/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:37:08,575 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:37:08,578 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:37:08,590 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:37:08,590 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:37:08,592 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:37:08,593 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:37:08,595 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:37:08,597 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:37:08,598 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:37:08,599 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:37:08,600 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:37:08,600 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:37:08,601 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:37:08,602 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:37:08,603 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:37:08,604 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:37:08,605 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:37:08,607 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:37:08,609 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:37:08,611 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:37:08,612 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:37:08,613 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:37:08,614 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:37:08,617 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:37:08,625 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:37:08,626 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:37:08,627 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:37:08,627 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 11:37:08,642 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:37:08,643 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:37:08,644 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:37:08,644 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:37:08,644 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:37:08,645 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:37:08,645 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:37:08,645 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:37:08,645 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:37:08,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:37:08,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:37:08,646 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:37:08,646 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:37:08,646 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:37:08,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:37:08,647 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:37:08,647 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:37:08,647 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:37:08,647 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:37:08,648 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:37:08,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:37:08,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:37:08,648 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:37:08,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:37:08,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:37:08,649 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:37:08,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:08,649 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:37:08,650 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:37:08,650 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 -> NOT_INCREMENTALLY [2020-07-21 11:37:08,952 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:37:08,971 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:37:08,975 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:37:08,976 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:37:08,979 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:37:08,980 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i [2020-07-21 11:37:09,058 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffa1d0e91/17dca90e10bd42be98fd51ad379c3048/FLAG08ec03a34 [2020-07-21 11:37:09,565 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:37:09,565 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/data_structures_set_multi_proc_trivial_ground.i [2020-07-21 11:37:09,572 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffa1d0e91/17dca90e10bd42be98fd51ad379c3048/FLAG08ec03a34 [2020-07-21 11:37:09,930 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffa1d0e91/17dca90e10bd42be98fd51ad379c3048 [2020-07-21 11:37:09,940 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:37:09,943 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:37:09,944 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:37:09,945 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:37:09,948 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:37:09,949 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:37:09" (1/1) ... [2020-07-21 11:37:09,952 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@271a68a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:09, skipping insertion in model container [2020-07-21 11:37:09,952 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:37:09" (1/1) ... [2020-07-21 11:37:09,960 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:37:09,980 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:37:10,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:37:10,223 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:37:10,249 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:37:10,263 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:37:10,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10 WrapperNode [2020-07-21 11:37:10,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:37:10,264 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:37:10,264 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:37:10,265 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:37:10,367 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,367 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,376 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,376 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,386 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,394 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,396 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (1/1) ... [2020-07-21 11:37:10,400 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:37:10,400 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:37:10,400 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:37:10,401 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:37:10,401 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (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 11:37:10,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:37:10,468 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:37:10,468 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:37:10,468 INFO L138 BoogieDeclarations]: Found implementation of procedure insert [2020-07-21 11:37:10,468 INFO L138 BoogieDeclarations]: Found implementation of procedure elem_exists [2020-07-21 11:37:10,468 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure insert [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 11:37:10,469 INFO L130 BoogieDeclarations]: Found specification of procedure elem_exists [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:37:10,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:37:10,835 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:37:10,835 INFO L295 CfgBuilder]: Removed 10 assume(true) statements. [2020-07-21 11:37:10,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:37:10 BoogieIcfgContainer [2020-07-21 11:37:10,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:37:10,841 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:37:10,841 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:37:10,844 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:37:10,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:37:09" (1/3) ... [2020-07-21 11:37:10,845 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@761e6aa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:37:10, skipping insertion in model container [2020-07-21 11:37:10,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:10" (2/3) ... [2020-07-21 11:37:10,846 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@761e6aa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:37:10, skipping insertion in model container [2020-07-21 11:37:10,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:37:10" (3/3) ... [2020-07-21 11:37:10,847 INFO L109 eAbstractionObserver]: Analyzing ICFG data_structures_set_multi_proc_trivial_ground.i [2020-07-21 11:37:10,856 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:37:10,862 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:37:10,874 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:37:10,894 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:37:10,895 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:37:10,895 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:37:10,895 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:37:10,895 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:37:10,895 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:37:10,895 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:37:10,895 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:37:10,914 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states. [2020-07-21 11:37:10,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 11:37:10,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:10,922 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:10,922 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:10,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:10,928 INFO L82 PathProgramCache]: Analyzing trace with hash 528217166, now seen corresponding path program 1 times [2020-07-21 11:37:10,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:10,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110176782] [2020-07-21 11:37:10,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:11,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:11,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 11:37:11,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:11,086 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 11:37:11,087 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:37:11,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110176782] [2020-07-21 11:37:11,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:37:11,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:37:11,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61136378] [2020-07-21 11:37:11,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:37:11,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:11,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:37:11,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:37:11,110 INFO L87 Difference]: Start difference. First operand 61 states. Second operand 3 states. [2020-07-21 11:37:11,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:11,246 INFO L93 Difference]: Finished difference Result 150 states and 228 transitions. [2020-07-21 11:37:11,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:37:11,248 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-21 11:37:11,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:11,262 INFO L225 Difference]: With dead ends: 150 [2020-07-21 11:37:11,262 INFO L226 Difference]: Without dead ends: 89 [2020-07-21 11:37:11,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 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 11:37:11,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-21 11:37:11,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 57. [2020-07-21 11:37:11,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 11:37:11,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 70 transitions. [2020-07-21 11:37:11,325 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 70 transitions. Word has length 14 [2020-07-21 11:37:11,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:11,326 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 70 transitions. [2020-07-21 11:37:11,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:37:11,326 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 70 transitions. [2020-07-21 11:37:11,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 11:37:11,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:11,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:11,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:11,542 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:11,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:11,543 INFO L82 PathProgramCache]: Analyzing trace with hash 396779504, now seen corresponding path program 1 times [2020-07-21 11:37:11,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:11,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903705079] [2020-07-21 11:37:11,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:11,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:11,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:37:11,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:11,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:11,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:11,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:11,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903705079] [2020-07-21 11:37:11,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:11,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 11:37:11,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782762028] [2020-07-21 11:37:11,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:37:11,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:11,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:37:11,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:37:11,659 INFO L87 Difference]: Start difference. First operand 57 states and 70 transitions. Second operand 6 states. [2020-07-21 11:37:11,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:11,955 INFO L93 Difference]: Finished difference Result 235 states and 315 transitions. [2020-07-21 11:37:11,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:37:11,956 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 11:37:11,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:11,960 INFO L225 Difference]: With dead ends: 235 [2020-07-21 11:37:11,960 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 11:37:11,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:37:11,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 11:37:11,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 63. [2020-07-21 11:37:11,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 11:37:11,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2020-07-21 11:37:11,979 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 16 [2020-07-21 11:37:11,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:11,979 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2020-07-21 11:37:11,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:37:11,980 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2020-07-21 11:37:11,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 11:37:11,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:11,981 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:12,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:12,195 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:12,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:12,196 INFO L82 PathProgramCache]: Analyzing trace with hash -739516458, now seen corresponding path program 2 times [2020-07-21 11:37:12,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:12,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409393452] [2020-07-21 11:37:12,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:12,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:12,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:37:12,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:12,290 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:12,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:12,373 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:12,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409393452] [2020-07-21 11:37:12,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:12,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 11:37:12,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679601540] [2020-07-21 11:37:12,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 11:37:12,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:12,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 11:37:12,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:37:12,376 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand 12 states. [2020-07-21 11:37:12,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:12,876 INFO L93 Difference]: Finished difference Result 433 states and 594 transitions. [2020-07-21 11:37:12,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:37:12,877 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-21 11:37:12,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:12,882 INFO L225 Difference]: With dead ends: 433 [2020-07-21 11:37:12,882 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 11:37:12,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:37:12,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 11:37:12,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 75. [2020-07-21 11:37:12,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 11:37:12,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 88 transitions. [2020-07-21 11:37:12,908 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 88 transitions. Word has length 22 [2020-07-21 11:37:12,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:12,909 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 88 transitions. [2020-07-21 11:37:12,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 11:37:12,909 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 88 transitions. [2020-07-21 11:37:12,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 11:37:12,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:12,911 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:13,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:13,126 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:13,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:13,127 INFO L82 PathProgramCache]: Analyzing trace with hash 224801314, now seen corresponding path program 3 times [2020-07-21 11:37:13,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:13,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044476998] [2020-07-21 11:37:13,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:13,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:13,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:37:13,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:13,326 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:13,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:13,583 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:13,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044476998] [2020-07-21 11:37:13,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:13,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 11:37:13,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671825488] [2020-07-21 11:37:13,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:37:13,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:13,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:37:13,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:37:13,587 INFO L87 Difference]: Start difference. First operand 75 states and 88 transitions. Second operand 24 states. [2020-07-21 11:37:14,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:14,648 INFO L93 Difference]: Finished difference Result 829 states and 1152 transitions. [2020-07-21 11:37:14,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 11:37:14,649 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-21 11:37:14,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:14,660 INFO L225 Difference]: With dead ends: 829 [2020-07-21 11:37:14,660 INFO L226 Difference]: Without dead ends: 781 [2020-07-21 11:37:14,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:37:14,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2020-07-21 11:37:14,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 99. [2020-07-21 11:37:14,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 11:37:14,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 112 transitions. [2020-07-21 11:37:14,726 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 112 transitions. Word has length 34 [2020-07-21 11:37:14,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:14,727 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 112 transitions. [2020-07-21 11:37:14,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:37:14,727 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 112 transitions. [2020-07-21 11:37:14,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 11:37:14,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:14,732 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:14,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:14,946 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:14,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:14,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1230414010, now seen corresponding path program 4 times [2020-07-21 11:37:14,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:14,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1277907025] [2020-07-21 11:37:14,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:15,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:15,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 11:37:15,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:15,380 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:15,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:16,311 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:16,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1277907025] [2020-07-21 11:37:16,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:16,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 11:37:16,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561962345] [2020-07-21 11:37:16,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 11:37:16,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:16,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 11:37:16,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:37:16,316 INFO L87 Difference]: Start difference. First operand 99 states and 112 transitions. Second operand 48 states. [2020-07-21 11:37:19,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:19,518 INFO L93 Difference]: Finished difference Result 1621 states and 2268 transitions. [2020-07-21 11:37:19,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 11:37:19,519 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-21 11:37:19,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:19,535 INFO L225 Difference]: With dead ends: 1621 [2020-07-21 11:37:19,535 INFO L226 Difference]: Without dead ends: 1573 [2020-07-21 11:37:19,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:37:19,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1573 states. [2020-07-21 11:37:19,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1573 to 147. [2020-07-21 11:37:19,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 11:37:19,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 160 transitions. [2020-07-21 11:37:19,610 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 160 transitions. Word has length 58 [2020-07-21 11:37:19,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:19,612 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 160 transitions. [2020-07-21 11:37:19,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 11:37:19,615 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 160 transitions. [2020-07-21 11:37:19,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 11:37:19,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:19,626 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:19,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:19,831 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:19,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:19,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1759159786, now seen corresponding path program 5 times [2020-07-21 11:37:19,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:19,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125916242] [2020-07-21 11:37:19,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:19,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:19,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 11:37:19,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:21,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:21,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:24,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:24,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125916242] [2020-07-21 11:37:24,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:24,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 11:37:24,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642230199] [2020-07-21 11:37:24,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 11:37:24,761 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:24,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 11:37:24,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 11:37:24,766 INFO L87 Difference]: Start difference. First operand 147 states and 160 transitions. Second operand 96 states. [2020-07-21 11:37:39,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:39,242 INFO L93 Difference]: Finished difference Result 3205 states and 4500 transitions. [2020-07-21 11:37:39,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 11:37:39,243 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-21 11:37:39,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:39,261 INFO L225 Difference]: With dead ends: 3205 [2020-07-21 11:37:39,261 INFO L226 Difference]: Without dead ends: 3157 [2020-07-21 11:37:39,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 11:37:39,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3157 states. [2020-07-21 11:37:39,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3157 to 243. [2020-07-21 11:37:39,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 243 states. [2020-07-21 11:37:39,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 256 transitions. [2020-07-21 11:37:39,343 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 256 transitions. Word has length 106 [2020-07-21 11:37:39,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:39,344 INFO L479 AbstractCegarLoop]: Abstraction has 243 states and 256 transitions. [2020-07-21 11:37:39,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 11:37:39,344 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 256 transitions. [2020-07-21 11:37:39,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 11:37:39,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:39,346 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:39,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:39,561 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:39,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:39,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1003594, now seen corresponding path program 6 times [2020-07-21 11:37:39,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:39,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876010755] [2020-07-21 11:37:39,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:39,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:39,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 11:37:39,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:44,565 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:44,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:59,379 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:59,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876010755] [2020-07-21 11:37:59,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:59,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-21 11:37:59,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532381328] [2020-07-21 11:37:59,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-21 11:37:59,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:59,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-21 11:37:59,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 11:37:59,393 INFO L87 Difference]: Start difference. First operand 243 states and 256 transitions. Second operand 192 states. [2020-07-21 11:40:30,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:30,676 INFO L93 Difference]: Finished difference Result 6373 states and 8964 transitions. [2020-07-21 11:40:30,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-21 11:40:30,676 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 202 [2020-07-21 11:40:30,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:30,718 INFO L225 Difference]: With dead ends: 6373 [2020-07-21 11:40:30,718 INFO L226 Difference]: Without dead ends: 6325 [2020-07-21 11:40:30,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 11:40:30,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6325 states. [2020-07-21 11:40:30,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6325 to 435. [2020-07-21 11:40:30,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 435 states. [2020-07-21 11:40:30,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 448 transitions. [2020-07-21 11:40:30,949 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 448 transitions. Word has length 202 [2020-07-21 11:40:30,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:30,951 INFO L479 AbstractCegarLoop]: Abstraction has 435 states and 448 transitions. [2020-07-21 11:40:30,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-21 11:40:30,951 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 448 transitions. [2020-07-21 11:40:30,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-21 11:40:30,962 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:30,964 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:31,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:31,166 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:31,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:31,166 INFO L82 PathProgramCache]: Analyzing trace with hash 472589578, now seen corresponding path program 7 times [2020-07-21 11:40:31,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:31,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629097410] [2020-07-21 11:40:31,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:40:31,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:31,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 1200 conjuncts, 192 conjunts are in the unsatisfiable core [2020-07-21 11:40:31,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:53,018 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:53,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:58,493 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:41:58,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [629097410] [2020-07-21 11:41:58,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:41:58,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384 [2020-07-21 11:41:58,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414523572] [2020-07-21 11:41:58,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 384 states [2020-07-21 11:41:58,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:58,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants. [2020-07-21 11:41:58,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-21 11:41:58,521 INFO L87 Difference]: Start difference. First operand 435 states and 448 transitions. Second operand 384 states.