/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_srvr_11.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 06:02:23,487 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 06:02:23,490 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 06:02:23,503 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-24 06:02:23,512 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 06:02:23,513 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 06:02:23,514 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 06:02:23,515 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 06:02:23,516 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 06:02:23,517 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 06:02:23,519 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 06:02:23,521 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 06:02:23,522 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 06:02:23,523 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 06:02:23,524 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 06:02:23,525 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 06:02:23,527 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 06:02:23,537 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 06:02:23,557 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 06:02:23,558 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 06:02:23,561 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 06:02:23,561 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 06:02:23,561 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 06:02:23,562 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 06:02:23,562 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 06:02:23,562 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 06:02:23,562 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 06:02:23,562 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 06:02:23,563 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 06:02:23,563 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 06:02:23,563 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 06:02:23,563 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 06:02:23,563 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 06:02:23,564 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 06:02:23,564 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 06:02:23,564 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 06:02:23,565 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 06:02:23,566 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 06:02:23,566 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 06:02:23,566 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 06:02:23,566 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 06:02:23,567 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 06:02:23,567 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 06:02:23,567 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 06:02:23,567 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 06:02:23,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 06:02:23,568 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 06:02:23,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 06:02:23,569 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 06:02:23,569 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 06:02:23,569 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 06:02:23,569 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 06:02:23,570 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 06:02:23,570 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 06:02:23,570 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 06:02:23,570 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 06:02:23,845 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 06:02:23,864 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 06:02:23,868 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 06:02:23,870 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 06:02:23,870 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 06:02:23,871 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ssh-simplified/s3_srvr_11.cil.c [2019-11-24 06:02:23,942 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22d49bde3/1821bd1726f647f4884a58407c6915d8/FLAGa8752e27e [2019-11-24 06:02:24,465 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 06:02:24,466 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ssh-simplified/s3_srvr_11.cil.c [2019-11-24 06:02:24,489 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22d49bde3/1821bd1726f647f4884a58407c6915d8/FLAGa8752e27e [2019-11-24 06:02:24,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/22d49bde3/1821bd1726f647f4884a58407c6915d8 [2019-11-24 06:02:24,801 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 06:02:24,802 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 06:02:24,803 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 06:02:24,803 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 06:02:24,807 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 06:02:24,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:02:24" (1/1) ... [2019-11-24 06:02:24,811 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63f15230 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:24, skipping insertion in model container [2019-11-24 06:02:24,811 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 06:02:24" (1/1) ... [2019-11-24 06:02:24,818 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 06:02:24,870 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 06:02:25,124 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:02:25,128 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 06:02:25,278 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 06:02:25,292 INFO L208 MainTranslator]: Completed translation [2019-11-24 06:02:25,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25 WrapperNode [2019-11-24 06:02:25,293 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 06:02:25,294 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 06:02:25,294 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 06:02:25,294 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 06:02:25,303 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,313 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,368 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 06:02:25,368 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 06:02:25,369 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 06:02:25,369 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 06:02:25,378 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,388 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,409 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,412 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (1/1) ... [2019-11-24 06:02:25,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 06:02:25,418 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 06:02:25,418 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 06:02:25,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 06:02:25,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (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 06:02:25,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 06:02:25,493 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 06:02:25,615 WARN L735 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-11-24 06:02:26,272 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##90: assume false; [2019-11-24 06:02:26,272 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##91: assume !false; [2019-11-24 06:02:26,548 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 06:02:26,548 INFO L284 CfgBuilder]: Removed 7 assume(true) statements. [2019-11-24 06:02:26,549 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:26 BoogieIcfgContainer [2019-11-24 06:02:26,550 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 06:02:26,551 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 06:02:26,551 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 06:02:26,554 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 06:02:26,554 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 06:02:24" (1/3) ... [2019-11-24 06:02:26,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33372b2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:26, skipping insertion in model container [2019-11-24 06:02:26,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 06:02:25" (2/3) ... [2019-11-24 06:02:26,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33372b2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 06:02:26, skipping insertion in model container [2019-11-24 06:02:26,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 06:02:26" (3/3) ... [2019-11-24 06:02:26,557 INFO L109 eAbstractionObserver]: Analyzing ICFG s3_srvr_11.cil.c [2019-11-24 06:02:26,567 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 06:02:26,574 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 06:02:26,586 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 06:02:26,616 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 06:02:26,616 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 06:02:26,617 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 06:02:26,617 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 06:02:26,617 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 06:02:26,617 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 06:02:26,618 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 06:02:26,618 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 06:02:26,644 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states. [2019-11-24 06:02:26,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-24 06:02:26,651 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:26,652 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 06:02:26,653 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:26,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:26,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1776652682, now seen corresponding path program 1 times [2019-11-24 06:02:26,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:26,666 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434229106] [2019-11-24 06:02:26,666 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:26,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:26,841 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 06:02:26,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434229106] [2019-11-24 06:02:26,843 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:26,843 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 06:02:26,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132043112] [2019-11-24 06:02:26,850 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:26,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:26,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:26,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:26,864 INFO L87 Difference]: Start difference. First operand 114 states. Second operand 3 states. [2019-11-24 06:02:27,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:27,150 INFO L93 Difference]: Finished difference Result 249 states and 436 transitions. [2019-11-24 06:02:27,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:27,154 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-11-24 06:02:27,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:27,177 INFO L225 Difference]: With dead ends: 249 [2019-11-24 06:02:27,177 INFO L226 Difference]: Without dead ends: 131 [2019-11-24 06:02:27,183 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 06:02:27,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2019-11-24 06:02:27,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 129. [2019-11-24 06:02:27,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2019-11-24 06:02:27,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 193 transitions. [2019-11-24 06:02:27,261 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 193 transitions. Word has length 19 [2019-11-24 06:02:27,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:27,262 INFO L462 AbstractCegarLoop]: Abstraction has 129 states and 193 transitions. [2019-11-24 06:02:27,263 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:27,263 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 193 transitions. [2019-11-24 06:02:27,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-24 06:02:27,264 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:27,265 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:27,265 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:27,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:27,266 INFO L82 PathProgramCache]: Analyzing trace with hash -130796344, now seen corresponding path program 1 times [2019-11-24 06:02:27,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:27,266 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503524488] [2019-11-24 06:02:27,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:27,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:27,362 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 06:02:27,362 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503524488] [2019-11-24 06:02:27,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:27,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:27,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299121914] [2019-11-24 06:02:27,365 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 06:02:27,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:27,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 06:02:27,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-24 06:02:27,367 INFO L87 Difference]: Start difference. First operand 129 states and 193 transitions. Second operand 4 states. [2019-11-24 06:02:27,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:27,553 INFO L93 Difference]: Finished difference Result 268 states and 400 transitions. [2019-11-24 06:02:27,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:02:27,554 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2019-11-24 06:02:27,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:27,555 INFO L225 Difference]: With dead ends: 268 [2019-11-24 06:02:27,556 INFO L226 Difference]: Without dead ends: 141 [2019-11-24 06:02:27,557 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:02:27,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-11-24 06:02:27,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 137. [2019-11-24 06:02:27,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2019-11-24 06:02:27,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 204 transitions. [2019-11-24 06:02:27,567 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 204 transitions. Word has length 24 [2019-11-24 06:02:27,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:27,568 INFO L462 AbstractCegarLoop]: Abstraction has 137 states and 204 transitions. [2019-11-24 06:02:27,568 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 06:02:27,568 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 204 transitions. [2019-11-24 06:02:27,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-24 06:02:27,570 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:27,570 INFO L410 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2019-11-24 06:02:27,570 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:27,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:27,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1861462646, now seen corresponding path program 1 times [2019-11-24 06:02:27,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:27,571 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378875849] [2019-11-24 06:02:27,571 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:27,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:27,628 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:27,628 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378875849] [2019-11-24 06:02:27,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:27,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:27,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612566043] [2019-11-24 06:02:27,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:27,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:27,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:27,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:27,631 INFO L87 Difference]: Start difference. First operand 137 states and 204 transitions. Second operand 3 states. [2019-11-24 06:02:27,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:27,858 INFO L93 Difference]: Finished difference Result 325 states and 499 transitions. [2019-11-24 06:02:27,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:27,858 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 34 [2019-11-24 06:02:27,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:27,860 INFO L225 Difference]: With dead ends: 325 [2019-11-24 06:02:27,861 INFO L226 Difference]: Without dead ends: 178 [2019-11-24 06:02:27,862 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 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 06:02:27,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2019-11-24 06:02:27,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 175. [2019-11-24 06:02:27,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2019-11-24 06:02:27,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 256 transitions. [2019-11-24 06:02:27,874 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 256 transitions. Word has length 34 [2019-11-24 06:02:27,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:27,875 INFO L462 AbstractCegarLoop]: Abstraction has 175 states and 256 transitions. [2019-11-24 06:02:27,875 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:27,875 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 256 transitions. [2019-11-24 06:02:27,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-24 06:02:27,877 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:27,877 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 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 06:02:27,877 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:27,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:27,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1971056475, now seen corresponding path program 1 times [2019-11-24 06:02:27,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:27,878 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738091635] [2019-11-24 06:02:27,879 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:27,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:28,030 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:28,031 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738091635] [2019-11-24 06:02:28,031 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040443013] [2019-11-24 06:02:28,031 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 06:02:28,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:28,112 INFO L255 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-24 06:02:28,122 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:28,149 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:28,149 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:28,174 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:28,176 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825377358] [2019-11-24 06:02:28,201 INFO L159 IcfgInterpreter]: Started Sifa with 31 locations of interest [2019-11-24 06:02:28,201 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:02:28,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:02:28,220 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:02:28,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:02:28,559 WARN L192 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 216 [2019-11-24 06:02:28,785 WARN L192 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 243 [2019-11-24 06:02:29,096 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 238 DAG size of output: 238 [2019-11-24 06:02:29,725 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 239 [2019-11-24 06:02:30,422 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 248 [2019-11-24 06:02:30,936 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 238 [2019-11-24 06:02:31,352 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:02:31,997 WARN L192 SmtUtils]: Spent 620.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 147 [2019-11-24 06:02:34,288 WARN L192 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 242 DAG size of output: 184 [2019-11-24 06:02:36,609 WARN L192 SmtUtils]: Spent 2.24 s on a formula simplification. DAG size of input: 238 DAG size of output: 183 [2019-11-24 06:02:38,077 WARN L192 SmtUtils]: Spent 674.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 151 [2019-11-24 06:02:38,832 WARN L192 SmtUtils]: Spent 702.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 154 [2019-11-24 06:02:41,113 WARN L192 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 236 DAG size of output: 180 [2019-11-24 06:02:43,438 WARN L192 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 236 DAG size of output: 180 [2019-11-24 06:02:46,440 WARN L192 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 260 DAG size of output: 173 [2019-11-24 06:02:48,073 WARN L192 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 266 DAG size of output: 161 [2019-11-24 06:02:49,602 WARN L192 SmtUtils]: Spent 1.39 s on a formula simplification. DAG size of input: 269 DAG size of output: 165 [2019-11-24 06:02:49,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:02:49,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [4, 4, 4] total 16 [2019-11-24 06:02:49,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285888198] [2019-11-24 06:02:49,607 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-24 06:02:49,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:49,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-24 06:02:49,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2019-11-24 06:02:49,609 INFO L87 Difference]: Start difference. First operand 175 states and 256 transitions. Second operand 12 states. [2019-11-24 06:02:50,733 WARN L192 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 185 DAG size of output: 150 [2019-11-24 06:02:54,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:54,339 INFO L93 Difference]: Finished difference Result 436 states and 646 transitions. [2019-11-24 06:02:54,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-24 06:02:54,339 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2019-11-24 06:02:54,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:54,341 INFO L225 Difference]: With dead ends: 436 [2019-11-24 06:02:54,341 INFO L226 Difference]: Without dead ends: 250 [2019-11-24 06:02:54,342 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 95 SyntacticMatches, 19 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2019-11-24 06:02:54,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2019-11-24 06:02:54,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 241. [2019-11-24 06:02:54,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2019-11-24 06:02:54,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 325 transitions. [2019-11-24 06:02:54,360 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 325 transitions. Word has length 42 [2019-11-24 06:02:54,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:54,361 INFO L462 AbstractCegarLoop]: Abstraction has 241 states and 325 transitions. [2019-11-24 06:02:54,361 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-24 06:02:54,361 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 325 transitions. [2019-11-24 06:02:54,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-24 06:02:54,363 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:54,363 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1] [2019-11-24 06:02:54,564 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:02:54,564 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:54,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:54,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1364123407, now seen corresponding path program 1 times [2019-11-24 06:02:54,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:54,565 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410558516] [2019-11-24 06:02:54,565 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:54,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:54,630 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:54,631 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410558516] [2019-11-24 06:02:54,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:54,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:54,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766576882] [2019-11-24 06:02:54,632 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:54,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:54,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:54,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:54,632 INFO L87 Difference]: Start difference. First operand 241 states and 325 transitions. Second operand 3 states. [2019-11-24 06:02:54,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:54,653 INFO L93 Difference]: Finished difference Result 571 states and 809 transitions. [2019-11-24 06:02:54,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:54,653 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 45 [2019-11-24 06:02:54,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:54,656 INFO L225 Difference]: With dead ends: 571 [2019-11-24 06:02:54,656 INFO L226 Difference]: Without dead ends: 398 [2019-11-24 06:02:54,657 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 06:02:54,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2019-11-24 06:02:54,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 396. [2019-11-24 06:02:54,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2019-11-24 06:02:54,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 550 transitions. [2019-11-24 06:02:54,677 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 550 transitions. Word has length 45 [2019-11-24 06:02:54,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:54,678 INFO L462 AbstractCegarLoop]: Abstraction has 396 states and 550 transitions. [2019-11-24 06:02:54,678 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:54,678 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 550 transitions. [2019-11-24 06:02:54,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-24 06:02:54,680 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:54,680 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1] [2019-11-24 06:02:54,681 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:54,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:54,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1972664961, now seen corresponding path program 1 times [2019-11-24 06:02:54,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:54,682 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216566127] [2019-11-24 06:02:54,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:54,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:54,743 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:54,743 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216566127] [2019-11-24 06:02:54,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:54,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:02:54,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81504120] [2019-11-24 06:02:54,745 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:02:54,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:54,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:02:54,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:02:54,745 INFO L87 Difference]: Start difference. First operand 396 states and 550 transitions. Second operand 3 states. [2019-11-24 06:02:54,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:54,779 INFO L93 Difference]: Finished difference Result 596 states and 844 transitions. [2019-11-24 06:02:54,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:02:54,779 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 46 [2019-11-24 06:02:54,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:54,782 INFO L225 Difference]: With dead ends: 596 [2019-11-24 06:02:54,782 INFO L226 Difference]: Without dead ends: 423 [2019-11-24 06:02:54,783 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 06:02:54,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2019-11-24 06:02:54,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 402. [2019-11-24 06:02:54,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2019-11-24 06:02:54,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 554 transitions. [2019-11-24 06:02:54,803 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 554 transitions. Word has length 46 [2019-11-24 06:02:54,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:54,803 INFO L462 AbstractCegarLoop]: Abstraction has 402 states and 554 transitions. [2019-11-24 06:02:54,803 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:02:54,803 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 554 transitions. [2019-11-24 06:02:54,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-24 06:02:54,805 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:54,805 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 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 06:02:54,805 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:54,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:54,805 INFO L82 PathProgramCache]: Analyzing trace with hash 120374741, now seen corresponding path program 1 times [2019-11-24 06:02:54,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:54,806 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [844142720] [2019-11-24 06:02:54,806 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:54,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:54,870 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-24 06:02:54,870 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [844142720] [2019-11-24 06:02:54,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:02:54,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 06:02:54,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780346599] [2019-11-24 06:02:54,873 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 06:02:54,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:02:54,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 06:02:54,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-24 06:02:54,874 INFO L87 Difference]: Start difference. First operand 402 states and 554 transitions. Second operand 4 states. [2019-11-24 06:02:55,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:02:55,043 INFO L93 Difference]: Finished difference Result 769 states and 1079 transitions. [2019-11-24 06:02:55,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 06:02:55,044 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 48 [2019-11-24 06:02:55,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:02:55,047 INFO L225 Difference]: With dead ends: 769 [2019-11-24 06:02:55,047 INFO L226 Difference]: Without dead ends: 434 [2019-11-24 06:02:55,049 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-24 06:02:55,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2019-11-24 06:02:55,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 412. [2019-11-24 06:02:55,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2019-11-24 06:02:55,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 566 transitions. [2019-11-24 06:02:55,069 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 566 transitions. Word has length 48 [2019-11-24 06:02:55,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:02:55,070 INFO L462 AbstractCegarLoop]: Abstraction has 412 states and 566 transitions. [2019-11-24 06:02:55,070 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 06:02:55,070 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 566 transitions. [2019-11-24 06:02:55,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-24 06:02:55,071 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:02:55,072 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:02:55,072 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:02:55,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:02:55,072 INFO L82 PathProgramCache]: Analyzing trace with hash 1662101072, now seen corresponding path program 1 times [2019-11-24 06:02:55,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:02:55,073 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182781845] [2019-11-24 06:02:55,073 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:02:55,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:55,134 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182781845] [2019-11-24 06:02:55,134 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066585199] [2019-11-24 06:02:55,134 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 06:02:55,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:02:55,200 INFO L255 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 06:02:55,203 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:02:55,228 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:02:55,228 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:02:55,281 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-24 06:02:55,281 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [732539812] [2019-11-24 06:02:55,284 INFO L159 IcfgInterpreter]: Started Sifa with 50 locations of interest [2019-11-24 06:02:55,284 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:02:55,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:02:55,285 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:02:55,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:02:55,801 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 251 [2019-11-24 06:02:56,054 WARN L192 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 282 DAG size of output: 282 [2019-11-24 06:02:56,265 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 276 DAG size of output: 263 [2019-11-24 06:02:56,621 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 287 [2019-11-24 06:02:56,750 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 287 [2019-11-24 06:02:56,876 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 287 [2019-11-24 06:02:57,159 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 274 [2019-11-24 06:02:57,548 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:57,665 WARN L192 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:57,877 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:57,987 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:58,187 WARN L192 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:58,312 WARN L192 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 277 DAG size of output: 277 [2019-11-24 06:02:58,920 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:02:59,544 WARN L192 SmtUtils]: Spent 606.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 147 [2019-11-24 06:03:03,662 WARN L192 SmtUtils]: Spent 4.05 s on a formula simplification. DAG size of input: 286 DAG size of output: 200 [2019-11-24 06:03:06,398 WARN L192 SmtUtils]: Spent 2.66 s on a formula simplification. DAG size of input: 273 DAG size of output: 197 [2019-11-24 06:03:08,405 WARN L192 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 277 DAG size of output: 152 [2019-11-24 06:03:09,633 WARN L192 SmtUtils]: Spent 1.11 s on a formula simplification. DAG size of input: 272 DAG size of output: 155 [2019-11-24 06:03:11,778 WARN L192 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 212 DAG size of output: 186 [2019-11-24 06:03:13,957 WARN L192 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 213 DAG size of output: 183 [2019-11-24 06:03:16,217 WARN L192 SmtUtils]: Spent 2.02 s on a formula simplification. DAG size of input: 213 DAG size of output: 179 [2019-11-24 06:03:21,640 WARN L192 SmtUtils]: Spent 5.27 s on a formula simplification. DAG size of input: 242 DAG size of output: 191 [2019-11-24 06:03:25,695 WARN L192 SmtUtils]: Spent 2.96 s on a formula simplification. DAG size of input: 277 DAG size of output: 185 [2019-11-24 06:03:27,762 WARN L192 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 277 DAG size of output: 165 [2019-11-24 06:03:29,055 WARN L192 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 280 DAG size of output: 160 [2019-11-24 06:03:33,115 WARN L192 SmtUtils]: Spent 2.47 s on a formula simplification. DAG size of input: 278 DAG size of output: 176 [2019-11-24 06:03:36,668 WARN L192 SmtUtils]: Spent 3.19 s on a formula simplification. DAG size of input: 282 DAG size of output: 169 [2019-11-24 06:03:40,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-24 06:03:40,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [4, 4, 3] total 21 [2019-11-24 06:03:40,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453983930] [2019-11-24 06:03:40,233 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-24 06:03:40,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:03:40,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-24 06:03:40,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2019-11-24 06:03:40,234 INFO L87 Difference]: Start difference. First operand 412 states and 566 transitions. Second operand 16 states. [2019-11-24 06:03:41,520 WARN L192 SmtUtils]: Spent 1.20 s on a formula simplification. DAG size of input: 199 DAG size of output: 150 [2019-11-24 06:03:46,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:03:46,423 INFO L93 Difference]: Finished difference Result 668 states and 940 transitions. [2019-11-24 06:03:46,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-24 06:03:46,424 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2019-11-24 06:03:46,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:03:46,428 INFO L225 Difference]: With dead ends: 668 [2019-11-24 06:03:46,428 INFO L226 Difference]: Without dead ends: 474 [2019-11-24 06:03:46,429 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 165 SyntacticMatches, 51 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 42.6s TimeCoverageRelationStatistics Valid=126, Invalid=380, Unknown=0, NotChecked=0, Total=506 [2019-11-24 06:03:46,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2019-11-24 06:03:46,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 470. [2019-11-24 06:03:46,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 470 states. [2019-11-24 06:03:46,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 627 transitions. [2019-11-24 06:03:46,455 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 627 transitions. Word has length 78 [2019-11-24 06:03:46,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:03:46,456 INFO L462 AbstractCegarLoop]: Abstraction has 470 states and 627 transitions. [2019-11-24 06:03:46,456 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-24 06:03:46,456 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 627 transitions. [2019-11-24 06:03:46,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-24 06:03:46,457 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:03:46,458 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:03:46,662 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:03:46,662 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:03:46,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:03:46,663 INFO L82 PathProgramCache]: Analyzing trace with hash -105997651, now seen corresponding path program 1 times [2019-11-24 06:03:46,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:03:46,664 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225998247] [2019-11-24 06:03:46,664 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:03:46,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:03:46,721 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:03:46,722 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225998247] [2019-11-24 06:03:46,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 06:03:46,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 06:03:46,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982956763] [2019-11-24 06:03:46,723 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-24 06:03:46,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 06:03:46,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-24 06:03:46,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-24 06:03:46,726 INFO L87 Difference]: Start difference. First operand 470 states and 627 transitions. Second operand 3 states. [2019-11-24 06:03:46,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 06:03:46,753 INFO L93 Difference]: Finished difference Result 833 states and 1140 transitions. [2019-11-24 06:03:46,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-24 06:03:46,754 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 79 [2019-11-24 06:03:46,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 06:03:46,757 INFO L225 Difference]: With dead ends: 833 [2019-11-24 06:03:46,758 INFO L226 Difference]: Without dead ends: 649 [2019-11-24 06:03:46,758 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 06:03:46,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2019-11-24 06:03:46,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 647. [2019-11-24 06:03:46,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 647 states. [2019-11-24 06:03:46,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 875 transitions. [2019-11-24 06:03:46,788 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 875 transitions. Word has length 79 [2019-11-24 06:03:46,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 06:03:46,788 INFO L462 AbstractCegarLoop]: Abstraction has 647 states and 875 transitions. [2019-11-24 06:03:46,788 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-24 06:03:46,788 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 875 transitions. [2019-11-24 06:03:46,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2019-11-24 06:03:46,790 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 06:03:46,790 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 06:03:46,790 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 06:03:46,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 06:03:46,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1375664380, now seen corresponding path program 1 times [2019-11-24 06:03:46,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 06:03:46,791 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697159775] [2019-11-24 06:03:46,791 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 06:03:46,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:03:46,844 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:03:46,844 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697159775] [2019-11-24 06:03:46,845 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090624624] [2019-11-24 06:03:46,845 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-24 06:03:46,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 06:03:46,905 INFO L255 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-24 06:03:46,908 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 06:03:46,929 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 06:03:46,930 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 06:03:46,978 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-24 06:03:46,978 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281612345] [2019-11-24 06:03:46,980 INFO L159 IcfgInterpreter]: Started Sifa with 51 locations of interest [2019-11-24 06:03:46,980 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 06:03:46,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 06:03:46,981 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 06:03:46,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 06:03:47,519 WARN L192 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 305 DAG size of output: 305 [2019-11-24 06:03:47,718 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 295 [2019-11-24 06:03:47,904 WARN L192 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 295 [2019-11-24 06:03:48,098 WARN L192 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 295 [2019-11-24 06:03:48,336 WARN L192 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 310 [2019-11-24 06:03:48,438 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 310 [2019-11-24 06:03:49,885 WARN L192 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 255 [2019-11-24 06:03:50,049 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 255 [2019-11-24 06:03:50,213 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 253 [2019-11-24 06:03:50,392 WARN L192 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 255 [2019-11-24 06:03:50,568 WARN L192 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 260 DAG size of output: 255 [2019-11-24 06:03:50,732 WARN L192 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 253 [2019-11-24 06:03:50,789 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-24 06:03:51,425 WARN L192 SmtUtils]: Spent 611.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 147 [2019-11-24 06:03:54,322 WARN L192 SmtUtils]: Spent 2.83 s on a formula simplification. DAG size of input: 309 DAG size of output: 209 [2019-11-24 06:03:56,995 WARN L192 SmtUtils]: Spent 2.59 s on a formula simplification. DAG size of input: 269 DAG size of output: 204