/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/ssh-simplified/s3_clnt_4.cil-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 06:01:57,990 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 06:01:57,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 06:01:58,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-24 06:01:58,018 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 06:01:58,019 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 06:01:58,020 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 06:01:58,021 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 06:01:58,022 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 06:01:58,023 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 06:01:58,024 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 06:01:58,026 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 06:01:58,028 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 06:01:58,031 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 06:01:58,032 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 06:01:58,033 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 06:01:58,037 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 06:01:58,053 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-24 06:01:58,076 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 06:01:58,076 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 06:01:58,077 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 06:01:58,077 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 06:01:58,077 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 06:01:58,077 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 06:01:58,077 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 06:01:58,078 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 06:01:58,078 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 06:01:58,078 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 06:01:58,078 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 06:01:58,078 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 06:01:58,079 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 06:01:58,079 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 06:01:58,079 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 06:01:58,080 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 06:01:58,080 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 06:01:58,080 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 06:01:58,080 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 06:01:58,081 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 06:01:58,081 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 06:01:58,081 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 06:01:58,081 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 06:01:58,081 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 06:01:58,082 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 06:01:58,082 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 06:01:58,082 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 06:01:58,082 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 06:01:58,083 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 06:01:58,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 06:01:58,083 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 06:01:58,083 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 06:01:58,083 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 06:01:58,084 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 06:01:58,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 06:01:58,084 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 06:01:58,084 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 06:01:58,084 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 06:01:58,395 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 06:01:58,417 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 06:01:58,421 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 06:01:58,422 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 06:01:58,422 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 06:01:58,423 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ssh-simplified/s3_clnt_4.cil-2.c [2019-11-24 06:01:58,490 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/766093436/9ae4001d3e8f4408b98f5a41fd0aeb1c/FLAG11e941269 [2019-11-24 06:01:58,988 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 06:01:58,989 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ssh-simplified/s3_clnt_4.cil-2.c [2019-11-24 06:01:59,006 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/766093436/9ae4001d3e8f4408b98f5a41fd0aeb1c/FLAG11e941269 [2019-11-24 06:01:59,361 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/766093436/9ae4001d3e8f4408b98f5a41fd0aeb1c [2019-11-24 06:01:59,369 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 06:01:59,371 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 06:01:59,372 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:59,372 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 06:01:59,375 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 06:01:59,376 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,379 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48caa14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59, skipping insertion in model container [2019-11-24 06:01:59,379 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,386 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 06:01:59,441 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 06:01:59,682 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:59,686 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 06:01:59,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:01:59,878 INFO L208 MainTranslator]: Completed translation [2019-11-24 06:01:59,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59 WrapperNode [2019-11-24 06:01:59,878 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 06:01:59,879 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:59,879 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 06:01:59,879 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 06:01:59,886 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,895 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,938 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 06:01:59,939 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 06:01:59,939 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 06:01:59,939 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 06:01:59,952 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,960 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,961 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,968 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (1/1) ... [2019-11-24 06:01:59,984 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 06:01:59,985 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 06:01:59,985 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 06:01:59,985 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 06:01:59,986 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (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 [2019-11-24 06:02:00,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 06:02:00,058 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 06:02:00,178 WARN L735 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-11-24 06:02:00,851 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##85: assume !false; [2019-11-24 06:02:00,851 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume false; [2019-11-24 06:02:01,182 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 06:02:01,183 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-24 06:02:01,184 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:01 BoogieIcfgContainer [2019-11-24 06:02:01,184 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 06:02:01,185 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 06:02:01,185 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 06:02:01,189 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 06:02:01,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 06:01:59" (1/3) ... [2019-11-24 06:02:01,190 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2325f25e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:01, skipping insertion in model container [2019-11-24 06:02:01,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:01:59" (2/3) ... [2019-11-24 06:02:01,191 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2325f25e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:01, skipping insertion in model container [2019-11-24 06:02:01,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:01" (3/3) ... [2019-11-24 06:02:01,193 INFO L109 eAbstractionObserver]: Analyzing ICFG s3_clnt_4.cil-2.c [2019-11-24 06:02:01,204 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 06:02:01,213 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 06:02:01,226 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 06:02:01,254 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 06:02:01,254 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 06:02:01,254 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 06:02:01,254 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 06:02:01,255 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 06:02:01,255 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 06:02:01,255 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 06:02:01,255 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 06:02:01,279 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states. [2019-11-24 06:02:01,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 06:02:01,286 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:01,287 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:01,288 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:01,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:01,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1584347361, now seen corresponding path program 1 times [2019-11-24 06:02:01,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:01,306 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594982850] [2019-11-24 06:02:01,306 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:01,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:01,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:01,490 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594982850] [2019-11-24 06:02:01,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:01,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:02:01,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083660899] [2019-11-24 06:02:01,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:01,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:01,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:01,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:01,514 INFO L87 Difference]: Start difference. First operand 85 states. Second operand 3 states. [2019-11-24 06:02:01,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:01,692 INFO L93 Difference]: Finished difference Result 171 states and 295 transitions. [2019-11-24 06:02:01,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:01,694 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-24 06:02:01,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:01,706 INFO L225 Difference]: With dead ends: 171 [2019-11-24 06:02:01,706 INFO L226 Difference]: Without dead ends: 84 [2019-11-24 06:02:01,710 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:01,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-24 06:02:01,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-24 06:02:01,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-24 06:02:01,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2019-11-24 06:02:01,754 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 19 [2019-11-24 06:02:01,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:01,755 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2019-11-24 06:02:01,756 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:01,756 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2019-11-24 06:02:01,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-24 06:02:01,757 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:01,757 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:01,758 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:01,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:01,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1189841522, now seen corresponding path program 1 times [2019-11-24 06:02:01,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:01,759 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386384267] [2019-11-24 06:02:01,759 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:01,880 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386384267] [2019-11-24 06:02:01,880 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:01,880 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:01,881 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801484220] [2019-11-24 06:02:01,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:01,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:01,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:01,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:01,884 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand 3 states. [2019-11-24 06:02:02,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:02,054 INFO L93 Difference]: Finished difference Result 180 states and 263 transitions. [2019-11-24 06:02:02,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:02,055 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2019-11-24 06:02:02,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:02,056 INFO L225 Difference]: With dead ends: 180 [2019-11-24 06:02:02,057 INFO L226 Difference]: Without dead ends: 99 [2019-11-24 06:02:02,058 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:02,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-24 06:02:02,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2019-11-24 06:02:02,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-11-24 06:02:02,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 137 transitions. [2019-11-24 06:02:02,070 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 137 transitions. Word has length 28 [2019-11-24 06:02:02,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:02,071 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 137 transitions. [2019-11-24 06:02:02,071 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:02,071 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 137 transitions. [2019-11-24 06:02:02,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-24 06:02:02,075 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:02,075 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:02,076 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:02,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:02,076 INFO L82 PathProgramCache]: Analyzing trace with hash -615899664, now seen corresponding path program 1 times [2019-11-24 06:02:02,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:02,077 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469635657] [2019-11-24 06:02:02,077 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:02,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,186 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:02,186 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469635657] [2019-11-24 06:02:02,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:02,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:02,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254524288] [2019-11-24 06:02:02,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:02,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:02,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:02,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:02,189 INFO L87 Difference]: Start difference. First operand 97 states and 137 transitions. Second operand 3 states. [2019-11-24 06:02:02,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:02,338 INFO L93 Difference]: Finished difference Result 208 states and 299 transitions. [2019-11-24 06:02:02,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:02,338 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 39 [2019-11-24 06:02:02,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:02,340 INFO L225 Difference]: With dead ends: 208 [2019-11-24 06:02:02,341 INFO L226 Difference]: Without dead ends: 114 [2019-11-24 06:02:02,342 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:02,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-24 06:02:02,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-11-24 06:02:02,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-11-24 06:02:02,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 155 transitions. [2019-11-24 06:02:02,352 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 155 transitions. Word has length 39 [2019-11-24 06:02:02,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:02,353 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 155 transitions. [2019-11-24 06:02:02,353 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:02,353 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 155 transitions. [2019-11-24 06:02:02,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-24 06:02:02,356 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:02,356 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:02,356 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:02,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:02,357 INFO L82 PathProgramCache]: Analyzing trace with hash -200842674, now seen corresponding path program 1 times [2019-11-24 06:02:02,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:02,358 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692147300] [2019-11-24 06:02:02,358 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:02,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,490 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-24 06:02:02,491 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692147300] [2019-11-24 06:02:02,491 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722525465] [2019-11-24 06:02:02,491 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:02,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:02,602 INFO L255 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 06:02:02,617 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:02,681 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:02:02,682 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:02,717 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-24 06:02:02,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-24 06:02:02,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2019-11-24 06:02:02,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878840729] [2019-11-24 06:02:02,719 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-24 06:02:02,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:02,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-24 06:02:02,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:02:02,720 INFO L87 Difference]: Start difference. First operand 112 states and 155 transitions. Second operand 6 states. [2019-11-24 06:02:03,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:03,061 INFO L93 Difference]: Finished difference Result 315 states and 470 transitions. [2019-11-24 06:02:03,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:02:03,061 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2019-11-24 06:02:03,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:03,064 INFO L225 Difference]: With dead ends: 315 [2019-11-24 06:02:03,064 INFO L226 Difference]: Without dead ends: 205 [2019-11-24 06:02:03,065 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-11-24 06:02:03,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2019-11-24 06:02:03,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 187. [2019-11-24 06:02:03,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2019-11-24 06:02:03,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 256 transitions. [2019-11-24 06:02:03,078 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 256 transitions. Word has length 52 [2019-11-24 06:02:03,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:03,079 INFO L462 AbstractCegarLoop]: Abstraction has 187 states and 256 transitions. [2019-11-24 06:02:03,079 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-24 06:02:03,079 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 256 transitions. [2019-11-24 06:02:03,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-24 06:02:03,081 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:03,082 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:03,286 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:03,287 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:03,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:03,288 INFO L82 PathProgramCache]: Analyzing trace with hash 171720553, now seen corresponding path program 1 times [2019-11-24 06:02:03,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:03,289 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848069967] [2019-11-24 06:02:03,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:03,339 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2019-11-24 06:02:03,340 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848069967] [2019-11-24 06:02:03,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:03,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:03,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38223282] [2019-11-24 06:02:03,342 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:03,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:03,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:03,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:03,344 INFO L87 Difference]: Start difference. First operand 187 states and 256 transitions. Second operand 3 states. [2019-11-24 06:02:03,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:03,458 INFO L93 Difference]: Finished difference Result 392 states and 545 transitions. [2019-11-24 06:02:03,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:03,459 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 68 [2019-11-24 06:02:03,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:03,461 INFO L225 Difference]: With dead ends: 392 [2019-11-24 06:02:03,461 INFO L226 Difference]: Without dead ends: 208 [2019-11-24 06:02:03,463 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:03,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2019-11-24 06:02:03,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2019-11-24 06:02:03,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2019-11-24 06:02:03,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 278 transitions. [2019-11-24 06:02:03,475 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 278 transitions. Word has length 68 [2019-11-24 06:02:03,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:03,476 INFO L462 AbstractCegarLoop]: Abstraction has 206 states and 278 transitions. [2019-11-24 06:02:03,476 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:03,476 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 278 transitions. [2019-11-24 06:02:03,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-24 06:02:03,478 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:03,478 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:03,479 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:03,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:03,479 INFO L82 PathProgramCache]: Analyzing trace with hash -956323728, now seen corresponding path program 1 times [2019-11-24 06:02:03,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:03,480 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662344524] [2019-11-24 06:02:03,480 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:03,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:03,586 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-24 06:02:03,587 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662344524] [2019-11-24 06:02:03,587 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283439917] [2019-11-24 06:02:03,587 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:03,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:03,672 INFO L255 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-24 06:02:03,682 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-11-24 06:02:03,701 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:03,723 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,735 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-24 06:02:03,766 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-24 06:02:03,767 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [209716274] [2019-11-24 06:02:03,819 INFO L159 IcfgInterpreter]: Started Sifa with 37 locations of interest [2019-11-24 06:02:03,820 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:02:03,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:02:03,835 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:02:03,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:02:04,196 WARN L192 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2019-11-24 06:02:04,685 WARN L192 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 244 DAG size of output: 244 [2019-11-24 06:02:05,162 WARN L192 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 231 [2019-11-24 06:02:05,270 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 231 [2019-11-24 06:02:05,424 WARN L192 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 253 [2019-11-24 06:02:05,564 WARN L192 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 253 [2019-11-24 06:02:05,754 WARN L192 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 253 [2019-11-24 06:02:05,988 WARN L192 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 264 [2019-11-24 06:02:06,337 WARN L192 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 265 DAG size of output: 265 [2019-11-24 06:02:06,780 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 258 [2019-11-24 06:02:07,987 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 294 DAG size of output: 281 [2019-11-24 06:02:08,149 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 296 [2019-11-24 06:02:08,326 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 282 [2019-11-24 06:02:08,434 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 282 [2019-11-24 06:02:08,681 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 282 [2019-11-24 06:02:08,921 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 282 [2019-11-24 06:02:09,074 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 299 [2019-11-24 06:02:09,265 WARN L192 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 299 [2019-11-24 06:02:09,416 WARN L192 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 299 [2019-11-24 06:02:10,138 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 289 DAG size of output: 283 [2019-11-24 06:02:10,357 WARN L192 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 289 DAG size of output: 283 [2019-11-24 06:02:10,495 WARN L192 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 283 [2019-11-24 06:02:10,640 WARN L192 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 290 [2019-11-24 06:02:10,754 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 290 DAG size of output: 290 [2019-11-24 06:02:10,882 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 290 [2019-11-24 06:02:10,995 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 290 [2019-11-24 06:02:11,120 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 290 [2019-11-24 06:02:11,229 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 290 [2019-11-24 06:02:11,358 WARN L192 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:11,492 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:11,606 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:11,740 WARN L192 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:11,857 WARN L192 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:11,973 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 324 [2019-11-24 06:02:12,158 WARN L192 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 330 DAG size of output: 330 [2019-11-24 06:02:12,341 WARN L192 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 330 DAG size of output: 330 [2019-11-24 06:02:12,504 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 330 [2019-11-24 06:02:13,080 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 285 [2019-11-24 06:02:13,185 WARN L192 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 285 [2019-11-24 06:02:13,435 WARN L192 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 285 [2019-11-24 06:02:13,964 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:02:19,505 WARN L192 SmtUtils]: Spent 5.43 s on a formula simplification. DAG size of input: 328 DAG size of output: 259 [2019-11-24 06:02:24,323 WARN L192 SmtUtils]: Spent 4.73 s on a formula simplification. DAG size of input: 283 DAG size of output: 251 [2019-11-24 06:02:25,123 WARN L192 SmtUtils]: Spent 706.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 160 [2019-11-24 06:02:25,983 WARN L192 SmtUtils]: Spent 795.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 166 [2019-11-24 06:02:26,849 WARN L192 SmtUtils]: Spent 789.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 167 [2019-11-24 06:02:27,738 WARN L192 SmtUtils]: Spent 807.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 169 [2019-11-24 06:02:28,629 WARN L192 SmtUtils]: Spent 799.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 171 [2019-11-24 06:02:33,093 WARN L192 SmtUtils]: Spent 4.32 s on a formula simplification. DAG size of input: 322 DAG size of output: 247 [2019-11-24 06:02:37,418 WARN L192 SmtUtils]: Spent 4.16 s on a formula simplification. DAG size of input: 323 DAG size of output: 248 [2019-11-24 06:02:43,163 WARN L192 SmtUtils]: Spent 5.59 s on a formula simplification. DAG size of input: 286 DAG size of output: 238 [2019-11-24 06:02:45,457 WARN L192 SmtUtils]: Spent 1.42 s on a formula simplification. DAG size of input: 297 DAG size of output: 189 [2019-11-24 06:02:47,219 WARN L192 SmtUtils]: Spent 1.58 s on a formula simplification. DAG size of input: 297 DAG size of output: 186 [2019-11-24 06:02:53,394 WARN L192 SmtUtils]: Spent 5.31 s on a formula simplification. DAG size of input: 298 DAG size of output: 231 [2019-11-24 06:02:55,290 WARN L192 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 301 DAG size of output: 191 [2019-11-24 06:02:57,158 WARN L192 SmtUtils]: Spent 1.66 s on a formula simplification. DAG size of input: 300 DAG size of output: 187 [2019-11-24 06:03:03,254 WARN L192 SmtUtils]: Spent 4.95 s on a formula simplification. DAG size of input: 302 DAG size of output: 226 [2019-11-24 06:03:04,985 WARN L192 SmtUtils]: Spent 1.29 s on a formula simplification. DAG size of input: 264 DAG size of output: 188 [2019-11-24 06:03:06,508 WARN L192 SmtUtils]: Spent 1.33 s on a formula simplification. DAG size of input: 266 DAG size of output: 190 [2019-11-24 06:03:08,076 WARN L192 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 272 DAG size of output: 196 [2019-11-24 06:03:14,374 WARN L192 SmtUtils]: Spent 4.89 s on a formula simplification. DAG size of input: 306 DAG size of output: 222 [2019-11-24 06:03:16,398 WARN L192 SmtUtils]: Spent 1.45 s on a formula simplification. DAG size of input: 309 DAG size of output: 196 [2019-11-24 06:03:18,135 WARN L192 SmtUtils]: Spent 1.48 s on a formula simplification. DAG size of input: 307 DAG size of output: 199 [2019-11-24 06:03:19,678 WARN L192 SmtUtils]: Spent 1.32 s on a formula simplification. DAG size of input: 250 DAG size of output: 193 [2019-11-24 06:03:25,183 WARN L192 SmtUtils]: Spent 3.75 s on a formula simplification. DAG size of input: 310 DAG size of output: 218 [2019-11-24 06:03:27,367 WARN L192 SmtUtils]: Spent 1.50 s on a formula simplification. DAG size of input: 313 DAG size of output: 198 [2019-11-24 06:03:29,116 WARN L192 SmtUtils]: Spent 1.46 s on a formula simplification. DAG size of input: 308 DAG size of output: 201 [2019-11-24 06:03:29,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:03:29,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [5, 4, 3] total 33 [2019-11-24 06:03:29,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536999051] [2019-11-24 06:03:29,120 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-24 06:03:29,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:03:29,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-24 06:03:29,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=894, Unknown=0, NotChecked=0, Total=1122 [2019-11-24 06:03:29,122 INFO L87 Difference]: Start difference. First operand 206 states and 278 transitions. Second operand 28 states. [2019-11-24 06:03:33,454 WARN L192 SmtUtils]: Spent 3.10 s on a formula simplification. DAG size of input: 275 DAG size of output: 244