/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_6.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:16:23,135 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:16:23,137 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:16:23,159 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:16:23,160 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:16:23,162 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:16:23,165 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:16:23,180 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:16:23,183 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:16:23,187 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:16:23,190 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:16:23,191 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:16:23,192 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:16:23,193 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:16:23,194 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:16:23,195 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:16:23,196 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:16:23,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:16:23,198 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:16:23,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:16:23,201 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:16:23,202 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:16:23,203 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:16:23,204 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:16:23,206 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:16:23,213 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:16:23,214 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:16:23,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:16:23,215 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:16:23,230 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:16:23,230 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:16:23,232 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:16:23,232 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:16:23,232 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:16:23,232 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:16:23,232 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:16:23,233 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:16:23,234 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:16:23,234 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:16:23,234 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:16:23,234 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:16:23,234 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:16:23,235 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:16:23,235 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:16:23,235 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:16:23,235 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:23,235 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:16:23,236 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:16:23,236 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:16:23,236 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:16:23,236 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:23,236 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:16:23,237 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:16:23,237 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:16:23,512 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:16:23,535 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:16:23,540 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:16:23,542 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:16:23,543 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:16:23,545 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_6.c [2020-07-21 16:16:23,631 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3fd6b683/2a210edfd76844aca1e75ab27ee37b6e/FLAG9657f88de [2020-07-21 16:16:24,081 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:16:24,084 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_6.c [2020-07-21 16:16:24,093 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3fd6b683/2a210edfd76844aca1e75ab27ee37b6e/FLAG9657f88de [2020-07-21 16:16:24,471 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f3fd6b683/2a210edfd76844aca1e75ab27ee37b6e [2020-07-21 16:16:24,482 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:16:24,485 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:16:24,486 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:24,486 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:16:24,490 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:16:24,491 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,496 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bd08649 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24, skipping insertion in model container [2020-07-21 16:16:24,496 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:16:24,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:16:24,739 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:24,743 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:16:24,765 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:16:24,778 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:16:24,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24 WrapperNode [2020-07-21 16:16:24,778 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:16:24,779 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:16:24,779 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:16:24,779 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:16:24,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,867 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,875 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,886 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,894 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... [2020-07-21 16:16:24,896 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:16:24,897 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:16:24,897 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:16:24,897 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:16:24,898 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:16:24,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:16:24,962 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:16:24,962 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:16:24,962 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:16:24,963 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:16:24,963 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:16:24,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:16:24,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:16:25,203 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:16:25,204 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:16:25,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:25 BoogieIcfgContainer [2020-07-21 16:16:25,208 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:16:25,210 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:16:25,210 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:16:25,213 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:16:25,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:16:24" (1/3) ... [2020-07-21 16:16:25,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303d38d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:25, skipping insertion in model container [2020-07-21 16:16:25,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:16:24" (2/3) ... [2020-07-21 16:16:25,215 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303d38d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:16:25, skipping insertion in model container [2020-07-21 16:16:25,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:16:25" (3/3) ... [2020-07-21 16:16:25,217 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_6.c [2020-07-21 16:16:25,228 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:16:25,236 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:16:25,253 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:16:25,289 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:16:25,290 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:16:25,290 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:16:25,290 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:16:25,290 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:16:25,290 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:16:25,291 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:16:25,291 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:16:25,316 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2020-07-21 16:16:25,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:16:25,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,324 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:25,325 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,332 INFO L82 PathProgramCache]: Analyzing trace with hash 429652513, now seen corresponding path program 1 times [2020-07-21 16:16:25,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975480638] [2020-07-21 16:16:25,342 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,433 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:25,489 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975480638] [2020-07-21 16:16:25,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637649136] [2020-07-21 16:16:25,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,518 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2020-07-21 16:16:25,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,573 INFO L93 Difference]: Finished difference Result 63 states and 102 transitions. [2020-07-21 16:16:25,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,576 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 16:16:25,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,588 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:16:25,589 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:16:25,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:16:25,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2020-07-21 16:16:25,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 16:16:25,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 57 transitions. [2020-07-21 16:16:25,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 57 transitions. Word has length 16 [2020-07-21 16:16:25,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,641 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 57 transitions. [2020-07-21 16:16:25,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 57 transitions. [2020-07-21 16:16:25,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:16:25,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,643 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:25,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,858 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:25,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:25,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1109710883, now seen corresponding path program 1 times [2020-07-21 16:16:25,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:25,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015968984] [2020-07-21 16:16:25,861 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:25,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:25,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:25,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:25,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:25,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:25,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:25,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015968984] [2020-07-21 16:16:25,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:25,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:25,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121942769] [2020-07-21 16:16:25,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:25,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:25,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:25,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,940 INFO L87 Difference]: Start difference. First operand 34 states and 57 transitions. Second operand 3 states. [2020-07-21 16:16:25,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:25,964 INFO L93 Difference]: Finished difference Result 77 states and 132 transitions. [2020-07-21 16:16:25,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:25,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2020-07-21 16:16:25,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:25,967 INFO L225 Difference]: With dead ends: 77 [2020-07-21 16:16:25,967 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:16:25,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:25,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:16:25,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-07-21 16:16:25,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 16:16:25,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 77 transitions. [2020-07-21 16:16:25,977 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 77 transitions. Word has length 16 [2020-07-21 16:16:25,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:25,978 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 77 transitions. [2020-07-21 16:16:25,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:25,978 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 77 transitions. [2020-07-21 16:16:25,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:25,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:25,979 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,196 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,197 INFO L82 PathProgramCache]: Analyzing trace with hash 434540691, now seen corresponding path program 1 times [2020-07-21 16:16:26,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628811164] [2020-07-21 16:16:26,198 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 16:16:26,254 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,275 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 16:16:26,276 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628811164] [2020-07-21 16:16:26,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120141509] [2020-07-21 16:16:26,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,281 INFO L87 Difference]: Start difference. First operand 46 states and 77 transitions. Second operand 3 states. [2020-07-21 16:16:26,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,311 INFO L93 Difference]: Finished difference Result 72 states and 117 transitions. [2020-07-21 16:16:26,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,312 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:26,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,314 INFO L225 Difference]: With dead ends: 72 [2020-07-21 16:16:26,314 INFO L226 Difference]: Without dead ends: 51 [2020-07-21 16:16:26,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-21 16:16:26,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2020-07-21 16:16:26,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 16:16:26,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 79 transitions. [2020-07-21 16:16:26,324 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 79 transitions. Word has length 17 [2020-07-21 16:16:26,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,324 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 79 transitions. [2020-07-21 16:16:26,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 79 transitions. [2020-07-21 16:16:26,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:26,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,326 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,530 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,531 INFO L82 PathProgramCache]: Analyzing trace with hash 41513681, now seen corresponding path program 1 times [2020-07-21 16:16:26,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993038963] [2020-07-21 16:16:26,532 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:26,599 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993038963] [2020-07-21 16:16:26,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074500682] [2020-07-21 16:16:26,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,605 INFO L87 Difference]: Start difference. First operand 49 states and 79 transitions. Second operand 3 states. [2020-07-21 16:16:26,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,635 INFO L93 Difference]: Finished difference Result 88 states and 144 transitions. [2020-07-21 16:16:26,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,638 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:26,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,639 INFO L225 Difference]: With dead ends: 88 [2020-07-21 16:16:26,640 INFO L226 Difference]: Without dead ends: 86 [2020-07-21 16:16:26,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-07-21 16:16:26,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 64. [2020-07-21 16:16:26,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 16:16:26,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 104 transitions. [2020-07-21 16:16:26,657 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 104 transitions. Word has length 17 [2020-07-21 16:16:26,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,658 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 104 transitions. [2020-07-21 16:16:26,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,658 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 104 transitions. [2020-07-21 16:16:26,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:16:26,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:26,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,874 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:26,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:26,874 INFO L82 PathProgramCache]: Analyzing trace with hash 721572051, now seen corresponding path program 1 times [2020-07-21 16:16:26,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:26,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162914285] [2020-07-21 16:16:26,875 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:26,910 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:26,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:26,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:26,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:26,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:26,923 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:26,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162914285] [2020-07-21 16:16:26,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:26,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:26,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568452694] [2020-07-21 16:16:26,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:26,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:26,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:26,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,926 INFO L87 Difference]: Start difference. First operand 64 states and 104 transitions. Second operand 3 states. [2020-07-21 16:16:26,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:26,954 INFO L93 Difference]: Finished difference Result 144 states and 238 transitions. [2020-07-21 16:16:26,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:26,955 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 16:16:26,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:26,956 INFO L225 Difference]: With dead ends: 144 [2020-07-21 16:16:26,957 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 16:16:26,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:26,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 16:16:26,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2020-07-21 16:16:26,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-21 16:16:26,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 138 transitions. [2020-07-21 16:16:26,971 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 138 transitions. Word has length 17 [2020-07-21 16:16:26,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:26,971 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 138 transitions. [2020-07-21 16:16:26,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:26,972 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 138 transitions. [2020-07-21 16:16:26,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:26,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:26,973 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:27,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,188 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:27,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:27,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1287139128, now seen corresponding path program 1 times [2020-07-21 16:16:27,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:27,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094645138] [2020-07-21 16:16:27,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:27,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:27,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:27,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:27,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:27,256 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:27,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094645138] [2020-07-21 16:16:27,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:27,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:27,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659417903] [2020-07-21 16:16:27,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:27,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:27,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:27,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,259 INFO L87 Difference]: Start difference. First operand 86 states and 138 transitions. Second operand 3 states. [2020-07-21 16:16:27,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:27,279 INFO L93 Difference]: Finished difference Result 129 states and 205 transitions. [2020-07-21 16:16:27,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:27,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:27,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:27,281 INFO L225 Difference]: With dead ends: 129 [2020-07-21 16:16:27,281 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 16:16:27,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 16:16:27,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2020-07-21 16:16:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-21 16:16:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 138 transitions. [2020-07-21 16:16:27,291 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 138 transitions. Word has length 18 [2020-07-21 16:16:27,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:27,291 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 138 transitions. [2020-07-21 16:16:27,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:27,292 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 138 transitions. [2020-07-21 16:16:27,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:27,293 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:27,293 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:27,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,507 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:27,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:27,508 INFO L82 PathProgramCache]: Analyzing trace with hash 894112118, now seen corresponding path program 1 times [2020-07-21 16:16:27,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:27,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820049226] [2020-07-21 16:16:27,509 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,542 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:27,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:27,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:27,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:27,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:27,556 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:27,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820049226] [2020-07-21 16:16:27,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:27,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:27,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271639139] [2020-07-21 16:16:27,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:27,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:27,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:27,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,558 INFO L87 Difference]: Start difference. First operand 88 states and 138 transitions. Second operand 3 states. [2020-07-21 16:16:27,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:27,580 INFO L93 Difference]: Finished difference Result 156 states and 248 transitions. [2020-07-21 16:16:27,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:27,580 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:27,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:27,582 INFO L225 Difference]: With dead ends: 156 [2020-07-21 16:16:27,582 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 16:16:27,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 16:16:27,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 120. [2020-07-21 16:16:27,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 16:16:27,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 186 transitions. [2020-07-21 16:16:27,595 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 186 transitions. Word has length 18 [2020-07-21 16:16:27,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:27,595 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 186 transitions. [2020-07-21 16:16:27,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:27,595 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 186 transitions. [2020-07-21 16:16:27,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 16:16:27,597 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:27,597 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:27,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,811 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:27,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:27,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1574170488, now seen corresponding path program 1 times [2020-07-21 16:16:27,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:27,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094153842] [2020-07-21 16:16:27,813 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:27,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:27,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:27,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:27,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:27,851 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:27,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:27,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094153842] [2020-07-21 16:16:27,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:27,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:27,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780460995] [2020-07-21 16:16:27,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:27,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:27,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:27,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,853 INFO L87 Difference]: Start difference. First operand 120 states and 186 transitions. Second operand 3 states. [2020-07-21 16:16:27,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:27,885 INFO L93 Difference]: Finished difference Result 272 states and 424 transitions. [2020-07-21 16:16:27,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:27,886 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 16:16:27,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:27,888 INFO L225 Difference]: With dead ends: 272 [2020-07-21 16:16:27,888 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 16:16:27,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:27,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 16:16:27,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2020-07-21 16:16:27,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 16:16:27,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 242 transitions. [2020-07-21 16:16:27,908 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 242 transitions. Word has length 18 [2020-07-21 16:16:27,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:27,909 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 242 transitions. [2020-07-21 16:16:27,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:27,909 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 242 transitions. [2020-07-21 16:16:27,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:27,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:27,910 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:28,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,121 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:28,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:28,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1947887240, now seen corresponding path program 1 times [2020-07-21 16:16:28,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:28,123 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418183238] [2020-07-21 16:16:28,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:28,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:28,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:28,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:28,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:28,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418183238] [2020-07-21 16:16:28,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:28,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:28,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652419034] [2020-07-21 16:16:28,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:28,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:28,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:28,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,172 INFO L87 Difference]: Start difference. First operand 160 states and 242 transitions. Second operand 3 states. [2020-07-21 16:16:28,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:28,216 INFO L93 Difference]: Finished difference Result 240 states and 360 transitions. [2020-07-21 16:16:28,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:28,217 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:28,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:28,218 INFO L225 Difference]: With dead ends: 240 [2020-07-21 16:16:28,219 INFO L226 Difference]: Without dead ends: 166 [2020-07-21 16:16:28,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-07-21 16:16:28,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2020-07-21 16:16:28,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-07-21 16:16:28,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 242 transitions. [2020-07-21 16:16:28,232 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 242 transitions. Word has length 19 [2020-07-21 16:16:28,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:28,232 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 242 transitions. [2020-07-21 16:16:28,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:28,232 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 242 transitions. [2020-07-21 16:16:28,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:28,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:28,234 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:28,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,449 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:28,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:28,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1554860230, now seen corresponding path program 1 times [2020-07-21 16:16:28,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:28,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85129263] [2020-07-21 16:16:28,452 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:28,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:28,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:28,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:28,487 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:28,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:28,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85129263] [2020-07-21 16:16:28,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:28,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:28,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532878536] [2020-07-21 16:16:28,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:28,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:28,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:28,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,491 INFO L87 Difference]: Start difference. First operand 164 states and 242 transitions. Second operand 3 states. [2020-07-21 16:16:28,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:28,524 INFO L93 Difference]: Finished difference Result 284 states and 424 transitions. [2020-07-21 16:16:28,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:28,532 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:28,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:28,535 INFO L225 Difference]: With dead ends: 284 [2020-07-21 16:16:28,535 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 16:16:28,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 16:16:28,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 232. [2020-07-21 16:16:28,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 16:16:28,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 334 transitions. [2020-07-21 16:16:28,551 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 334 transitions. Word has length 19 [2020-07-21 16:16:28,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:28,551 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 334 transitions. [2020-07-21 16:16:28,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:28,552 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 334 transitions. [2020-07-21 16:16:28,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:16:28,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:28,563 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:28,777 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,778 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:28,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:28,778 INFO L82 PathProgramCache]: Analyzing trace with hash -2060048696, now seen corresponding path program 1 times [2020-07-21 16:16:28,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:28,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [448358043] [2020-07-21 16:16:28,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:28,805 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:28,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:28,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:28,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:28,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:28,824 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:28,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [448358043] [2020-07-21 16:16:28,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:28,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:28,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451887652] [2020-07-21 16:16:28,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:28,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:28,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:28,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,826 INFO L87 Difference]: Start difference. First operand 232 states and 334 transitions. Second operand 3 states. [2020-07-21 16:16:28,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:28,855 INFO L93 Difference]: Finished difference Result 524 states and 752 transitions. [2020-07-21 16:16:28,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:28,856 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 16:16:28,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:28,858 INFO L225 Difference]: With dead ends: 524 [2020-07-21 16:16:28,858 INFO L226 Difference]: Without dead ends: 306 [2020-07-21 16:16:28,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:28,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-21 16:16:28,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 304. [2020-07-21 16:16:28,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 16:16:28,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 422 transitions. [2020-07-21 16:16:28,885 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 422 transitions. Word has length 19 [2020-07-21 16:16:28,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:28,885 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 422 transitions. [2020-07-21 16:16:28,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:28,886 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 422 transitions. [2020-07-21 16:16:28,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:28,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:28,887 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:29,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,102 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:29,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:29,103 INFO L82 PathProgramCache]: Analyzing trace with hash 956242573, now seen corresponding path program 1 times [2020-07-21 16:16:29,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:29,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [871054320] [2020-07-21 16:16:29,103 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:29,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:29,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:29,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:29,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:29,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:29,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [871054320] [2020-07-21 16:16:29,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:29,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:29,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417256454] [2020-07-21 16:16:29,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:29,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:29,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:29,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,146 INFO L87 Difference]: Start difference. First operand 304 states and 422 transitions. Second operand 3 states. [2020-07-21 16:16:29,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:29,166 INFO L93 Difference]: Finished difference Result 456 states and 628 transitions. [2020-07-21 16:16:29,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:29,167 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:29,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:29,170 INFO L225 Difference]: With dead ends: 456 [2020-07-21 16:16:29,170 INFO L226 Difference]: Without dead ends: 314 [2020-07-21 16:16:29,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-07-21 16:16:29,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 312. [2020-07-21 16:16:29,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2020-07-21 16:16:29,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 422 transitions. [2020-07-21 16:16:29,195 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 422 transitions. Word has length 20 [2020-07-21 16:16:29,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:29,196 INFO L479 AbstractCegarLoop]: Abstraction has 312 states and 422 transitions. [2020-07-21 16:16:29,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:29,196 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 422 transitions. [2020-07-21 16:16:29,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:29,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:29,198 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:29,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,412 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:29,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:29,413 INFO L82 PathProgramCache]: Analyzing trace with hash 563215563, now seen corresponding path program 1 times [2020-07-21 16:16:29,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:29,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372196626] [2020-07-21 16:16:29,414 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:29,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:29,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:29,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:29,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:29,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:29,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372196626] [2020-07-21 16:16:29,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:29,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:29,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767909455] [2020-07-21 16:16:29,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:29,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:29,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:29,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,454 INFO L87 Difference]: Start difference. First operand 312 states and 422 transitions. Second operand 3 states. [2020-07-21 16:16:29,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:29,486 INFO L93 Difference]: Finished difference Result 524 states and 712 transitions. [2020-07-21 16:16:29,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:29,487 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:29,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:29,490 INFO L225 Difference]: With dead ends: 524 [2020-07-21 16:16:29,490 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 16:16:29,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 16:16:29,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 456. [2020-07-21 16:16:29,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 456 states. [2020-07-21 16:16:29,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 598 transitions. [2020-07-21 16:16:29,509 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 598 transitions. Word has length 20 [2020-07-21 16:16:29,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:29,509 INFO L479 AbstractCegarLoop]: Abstraction has 456 states and 598 transitions. [2020-07-21 16:16:29,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:29,510 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 598 transitions. [2020-07-21 16:16:29,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 16:16:29,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:29,511 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:29,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,726 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:29,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:29,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1243273933, now seen corresponding path program 1 times [2020-07-21 16:16:29,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:29,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849042339] [2020-07-21 16:16:29,727 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:29,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:29,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:29,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:29,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:29,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:29,769 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:29,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849042339] [2020-07-21 16:16:29,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:29,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:29,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541013926] [2020-07-21 16:16:29,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:29,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:29,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:29,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,773 INFO L87 Difference]: Start difference. First operand 456 states and 598 transitions. Second operand 3 states. [2020-07-21 16:16:29,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:29,809 INFO L93 Difference]: Finished difference Result 1020 states and 1320 transitions. [2020-07-21 16:16:29,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:29,810 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 16:16:29,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:29,813 INFO L225 Difference]: With dead ends: 1020 [2020-07-21 16:16:29,814 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 16:16:29,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:29,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 16:16:29,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 584. [2020-07-21 16:16:29,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 584 states. [2020-07-21 16:16:29,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 726 transitions. [2020-07-21 16:16:29,835 INFO L78 Accepts]: Start accepts. Automaton has 584 states and 726 transitions. Word has length 20 [2020-07-21 16:16:29,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:29,835 INFO L479 AbstractCegarLoop]: Abstraction has 584 states and 726 transitions. [2020-07-21 16:16:29,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:29,836 INFO L276 IsEmpty]: Start isEmpty. Operand 584 states and 726 transitions. [2020-07-21 16:16:29,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:29,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:29,837 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:30,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,052 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:30,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:30,052 INFO L82 PathProgramCache]: Analyzing trace with hash 280029309, now seen corresponding path program 1 times [2020-07-21 16:16:30,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:30,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1026396578] [2020-07-21 16:16:30,053 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:30,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:30,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:30,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:30,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:30,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:30,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1026396578] [2020-07-21 16:16:30,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:30,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:30,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357069316] [2020-07-21 16:16:30,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:30,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:30,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:30,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,099 INFO L87 Difference]: Start difference. First operand 584 states and 726 transitions. Second operand 3 states. [2020-07-21 16:16:30,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:30,127 INFO L93 Difference]: Finished difference Result 876 states and 1080 transitions. [2020-07-21 16:16:30,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:30,128 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:30,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:30,133 INFO L225 Difference]: With dead ends: 876 [2020-07-21 16:16:30,133 INFO L226 Difference]: Without dead ends: 602 [2020-07-21 16:16:30,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2020-07-21 16:16:30,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 600. [2020-07-21 16:16:30,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 600 states. [2020-07-21 16:16:30,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 726 transitions. [2020-07-21 16:16:30,162 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 726 transitions. Word has length 21 [2020-07-21 16:16:30,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:30,163 INFO L479 AbstractCegarLoop]: Abstraction has 600 states and 726 transitions. [2020-07-21 16:16:30,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:30,164 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 726 transitions. [2020-07-21 16:16:30,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:30,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:30,166 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:30,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,380 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:30,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:30,381 INFO L82 PathProgramCache]: Analyzing trace with hash -112997701, now seen corresponding path program 1 times [2020-07-21 16:16:30,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:30,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363966351] [2020-07-21 16:16:30,382 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,415 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:30,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:30,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:30,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:30,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:30,423 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:30,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363966351] [2020-07-21 16:16:30,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:30,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:30,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721165849] [2020-07-21 16:16:30,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:30,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:30,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:30,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,432 INFO L87 Difference]: Start difference. First operand 600 states and 726 transitions. Second operand 3 states. [2020-07-21 16:16:30,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:30,472 INFO L93 Difference]: Finished difference Result 970 states and 1159 transitions. [2020-07-21 16:16:30,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:30,472 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:30,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:30,477 INFO L225 Difference]: With dead ends: 970 [2020-07-21 16:16:30,477 INFO L226 Difference]: Without dead ends: 968 [2020-07-21 16:16:30,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 968 states. [2020-07-21 16:16:30,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 968 to 904. [2020-07-21 16:16:30,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 904 states. [2020-07-21 16:16:30,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1062 transitions. [2020-07-21 16:16:30,506 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1062 transitions. Word has length 21 [2020-07-21 16:16:30,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:30,507 INFO L479 AbstractCegarLoop]: Abstraction has 904 states and 1062 transitions. [2020-07-21 16:16:30,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:30,507 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1062 transitions. [2020-07-21 16:16:30,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 16:16:30,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:16:30,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:16:30,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,723 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:16:30,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:16:30,723 INFO L82 PathProgramCache]: Analyzing trace with hash 567060669, now seen corresponding path program 1 times [2020-07-21 16:16:30,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:16:30,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573936926] [2020-07-21 16:16:30,725 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:30,767 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:16:30,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:16:30,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:16:30,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:16:30,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:16:30,775 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:16:30,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573936926] [2020-07-21 16:16:30,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:16:30,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:16:30,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315273623] [2020-07-21 16:16:30,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:16:30,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:16:30,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:16:30,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,777 INFO L87 Difference]: Start difference. First operand 904 states and 1062 transitions. Second operand 3 states. [2020-07-21 16:16:30,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:16:30,823 INFO L93 Difference]: Finished difference Result 1992 states and 2278 transitions. [2020-07-21 16:16:30,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:16:30,824 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 16:16:30,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:16:30,825 INFO L225 Difference]: With dead ends: 1992 [2020-07-21 16:16:30,825 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:16:30,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:16:30,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:16:30,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:16:30,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:16:30,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:16:30,833 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2020-07-21 16:16:30,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:16:30,834 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:16:30,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:16:30,834 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:16:30,834 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:16:31,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:16:31,053 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:16:31,127 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:16:31,127 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:31,127 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:16:31,127 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:16:31,127 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:16:31,128 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:16:31,128 INFO L268 CegarLoopResult]: For program point L93(line 93) no Hoare annotation was computed. [2020-07-21 16:16:31,128 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 107) no Hoare annotation was computed. [2020-07-21 16:16:31,128 INFO L268 CegarLoopResult]: For program point L77-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,128 INFO L268 CegarLoopResult]: For program point L78(line 78) no Hoare annotation was computed. [2020-07-21 16:16:31,128 INFO L271 CegarLoopResult]: At program point L103(lines 5 107) the Hoare annotation is: true [2020-07-21 16:16:31,129 INFO L268 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-07-21 16:16:31,129 INFO L268 CegarLoopResult]: For program point L62-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,130 INFO L268 CegarLoopResult]: For program point L87-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,130 INFO L268 CegarLoopResult]: For program point L54-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,130 INFO L268 CegarLoopResult]: For program point L46(lines 46 48) no Hoare annotation was computed. [2020-07-21 16:16:31,130 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 107) no Hoare annotation was computed. [2020-07-21 16:16:31,130 INFO L268 CegarLoopResult]: For program point L46-2(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,131 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 105) no Hoare annotation was computed. [2020-07-21 16:16:31,131 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 107) the Hoare annotation is: true [2020-07-21 16:16:31,131 INFO L268 CegarLoopResult]: For program point L88(line 88) no Hoare annotation was computed. [2020-07-21 16:16:31,131 INFO L268 CegarLoopResult]: For program point L72-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,131 INFO L271 CegarLoopResult]: At program point L97-1(lines 27 102) the Hoare annotation is: true [2020-07-21 16:16:31,132 INFO L268 CegarLoopResult]: For program point L73(line 73) no Hoare annotation was computed. [2020-07-21 16:16:31,132 INFO L268 CegarLoopResult]: For program point L98(line 98) no Hoare annotation was computed. [2020-07-21 16:16:31,132 INFO L264 CegarLoopResult]: At program point L98-1(lines 5 107) the Hoare annotation is: false [2020-07-21 16:16:31,132 INFO L268 CegarLoopResult]: For program point L82-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,132 INFO L268 CegarLoopResult]: For program point L66-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,132 INFO L268 CegarLoopResult]: For program point L58-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,134 INFO L268 CegarLoopResult]: For program point L83(line 83) no Hoare annotation was computed. [2020-07-21 16:16:31,134 INFO L268 CegarLoopResult]: For program point L50-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,134 INFO L268 CegarLoopResult]: For program point L92-1(lines 27 102) no Hoare annotation was computed. [2020-07-21 16:16:31,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:16:31 BoogieIcfgContainer [2020-07-21 16:16:31,152 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:16:31,156 INFO L168 Benchmark]: Toolchain (without parser) took 6671.03 ms. Allocated memory was 138.9 MB in the beginning and 245.4 MB in the end (delta: 106.4 MB). Free memory was 103.7 MB in the beginning and 138.4 MB in the end (delta: -34.6 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,157 INFO L168 Benchmark]: CDTParser took 0.56 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,158 INFO L168 Benchmark]: CACSL2BoogieTranslator took 292.22 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 93.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,159 INFO L168 Benchmark]: Boogie Preprocessor took 117.75 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.3 MB in the beginning and 180.5 MB in the end (delta: -87.2 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,160 INFO L168 Benchmark]: RCFGBuilder took 311.71 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 164.8 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,164 INFO L168 Benchmark]: TraceAbstraction took 5942.46 ms. Allocated memory was 202.4 MB in the beginning and 245.4 MB in the end (delta: 43.0 MB). Free memory was 164.2 MB in the beginning and 138.4 MB in the end (delta: 25.8 MB). Peak memory consumption was 68.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:16:31,173 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.56 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 292.22 ms. Allocated memory is still 138.9 MB. Free memory was 103.3 MB in the beginning and 93.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.75 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 93.3 MB in the beginning and 180.5 MB in the end (delta: -87.2 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 311.71 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 164.8 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5942.46 ms. Allocated memory was 202.4 MB in the beginning and 245.4 MB in the end (delta: 43.0 MB). Free memory was 164.2 MB in the beginning and 138.4 MB in the end (delta: 25.8 MB). Peak memory consumption was 68.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 105]: 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: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5.7s, OverallIterations: 17, TraceHistogramMax: 1, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 923 SDtfs, 417 SDslu, 612 SDs, 0 SdLazy, 91 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 300 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=904occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 17 MinimizatonAttempts, 270 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 74 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 317 NumberOfCodeBlocks, 317 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 300 ConstructedInterpolants, 0 QuantifiedInterpolants, 9690 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1268 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 17 InterpolantComputations, 17 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...