/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/ldv-regression/test23-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 03:56:33,756 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 03:56:33,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 03:56:33,770 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-24 03:56:33,806 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 03:56:33,821 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 03:56:33,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 03:56:33,823 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 03:56:33,823 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 03:56:33,823 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 03:56:33,823 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 03:56:33,823 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 03:56:33,824 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 03:56:33,824 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 03:56:33,824 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 03:56:33,824 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 03:56:33,824 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 03:56:33,825 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 03:56:33,825 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 03:56:33,825 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 03:56:33,826 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 03:56:33,826 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 03:56:33,826 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 03:56:33,826 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 03:56:33,827 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 03:56:33,827 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 03:56:33,827 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 03:56:33,827 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 03:56:33,827 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 03:56:33,828 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 03:56:33,828 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 03:56:33,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 03:56:33,828 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 03:56:33,828 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 03:56:33,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 03:56:33,830 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 03:56:33,830 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 03:56:33,830 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 03:56:33,831 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 03:56:33,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 03:56:33,831 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 03:56:33,831 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 03:56:33,831 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 03:56:34,134 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 03:56:34,157 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 03:56:34,162 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 03:56:34,163 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 03:56:34,163 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 03:56:34,164 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test23-2.c [2019-11-24 03:56:34,227 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490a97d83/725d8d504ad74ab09f9c3a21a905c405/FLAG278b2a955 [2019-11-24 03:56:34,642 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 03:56:34,643 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test23-2.c [2019-11-24 03:56:34,650 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490a97d83/725d8d504ad74ab09f9c3a21a905c405/FLAG278b2a955 [2019-11-24 03:56:35,072 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/490a97d83/725d8d504ad74ab09f9c3a21a905c405 [2019-11-24 03:56:35,083 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 03:56:35,085 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 03:56:35,086 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 03:56:35,086 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 03:56:35,090 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 03:56:35,091 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,093 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1adb11ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35, skipping insertion in model container [2019-11-24 03:56:35,094 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,101 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 03:56:35,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 03:56:35,328 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 03:56:35,345 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 03:56:35,365 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 03:56:35,477 INFO L208 MainTranslator]: Completed translation [2019-11-24 03:56:35,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35 WrapperNode [2019-11-24 03:56:35,478 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 03:56:35,479 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 03:56:35,479 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 03:56:35,479 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 03:56:35,488 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,512 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,540 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 03:56:35,541 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 03:56:35,541 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 03:56:35,541 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 03:56:35,550 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,563 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,567 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,569 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... [2019-11-24 03:56:35,572 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 03:56:35,572 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 03:56:35,572 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 03:56:35,572 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 03:56:35,573 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 03:56:35,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-11-24 03:56:35,644 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 03:56:35,645 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-24 03:56:35,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 03:56:35,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 03:56:35,645 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-24 03:56:36,263 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 03:56:36,263 INFO L284 CfgBuilder]: Removed 13 assume(true) statements. [2019-11-24 03:56:36,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 03:56:36 BoogieIcfgContainer [2019-11-24 03:56:36,265 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 03:56:36,266 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 03:56:36,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 03:56:36,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 03:56:36,270 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 03:56:35" (1/3) ... [2019-11-24 03:56:36,271 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e7726ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 03:56:36, skipping insertion in model container [2019-11-24 03:56:36,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 03:56:35" (2/3) ... [2019-11-24 03:56:36,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e7726ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 03:56:36, skipping insertion in model container [2019-11-24 03:56:36,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 03:56:36" (3/3) ... [2019-11-24 03:56:36,274 INFO L109 eAbstractionObserver]: Analyzing ICFG test23-2.c [2019-11-24 03:56:36,284 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 03:56:36,291 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 03:56:36,300 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 03:56:36,321 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 03:56:36,322 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 03:56:36,322 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 03:56:36,322 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 03:56:36,322 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 03:56:36,322 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 03:56:36,323 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 03:56:36,323 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 03:56:36,337 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2019-11-24 03:56:36,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-24 03:56:36,344 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 03:56:36,345 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-24 03:56:36,345 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 03:56:36,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 03:56:36,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1436432940, now seen corresponding path program 1 times [2019-11-24 03:56:36,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 03:56:36,359 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626496681] [2019-11-24 03:56:36,359 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 03:56:36,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 03:56:36,551 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 03:56:36,552 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626496681] [2019-11-24 03:56:36,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 03:56:36,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-24 03:56:36,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291737345] [2019-11-24 03:56:36,561 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-24 03:56:36,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 03:56:36,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-24 03:56:36,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 03:56:36,580 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 2 states. [2019-11-24 03:56:36,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 03:56:36,600 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2019-11-24 03:56:36,600 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-24 03:56:36,602 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 6 [2019-11-24 03:56:36,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 03:56:36,613 INFO L225 Difference]: With dead ends: 18 [2019-11-24 03:56:36,613 INFO L226 Difference]: Without dead ends: 8 [2019-11-24 03:56:36,619 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-24 03:56:36,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-11-24 03:56:36,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2019-11-24 03:56:36,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2019-11-24 03:56:36,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2019-11-24 03:56:36,662 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2019-11-24 03:56:36,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 03:56:36,662 INFO L462 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2019-11-24 03:56:36,662 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-24 03:56:36,663 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2019-11-24 03:56:36,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-24 03:56:36,664 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 03:56:36,664 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-24 03:56:36,665 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 03:56:36,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 03:56:36,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1586973174, now seen corresponding path program 1 times [2019-11-24 03:56:36,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 03:56:36,666 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288315326] [2019-11-24 03:56:36,666 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 03:56:36,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 03:56:37,321 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 03:56:37,321 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288315326] [2019-11-24 03:56:37,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 03:56:37,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-24 03:56:37,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712699570] [2019-11-24 03:56:37,325 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-24 03:56:37,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 03:56:37,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-24 03:56:37,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-24 03:56:37,328 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 5 states. [2019-11-24 03:56:37,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 03:56:37,427 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-11-24 03:56:37,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-24 03:56:37,428 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2019-11-24 03:56:37,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 03:56:37,428 INFO L225 Difference]: With dead ends: 14 [2019-11-24 03:56:37,428 INFO L226 Difference]: Without dead ends: 10 [2019-11-24 03:56:37,429 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-24 03:56:37,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2019-11-24 03:56:37,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2019-11-24 03:56:37,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2019-11-24 03:56:37,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2019-11-24 03:56:37,434 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2019-11-24 03:56:37,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 03:56:37,434 INFO L462 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2019-11-24 03:56:37,434 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-24 03:56:37,435 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2019-11-24 03:56:37,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-24 03:56:37,436 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 03:56:37,436 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2019-11-24 03:56:37,436 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 03:56:37,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 03:56:37,438 INFO L82 PathProgramCache]: Analyzing trace with hash -337673499, now seen corresponding path program 1 times [2019-11-24 03:56:37,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 03:56:37,439 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593278965] [2019-11-24 03:56:37,439 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 03:56:37,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 03:56:37,876 WARN L192 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 16 [2019-11-24 03:56:38,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 03:56:38,010 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593278965] [2019-11-24 03:56:38,011 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314014676] [2019-11-24 03:56:38,011 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 03:56:38,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 03:56:38,096 INFO L255 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-24 03:56:38,105 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 03:56:38,193 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2019-11-24 03:56:38,194 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 03:56:38,210 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 03:56:38,211 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-24 03:56:38,211 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:61, output treesize:57 [2019-11-24 03:56:42,350 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-24 03:56:42,353 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 03:56:42,354 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 22 [2019-11-24 03:56:42,354 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-24 03:56:42,364 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-24 03:56:42,365 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2019-11-24 03:56:42,366 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:64, output treesize:32 [2019-11-24 03:56:42,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 03:56:42,391 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 03:56:42,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 03:56:42,431 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758367977] [2019-11-24 03:56:42,456 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2019-11-24 03:56:42,457 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 03:56:42,463 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 03:56:42,476 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 03:56:42,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 03:56:43,136 WARN L192 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2019-11-24 03:57:03,079 WARN L192 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2019-11-24 03:57:03,122 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:03,139 WARN L213 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:03,154 WARN L213 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:07,603 WARN L192 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 115 [2019-11-24 03:57:07,630 WARN L213 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:07,652 WARN L227 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:07,665 WARN L213 Elim1Store]: Array PQE input equivalent to false [2019-11-24 03:57:07,959 WARN L192 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 335 [2019-11-24 03:57:07,964 WARN L138 XnfTransformerHelper]: expecting exponential blowup for input size 20 [2019-11-24 03:57:11,945 WARN L177 XnfTransformerHelper]: Simplifying disjunction of 59049 conjuctions. This might take some time...