/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/recursive-simple/id_i15_o15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:14:10,615 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:14:10,617 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:14:10,630 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:14:10,630 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:14:10,631 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:14:10,633 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:14:10,634 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:14:10,636 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:14:10,637 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:14:10,638 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:14:10,639 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:14:10,639 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:14:10,640 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:14:10,641 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:14:10,642 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:14:10,643 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:14:10,644 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:14:10,646 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:14:10,648 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:14:10,649 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:14:10,650 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:14:10,651 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:14:10,652 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:14:10,654 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:14:10,664 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:14:10,665 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:14:10,666 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:14:10,667 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 11:14:10,691 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:14:10,691 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:14:10,693 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:14:10,693 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:14:10,693 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:14:10,694 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:14:10,694 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:14:10,694 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:14:10,694 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:14:10,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:14:10,695 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:14:10,696 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:14:10,696 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:14:10,696 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:14:10,696 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:14:10,697 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:14:10,697 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:14:10,697 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:14:10,697 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:14:10,697 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:14:10,698 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:14:10,698 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:14:10,698 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:14:10,698 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:14:10,698 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:14:10,699 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:14:10,699 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:10,699 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:14:10,699 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:14:10,699 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 11:14:10,983 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:14:10,996 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:14:11,000 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:14:11,001 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:14:11,002 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:14:11,002 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-1.c [2020-07-20 11:14:11,079 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f4f7c840/2b08a16eeddc4a00ad24109393a9dc94/FLAGf92c0024d [2020-07-20 11:14:11,540 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:14:11,541 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i15_o15-1.c [2020-07-20 11:14:11,547 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f4f7c840/2b08a16eeddc4a00ad24109393a9dc94/FLAGf92c0024d [2020-07-20 11:14:11,910 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8f4f7c840/2b08a16eeddc4a00ad24109393a9dc94 [2020-07-20 11:14:11,922 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:14:11,925 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:14:11,926 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:14:11,927 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:14:11,931 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:14:11,932 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:14:11" (1/1) ... [2020-07-20 11:14:11,935 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@488ef66a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:11, skipping insertion in model container [2020-07-20 11:14:11,935 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:14:11" (1/1) ... [2020-07-20 11:14:11,943 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:14:11,963 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:14:12,176 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:14:12,180 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:14:12,196 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:14:12,213 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:14:12,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12 WrapperNode [2020-07-20 11:14:12,214 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:14:12,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:14:12,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:14:12,215 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:14:12,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,231 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,237 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,240 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,242 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,243 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (1/1) ... [2020-07-20 11:14:12,245 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:14:12,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:14:12,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:14:12,246 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:14:12,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (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 11:14:12,468 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:14:12,469 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:14:12,469 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 11:14:12,469 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:14:12,469 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:14:12,469 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:14:12,469 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 11:14:12,470 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:14:12,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:14:12,471 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:14:12,627 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:14:12,627 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:14:12,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:14:12 BoogieIcfgContainer [2020-07-20 11:14:12,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:14:12,633 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:14:12,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:14:12,636 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:14:12,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:14:11" (1/3) ... [2020-07-20 11:14:12,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d8268e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:14:12, skipping insertion in model container [2020-07-20 11:14:12,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:14:12" (2/3) ... [2020-07-20 11:14:12,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d8268e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:14:12, skipping insertion in model container [2020-07-20 11:14:12,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:14:12" (3/3) ... [2020-07-20 11:14:12,640 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-1.c [2020-07-20 11:14:12,650 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:14:12,658 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:14:12,671 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:14:12,693 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:14:12,693 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:14:12,693 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:14:12,694 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:14:12,694 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:14:12,694 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:14:12,694 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:14:12,694 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:14:12,712 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:14:12,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:14:12,718 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:12,719 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:12,720 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:12,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:12,726 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 11:14:12,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:12,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922496038] [2020-07-20 11:14:12,736 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 11:14:12,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:12,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 11:14:12,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:12,976 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 11:14:12,976 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:14:12,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922496038] [2020-07-20 11:14:12,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:14:12,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:14:12,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484406162] [2020-07-20 11:14:12,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:14:12,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:12,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:14:13,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:14:13,003 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:14:13,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:13,079 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 11:14:13,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:14:13,082 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:14:13,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:13,092 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:14:13,092 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:14:13,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:14:13,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:14:13,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:14:13,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:14:13,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:14:13,139 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:14:13,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:13,140 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:14:13,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:14:13,140 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:14:13,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:14:13,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:13,143 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:13,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:13,359 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:13,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:13,360 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 11:14:13,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:13,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650819938] [2020-07-20 11:14:13,362 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 11:14:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:13,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:14:13,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:13,449 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:14:13,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:13,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:13,618 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:13,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:14:13,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650819938] [2020-07-20 11:14:13,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:13,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 11:14:13,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811548023] [2020-07-20 11:14:13,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:14:13,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:13,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:14:13,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:14:13,664 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 11:14:13,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:13,731 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 11:14:13,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:14:13,732 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 11:14:13,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:13,733 INFO L225 Difference]: With dead ends: 25 [2020-07-20 11:14:13,734 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 11:14:13,735 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:14:13,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 11:14:13,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 11:14:13,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 11:14:13,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 11:14:13,743 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 11:14:13,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:13,743 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 11:14:13,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:14:13,744 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 11:14:13,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 11:14:13,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:13,745 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:13,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:13,961 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:13,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:13,962 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-20 11:14:13,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:13,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480542484] [2020-07-20 11:14:13,963 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 11:14:14,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:14,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:14:14,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:14,070 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 11:14:14,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:14,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:14,430 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 11:14:14,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480542484] [2020-07-20 11:14:14,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:14,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 11:14:14,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285521944] [2020-07-20 11:14:14,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 11:14:14,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:14,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 11:14:14,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 11:14:14,433 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 11:14:14,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:14,508 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 11:14:14,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:14:14,509 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 11:14:14,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:14,510 INFO L225 Difference]: With dead ends: 28 [2020-07-20 11:14:14,511 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:14:14,511 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:14:14,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:14:14,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:14:14,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:14:14,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:14:14,518 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 11:14:14,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:14,518 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:14:14,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 11:14:14,519 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:14:14,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:14:14,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:14,520 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:14,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:14,734 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:14,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:14,735 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-20 11:14:14,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:14,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306649285] [2020-07-20 11:14:14,736 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 11:14:14,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:14,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 11:14:14,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:14,821 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:14:14,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:15,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:15,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:15,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:15,324 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 11:14:15,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306649285] [2020-07-20 11:14:15,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:15,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 11:14:15,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969120261] [2020-07-20 11:14:15,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 11:14:15,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:15,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 11:14:15,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 11:14:15,326 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 11:14:15,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:15,408 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 11:14:15,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:14:15,410 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 11:14:15,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:15,411 INFO L225 Difference]: With dead ends: 31 [2020-07-20 11:14:15,411 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 11:14:15,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:14:15,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 11:14:15,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 11:14:15,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:14:15,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 11:14:15,418 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 11:14:15,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:15,419 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 11:14:15,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 11:14:15,419 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 11:14:15,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 11:14:15,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:15,420 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:15,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:15,624 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:15,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:15,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-20 11:14:15,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:15,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890388186] [2020-07-20 11:14:15,627 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 11:14:15,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:15,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:14:15,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:15,745 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 11:14:15,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:16,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:16,622 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 11:14:16,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890388186] [2020-07-20 11:14:16,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:16,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 11:14:16,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503716576] [2020-07-20 11:14:16,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 11:14:16,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:16,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 11:14:16,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 11:14:16,625 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-20 11:14:16,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:16,724 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 11:14:16,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:14:16,730 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 11:14:16,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:16,732 INFO L225 Difference]: With dead ends: 34 [2020-07-20 11:14:16,732 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 11:14:16,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:14:16,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 11:14:16,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 11:14:16,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 11:14:16,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 11:14:16,742 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 11:14:16,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:16,743 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 11:14:16,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 11:14:16,744 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 11:14:16,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 11:14:16,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:16,745 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:16,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:16,947 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:16,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:16,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-20 11:14:16,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:16,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694352354] [2020-07-20 11:14:16,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 11:14:16,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:16,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 11:14:16,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:17,061 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 11:14:17,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:17,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:18,369 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:14:18,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694352354] [2020-07-20 11:14:18,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:18,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 11:14:18,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401458601] [2020-07-20 11:14:18,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 11:14:18,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:18,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 11:14:18,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 11:14:18,372 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-20 11:14:18,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:18,487 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-20 11:14:18,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 11:14:18,488 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 11:14:18,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:18,489 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:14:18,489 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:14:18,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:14:18,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:14:18,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 11:14:18,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:14:18,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 11:14:18,503 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-20 11:14:18,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:18,504 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 11:14:18,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 11:14:18,505 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 11:14:18,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 11:14:18,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:18,509 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:18,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:18,726 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:18,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:18,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-20 11:14:18,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:18,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115139927] [2020-07-20 11:14:18,728 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 11:14:18,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:18,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 11:14:18,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:18,875 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 11:14:18,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:19,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:20,836 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 11:14:20,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115139927] [2020-07-20 11:14:20,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:20,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 11:14:20,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779377104] [2020-07-20 11:14:20,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 11:14:20,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:20,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 11:14:20,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 11:14:20,839 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-20 11:14:21,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:21,002 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-20 11:14:21,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:14:21,002 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-20 11:14:21,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:21,004 INFO L225 Difference]: With dead ends: 40 [2020-07-20 11:14:21,004 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:14:21,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 11:14:21,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:14:21,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:14:21,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:14:21,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 11:14:21,011 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-20 11:14:21,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:21,011 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 11:14:21,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 11:14:21,011 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 11:14:21,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 11:14:21,013 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:21,013 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:21,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:21,221 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:21,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:21,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-20 11:14:21,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:21,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620578028] [2020-07-20 11:14:21,224 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 11:14:21,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:21,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 11:14:21,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:14:21,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:22,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:22,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:23,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:24,172 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 11:14:24,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620578028] [2020-07-20 11:14:24,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:24,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 11:14:24,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337838971] [2020-07-20 11:14:24,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:14:24,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:24,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:14:24,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:14:24,174 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-20 11:14:24,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:24,364 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-20 11:14:24,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:14:24,365 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-20 11:14:24,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:24,366 INFO L225 Difference]: With dead ends: 43 [2020-07-20 11:14:24,367 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 11:14:24,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:14:24,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 11:14:24,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 11:14:24,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 11:14:24,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 11:14:24,373 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-20 11:14:24,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:24,374 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 11:14:24,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:14:24,374 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 11:14:24,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 11:14:24,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:24,375 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:24,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:24,581 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:24,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:24,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-20 11:14:24,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:24,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [234595740] [2020-07-20 11:14:24,584 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 11:14:24,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:24,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:14:24,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:24,825 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 11:14:24,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:26,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:27,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:27,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:28,826 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 11:14:28,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [234595740] [2020-07-20 11:14:28,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:28,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 11:14:28,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869031063] [2020-07-20 11:14:28,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 11:14:28,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:28,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 11:14:28,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 11:14:28,830 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-20 11:14:29,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:29,015 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-20 11:14:29,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:14:29,016 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-20 11:14:29,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:29,023 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:14:29,023 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 11:14:29,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 11:14:29,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 11:14:29,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 11:14:29,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 11:14:29,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-20 11:14:29,030 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-20 11:14:29,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:29,031 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-20 11:14:29,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 11:14:29,031 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-20 11:14:29,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 11:14:29,032 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:29,032 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:29,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:29,236 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:29,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:29,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-20 11:14:29,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:29,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713607202] [2020-07-20 11:14:29,237 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 11:14:29,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:29,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 11:14:29,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:29,486 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-20 11:14:29,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:32,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:32,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:33,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:33,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:33,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:33,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:34,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:35,009 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 11:14:35,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713607202] [2020-07-20 11:14:35,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:35,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 11:14:35,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086814977] [2020-07-20 11:14:35,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 11:14:35,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:35,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 11:14:35,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 11:14:35,012 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 25 states. [2020-07-20 11:14:35,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:35,247 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-20 11:14:35,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 11:14:35,248 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 67 [2020-07-20 11:14:35,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:35,249 INFO L225 Difference]: With dead ends: 49 [2020-07-20 11:14:35,249 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 11:14:35,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:14:35,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 11:14:35,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-20 11:14:35,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 11:14:35,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 11:14:35,261 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-20 11:14:35,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:35,261 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 11:14:35,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 11:14:35,261 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 11:14:35,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 11:14:35,263 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:35,263 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:35,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:35,470 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:35,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:35,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-20 11:14:35,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:35,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434275967] [2020-07-20 11:14:35,472 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 11:14:35,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:35,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:14:35,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:35,783 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-20 11:14:35,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:39,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:39,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:40,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:40,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:41,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:41,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:41,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:42,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:43,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:43,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:43,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:43,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:43,350 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-20 11:14:43,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434275967] [2020-07-20 11:14:43,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:43,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 11:14:43,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974634773] [2020-07-20 11:14:43,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 11:14:43,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:43,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 11:14:43,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 11:14:43,359 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 27 states. [2020-07-20 11:14:43,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:43,634 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-20 11:14:43,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:14:43,635 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 73 [2020-07-20 11:14:43,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:43,637 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:14:43,637 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 11:14:43,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 98 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:14:43,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 11:14:43,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 11:14:43,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 11:14:43,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-20 11:14:43,645 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-20 11:14:43,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:43,645 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-20 11:14:43,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 11:14:43,645 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-20 11:14:43,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-20 11:14:43,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:43,647 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:43,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:43,861 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:43,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:43,862 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-20 11:14:43,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:43,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869907117] [2020-07-20 11:14:43,862 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 11:14:44,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:44,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 11:14:44,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:44,393 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-20 11:14:44,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:14:48,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:48,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:50,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:51,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:51,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:52,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:52,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:53,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:14:54,869 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 11:14:54,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869907117] [2020-07-20 11:14:54,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:14:54,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 11:14:54,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117657165] [2020-07-20 11:14:54,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 11:14:54,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:14:54,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 11:14:54,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 11:14:54,872 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 29 states. [2020-07-20 11:14:55,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:14:55,238 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-07-20 11:14:55,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 11:14:55,239 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2020-07-20 11:14:55,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:14:55,240 INFO L225 Difference]: With dead ends: 55 [2020-07-20 11:14:55,241 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 11:14:55,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 106 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 11:14:55,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 11:14:55,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-20 11:14:55,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 11:14:55,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-20 11:14:55,258 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-07-20 11:14:55,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:14:55,259 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-20 11:14:55,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 11:14:55,259 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-20 11:14:55,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 11:14:55,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:14:55,261 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:14:55,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:55,477 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:14:55,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:14:55,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-07-20 11:14:55,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:14:55,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5675240] [2020-07-20 11:14:55,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:14:55,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:14:55,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 11:14:55,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:14:56,024 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 11:14:56,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:01,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:01,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:03,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:03,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:05,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:05,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:06,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:07,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:08,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:08,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:09,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:09,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:09,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:09,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:10,391 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 11:15:10,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5675240] [2020-07-20 11:15:10,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:10,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 11:15:10,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305291776] [2020-07-20 11:15:10,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 11:15:10,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:10,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 11:15:10,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 11:15:10,394 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 31 states. [2020-07-20 11:15:10,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:10,800 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-07-20 11:15:10,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 11:15:10,801 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 85 [2020-07-20 11:15:10,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:10,803 INFO L225 Difference]: With dead ends: 58 [2020-07-20 11:15:10,803 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 11:15:10,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 114 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 11:15:10,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 11:15:10,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-20 11:15:10,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 11:15:10,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-07-20 11:15:10,811 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-07-20 11:15:10,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:10,811 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-07-20 11:15:10,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 11:15:10,811 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-07-20 11:15:10,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-20 11:15:10,812 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:10,813 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:11,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:11,020 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:11,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:11,021 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-07-20 11:15:11,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:11,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809831519] [2020-07-20 11:15:11,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:11,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:11,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 11:15:11,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:11,699 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-20 11:15:11,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:18,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:21,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:21,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:23,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:23,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:25,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:27,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:28,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:28,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:29,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:29,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:29,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:29,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:30,939 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-07-20 11:15:30,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809831519] [2020-07-20 11:15:30,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:30,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-20 11:15:30,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524283184] [2020-07-20 11:15:30,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 11:15:30,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:30,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 11:15:30,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 11:15:30,941 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 33 states. [2020-07-20 11:15:31,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:31,393 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-07-20 11:15:31,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 11:15:31,395 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 91 [2020-07-20 11:15:31,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:31,396 INFO L225 Difference]: With dead ends: 61 [2020-07-20 11:15:31,396 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 11:15:31,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 122 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 11:15:31,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 11:15:31,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 11:15:31,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 11:15:31,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-20 11:15:31,403 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-07-20 11:15:31,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:31,404 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-20 11:15:31,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 11:15:31,404 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-20 11:15:31,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-20 11:15:31,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:31,405 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:31,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:31,614 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:31,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:31,615 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-07-20 11:15:31,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:31,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43079043] [2020-07-20 11:15:31,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:32,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:32,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 11:15:32,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-20 11:15:32,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:35,019 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 11:15:35,223 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 11:15:35,327 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 11:15:35,436 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 11:15:35,543 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 11:15:35,653 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 11:15:35,755 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2020-07-20 11:15:39,792 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 11:15:40,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:40,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:42,882 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 11:15:44,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:44,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:47,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:47,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:48,971 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 11:15:49,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:49,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:51,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:51,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:53,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:53,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:54,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:55,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:56,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:56,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:56,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:56,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:56,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:15:57,423 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-07-20 11:15:57,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43079043] [2020-07-20 11:15:57,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:57,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33] total 34 [2020-07-20 11:15:57,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585495224] [2020-07-20 11:15:57,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 11:15:57,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:57,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 11:15:57,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 11:15:57,427 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 34 states. [2020-07-20 11:15:58,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:58,012 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-07-20 11:15:58,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 11:15:58,014 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 97 [2020-07-20 11:15:58,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:58,015 INFO L225 Difference]: With dead ends: 64 [2020-07-20 11:15:58,015 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 11:15:58,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 130 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 11:15:58,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 11:15:58,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 11:15:58,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:15:58,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 11:15:58,022 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-07-20 11:15:58,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:58,023 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 11:15:58,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 11:15:58,023 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 11:15:58,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 11:15:58,024 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:58,024 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:58,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:58,239 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:58,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:58,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-07-20 11:15:58,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:58,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784894701] [2020-07-20 11:15:58,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:58,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:58,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:15:58,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:59,996 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:15:59,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:03,317 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:03,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784894701] [2020-07-20 11:16:03,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:03,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 35 [2020-07-20 11:16:03,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978856438] [2020-07-20 11:16:03,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 11:16:03,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:03,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 11:16:03,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:16:03,319 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2020-07-20 11:16:04,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:04,046 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-07-20 11:16:04,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 11:16:04,047 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2020-07-20 11:16:04,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:04,049 INFO L225 Difference]: With dead ends: 67 [2020-07-20 11:16:04,049 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 11:16:04,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 11:16:04,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 11:16:04,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-07-20 11:16:04,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-20 11:16:04,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-07-20 11:16:04,056 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-07-20 11:16:04,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:04,057 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-07-20 11:16:04,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 11:16:04,057 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-07-20 11:16:04,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 11:16:04,058 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:04,058 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:04,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:04,272 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:04,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:04,272 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-07-20 11:16:04,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:04,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289973333] [2020-07-20 11:16:04,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:04,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:04,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-20 11:16:04,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:05,366 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 392 proven. 0 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-07-20 11:16:05,366 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:16:05,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289973333] [2020-07-20 11:16:05,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:16:05,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2020-07-20 11:16:05,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814254757] [2020-07-20 11:16:05,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 11:16:05,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:05,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 11:16:05,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2020-07-20 11:16:05,368 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2020-07-20 11:16:05,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:05,831 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2020-07-20 11:16:05,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 11:16:05,833 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2020-07-20 11:16:05,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:05,834 INFO L225 Difference]: With dead ends: 63 [2020-07-20 11:16:05,834 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 11:16:05,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 11:16:05,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 11:16:05,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 11:16:05,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 11:16:05,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 11:16:05,836 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 109 [2020-07-20 11:16:05,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:05,837 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 11:16:05,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 11:16:05,837 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 11:16:05,837 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 11:16:06,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:06,042 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 11:16:06,132 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 11:16:06,132 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:16:06,132 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 11:16:06,132 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 11:16:06,133 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 11:16:06,133 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 11:16:06,133 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-07-20 11:16:06,133 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 9 15) the Hoare annotation is: true [2020-07-20 11:16:06,133 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 9 15) no Hoare annotation was computed. [2020-07-20 11:16:06,133 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-20 11:16:06,133 INFO L268 CegarLoopResult]: For program point L12(lines 12 14) no Hoare annotation was computed. [2020-07-20 11:16:06,134 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= 15 main_~input~0) (<= main_~input~0 15)) [2020-07-20 11:16:06,134 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-20 11:16:06,134 INFO L268 CegarLoopResult]: For program point L12-2(lines 9 15) no Hoare annotation was computed. [2020-07-20 11:16:06,134 INFO L268 CegarLoopResult]: For program point idFINAL(lines 4 7) no Hoare annotation was computed. [2020-07-20 11:16:06,134 INFO L268 CegarLoopResult]: For program point idEXIT(lines 4 7) no Hoare annotation was computed. [2020-07-20 11:16:06,135 INFO L271 CegarLoopResult]: At program point idENTRY(lines 4 7) the Hoare annotation is: true [2020-07-20 11:16:06,135 INFO L264 CegarLoopResult]: At program point L6(line 6) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-20 11:16:06,136 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-07-20 11:16:06,136 INFO L268 CegarLoopResult]: For program point L6-1(line 6) no Hoare annotation was computed. [2020-07-20 11:16:06,143 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:16:06 BoogieIcfgContainer [2020-07-20 11:16:06,143 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:16:06,149 INFO L168 Benchmark]: Toolchain (without parser) took 114221.37 ms. Allocated memory was 137.9 MB in the beginning and 535.3 MB in the end (delta: 397.4 MB). Free memory was 101.1 MB in the beginning and 209.3 MB in the end (delta: -108.2 MB). Peak memory consumption was 289.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,153 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,153 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.87 ms. Allocated memory is still 137.9 MB. Free memory was 100.6 MB in the beginning and 91.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,154 INFO L168 Benchmark]: Boogie Preprocessor took 30.22 ms. Allocated memory is still 137.9 MB. Free memory was 91.5 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,156 INFO L168 Benchmark]: RCFGBuilder took 386.06 ms. Allocated memory was 137.9 MB in the beginning and 205.5 MB in the end (delta: 67.6 MB). Free memory was 90.2 MB in the beginning and 174.0 MB in the end (delta: -83.8 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,157 INFO L168 Benchmark]: TraceAbstraction took 113510.18 ms. Allocated memory was 205.5 MB in the beginning and 535.3 MB in the end (delta: 329.8 MB). Free memory was 174.0 MB in the beginning and 209.3 MB in the end (delta: -35.3 MB). Peak memory consumption was 294.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:16:06,161 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 137.9 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 287.87 ms. Allocated memory is still 137.9 MB. Free memory was 100.6 MB in the beginning and 91.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.22 ms. Allocated memory is still 137.9 MB. Free memory was 91.5 MB in the beginning and 90.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 386.06 ms. Allocated memory was 137.9 MB in the beginning and 205.5 MB in the end (delta: 67.6 MB). Free memory was 90.2 MB in the beginning and 174.0 MB in the end (delta: -83.8 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 113510.18 ms. Allocated memory was 205.5 MB in the beginning and 535.3 MB in the end (delta: 329.8 MB). Free memory was 174.0 MB in the beginning and 209.3 MB in the end (delta: -35.3 MB). Peak memory consumption was 294.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 13]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 113.3s, OverallIterations: 17, TraceHistogramMax: 17, AutomataDifference: 4.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 285 SDtfs, 1548 SDslu, 2904 SDs, 0 SdLazy, 1632 SolverSat, 655 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2072 GetRequests, 1362 SyntacticMatches, 239 SemanticMatches, 471 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3674 ImplicationChecksByTransitivity, 9.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=16, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 17 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 9 PreInvPairs, 9 NumberOfFragments, 19 HoareAnnotationTreeSize, 9 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 100.8s InterpolantComputationTime, 1037 NumberOfCodeBlocks, 1037 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 1920 ConstructedInterpolants, 0 QuantifiedInterpolants, 399960 SizeOfPredicates, 153 NumberOfNonLiveVariables, 2431 ConjunctsInSsa, 373 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 3609/8464 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...