/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 DAGSIZE --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_7.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:53:22,283 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:53:22,286 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:53:22,302 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:53:22,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:53:22,304 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:53:22,312 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:53:22,314 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:53:22,317 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:53:22,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:53:22,325 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:53:22,329 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:53:22,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:53:22,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:53:22,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:53:22,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:53:22,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:53:22,336 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:53:22,338 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:53:22,341 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:53:22,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:53:22,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:53:22,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:53:22,347 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:53:22,350 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:53:22,360 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:53:22,361 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:53:22,362 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:53:22,363 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 19:53:22,381 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:53:22,382 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:53:22,384 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:53:22,384 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:53:22,384 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:53:22,384 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:53:22,385 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:53:22,385 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:53:22,385 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:53:22,385 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:53:22,386 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:53:22,386 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:53:22,386 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:53:22,386 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:53:22,387 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:53:22,387 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:53:22,387 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:53:22,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:53:22,388 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:53:22,388 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:53:22,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:53:22,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:53:22,388 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:53:22,389 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:53:22,389 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:53:22,389 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:53:22,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:22,390 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:53:22,390 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:53:22,390 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 -> DAGSIZE 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 19:53:22,732 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:53:22,756 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:53:22,765 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:53:22,767 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:53:22,771 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:53:22,774 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 19:53:22,886 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80133b042/010db5e25abd483983f4c70576aa68f4/FLAG4258ec97c [2020-07-21 19:53:23,577 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:53:23,578 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 19:53:23,590 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80133b042/010db5e25abd483983f4c70576aa68f4/FLAG4258ec97c [2020-07-21 19:53:23,910 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/80133b042/010db5e25abd483983f4c70576aa68f4 [2020-07-21 19:53:23,923 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:53:23,927 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:53:23,929 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:23,929 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:53:23,934 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:53:23,936 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:23" (1/1) ... [2020-07-21 19:53:23,940 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@227c722b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:23, skipping insertion in model container [2020-07-21 19:53:23,941 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:53:23" (1/1) ... [2020-07-21 19:53:23,951 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:53:23,978 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:53:24,196 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:24,204 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:53:24,231 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:53:24,252 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:53:24,253 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24 WrapperNode [2020-07-21 19:53:24,253 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:53:24,254 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:53:24,255 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:53:24,255 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:53:24,275 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,275 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,284 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,285 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,416 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (1/1) ... [2020-07-21 19:53:24,422 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:53:24,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:53:24,430 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:53:24,430 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:53:24,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (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 19:53:24,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:53:24,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:53:24,509 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:53:24,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:53:24,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:53:24,509 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:53:24,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:53:24,510 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:53:24,869 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:53:24,870 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 19:53:24,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:24 BoogieIcfgContainer [2020-07-21 19:53:24,879 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:53:24,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:53:24,881 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:53:24,887 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:53:24,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:53:23" (1/3) ... [2020-07-21 19:53:24,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ae54632 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:24, skipping insertion in model container [2020-07-21 19:53:24,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:53:24" (2/3) ... [2020-07-21 19:53:24,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ae54632 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:53:24, skipping insertion in model container [2020-07-21 19:53:24,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:53:24" (3/3) ... [2020-07-21 19:53:24,894 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-07-21 19:53:24,912 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:53:24,923 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:53:24,943 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:53:24,983 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:53:24,984 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:53:24,984 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:53:24,984 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:53:24,984 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:53:24,985 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:53:24,985 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:53:24,985 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:53:25,011 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 19:53:25,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:53:25,020 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:25,022 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 19:53:25,022 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:25,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:25,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1819770524, now seen corresponding path program 1 times [2020-07-21 19:53:25,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:25,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562662550] [2020-07-21 19:53:25,049 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 19:53:25,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:25,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:25,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:25,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:25,258 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 19:53:25,259 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:25,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562662550] [2020-07-21 19:53:25,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:25,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:25,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879411088] [2020-07-21 19:53:25,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:25,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:25,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:25,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:25,288 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-07-21 19:53:25,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:25,376 INFO L93 Difference]: Finished difference Result 69 states and 114 transitions. [2020-07-21 19:53:25,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:25,379 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 19:53:25,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:25,395 INFO L225 Difference]: With dead ends: 69 [2020-07-21 19:53:25,395 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 19:53:25,401 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 19:53:25,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 19:53:25,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2020-07-21 19:53:25,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 19:53:25,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 65 transitions. [2020-07-21 19:53:25,468 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 65 transitions. Word has length 17 [2020-07-21 19:53:25,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:25,469 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 65 transitions. [2020-07-21 19:53:25,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:25,470 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 65 transitions. [2020-07-21 19:53:25,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 19:53:25,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:25,472 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 19:53:25,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:25,687 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:25,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:25,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1426743514, now seen corresponding path program 1 times [2020-07-21 19:53:25,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:25,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255745977] [2020-07-21 19:53:25,690 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 19:53:25,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:25,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:25,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:25,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:25,765 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 19:53:25,766 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:25,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255745977] [2020-07-21 19:53:25,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:25,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:25,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450415891] [2020-07-21 19:53:25,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:25,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:25,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:25,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:25,773 INFO L87 Difference]: Start difference. First operand 38 states and 65 transitions. Second operand 3 states. [2020-07-21 19:53:25,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:25,811 INFO L93 Difference]: Finished difference Result 87 states and 152 transitions. [2020-07-21 19:53:25,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:25,813 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 19:53:25,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:25,815 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:53:25,815 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 19:53:25,817 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 19:53:25,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 19:53:25,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-07-21 19:53:25,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 19:53:25,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 89 transitions. [2020-07-21 19:53:25,831 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 89 transitions. Word has length 17 [2020-07-21 19:53:25,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:25,832 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 89 transitions. [2020-07-21 19:53:25,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:25,833 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 89 transitions. [2020-07-21 19:53:25,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:25,834 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:25,834 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 19:53:26,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:26,048 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:26,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:26,049 INFO L82 PathProgramCache]: Analyzing trace with hash 578525748, now seen corresponding path program 1 times [2020-07-21 19:53:26,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:26,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611487368] [2020-07-21 19:53:26,051 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 19:53:26,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:26,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:26,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:26,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:26,171 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 19:53:26,171 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:26,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611487368] [2020-07-21 19:53:26,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:26,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:26,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413936188] [2020-07-21 19:53:26,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:26,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:26,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:26,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:26,177 INFO L87 Difference]: Start difference. First operand 52 states and 89 transitions. Second operand 3 states. [2020-07-21 19:53:26,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:26,229 INFO L93 Difference]: Finished difference Result 81 states and 135 transitions. [2020-07-21 19:53:26,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:26,231 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:26,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:26,232 INFO L225 Difference]: With dead ends: 81 [2020-07-21 19:53:26,232 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 19:53:26,233 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 19:53:26,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 19:53:26,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 19:53:26,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:53:26,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 91 transitions. [2020-07-21 19:53:26,250 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 91 transitions. Word has length 18 [2020-07-21 19:53:26,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:26,251 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 91 transitions. [2020-07-21 19:53:26,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:26,251 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 91 transitions. [2020-07-21 19:53:26,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:26,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:26,252 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 19:53:26,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:26,454 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:26,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:26,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1279590326, now seen corresponding path program 1 times [2020-07-21 19:53:26,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:26,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586006216] [2020-07-21 19:53:26,457 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 19:53:26,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:26,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:26,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:26,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:26,543 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 19:53:26,546 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:26,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586006216] [2020-07-21 19:53:26,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:26,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:26,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553154750] [2020-07-21 19:53:26,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:26,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:26,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:26,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:26,549 INFO L87 Difference]: Start difference. First operand 55 states and 91 transitions. Second operand 3 states. [2020-07-21 19:53:26,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:26,590 INFO L93 Difference]: Finished difference Result 100 states and 168 transitions. [2020-07-21 19:53:26,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:26,591 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:26,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:26,594 INFO L225 Difference]: With dead ends: 100 [2020-07-21 19:53:26,595 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 19:53:26,596 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 19:53:26,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 19:53:26,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 72. [2020-07-21 19:53:26,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 19:53:26,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 120 transitions. [2020-07-21 19:53:26,609 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 120 transitions. Word has length 18 [2020-07-21 19:53:26,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:26,609 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 120 transitions. [2020-07-21 19:53:26,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:26,610 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 120 transitions. [2020-07-21 19:53:26,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 19:53:26,612 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:26,612 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 19:53:26,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:26,819 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:26,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:26,820 INFO L82 PathProgramCache]: Analyzing trace with hash 886563316, now seen corresponding path program 1 times [2020-07-21 19:53:26,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:26,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170367783] [2020-07-21 19:53:26,822 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:53:26,869 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:26,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:26,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:26,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:26,893 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 19:53:26,894 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:26,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170367783] [2020-07-21 19:53:26,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:26,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:26,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398351624] [2020-07-21 19:53:26,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:26,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:26,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:26,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:26,897 INFO L87 Difference]: Start difference. First operand 72 states and 120 transitions. Second operand 3 states. [2020-07-21 19:53:26,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:26,934 INFO L93 Difference]: Finished difference Result 164 states and 278 transitions. [2020-07-21 19:53:26,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:26,935 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 19:53:26,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:26,937 INFO L225 Difference]: With dead ends: 164 [2020-07-21 19:53:26,937 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 19:53:26,938 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 19:53:26,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 19:53:26,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-07-21 19:53:26,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 19:53:26,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 162 transitions. [2020-07-21 19:53:26,968 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 162 transitions. Word has length 18 [2020-07-21 19:53:26,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:26,968 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 162 transitions. [2020-07-21 19:53:26,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:26,968 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 162 transitions. [2020-07-21 19:53:26,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:26,970 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:26,970 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 19:53:27,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:27,174 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:27,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:27,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1012809135, now seen corresponding path program 1 times [2020-07-21 19:53:27,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:27,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048382555] [2020-07-21 19:53:27,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:53:27,221 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:27,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:27,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:27,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:27,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:27,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:27,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048382555] [2020-07-21 19:53:27,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:27,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:27,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773406200] [2020-07-21 19:53:27,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:27,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:27,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:27,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:27,241 INFO L87 Difference]: Start difference. First operand 98 states and 162 transitions. Second operand 3 states. [2020-07-21 19:53:27,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:27,279 INFO L93 Difference]: Finished difference Result 147 states and 241 transitions. [2020-07-21 19:53:27,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:27,279 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:27,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:27,281 INFO L225 Difference]: With dead ends: 147 [2020-07-21 19:53:27,281 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 19:53:27,287 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 19:53:27,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 19:53:27,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-07-21 19:53:27,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 19:53:27,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 162 transitions. [2020-07-21 19:53:27,310 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 162 transitions. Word has length 19 [2020-07-21 19:53:27,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:27,311 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 162 transitions. [2020-07-21 19:53:27,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:27,311 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 162 transitions. [2020-07-21 19:53:27,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:27,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:27,317 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 19:53:27,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:27,533 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:27,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:27,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1713873713, now seen corresponding path program 1 times [2020-07-21 19:53:27,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:27,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282548552] [2020-07-21 19:53:27,536 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 19:53:27,583 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:27,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:27,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:27,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:27,612 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 19:53:27,613 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:27,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282548552] [2020-07-21 19:53:27,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:27,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:27,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542876848] [2020-07-21 19:53:27,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:27,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:27,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:27,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:27,617 INFO L87 Difference]: Start difference. First operand 100 states and 162 transitions. Second operand 3 states. [2020-07-21 19:53:27,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:27,634 INFO L93 Difference]: Finished difference Result 180 states and 296 transitions. [2020-07-21 19:53:27,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:27,635 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:27,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:27,637 INFO L225 Difference]: With dead ends: 180 [2020-07-21 19:53:27,637 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 19:53:27,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:27,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 19:53:27,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 136. [2020-07-21 19:53:27,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 19:53:27,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 218 transitions. [2020-07-21 19:53:27,653 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 218 transitions. Word has length 19 [2020-07-21 19:53:27,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:27,653 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 218 transitions. [2020-07-21 19:53:27,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:27,654 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 218 transitions. [2020-07-21 19:53:27,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 19:53:27,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:27,656 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 19:53:27,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:27,871 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:27,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:27,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1320846703, now seen corresponding path program 1 times [2020-07-21 19:53:27,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:27,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1408869594] [2020-07-21 19:53:27,873 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 19:53:27,923 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:27,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:27,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:27,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:27,937 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 19:53:27,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:27,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1408869594] [2020-07-21 19:53:27,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:27,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:27,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176812962] [2020-07-21 19:53:27,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:27,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:27,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:27,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:27,941 INFO L87 Difference]: Start difference. First operand 136 states and 218 transitions. Second operand 3 states. [2020-07-21 19:53:27,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:27,972 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 19:53:27,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:27,973 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 19:53:27,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:27,974 INFO L225 Difference]: With dead ends: 312 [2020-07-21 19:53:27,974 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 19:53:27,976 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 19:53:27,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 19:53:27,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-21 19:53:27,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 19:53:27,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 290 transitions. [2020-07-21 19:53:27,990 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 290 transitions. Word has length 19 [2020-07-21 19:53:27,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:27,990 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 290 transitions. [2020-07-21 19:53:27,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:27,991 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 290 transitions. [2020-07-21 19:53:27,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:27,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:27,993 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 19:53:28,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:28,209 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:28,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:28,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1590692585, now seen corresponding path program 1 times [2020-07-21 19:53:28,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:28,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888519830] [2020-07-21 19:53:28,211 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 19:53:28,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:28,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:28,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:28,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:28,265 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 19:53:28,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:28,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888519830] [2020-07-21 19:53:28,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:28,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:28,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869556574] [2020-07-21 19:53:28,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:28,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:28,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:28,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:28,272 INFO L87 Difference]: Start difference. First operand 184 states and 290 transitions. Second operand 3 states. [2020-07-21 19:53:28,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:28,303 INFO L93 Difference]: Finished difference Result 328 states and 524 transitions. [2020-07-21 19:53:28,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:28,303 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:28,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:28,306 INFO L225 Difference]: With dead ends: 328 [2020-07-21 19:53:28,306 INFO L226 Difference]: Without dead ends: 326 [2020-07-21 19:53:28,307 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 19:53:28,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2020-07-21 19:53:28,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 260. [2020-07-21 19:53:28,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-21 19:53:28,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 402 transitions. [2020-07-21 19:53:28,325 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 402 transitions. Word has length 20 [2020-07-21 19:53:28,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:28,325 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 402 transitions. [2020-07-21 19:53:28,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:28,325 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 402 transitions. [2020-07-21 19:53:28,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:28,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:28,328 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 19:53:28,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:28,543 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:28,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:28,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1197665575, now seen corresponding path program 1 times [2020-07-21 19:53:28,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:28,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133994247] [2020-07-21 19:53:28,545 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 19:53:28,586 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:28,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:28,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:28,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:28,601 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 19:53:28,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:28,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133994247] [2020-07-21 19:53:28,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:28,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:28,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880626340] [2020-07-21 19:53:28,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:28,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:28,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:28,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:28,604 INFO L87 Difference]: Start difference. First operand 260 states and 402 transitions. Second operand 3 states. [2020-07-21 19:53:28,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:28,634 INFO L93 Difference]: Finished difference Result 388 states and 596 transitions. [2020-07-21 19:53:28,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:28,634 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:28,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:28,637 INFO L225 Difference]: With dead ends: 388 [2020-07-21 19:53:28,637 INFO L226 Difference]: Without dead ends: 266 [2020-07-21 19:53:28,638 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 19:53:28,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-21 19:53:28,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 264. [2020-07-21 19:53:28,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 19:53:28,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 398 transitions. [2020-07-21 19:53:28,652 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 398 transitions. Word has length 20 [2020-07-21 19:53:28,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:28,652 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 398 transitions. [2020-07-21 19:53:28,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:28,652 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 398 transitions. [2020-07-21 19:53:28,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 19:53:28,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:28,655 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 19:53:28,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:28,870 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:28,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:28,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1898730153, now seen corresponding path program 1 times [2020-07-21 19:53:28,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:28,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373091898] [2020-07-21 19:53:28,871 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 19:53:28,913 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:28,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:28,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:28,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:28,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:53:28,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:28,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373091898] [2020-07-21 19:53:28,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:28,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:28,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990450546] [2020-07-21 19:53:28,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:28,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:28,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:28,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:28,931 INFO L87 Difference]: Start difference. First operand 264 states and 398 transitions. Second operand 3 states. [2020-07-21 19:53:28,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:28,967 INFO L93 Difference]: Finished difference Result 604 states and 912 transitions. [2020-07-21 19:53:28,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:28,968 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 19:53:28,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:28,972 INFO L225 Difference]: With dead ends: 604 [2020-07-21 19:53:28,972 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 19:53:28,974 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 19:53:28,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 19:53:28,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 352. [2020-07-21 19:53:28,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 19:53:28,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 518 transitions. [2020-07-21 19:53:28,993 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 518 transitions. Word has length 20 [2020-07-21 19:53:28,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:28,993 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 518 transitions. [2020-07-21 19:53:28,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:28,994 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 518 transitions. [2020-07-21 19:53:28,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:28,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:28,996 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 19:53:29,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:29,210 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:29,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:29,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1969756604, now seen corresponding path program 1 times [2020-07-21 19:53:29,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:29,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290184807] [2020-07-21 19:53:29,213 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 19:53:29,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:29,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:29,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:29,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:29,302 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 19:53:29,303 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:29,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290184807] [2020-07-21 19:53:29,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:29,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:29,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690405982] [2020-07-21 19:53:29,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:29,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:29,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:29,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:29,306 INFO L87 Difference]: Start difference. First operand 352 states and 518 transitions. Second operand 3 states. [2020-07-21 19:53:29,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:29,340 INFO L93 Difference]: Finished difference Result 612 states and 912 transitions. [2020-07-21 19:53:29,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:29,341 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:29,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:29,346 INFO L225 Difference]: With dead ends: 612 [2020-07-21 19:53:29,347 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 19:53:29,348 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 19:53:29,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 19:53:29,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 512. [2020-07-21 19:53:29,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 512 states. [2020-07-21 19:53:29,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 734 transitions. [2020-07-21 19:53:29,379 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 734 transitions. Word has length 21 [2020-07-21 19:53:29,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:29,382 INFO L479 AbstractCegarLoop]: Abstraction has 512 states and 734 transitions. [2020-07-21 19:53:29,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:29,382 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 734 transitions. [2020-07-21 19:53:29,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:29,387 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:29,387 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 19:53:29,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:29,589 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:29,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:29,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1932183682, now seen corresponding path program 1 times [2020-07-21 19:53:29,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:29,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759105091] [2020-07-21 19:53:29,592 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 19:53:29,628 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:29,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:29,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:29,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:29,648 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 19:53:29,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:29,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759105091] [2020-07-21 19:53:29,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:29,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:29,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015874343] [2020-07-21 19:53:29,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:29,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:29,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:29,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:29,652 INFO L87 Difference]: Start difference. First operand 512 states and 734 transitions. Second operand 3 states. [2020-07-21 19:53:29,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:29,680 INFO L93 Difference]: Finished difference Result 764 states and 1088 transitions. [2020-07-21 19:53:29,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:29,681 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:29,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:29,685 INFO L225 Difference]: With dead ends: 764 [2020-07-21 19:53:29,685 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 19:53:29,686 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 19:53:29,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 19:53:29,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 520. [2020-07-21 19:53:29,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 520 states. [2020-07-21 19:53:29,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 726 transitions. [2020-07-21 19:53:29,714 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 726 transitions. Word has length 21 [2020-07-21 19:53:29,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:29,715 INFO L479 AbstractCegarLoop]: Abstraction has 520 states and 726 transitions. [2020-07-21 19:53:29,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:29,716 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 726 transitions. [2020-07-21 19:53:29,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 19:53:29,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:29,718 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 19:53:29,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:29,934 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:29,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:29,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1661719036, now seen corresponding path program 1 times [2020-07-21 19:53:29,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:29,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176297132] [2020-07-21 19:53:29,937 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 19:53:29,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:29,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:29,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:29,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:30,007 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 19:53:30,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:30,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176297132] [2020-07-21 19:53:30,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:30,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:30,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726380066] [2020-07-21 19:53:30,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:30,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:30,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:30,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:30,012 INFO L87 Difference]: Start difference. First operand 520 states and 726 transitions. Second operand 3 states. [2020-07-21 19:53:30,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:30,051 INFO L93 Difference]: Finished difference Result 1180 states and 1640 transitions. [2020-07-21 19:53:30,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:30,052 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 19:53:30,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:30,056 INFO L225 Difference]: With dead ends: 1180 [2020-07-21 19:53:30,057 INFO L226 Difference]: Without dead ends: 682 [2020-07-21 19:53:30,060 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 19:53:30,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2020-07-21 19:53:30,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 680. [2020-07-21 19:53:30,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-21 19:53:30,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 918 transitions. [2020-07-21 19:53:30,089 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 918 transitions. Word has length 21 [2020-07-21 19:53:30,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:30,089 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 918 transitions. [2020-07-21 19:53:30,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:30,090 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 918 transitions. [2020-07-21 19:53:30,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:30,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:30,092 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:30,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:30,308 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:30,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:30,309 INFO L82 PathProgramCache]: Analyzing trace with hash -674531426, now seen corresponding path program 1 times [2020-07-21 19:53:30,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:30,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200361396] [2020-07-21 19:53:30,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:53:30,352 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:30,352 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:30,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:30,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:30,377 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 19:53:30,378 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:30,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200361396] [2020-07-21 19:53:30,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:30,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:30,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882404769] [2020-07-21 19:53:30,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:30,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:30,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:30,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:30,382 INFO L87 Difference]: Start difference. First operand 680 states and 918 transitions. Second operand 3 states. [2020-07-21 19:53:30,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:30,430 INFO L93 Difference]: Finished difference Result 1148 states and 1560 transitions. [2020-07-21 19:53:30,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:30,431 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:30,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:30,440 INFO L225 Difference]: With dead ends: 1148 [2020-07-21 19:53:30,441 INFO L226 Difference]: Without dead ends: 1146 [2020-07-21 19:53:30,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:30,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1146 states. [2020-07-21 19:53:30,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1146 to 1016. [2020-07-21 19:53:30,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1016 states. [2020-07-21 19:53:30,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1016 states to 1016 states and 1334 transitions. [2020-07-21 19:53:30,500 INFO L78 Accepts]: Start accepts. Automaton has 1016 states and 1334 transitions. Word has length 22 [2020-07-21 19:53:30,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:30,501 INFO L479 AbstractCegarLoop]: Abstraction has 1016 states and 1334 transitions. [2020-07-21 19:53:30,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:30,502 INFO L276 IsEmpty]: Start isEmpty. Operand 1016 states and 1334 transitions. [2020-07-21 19:53:30,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:30,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:30,505 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:30,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:30,720 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:30,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:30,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1067558436, now seen corresponding path program 1 times [2020-07-21 19:53:30,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:30,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847538916] [2020-07-21 19:53:30,722 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 19:53:30,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:30,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:30,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:30,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:30,799 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 19:53:30,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:30,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847538916] [2020-07-21 19:53:30,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:30,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:30,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906194516] [2020-07-21 19:53:30,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:30,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:30,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:30,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:30,811 INFO L87 Difference]: Start difference. First operand 1016 states and 1334 transitions. Second operand 3 states. [2020-07-21 19:53:30,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:30,857 INFO L93 Difference]: Finished difference Result 1516 states and 1976 transitions. [2020-07-21 19:53:30,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:30,858 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:30,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:30,866 INFO L225 Difference]: With dead ends: 1516 [2020-07-21 19:53:30,867 INFO L226 Difference]: Without dead ends: 1034 [2020-07-21 19:53:30,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:30,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1034 states. [2020-07-21 19:53:30,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1034 to 1032. [2020-07-21 19:53:30,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1032 states. [2020-07-21 19:53:30,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1318 transitions. [2020-07-21 19:53:30,919 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1318 transitions. Word has length 22 [2020-07-21 19:53:30,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:30,920 INFO L479 AbstractCegarLoop]: Abstraction has 1032 states and 1318 transitions. [2020-07-21 19:53:30,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:30,921 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1318 transitions. [2020-07-21 19:53:30,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 19:53:30,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:30,924 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:31,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:31,138 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:31,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:31,139 INFO L82 PathProgramCache]: Analyzing trace with hash -366493858, now seen corresponding path program 1 times [2020-07-21 19:53:31,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:31,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120074369] [2020-07-21 19:53:31,140 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 19:53:31,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:53:31,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:31,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:31,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:31,212 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 19:53:31,212 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:31,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120074369] [2020-07-21 19:53:31,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:31,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:31,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307324423] [2020-07-21 19:53:31,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:31,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:31,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:31,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:31,215 INFO L87 Difference]: Start difference. First operand 1032 states and 1318 transitions. Second operand 3 states. [2020-07-21 19:53:31,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:31,263 INFO L93 Difference]: Finished difference Result 2316 states and 2920 transitions. [2020-07-21 19:53:31,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:31,264 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 19:53:31,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:31,274 INFO L225 Difference]: With dead ends: 2316 [2020-07-21 19:53:31,274 INFO L226 Difference]: Without dead ends: 1322 [2020-07-21 19:53:31,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:31,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2020-07-21 19:53:31,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1320. [2020-07-21 19:53:31,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1320 states. [2020-07-21 19:53:31,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1606 transitions. [2020-07-21 19:53:31,333 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1606 transitions. Word has length 22 [2020-07-21 19:53:31,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:31,334 INFO L479 AbstractCegarLoop]: Abstraction has 1320 states and 1606 transitions. [2020-07-21 19:53:31,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:31,334 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1606 transitions. [2020-07-21 19:53:31,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:53:31,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:31,337 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:31,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:31,553 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:31,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:31,555 INFO L82 PathProgramCache]: Analyzing trace with hash 822743769, now seen corresponding path program 1 times [2020-07-21 19:53:31,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:31,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1910852550] [2020-07-21 19:53:31,556 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:31,592 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:31,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:31,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:31,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:31,608 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 19:53:31,608 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:31,609 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1910852550] [2020-07-21 19:53:31,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:31,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:31,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284271170] [2020-07-21 19:53:31,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:31,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:31,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:31,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:31,611 INFO L87 Difference]: Start difference. First operand 1320 states and 1606 transitions. Second operand 3 states. [2020-07-21 19:53:31,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:31,691 INFO L93 Difference]: Finished difference Result 2154 states and 2599 transitions. [2020-07-21 19:53:31,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:31,692 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:53:31,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:31,704 INFO L225 Difference]: With dead ends: 2154 [2020-07-21 19:53:31,704 INFO L226 Difference]: Without dead ends: 2152 [2020-07-21 19:53:31,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:31,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2152 states. [2020-07-21 19:53:31,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2152 to 2024. [2020-07-21 19:53:31,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2024 states. [2020-07-21 19:53:31,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2024 states to 2024 states and 2406 transitions. [2020-07-21 19:53:31,788 INFO L78 Accepts]: Start accepts. Automaton has 2024 states and 2406 transitions. Word has length 23 [2020-07-21 19:53:31,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:31,789 INFO L479 AbstractCegarLoop]: Abstraction has 2024 states and 2406 transitions. [2020-07-21 19:53:31,789 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:31,789 INFO L276 IsEmpty]: Start isEmpty. Operand 2024 states and 2406 transitions. [2020-07-21 19:53:31,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 19:53:31,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:53:31,795 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:53:32,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:32,010 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:53:32,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:53:32,011 INFO L82 PathProgramCache]: Analyzing trace with hash 429716759, now seen corresponding path program 1 times [2020-07-21 19:53:32,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:53:32,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642974832] [2020-07-21 19:53:32,013 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:32,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:53:32,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:53:32,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:53:32,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:53:32,070 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 19:53:32,071 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:53:32,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642974832] [2020-07-21 19:53:32,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:53:32,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 19:53:32,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15531235] [2020-07-21 19:53:32,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 19:53:32,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:53:32,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 19:53:32,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,073 INFO L87 Difference]: Start difference. First operand 2024 states and 2406 transitions. Second operand 3 states. [2020-07-21 19:53:32,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:53:32,159 INFO L93 Difference]: Finished difference Result 4520 states and 5286 transitions. [2020-07-21 19:53:32,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 19:53:32,160 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 19:53:32,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:53:32,161 INFO L225 Difference]: With dead ends: 4520 [2020-07-21 19:53:32,161 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:53:32,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 19:53:32,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:53:32,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:53:32,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:53:32,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:53:32,173 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-07-21 19:53:32,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:53:32,174 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:53:32,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 19:53:32,174 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:53:32,174 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:53:32,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:53:32,391 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:53:32,483 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:53:32,483 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:32,484 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:53:32,484 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:53:32,484 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:53:32,484 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:53:32,484 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 121) no Hoare annotation was computed. [2020-07-21 19:53:32,484 INFO L268 CegarLoopResult]: For program point L102(line 102) no Hoare annotation was computed. [2020-07-21 19:53:32,485 INFO L268 CegarLoopResult]: For program point L86-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,485 INFO L271 CegarLoopResult]: At program point L111-1(lines 30 116) the Hoare annotation is: true [2020-07-21 19:53:32,485 INFO L268 CegarLoopResult]: For program point L87(line 87) no Hoare annotation was computed. [2020-07-21 19:53:32,485 INFO L268 CegarLoopResult]: For program point L112(line 112) no Hoare annotation was computed. [2020-07-21 19:53:32,485 INFO L264 CegarLoopResult]: At program point L112-1(lines 5 121) the Hoare annotation is: false [2020-07-21 19:53:32,485 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 121) no Hoare annotation was computed. [2020-07-21 19:53:32,486 INFO L268 CegarLoopResult]: For program point L71-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,486 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 119) no Hoare annotation was computed. [2020-07-21 19:53:32,486 INFO L268 CegarLoopResult]: For program point L96-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,486 INFO L268 CegarLoopResult]: For program point L63-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,486 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 121) the Hoare annotation is: true [2020-07-21 19:53:32,486 INFO L268 CegarLoopResult]: For program point L55-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L97(line 97) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L81-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L106-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L32(lines 32 34) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L82(line 82) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L107(line 107) no Hoare annotation was computed. [2020-07-21 19:53:32,487 INFO L268 CegarLoopResult]: For program point L91-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L75-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L67-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L92(line 92) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L59-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L271 CegarLoopResult]: At program point L117(lines 5 121) the Hoare annotation is: true [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L51(lines 51 53) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L51-2(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,488 INFO L268 CegarLoopResult]: For program point L101-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 19:53:32,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:53:32 BoogieIcfgContainer [2020-07-21 19:53:32,506 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:53:32,509 INFO L168 Benchmark]: Toolchain (without parser) took 8583.07 ms. Allocated memory was 144.2 MB in the beginning and 248.5 MB in the end (delta: 104.3 MB). Free memory was 102.6 MB in the beginning and 163.3 MB in the end (delta: -60.7 MB). Peak memory consumption was 43.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,510 INFO L168 Benchmark]: CDTParser took 0.57 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,511 INFO L168 Benchmark]: CACSL2BoogieTranslator took 325.28 ms. Allocated memory is still 144.2 MB. Free memory was 102.4 MB in the beginning and 92.0 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,511 INFO L168 Benchmark]: Boogie Preprocessor took 174.30 ms. Allocated memory was 144.2 MB in the beginning and 201.3 MB in the end (delta: 57.1 MB). Free memory was 92.0 MB in the beginning and 180.4 MB in the end (delta: -88.4 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,512 INFO L168 Benchmark]: RCFGBuilder took 449.47 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 163.1 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,512 INFO L168 Benchmark]: TraceAbstraction took 7625.27 ms. Allocated memory was 201.3 MB in the beginning and 248.5 MB in the end (delta: 47.2 MB). Free memory was 163.1 MB in the beginning and 163.3 MB in the end (delta: -119.9 kB). Peak memory consumption was 47.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:53:32,515 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.57 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 325.28 ms. Allocated memory is still 144.2 MB. Free memory was 102.4 MB in the beginning and 92.0 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 174.30 ms. Allocated memory was 144.2 MB in the beginning and 201.3 MB in the end (delta: 57.1 MB). Free memory was 92.0 MB in the beginning and 180.4 MB in the end (delta: -88.4 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 449.47 ms. Allocated memory is still 201.3 MB. Free memory was 180.4 MB in the beginning and 163.1 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7625.27 ms. Allocated memory was 201.3 MB in the beginning and 248.5 MB in the end (delta: 47.2 MB). Free memory was 163.1 MB in the beginning and 163.3 MB in the end (delta: -119.9 kB). Peak memory consumption was 47.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 119]: 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: 30]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 7.4s, OverallIterations: 19, TraceHistogramMax: 1, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1178 SDtfs, 544 SDslu, 791 SDs, 0 SdLazy, 102 SolverSat, 19 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 361 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2024occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.5s AutomataMinimizationTime, 19 MinimizatonAttempts, 528 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 138 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 380 NumberOfCodeBlocks, 318 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 361 ConstructedInterpolants, 0 QuantifiedInterpolants, 12910 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1478 ConjunctsInSsa, 57 ConjunctsInUnsatCore, 19 InterpolantComputations, 19 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...