/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/loops/ludcmp.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-24 04:26:33,553 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-24 04:26:33,557 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-24 04:26:33,568 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-24 04:26:33,568 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-24 04:26:33,569 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-24 04:26:33,571 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-24 04:26:33,572 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-24 04:26:33,574 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-24 04:26:33,575 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-24 04:26:33,576 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-24 04:26:33,577 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-24 04:26:33,577 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-24 04:26:33,578 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-24 04:26:33,579 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-24 04:26:33,580 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-24 04:26:33,581 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-24 04:26:33,582 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-24 04:26:33,583 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-24 04:26:33,585 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-24 04:26:33,587 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-24 04:26:33,588 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-24 04:26:33,589 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-24 04:26:33,590 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-24 04:26:33,592 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-24 04:26:33,600 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-24 04:26:33,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-24 04:26:33,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-24 04:26:33,602 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 04:26:33,628 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-24 04:26:33,628 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-24 04:26:33,629 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-24 04:26:33,629 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-24 04:26:33,629 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-24 04:26:33,629 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-24 04:26:33,630 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-24 04:26:33,630 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-24 04:26:33,630 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-24 04:26:33,631 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-24 04:26:33,631 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-24 04:26:33,631 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-24 04:26:33,631 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-24 04:26:33,631 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-24 04:26:33,632 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-24 04:26:33,632 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-24 04:26:33,632 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-24 04:26:33,633 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-24 04:26:33,634 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-24 04:26:33,634 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-24 04:26:33,635 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-24 04:26:33,635 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-24 04:26:33,635 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-24 04:26:33,635 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-24 04:26:33,636 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-24 04:26:33,636 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-24 04:26:33,636 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-24 04:26:33,636 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-24 04:26:33,637 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-24 04:26:33,638 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-24 04:26:33,638 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-24 04:26:33,638 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-24 04:26:33,638 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-24 04:26:33,638 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-24 04:26:33,639 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-24 04:26:33,639 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-24 04:26:33,639 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-24 04:26:33,640 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-24 04:26:33,916 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-24 04:26:33,934 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-24 04:26:33,939 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-24 04:26:33,940 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-24 04:26:33,941 INFO L275 PluginConnector]: CDTParser initialized [2019-11-24 04:26:33,942 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/ludcmp.c [2019-11-24 04:26:34,011 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/91c4ffd4a/054dedf7b5ae4db398b0112f92e453d8/FLAGdae67b62e [2019-11-24 04:26:34,467 INFO L306 CDTParser]: Found 1 translation units. [2019-11-24 04:26:34,468 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/ludcmp.c [2019-11-24 04:26:34,477 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/91c4ffd4a/054dedf7b5ae4db398b0112f92e453d8/FLAGdae67b62e [2019-11-24 04:26:34,827 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/91c4ffd4a/054dedf7b5ae4db398b0112f92e453d8 [2019-11-24 04:26:34,835 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-24 04:26:34,837 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-24 04:26:34,838 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-24 04:26:34,838 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-24 04:26:34,842 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-24 04:26:34,843 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:26:34" (1/1) ... [2019-11-24 04:26:34,846 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e3f320d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:34, skipping insertion in model container [2019-11-24 04:26:34,846 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 04:26:34" (1/1) ... [2019-11-24 04:26:34,854 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-24 04:26:34,876 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-24 04:26:35,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:26:35,197 INFO L203 MainTranslator]: Completed pre-run [2019-11-24 04:26:35,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-24 04:26:35,500 INFO L208 MainTranslator]: Completed translation [2019-11-24 04:26:35,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35 WrapperNode [2019-11-24 04:26:35,501 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-24 04:26:35,502 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-24 04:26:35,502 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-24 04:26:35,502 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-24 04:26:35,511 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,561 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,701 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-24 04:26:35,701 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-24 04:26:35,701 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-24 04:26:35,701 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-24 04:26:35,712 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,712 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,752 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,755 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,842 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,868 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,887 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (1/1) ... [2019-11-24 04:26:35,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-24 04:26:35,908 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-24 04:26:35,908 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-24 04:26:35,908 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-24 04:26:35,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (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 04:26:35,980 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2019-11-24 04:26:35,983 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2019-11-24 04:26:35,983 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-24 04:26:35,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-24 04:26:35,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~real [2019-11-24 04:26:35,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-24 04:26:35,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-24 04:26:39,270 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-24 04:26:39,270 INFO L284 CfgBuilder]: Removed 21 assume(true) statements. [2019-11-24 04:26:39,272 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:26:39 BoogieIcfgContainer [2019-11-24 04:26:39,272 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-24 04:26:39,276 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-24 04:26:39,276 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-24 04:26:39,279 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-24 04:26:39,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 04:26:34" (1/3) ... [2019-11-24 04:26:39,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33a10879 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:26:39, skipping insertion in model container [2019-11-24 04:26:39,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 04:26:35" (2/3) ... [2019-11-24 04:26:39,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33a10879 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 04:26:39, skipping insertion in model container [2019-11-24 04:26:39,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 04:26:39" (3/3) ... [2019-11-24 04:26:39,284 INFO L109 eAbstractionObserver]: Analyzing ICFG ludcmp.c [2019-11-24 04:26:39,299 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-24 04:26:39,314 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-24 04:26:39,330 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-24 04:26:39,366 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-24 04:26:39,367 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-24 04:26:39,367 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-24 04:26:39,367 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-24 04:26:39,367 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-24 04:26:39,368 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-24 04:26:39,368 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-24 04:26:39,368 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-24 04:26:39,389 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-24 04:26:39,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-11-24 04:26:39,400 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:26:39,402 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-11-24 04:26:39,402 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:26:39,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:26:39,412 INFO L82 PathProgramCache]: Analyzing trace with hash 222157382, now seen corresponding path program 1 times [2019-11-24 04:26:39,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:26:39,427 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632313809] [2019-11-24 04:26:39,428 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:26:39,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:26:40,168 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 04:26:40,169 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632313809] [2019-11-24 04:26:40,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-24 04:26:40,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-24 04:26:40,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588376184] [2019-11-24 04:26:40,175 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-24 04:26:40,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-24 04:26:40,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-24 04:26:40,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 04:26:40,193 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-11-24 04:26:40,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-24 04:26:40,468 INFO L93 Difference]: Finished difference Result 44 states and 73 transitions. [2019-11-24 04:26:40,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-24 04:26:40,470 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2019-11-24 04:26:40,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-24 04:26:40,480 INFO L225 Difference]: With dead ends: 44 [2019-11-24 04:26:40,480 INFO L226 Difference]: Without dead ends: 8 [2019-11-24 04:26:40,484 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-24 04:26:40,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2019-11-24 04:26:40,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2019-11-24 04:26:40,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2019-11-24 04:26:40,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2019-11-24 04:26:40,517 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2019-11-24 04:26:40,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-24 04:26:40,517 INFO L462 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2019-11-24 04:26:40,517 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-24 04:26:40,518 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2019-11-24 04:26:40,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-24 04:26:40,518 INFO L402 BasicCegarLoop]: Found error trace [2019-11-24 04:26:40,518 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-24 04:26:40,519 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-24 04:26:40,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-24 04:26:40,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1702487825, now seen corresponding path program 1 times [2019-11-24 04:26:40,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-24 04:26:40,520 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505425321] [2019-11-24 04:26:40,520 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-24 04:26:40,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:26:40,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:26:40,836 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505425321] [2019-11-24 04:26:40,836 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601045450] [2019-11-24 04:26:40,837 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 04:26:41,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-24 04:26:41,869 INFO L255 TraceCheckSpWp]: Trace formula consists of 5252 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-24 04:26:41,878 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-24 04:26:41,925 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:26:41,926 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-24 04:26:41,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-24 04:26:41,955 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504559019] [2019-11-24 04:26:41,981 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2019-11-24 04:26:41,981 INFO L166 IcfgInterpreter]: Building call graph [2019-11-24 04:26:41,987 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-24 04:26:41,994 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-24 04:26:41,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-24 04:26:53,255 WARN L192 SmtUtils]: Spent 10.19 s on a formula simplification that was a NOOP. DAG size: 10360 [2019-11-24 04:27:04,240 WARN L192 SmtUtils]: Spent 9.48 s on a formula simplification that was a NOOP. DAG size: 10358