [2020-07-21 13:36:06,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:06,001 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions. [2020-07-21 13:36:06,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:36:06,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:06,002 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 13:36:06,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:06,217 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:06,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:06,218 INFO L82 PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times [2020-07-21 13:36:06,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:06,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380032394] [2020-07-21 13:36:06,219 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 13:36:06,258 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:06,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:06,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:06,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:06,275 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 13:36:06,275 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:06,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380032394] [2020-07-21 13:36:06,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:06,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:06,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735365375] [2020-07-21 13:36:06,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:06,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:06,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:06,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:06,278 INFO L87 Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states. [2020-07-21 13:36:06,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:06,293 INFO L93 Difference]: Finished difference Result 165 states and 277 transitions. [2020-07-21 13:36:06,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:06,294 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:36:06,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:06,296 INFO L225 Difference]: With dead ends: 165 [2020-07-21 13:36:06,296 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 13:36:06,297 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 13:36:06,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 13:36:06,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2020-07-21 13:36:06,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 13:36:06,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions. [2020-07-21 13:36:06,307 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20 [2020-07-21 13:36:06,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:06,307 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 186 transitions. [2020-07-21 13:36:06,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:06,308 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions. [2020-07-21 13:36:06,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:36:06,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:06,309 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 13:36:06,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:06,525 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:06,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:06,526 INFO L82 PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times [2020-07-21 13:36:06,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:06,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685492396] [2020-07-21 13:36:06,527 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 13:36:06,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:06,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:06,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:06,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:06,581 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 13:36:06,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:06,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685492396] [2020-07-21 13:36:06,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:06,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:06,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169337900] [2020-07-21 13:36:06,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:06,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:06,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:06,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:06,584 INFO L87 Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states. [2020-07-21 13:36:06,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:06,608 INFO L93 Difference]: Finished difference Result 204 states and 344 transitions. [2020-07-21 13:36:06,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:06,609 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:36:06,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:06,611 INFO L225 Difference]: With dead ends: 204 [2020-07-21 13:36:06,611 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 13:36:06,613 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 13:36:06,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 13:36:06,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152. [2020-07-21 13:36:06,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-21 13:36:06,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions. [2020-07-21 13:36:06,643 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20 [2020-07-21 13:36:06,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:06,643 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 250 transitions. [2020-07-21 13:36:06,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:06,644 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions. [2020-07-21 13:36:06,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 13:36:06,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:06,646 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 13:36:06,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:06,855 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:06,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:06,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times [2020-07-21 13:36:06,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:06,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162142056] [2020-07-21 13:36:06,857 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 13:36:06,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:06,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:06,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:06,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:06,910 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 13:36:06,910 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:06,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162142056] [2020-07-21 13:36:06,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:06,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:06,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338752319] [2020-07-21 13:36:06,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:06,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:06,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:06,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:06,913 INFO L87 Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states. [2020-07-21 13:36:06,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:06,948 INFO L93 Difference]: Finished difference Result 352 states and 584 transitions. [2020-07-21 13:36:06,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:06,949 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 13:36:06,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:06,951 INFO L225 Difference]: With dead ends: 352 [2020-07-21 13:36:06,951 INFO L226 Difference]: Without dead ends: 210 [2020-07-21 13:36:06,954 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 13:36:06,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2020-07-21 13:36:06,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2020-07-21 13:36:06,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 13:36:06,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions. [2020-07-21 13:36:06,985 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20 [2020-07-21 13:36:06,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:06,985 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 338 transitions. [2020-07-21 13:36:06,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:06,985 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions. [2020-07-21 13:36:06,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:36:06,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:06,992 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 13:36:07,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:07,195 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:07,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:07,196 INFO L82 PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times [2020-07-21 13:36:07,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:07,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103536820] [2020-07-21 13:36:07,197 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 13:36:07,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:07,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:07,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:07,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:07,242 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 13:36:07,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:07,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103536820] [2020-07-21 13:36:07,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:07,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:07,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327116339] [2020-07-21 13:36:07,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:07,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:07,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:07,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:07,245 INFO L87 Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states. [2020-07-21 13:36:07,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:07,267 INFO L93 Difference]: Finished difference Result 376 states and 620 transitions. [2020-07-21 13:36:07,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:07,270 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:36:07,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:07,273 INFO L225 Difference]: With dead ends: 376 [2020-07-21 13:36:07,274 INFO L226 Difference]: Without dead ends: 374 [2020-07-21 13:36:07,276 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 13:36:07,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2020-07-21 13:36:07,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 292. [2020-07-21 13:36:07,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2020-07-21 13:36:07,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 466 transitions. [2020-07-21 13:36:07,300 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 466 transitions. Word has length 21 [2020-07-21 13:36:07,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:07,301 INFO L479 AbstractCegarLoop]: Abstraction has 292 states and 466 transitions. [2020-07-21 13:36:07,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:07,301 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 466 transitions. [2020-07-21 13:36:07,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:36:07,306 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:07,307 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 13:36:07,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:07,510 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:07,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:07,511 INFO L82 PathProgramCache]: Analyzing trace with hash 534158954, now seen corresponding path program 1 times [2020-07-21 13:36:07,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:07,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016694132] [2020-07-21 13:36:07,513 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 13:36:07,556 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:07,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:07,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:07,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:07,575 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 13:36:07,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:07,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016694132] [2020-07-21 13:36:07,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:07,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:07,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262465458] [2020-07-21 13:36:07,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:07,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:07,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:07,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:07,579 INFO L87 Difference]: Start difference. First operand 292 states and 466 transitions. Second operand 3 states. [2020-07-21 13:36:07,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:07,614 INFO L93 Difference]: Finished difference Result 436 states and 692 transitions. [2020-07-21 13:36:07,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:07,614 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:36:07,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:07,618 INFO L225 Difference]: With dead ends: 436 [2020-07-21 13:36:07,618 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 13:36:07,622 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 13:36:07,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 13:36:07,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 296. [2020-07-21 13:36:07,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-21 13:36:07,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions. [2020-07-21 13:36:07,644 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21 [2020-07-21 13:36:07,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:07,645 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 462 transitions. [2020-07-21 13:36:07,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:07,645 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions. [2020-07-21 13:36:07,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 13:36:07,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:07,647 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 13:36:07,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:07,861 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:07,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:07,862 INFO L82 PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times [2020-07-21 13:36:07,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:07,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [818101231] [2020-07-21 13:36:07,863 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 13:36:07,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:07,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:07,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:07,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:07,907 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 13:36:07,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:07,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [818101231] [2020-07-21 13:36:07,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:07,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:07,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691457519] [2020-07-21 13:36:07,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:07,914 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:07,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:07,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:07,915 INFO L87 Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states. [2020-07-21 13:36:07,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:07,948 INFO L93 Difference]: Finished difference Result 684 states and 1072 transitions. [2020-07-21 13:36:07,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:07,949 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 13:36:07,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:07,952 INFO L225 Difference]: With dead ends: 684 [2020-07-21 13:36:07,952 INFO L226 Difference]: Without dead ends: 402 [2020-07-21 13:36:07,955 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 13:36:07,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-21 13:36:07,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400. [2020-07-21 13:36:07,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 13:36:07,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions. [2020-07-21 13:36:07,977 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21 [2020-07-21 13:36:07,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:07,978 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 614 transitions. [2020-07-21 13:36:07,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:07,978 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions. [2020-07-21 13:36:07,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:36:07,982 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:07,982 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 13:36:08,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:08,196 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:08,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:08,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times [2020-07-21 13:36:08,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:08,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422419028] [2020-07-21 13:36:08,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:36:08,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:08,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:08,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:08,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:08,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:36:08,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:08,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422419028] [2020-07-21 13:36:08,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:08,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:08,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816340088] [2020-07-21 13:36:08,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:08,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:08,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:08,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:08,270 INFO L87 Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states. [2020-07-21 13:36:08,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:08,295 INFO L93 Difference]: Finished difference Result 708 states and 1104 transitions. [2020-07-21 13:36:08,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:08,296 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:36:08,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:08,301 INFO L225 Difference]: With dead ends: 708 [2020-07-21 13:36:08,301 INFO L226 Difference]: Without dead ends: 706 [2020-07-21 13:36:08,301 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 13:36:08,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2020-07-21 13:36:08,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 576. [2020-07-21 13:36:08,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 13:36:08,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 862 transitions. [2020-07-21 13:36:08,326 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 862 transitions. Word has length 22 [2020-07-21 13:36:08,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:08,327 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 862 transitions. [2020-07-21 13:36:08,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:08,327 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 862 transitions. [2020-07-21 13:36:08,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:36:08,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:08,329 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 13:36:08,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:08,542 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:08,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:08,542 INFO L82 PathProgramCache]: Analyzing trace with hash -764633433, now seen corresponding path program 1 times [2020-07-21 13:36:08,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:08,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706135585] [2020-07-21 13:36:08,544 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 13:36:08,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:08,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:08,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:08,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:08,595 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 13:36:08,596 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:08,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706135585] [2020-07-21 13:36:08,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:08,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:08,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037682432] [2020-07-21 13:36:08,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:08,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:08,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:08,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:08,601 INFO L87 Difference]: Start difference. First operand 576 states and 862 transitions. Second operand 3 states. [2020-07-21 13:36:08,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:08,638 INFO L93 Difference]: Finished difference Result 860 states and 1280 transitions. [2020-07-21 13:36:08,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:08,639 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:36:08,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:08,643 INFO L225 Difference]: With dead ends: 860 [2020-07-21 13:36:08,643 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 13:36:08,644 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 13:36:08,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 13:36:08,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-21 13:36:08,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 13:36:08,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions. [2020-07-21 13:36:08,664 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22 [2020-07-21 13:36:08,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:08,664 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 854 transitions. [2020-07-21 13:36:08,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:08,664 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions. [2020-07-21 13:36:08,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 13:36:08,666 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:08,666 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 13:36:08,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:08,880 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:08,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:08,881 INFO L82 PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times [2020-07-21 13:36:08,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:08,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [973570778] [2020-07-21 13:36:08,883 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 13:36:08,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:08,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:08,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:08,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:08,927 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 13:36:08,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:08,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [973570778] [2020-07-21 13:36:08,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:08,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:08,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455701232] [2020-07-21 13:36:08,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:08,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:08,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:08,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:08,930 INFO L87 Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states. [2020-07-21 13:36:08,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:08,960 INFO L93 Difference]: Finished difference Result 1340 states and 1960 transitions. [2020-07-21 13:36:08,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:08,961 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 13:36:08,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:08,966 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 13:36:08,966 INFO L226 Difference]: Without dead ends: 778 [2020-07-21 13:36:08,968 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 13:36:08,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2020-07-21 13:36:08,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776. [2020-07-21 13:36:08,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 13:36:08,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions. [2020-07-21 13:36:08,998 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22 [2020-07-21 13:36:08,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:08,999 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions. [2020-07-21 13:36:08,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:08,999 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions. [2020-07-21 13:36:09,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:36:09,001 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:09,001 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 13:36:09,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:09,216 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:09,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:09,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times [2020-07-21 13:36:09,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:09,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420703660] [2020-07-21 13:36:09,218 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 13:36:09,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:09,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:09,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:09,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:09,279 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 13:36:09,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:09,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420703660] [2020-07-21 13:36:09,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:09,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:09,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139021671] [2020-07-21 13:36:09,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:09,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:09,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:09,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:09,283 INFO L87 Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states. [2020-07-21 13:36:09,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:09,329 INFO L93 Difference]: Finished difference Result 1340 states and 1944 transitions. [2020-07-21 13:36:09,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:09,330 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:36:09,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:09,338 INFO L225 Difference]: With dead ends: 1340 [2020-07-21 13:36:09,339 INFO L226 Difference]: Without dead ends: 1338 [2020-07-21 13:36:09,342 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 13:36:09,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1338 states. [2020-07-21 13:36:09,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1338 to 1144. [2020-07-21 13:36:09,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1144 states. [2020-07-21 13:36:09,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1144 states to 1144 states and 1590 transitions. [2020-07-21 13:36:09,399 INFO L78 Accepts]: Start accepts. Automaton has 1144 states and 1590 transitions. Word has length 23 [2020-07-21 13:36:09,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:09,400 INFO L479 AbstractCegarLoop]: Abstraction has 1144 states and 1590 transitions. [2020-07-21 13:36:09,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:09,400 INFO L276 IsEmpty]: Start isEmpty. Operand 1144 states and 1590 transitions. [2020-07-21 13:36:09,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:36:09,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:09,404 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 13:36:09,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:09,618 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:09,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:09,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1922475871, now seen corresponding path program 1 times [2020-07-21 13:36:09,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:09,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042537114] [2020-07-21 13:36:09,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:36:09,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:09,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:09,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:09,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:09,663 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 13:36:09,664 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:09,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042537114] [2020-07-21 13:36:09,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:09,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:09,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928298042] [2020-07-21 13:36:09,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:09,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:09,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:09,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:09,666 INFO L87 Difference]: Start difference. First operand 1144 states and 1590 transitions. Second operand 3 states. [2020-07-21 13:36:09,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:09,696 INFO L93 Difference]: Finished difference Result 1708 states and 2360 transitions. [2020-07-21 13:36:09,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:09,697 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:36:09,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:09,704 INFO L225 Difference]: With dead ends: 1708 [2020-07-21 13:36:09,705 INFO L226 Difference]: Without dead ends: 1162 [2020-07-21 13:36:09,707 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 13:36:09,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1162 states. [2020-07-21 13:36:09,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1162 to 1160. [2020-07-21 13:36:09,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1160 states. [2020-07-21 13:36:09,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions. [2020-07-21 13:36:09,754 INFO L78 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23 [2020-07-21 13:36:09,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:09,754 INFO L479 AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions. [2020-07-21 13:36:09,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:09,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions. [2020-07-21 13:36:09,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 13:36:09,758 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:09,759 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 13:36:09,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:09,972 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:09,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:09,973 INFO L82 PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times [2020-07-21 13:36:09,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:09,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070035197] [2020-07-21 13:36:09,973 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 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 13:36:10,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:10,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:10,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:10,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:10,016 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 13:36:10,016 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:10,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070035197] [2020-07-21 13:36:10,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:10,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:10,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474092138] [2020-07-21 13:36:10,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:10,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:10,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:10,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:10,020 INFO L87 Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states. [2020-07-21 13:36:10,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:10,065 INFO L93 Difference]: Finished difference Result 2636 states and 3560 transitions. [2020-07-21 13:36:10,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:10,066 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 13:36:10,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:10,073 INFO L225 Difference]: With dead ends: 2636 [2020-07-21 13:36:10,074 INFO L226 Difference]: Without dead ends: 1514 [2020-07-21 13:36:10,077 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 13:36:10,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2020-07-21 13:36:10,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512. [2020-07-21 13:36:10,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1512 states. [2020-07-21 13:36:10,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions. [2020-07-21 13:36:10,140 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23 [2020-07-21 13:36:10,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:10,142 INFO L479 AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions. [2020-07-21 13:36:10,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:10,143 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions. [2020-07-21 13:36:10,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:36:10,146 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:10,146 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 13:36:10,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:10,360 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:10,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:10,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times [2020-07-21 13:36:10,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:10,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421702879] [2020-07-21 13:36:10,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:36:10,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:10,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:10,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:10,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:10,424 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 13:36:10,425 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:10,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421702879] [2020-07-21 13:36:10,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:10,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:10,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89139682] [2020-07-21 13:36:10,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:10,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:10,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:10,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:10,432 INFO L87 Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states. [2020-07-21 13:36:10,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:10,490 INFO L93 Difference]: Finished difference Result 2540 states and 3368 transitions. [2020-07-21 13:36:10,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:10,491 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:36:10,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:10,507 INFO L225 Difference]: With dead ends: 2540 [2020-07-21 13:36:10,508 INFO L226 Difference]: Without dead ends: 2538 [2020-07-21 13:36:10,509 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 13:36:10,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2538 states. [2020-07-21 13:36:10,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2538 to 2280. [2020-07-21 13:36:10,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2280 states. [2020-07-21 13:36:10,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2280 states to 2280 states and 2918 transitions. [2020-07-21 13:36:10,600 INFO L78 Accepts]: Start accepts. Automaton has 2280 states and 2918 transitions. Word has length 24 [2020-07-21 13:36:10,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:10,601 INFO L479 AbstractCegarLoop]: Abstraction has 2280 states and 2918 transitions. [2020-07-21 13:36:10,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:10,601 INFO L276 IsEmpty]: Start isEmpty. Operand 2280 states and 2918 transitions. [2020-07-21 13:36:10,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:36:10,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:10,606 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 13:36:10,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:10,821 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:10,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:10,822 INFO L82 PathProgramCache]: Analyzing trace with hash -676481284, now seen corresponding path program 1 times [2020-07-21 13:36:10,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:10,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703206671] [2020-07-21 13:36:10,822 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 13:36:10,870 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:10,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:10,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:10,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:10,879 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 13:36:10,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:10,880 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703206671] [2020-07-21 13:36:10,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:10,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:10,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697457474] [2020-07-21 13:36:10,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:10,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:10,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:10,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:10,882 INFO L87 Difference]: Start difference. First operand 2280 states and 2918 transitions. Second operand 3 states. [2020-07-21 13:36:10,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:10,929 INFO L93 Difference]: Finished difference Result 3404 states and 4328 transitions. [2020-07-21 13:36:10,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:10,930 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:36:10,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:10,943 INFO L225 Difference]: With dead ends: 3404 [2020-07-21 13:36:10,943 INFO L226 Difference]: Without dead ends: 2314 [2020-07-21 13:36:10,949 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 13:36:10,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2314 states. [2020-07-21 13:36:11,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2314 to 2312. [2020-07-21 13:36:11,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2312 states. [2020-07-21 13:36:11,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions. [2020-07-21 13:36:11,033 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24 [2020-07-21 13:36:11,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:11,033 INFO L479 AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions. [2020-07-21 13:36:11,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:11,033 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions. [2020-07-21 13:36:11,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 13:36:11,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:11,038 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 13:36:11,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:11,252 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:11,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:11,252 INFO L82 PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times [2020-07-21 13:36:11,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:11,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [552210869] [2020-07-21 13:36:11,253 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 13:36:11,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:11,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:11,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:11,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:11,309 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 13:36:11,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:11,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [552210869] [2020-07-21 13:36:11,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:11,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:11,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213837011] [2020-07-21 13:36:11,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:11,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:11,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:11,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:11,312 INFO L87 Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states. [2020-07-21 13:36:11,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:11,368 INFO L93 Difference]: Finished difference Result 5196 states and 6408 transitions. [2020-07-21 13:36:11,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:11,369 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 13:36:11,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:11,382 INFO L225 Difference]: With dead ends: 5196 [2020-07-21 13:36:11,382 INFO L226 Difference]: Without dead ends: 2954 [2020-07-21 13:36:11,387 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 13:36:11,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2954 states. [2020-07-21 13:36:11,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952. [2020-07-21 13:36:11,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2952 states. [2020-07-21 13:36:11,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions. [2020-07-21 13:36:11,499 INFO L78 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24 [2020-07-21 13:36:11,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:11,499 INFO L479 AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions. [2020-07-21 13:36:11,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:11,500 INFO L276 IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions. [2020-07-21 13:36:11,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:36:11,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:11,505 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 13:36:11,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:11,719 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:11,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:11,719 INFO L82 PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times [2020-07-21 13:36:11,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:11,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478678332] [2020-07-21 13:36:11,720 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 13:36:11,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:11,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:11,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:11,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 13:36:11,762 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:11,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478678332] [2020-07-21 13:36:11,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:11,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:11,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820241111] [2020-07-21 13:36:11,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:11,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:11,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:11,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:11,763 INFO L87 Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states. [2020-07-21 13:36:11,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:11,826 INFO L93 Difference]: Finished difference Result 4428 states and 5256 transitions. [2020-07-21 13:36:11,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:11,826 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:36:11,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:11,842 INFO L225 Difference]: With dead ends: 4428 [2020-07-21 13:36:11,842 INFO L226 Difference]: Without dead ends: 3018 [2020-07-21 13:36:11,847 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 13:36:11,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3018 states. [2020-07-21 13:36:11,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016. [2020-07-21 13:36:11,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 13:36:11,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions. [2020-07-21 13:36:11,951 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25 [2020-07-21 13:36:11,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:11,951 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions. [2020-07-21 13:36:11,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:11,951 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions. [2020-07-21 13:36:11,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:36:11,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:11,956 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 13:36:12,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:12,171 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:12,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:12,172 INFO L82 PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times [2020-07-21 13:36:12,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:12,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828734474] [2020-07-21 13:36:12,173 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 13:36:12,202 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:36:12,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:12,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:12,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:12,210 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 13:36:12,211 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:12,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828734474] [2020-07-21 13:36:12,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:12,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:12,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755834436] [2020-07-21 13:36:12,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:12,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:12,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:12,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:12,213 INFO L87 Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states. [2020-07-21 13:36:12,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:12,305 INFO L93 Difference]: Finished difference Result 8650 states and 9799 transitions. [2020-07-21 13:36:12,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:12,305 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:36:12,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:12,318 INFO L225 Difference]: With dead ends: 8650 [2020-07-21 13:36:12,318 INFO L226 Difference]: Without dead ends: 3016 [2020-07-21 13:36:12,329 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 13:36:12,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3016 states. [2020-07-21 13:36:12,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016. [2020-07-21 13:36:12,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3016 states. [2020-07-21 13:36:12,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions. [2020-07-21 13:36:12,419 INFO L78 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25 [2020-07-21 13:36:12,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:12,419 INFO L479 AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions. [2020-07-21 13:36:12,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:12,420 INFO L276 IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions. [2020-07-21 13:36:12,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:36:12,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:36:12,425 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 13:36:12,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:12,639 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:36:12,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:36:12,640 INFO L82 PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times [2020-07-21 13:36:12,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:36:12,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435401596] [2020-07-21 13:36:12,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:36:12,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:36:12,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:36:12,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:36:12,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:36:12,685 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 13:36:12,685 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:36:12,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435401596] [2020-07-21 13:36:12,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:36:12,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:36:12,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343885999] [2020-07-21 13:36:12,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:36:12,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:36:12,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:36:12,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:36:12,688 INFO L87 Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states. [2020-07-21 13:36:12,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:36:12,756 INFO L93 Difference]: Finished difference Result 3016 states and 3270 transitions. [2020-07-21 13:36:12,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:36:12,757 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 13:36:12,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:36:12,758 INFO L225 Difference]: With dead ends: 3016 [2020-07-21 13:36:12,758 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:36:12,763 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 13:36:12,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:36:12,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:36:12,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:36:12,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:36:12,765 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25 [2020-07-21 13:36:12,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:36:12,765 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:36:12,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:36:12,765 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:36:12,765 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:36:12,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:36:12,981 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:36:13,045 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:36:13,046 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:36:13,046 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:36:13,046 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:36:13,046 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:36:13,046 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:36:13,046 INFO L268 CegarLoopResult]: For program point L126(line 126) no Hoare annotation was computed. [2020-07-21 13:36:13,046 INFO L264 CegarLoopResult]: At program point L126-1(lines 5 135) the Hoare annotation is: false [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L60-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 135) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L110-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L111(line 111) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L95-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L120-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 135) no Hoare annotation was computed. [2020-07-21 13:36:13,047 INFO L268 CegarLoopResult]: For program point L96(line 96) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 135) the Hoare annotation is: true [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point L121(line 121) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point L80-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point L105-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point L72-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,048 INFO L268 CegarLoopResult]: For program point L64-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L56(lines 56 58) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L56-2(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L106(line 106) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L271 CegarLoopResult]: At program point L131(lines 5 135) the Hoare annotation is: true [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L90-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L115-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,049 INFO L268 CegarLoopResult]: For program point L91(line 91) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L116(line 116) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L100-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L271 CegarLoopResult]: At program point L125-1(lines 33 130) the Hoare annotation is: true [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L84-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L76-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L101(line 101) no Hoare annotation was computed. [2020-07-21 13:36:13,050 INFO L268 CegarLoopResult]: For program point L35(lines 35 37) no Hoare annotation was computed. [2020-07-21 13:36:13,051 INFO L268 CegarLoopResult]: For program point L68-1(lines 33 130) no Hoare annotation was computed. [2020-07-21 13:36:13,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:36:13 BoogieIcfgContainer [2020-07-21 13:36:13,064 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:36:13,068 INFO L168 Benchmark]: Toolchain (without parser) took 9721.01 ms. Allocated memory was 136.8 MB in the beginning and 288.4 MB in the end (delta: 151.5 MB). Free memory was 101.8 MB in the beginning and 243.3 MB in the end (delta: -141.5 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:13,068 INFO L168 Benchmark]: CDTParser took 0.61 ms. Allocated memory is still 136.8 MB. Free memory is still 119.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 13:36:13,069 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.91 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 90.9 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:13,069 INFO L168 Benchmark]: Boogie Preprocessor took 41.71 ms. Allocated memory is still 136.8 MB. Free memory was 90.9 MB in the beginning and 89.2 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:13,070 INFO L168 Benchmark]: RCFGBuilder took 478.38 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 89.2 MB in the beginning and 162.8 MB in the end (delta: -73.6 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:13,071 INFO L168 Benchmark]: TraceAbstraction took 8915.28 ms. Allocated memory was 201.9 MB in the beginning and 288.4 MB in the end (delta: 86.5 MB). Free memory was 162.8 MB in the beginning and 243.3 MB in the end (delta: -80.6 MB). Peak memory consumption was 5.9 MB. Max. memory is 7.1 GB. [2020-07-21 13:36:13,073 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.61 ms. Allocated memory is still 136.8 MB. Free memory is still 119.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 277.91 ms. Allocated memory is still 136.8 MB. Free memory was 101.4 MB in the beginning and 90.9 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 41.71 ms. Allocated memory is still 136.8 MB. Free memory was 90.9 MB in the beginning and 89.2 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 478.38 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 89.2 MB in the beginning and 162.8 MB in the end (delta: -73.6 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8915.28 ms. Allocated memory was 201.9 MB in the beginning and 288.4 MB in the end (delta: 86.5 MB). Free memory was 162.8 MB in the beginning and 243.3 MB in the end (delta: -80.6 MB). Peak memory consumption was 5.9 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: 8.7s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.2s, 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, 0.1s 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: 0.9s 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, 0.3s InterpolantComputationTime, 498 NumberOfCodeBlocks, 432 NumberOfCodeBlocksAsserted, 40 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2007 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...