/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-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:45:33,490 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:45:33,493 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:45:33,505 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:45:33,505 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:45:33,506 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:45:33,508 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:45:33,509 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:45:33,511 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:45:33,512 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:45:33,513 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:45:33,514 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:45:33,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:45:33,515 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:45:33,516 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:45:33,517 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:45:33,518 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:45:33,519 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:45:33,521 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:45:33,523 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:45:33,525 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:45:33,526 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:45:33,527 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:45:33,528 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:45:33,531 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:45:33,539 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:45:33,540 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:45:33,540 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:45:33,541 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 [2020-07-20 11:45:33,556 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:45:33,556 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:45:33,557 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:45:33,557 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:45:33,557 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:45:33,558 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:45:33,558 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:45:33,558 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:45:33,558 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:45:33,558 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:45:33,559 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:45:33,559 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:45:33,559 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:45:33,559 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:45:33,559 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:45:33,560 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:45:33,560 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:45:33,560 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:45:33,560 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:45:33,560 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:45:33,561 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:45:33,561 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:45:33,561 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:45:33,561 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:45:33,561 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:45:33,562 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:45:33,562 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:33,562 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:45:33,562 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:45:33,562 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 [2020-07-20 11:45:33,823 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:45:33,836 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:45:33,839 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:45:33,841 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:45:33,841 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:45:33,842 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 11:45:33,915 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f7e4b8a6/a3e0a62f9b114fbbb45cf2a4bb8c05e4/FLAG55ab56571 [2020-07-20 11:45:34,369 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:45:34,370 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-20 11:45:34,377 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f7e4b8a6/a3e0a62f9b114fbbb45cf2a4bb8c05e4/FLAG55ab56571 [2020-07-20 11:45:34,758 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f7e4b8a6/a3e0a62f9b114fbbb45cf2a4bb8c05e4 [2020-07-20 11:45:34,766 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:45:34,768 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:45:34,769 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:34,770 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:45:34,774 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:45:34,775 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:34" (1/1) ... [2020-07-20 11:45:34,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f41f43f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:34, skipping insertion in model container [2020-07-20 11:45:34,778 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:34" (1/1) ... [2020-07-20 11:45:34,785 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:45:34,805 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:45:34,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:34,989 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:45:35,006 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:35,021 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:45:35,021 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35 WrapperNode [2020-07-20 11:45:35,021 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:35,022 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:45:35,022 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:45:35,022 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:45:35,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,124 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,124 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,132 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,140 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,144 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... [2020-07-20 11:45:35,147 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:45:35,152 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:45:35,152 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:45:35,152 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:45:35,153 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:45:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:45:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:45:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:45:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-20 11:45:35,219 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:45:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:45:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:45:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:45:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-20 11:45:35,220 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-20 11:45:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:45:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 11:45:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:45:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:45:35,221 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 11:45:35,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:45:35,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:45:35,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:45:35,553 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:45:35,554 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 11:45:35,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:35 BoogieIcfgContainer [2020-07-20 11:45:35,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:45:35,561 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:45:35,561 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:45:35,564 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:45:35,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:45:34" (1/3) ... [2020-07-20 11:45:35,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67a29f7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:35, skipping insertion in model container [2020-07-20 11:45:35,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:35" (2/3) ... [2020-07-20 11:45:35,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67a29f7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:35, skipping insertion in model container [2020-07-20 11:45:35,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:35" (3/3) ... [2020-07-20 11:45:35,567 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-20 11:45:35,575 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:45:35,582 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:45:35,596 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:45:35,619 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:45:35,619 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:45:35,619 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:45:35,619 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:45:35,620 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:45:35,620 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:45:35,620 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:45:35,620 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:45:35,636 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:45:35,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:45:35,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:35,644 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] [2020-07-20 11:45:35,644 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:35,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:35,651 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-20 11:45:35,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:35,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281186750] [2020-07-20 11:45:35,661 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 [2020-07-20 11:45:35,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:35,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:45:35,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:35,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:35,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:35,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281186750] [2020-07-20 11:45:35,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:35,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:45:35,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552454400] [2020-07-20 11:45:35,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:45:35,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:35,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:45:35,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:35,813 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-20 11:45:35,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:35,837 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-07-20 11:45:35,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:45:35,839 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2020-07-20 11:45:35,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:35,849 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:45:35,849 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:45:35,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:35,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:45:35,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 11:45:35,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:45:35,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-20 11:45:35,898 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-07-20 11:45:35,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:35,899 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-20 11:45:35,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:45:35,899 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-20 11:45:35,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 11:45:35,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:35,900 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] [2020-07-20 11:45:36,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:36,102 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:36,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:36,103 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-07-20 11:45:36,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:36,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532861318] [2020-07-20 11:45:36,105 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 [2020-07-20 11:45:36,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:36,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:45:36,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:36,233 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:36,233 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:36,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532861318] [2020-07-20 11:45:36,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:36,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:45:36,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512516922] [2020-07-20 11:45:36,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:45:36,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:36,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:45:36,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:36,238 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 3 states. [2020-07-20 11:45:36,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:36,279 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2020-07-20 11:45:36,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:45:36,280 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-20 11:45:36,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:36,283 INFO L225 Difference]: With dead ends: 48 [2020-07-20 11:45:36,284 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:45:36,285 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 [2020-07-20 11:45:36,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:45:36,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2020-07-20 11:45:36,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:45:36,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-20 11:45:36,298 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-20 11:45:36,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:36,298 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-20 11:45:36,299 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:45:36,299 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-20 11:45:36,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:45:36,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:36,300 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] [2020-07-20 11:45:36,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:36,515 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:36,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:36,516 INFO L82 PathProgramCache]: Analyzing trace with hash 387293505, now seen corresponding path program 1 times [2020-07-20 11:45:36,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:36,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841931189] [2020-07-20 11:45:36,518 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 [2020-07-20 11:45:36,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:36,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:45:36,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:36,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:36,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:36,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841931189] [2020-07-20 11:45:36,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:36,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:45:36,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289353338] [2020-07-20 11:45:36,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:45:36,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:36,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:45:36,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:36,581 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 3 states. [2020-07-20 11:45:36,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:36,610 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2020-07-20 11:45:36,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:45:36,611 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-20 11:45:36,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:36,612 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:45:36,612 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 11:45:36,615 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 [2020-07-20 11:45:36,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 11:45:36,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 11:45:36,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:45:36,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 11:45:36,626 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 23 [2020-07-20 11:45:36,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:36,626 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 11:45:36,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:45:36,627 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 11:45:36,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 11:45:36,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:36,629 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] [2020-07-20 11:45:36,844 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:36,845 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:36,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:36,846 INFO L82 PathProgramCache]: Analyzing trace with hash -5733505, now seen corresponding path program 1 times [2020-07-20 11:45:36,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:36,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116486005] [2020-07-20 11:45:36,848 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 [2020-07-20 11:45:36,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:36,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:45:36,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:36,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:36,928 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:36,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116486005] [2020-07-20 11:45:36,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:36,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:45:36,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308087653] [2020-07-20 11:45:36,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:45:36,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:36,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:45:36,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:45:36,933 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 4 states. [2020-07-20 11:45:36,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:36,972 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-07-20 11:45:36,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:45:36,973 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-07-20 11:45:36,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:36,974 INFO L225 Difference]: With dead ends: 50 [2020-07-20 11:45:36,974 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:45:36,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:45:36,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:45:36,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-07-20 11:45:36,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:45:36,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-20 11:45:36,982 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 23 [2020-07-20 11:45:36,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:36,982 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-20 11:45:36,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:45:36,982 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-20 11:45:36,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:45:36,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:36,984 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:37,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:37,199 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:37,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:37,200 INFO L82 PathProgramCache]: Analyzing trace with hash 20292413, now seen corresponding path program 1 times [2020-07-20 11:45:37,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:37,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875712347] [2020-07-20 11:45:37,202 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 [2020-07-20 11:45:37,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:37,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:45:37,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:37,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:37,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:37,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:37,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875712347] [2020-07-20 11:45:37,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:37,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 11:45:37,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16569008] [2020-07-20 11:45:37,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:45:37,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:37,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:45:37,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:45:37,429 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-20 11:45:37,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:37,501 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-20 11:45:37,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:45:37,502 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-20 11:45:37,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:37,503 INFO L225 Difference]: With dead ends: 57 [2020-07-20 11:45:37,503 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:45:37,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:45:37,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:45:37,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:45:37,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:45:37,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-20 11:45:37,510 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 25 [2020-07-20 11:45:37,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:37,511 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-20 11:45:37,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:45:37,511 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-20 11:45:37,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:45:37,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:37,512 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:37,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:37,726 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:37,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:37,727 INFO L82 PathProgramCache]: Analyzing trace with hash 237942135, now seen corresponding path program 2 times [2020-07-20 11:45:37,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:37,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581580551] [2020-07-20 11:45:37,729 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 [2020-07-20 11:45:37,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:37,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:45:37,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:37,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:38,065 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:38,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581580551] [2020-07-20 11:45:38,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:38,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-20 11:45:38,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677371702] [2020-07-20 11:45:38,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:45:38,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:38,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:45:38,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:45:38,072 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 14 states. [2020-07-20 11:45:38,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:38,172 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2020-07-20 11:45:38,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:45:38,172 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-20 11:45:38,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:38,173 INFO L225 Difference]: With dead ends: 69 [2020-07-20 11:45:38,174 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:45:38,174 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:45:38,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:45:38,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 11:45:38,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 11:45:38,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-20 11:45:38,182 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 31 [2020-07-20 11:45:38,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:38,182 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-20 11:45:38,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:45:38,183 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-20 11:45:38,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 11:45:38,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:38,184 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:38,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:38,399 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:38,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:38,399 INFO L82 PathProgramCache]: Analyzing trace with hash -2007416981, now seen corresponding path program 3 times [2020-07-20 11:45:38,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:38,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522328841] [2020-07-20 11:45:38,400 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 [2020-07-20 11:45:38,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:38,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:45:38,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:38,649 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:38,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:39,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522328841] [2020-07-20 11:45:39,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:39,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-20 11:45:39,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503737386] [2020-07-20 11:45:39,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 11:45:39,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:39,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 11:45:39,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:45:39,088 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 26 states. [2020-07-20 11:45:39,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:39,308 INFO L93 Difference]: Finished difference Result 93 states and 110 transitions. [2020-07-20 11:45:39,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 11:45:39,309 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 43 [2020-07-20 11:45:39,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:39,311 INFO L225 Difference]: With dead ends: 93 [2020-07-20 11:45:39,311 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 11:45:39,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:45:39,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 11:45:39,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-20 11:45:39,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 11:45:39,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-20 11:45:39,332 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 43 [2020-07-20 11:45:39,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:39,333 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-20 11:45:39,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 11:45:39,333 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-20 11:45:39,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 11:45:39,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:39,342 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:39,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:39,543 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:39,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:39,544 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 4 times [2020-07-20 11:45:39,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:39,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714831543] [2020-07-20 11:45:39,545 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 [2020-07-20 11:45:39,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:39,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:45:39,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:40,141 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:40,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:41,652 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:41,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714831543] [2020-07-20 11:45:41,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:41,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-20 11:45:41,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895716877] [2020-07-20 11:45:41,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 11:45:41,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:41,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 11:45:41,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 11:45:41,655 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-20 11:45:42,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:42,067 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-20 11:45:42,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-20 11:45:42,068 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-20 11:45:42,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:42,070 INFO L225 Difference]: With dead ends: 141 [2020-07-20 11:45:42,071 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 11:45:42,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-20 11:45:42,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 11:45:42,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-20 11:45:42,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-20 11:45:42,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-20 11:45:42,086 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-20 11:45:42,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:42,087 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-20 11:45:42,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-20 11:45:42,087 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-20 11:45:42,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-20 11:45:42,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:42,089 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:42,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:42,300 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:42,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:42,301 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 5 times [2020-07-20 11:45:42,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:42,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360519626] [2020-07-20 11:45:42,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:45:42,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:42,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-20 11:45:42,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:44,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:44,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:44,373 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 11:45:44,581 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-20 11:45:49,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:49,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360519626] [2020-07-20 11:45:49,760 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:49,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 98 [2020-07-20 11:45:49,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846076898] [2020-07-20 11:45:49,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-20 11:45:49,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:49,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-20 11:45:49,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4659, Invalid=4847, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 11:45:49,767 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 98 states. [2020-07-20 11:45:50,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:50,661 INFO L93 Difference]: Finished difference Result 237 states and 290 transitions. [2020-07-20 11:45:50,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-20 11:45:50,667 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 115 [2020-07-20 11:45:50,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:50,669 INFO L225 Difference]: With dead ends: 237 [2020-07-20 11:45:50,670 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 11:45:50,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4711, Invalid=4991, Unknown=0, NotChecked=0, Total=9702 [2020-07-20 11:45:50,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 11:45:50,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-20 11:45:50,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 11:45:50,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2020-07-20 11:45:50,692 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 115 [2020-07-20 11:45:50,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:50,692 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2020-07-20 11:45:50,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-20 11:45:50,693 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2020-07-20 11:45:50,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-07-20 11:45:50,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:50,696 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:50,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:50,911 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:50,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:50,912 INFO L82 PathProgramCache]: Analyzing trace with hash -946549565, now seen corresponding path program 6 times [2020-07-20 11:45:50,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:50,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687317069] [2020-07-20 11:45:50,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:45:51,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:51,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-20 11:45:51,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:57,586 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:57,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:58,189 WARN L193 SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 11:45:58,762 WARN L193 SmtUtils]: Spent 564.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-20 11:46:20,737 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:20,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687317069] [2020-07-20 11:46:20,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:46:20,739 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 194 [2020-07-20 11:46:20,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568219340] [2020-07-20 11:46:20,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2020-07-20 11:46:20,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:46:20,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2020-07-20 11:46:20,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18531, Invalid=18911, Unknown=0, NotChecked=0, Total=37442 [2020-07-20 11:46:20,767 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand 194 states. [2020-07-20 11:46:26,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:46:26,071 INFO L93 Difference]: Finished difference Result 429 states and 530 transitions. [2020-07-20 11:46:26,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2020-07-20 11:46:26,072 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 211 [2020-07-20 11:46:26,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:46:26,075 INFO L225 Difference]: With dead ends: 429 [2020-07-20 11:46:26,075 INFO L226 Difference]: Without dead ends: 408 [2020-07-20 11:46:26,078 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=18631, Invalid=19199, Unknown=0, NotChecked=0, Total=37830 [2020-07-20 11:46:26,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-20 11:46:26,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2020-07-20 11:46:26,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-20 11:46:26,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 411 transitions. [2020-07-20 11:46:26,106 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 411 transitions. Word has length 211 [2020-07-20 11:46:26,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:46:26,107 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 411 transitions. [2020-07-20 11:46:26,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 194 states. [2020-07-20 11:46:26,107 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 411 transitions. [2020-07-20 11:46:26,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-20 11:46:26,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:46:26,115 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:46:26,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:46:26,330 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:46:26,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:46:26,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1988117501, now seen corresponding path program 7 times [2020-07-20 11:46:26,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:46:26,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738280676] [2020-07-20 11:46:26,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:46:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:46:26,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 2567 conjuncts, 194 conjunts are in the unsatisfiable core [2020-07-20 11:46:26,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:46:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:46:56,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:46:58,741 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-20 11:47:00,916 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-20 11:49:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:49:34,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738280676] [2020-07-20 11:49:34,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:49:34,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [194, 194] total 386 [2020-07-20 11:49:34,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888809453] [2020-07-20 11:49:34,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 386 states [2020-07-20 11:49:34,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:34,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 386 interpolants. [2020-07-20 11:49:34,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73923, Invalid=74687, Unknown=0, NotChecked=0, Total=148610 [2020-07-20 11:49:34,719 INFO L87 Difference]: Start difference. First operand 408 states and 411 transitions. Second operand 386 states. [2020-07-20 11:50:24,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:50:24,731 INFO L93 Difference]: Finished difference Result 813 states and 1010 transitions. [2020-07-20 11:50:24,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 386 states. [2020-07-20 11:50:24,734 INFO L78 Accepts]: Start accepts. Automaton has 386 states. Word has length 403 [2020-07-20 11:50:24,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:50:24,739 INFO L225 Difference]: With dead ends: 813 [2020-07-20 11:50:24,739 INFO L226 Difference]: Without dead ends: 792 [2020-07-20 11:50:24,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 420 SyntacticMatches, 1 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 182.9s TimeCoverageRelationStatistics Valid=74119, Invalid=75263, Unknown=0, NotChecked=0, Total=149382 [2020-07-20 11:50:24,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2020-07-20 11:50:24,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 792. [2020-07-20 11:50:24,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-20 11:50:24,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 795 transitions. [2020-07-20 11:50:24,773 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 795 transitions. Word has length 403 [2020-07-20 11:50:24,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:50:24,774 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 795 transitions. [2020-07-20 11:50:24,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 386 states. [2020-07-20 11:50:24,775 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 795 transitions. [2020-07-20 11:50:24,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 788 [2020-07-20 11:50:24,799 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:50:24,800 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:50:25,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:50:25,016 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:50:25,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:50:25,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1788110205, now seen corresponding path program 8 times [2020-07-20 11:50:25,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:50:25,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173032626] [2020-07-20 11:50:25,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-07-20 11:50:25,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:50:25,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 5063 conjuncts, 386 conjunts are in the unsatisfiable core [2020-07-20 11:50:25,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:55:03,613 INFO L134 CoverageAnalysis]: Checked inductivity of 145925 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:55:03,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:55:12,826 WARN L193 SmtUtils]: Spent 9.16 s on a formula simplification that was a NOOP. DAG size: 1156 [2020-07-20 11:55:22,043 WARN L193 SmtUtils]: Spent 9.18 s on a formula simplification that was a NOOP. DAG size: 1156