/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/array-examples/standard_two_index_02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 23:15:39,462 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 23:15:39,465 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 23:15:39,476 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 23:15:39,477 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 23:15:39,478 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 23:15:39,481 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 23:15:39,483 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 23:15:39,485 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 23:15:39,486 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 23:15:39,487 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 23:15:39,488 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 23:15:39,488 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 23:15:39,489 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 23:15:39,490 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 23:15:39,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 23:15:39,491 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 23:15:39,492 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 23:15:39,494 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 23:15:39,497 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 23:15:39,499 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 23:15:39,500 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 23:15:39,501 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 23:15:39,502 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 23:15:39,506 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 23:15:39,519 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 23:15:39,519 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 23:15:39,520 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 23:15:39,521 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 [2019-11-23 23:15:39,535 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 23:15:39,535 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 23:15:39,536 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-23 23:15:39,536 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-23 23:15:39,536 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-23 23:15:39,536 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-23 23:15:39,537 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-23 23:15:39,538 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-23 23:15:39,538 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-23 23:15:39,538 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-23 23:15:39,539 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 23:15:39,539 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 23:15:39,539 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 23:15:39,539 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 23:15:39,539 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 23:15:39,540 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 23:15:39,540 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 23:15:39,540 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 23:15:39,540 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 23:15:39,540 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 23:15:39,541 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 23:15:39,541 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 23:15:39,541 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 23:15:39,541 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 23:15:39,541 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 23:15:39,542 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 23:15:39,542 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 23:15:39,542 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 23:15:39,542 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-23 23:15:39,542 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 23:15:39,542 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 23:15:39,543 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 23:15:39,543 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-11-23 23:15:39,819 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 23:15:39,837 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 23:15:39,840 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 23:15:39,842 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 23:15:39,842 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 23:15:39,843 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_02.i [2019-11-23 23:15:39,912 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5b9a3a7b/00e75b6cd47947c398bafaa5f1be5d74/FLAG18888cc26 [2019-11-23 23:15:40,375 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 23:15:40,376 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_two_index_02.i [2019-11-23 23:15:40,380 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5b9a3a7b/00e75b6cd47947c398bafaa5f1be5d74/FLAG18888cc26 [2019-11-23 23:15:40,735 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5b9a3a7b/00e75b6cd47947c398bafaa5f1be5d74 [2019-11-23 23:15:40,745 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 23:15:40,748 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 23:15:40,750 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 23:15:40,750 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 23:15:40,754 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 23:15:40,755 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:40,758 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@405c04f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40, skipping insertion in model container [2019-11-23 23:15:40,758 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:40,767 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 23:15:40,782 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 23:15:40,950 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:15:40,954 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 23:15:40,981 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 23:15:40,997 INFO L208 MainTranslator]: Completed translation [2019-11-23 23:15:40,998 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40 WrapperNode [2019-11-23 23:15:40,998 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 23:15:40,999 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 23:15:40,999 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 23:15:40,999 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 23:15:41,008 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,089 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,110 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 23:15:41,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 23:15:41,110 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 23:15:41,111 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 23:15:41,120 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,120 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,122 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,127 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,132 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,134 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (1/1) ... [2019-11-23 23:15:41,136 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 23:15:41,136 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 23:15:41,136 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 23:15:41,136 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 23:15:41,137 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (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 [2019-11-23 23:15:41,205 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 23:15:41,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 23:15:41,207 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 23:15:41,207 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 23:15:41,208 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 23:15:41,208 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 23:15:41,563 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 23:15:41,563 INFO L284 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-23 23:15:41,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:15:41 BoogieIcfgContainer [2019-11-23 23:15:41,564 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 23:15:41,565 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 23:15:41,565 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 23:15:41,568 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 23:15:41,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 11:15:40" (1/3) ... [2019-11-23 23:15:41,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e7f0fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:15:41, skipping insertion in model container [2019-11-23 23:15:41,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 11:15:40" (2/3) ... [2019-11-23 23:15:41,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e7f0fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 11:15:41, skipping insertion in model container [2019-11-23 23:15:41,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 11:15:41" (3/3) ... [2019-11-23 23:15:41,572 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_02.i [2019-11-23 23:15:41,580 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 23:15:41,586 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 23:15:41,596 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 23:15:41,617 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 23:15:41,617 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 23:15:41,617 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 23:15:41,617 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 23:15:41,617 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 23:15:41,617 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 23:15:41,617 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 23:15:41,618 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 23:15:41,628 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states. [2019-11-23 23:15:41,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-23 23:15:41,634 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:15:41,635 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-23 23:15:41,635 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:15:41,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:15:41,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1774611857, now seen corresponding path program 1 times [2019-11-23 23:15:41,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:15:41,648 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613157664] [2019-11-23 23:15:41,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:15:41,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:15:41,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:15:41,802 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613157664] [2019-11-23 23:15:41,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 23:15:41,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 23:15:41,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506822609] [2019-11-23 23:15:41,811 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 23:15:41,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:15:41,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 23:15:41,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 23:15:41,828 INFO L87 Difference]: Start difference. First operand 9 states. Second operand 3 states. [2019-11-23 23:15:41,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:15:41,885 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2019-11-23 23:15:41,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 23:15:41,887 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-11-23 23:15:41,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:15:41,899 INFO L225 Difference]: With dead ends: 17 [2019-11-23 23:15:41,900 INFO L226 Difference]: Without dead ends: 9 [2019-11-23 23:15:41,904 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 [2019-11-23 23:15:41,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2019-11-23 23:15:41,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2019-11-23 23:15:41,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-11-23 23:15:41,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2019-11-23 23:15:41,945 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2019-11-23 23:15:41,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:15:41,946 INFO L462 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2019-11-23 23:15:41,946 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 23:15:41,947 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2019-11-23 23:15:41,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-23 23:15:41,947 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:15:41,948 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-23 23:15:41,948 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:15:41,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:15:41,949 INFO L82 PathProgramCache]: Analyzing trace with hash -610925648, now seen corresponding path program 1 times [2019-11-23 23:15:41,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:15:41,950 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196817156] [2019-11-23 23:15:41,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:15:41,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:15:42,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 23:15:42,054 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196817156] [2019-11-23 23:15:42,055 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708396258] [2019-11-23 23:15:42,056 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 [2019-11-23 23:15:42,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:15:42,133 INFO L255 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 23:15:42,139 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:15:42,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:15:42,161 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:15:42,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 23:15:42,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-23 23:15:42,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 5 [2019-11-23 23:15:42,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184558721] [2019-11-23 23:15:42,185 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 23:15:42,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-23 23:15:42,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 23:15:42,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 23:15:42,186 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand 4 states. [2019-11-23 23:15:42,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 23:15:42,238 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2019-11-23 23:15:42,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 23:15:42,239 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2019-11-23 23:15:42,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 23:15:42,240 INFO L225 Difference]: With dead ends: 24 [2019-11-23 23:15:42,240 INFO L226 Difference]: Without dead ends: 18 [2019-11-23 23:15:42,241 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 23:15:42,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-23 23:15:42,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2019-11-23 23:15:42,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-23 23:15:42,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2019-11-23 23:15:42,246 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2019-11-23 23:15:42,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 23:15:42,247 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2019-11-23 23:15:42,247 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 23:15:42,247 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2019-11-23 23:15:42,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-23 23:15:42,248 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 23:15:42,248 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2019-11-23 23:15:42,452 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 23:15:42,453 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 23:15:42,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 23:15:42,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1417050161, now seen corresponding path program 1 times [2019-11-23 23:15:42,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-23 23:15:42,455 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416437362] [2019-11-23 23:15:42,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 23:15:42,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:15:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 23:15:42,549 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416437362] [2019-11-23 23:15:42,550 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115372070] [2019-11-23 23:15:42,550 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 [2019-11-23 23:15:42,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 23:15:42,612 INFO L255 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 23:15:42,613 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 23:15:42,622 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 23:15:42,624 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-23 23:15:42,670 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-23 23:15:42,670 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [934416552] [2019-11-23 23:15:42,720 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2019-11-23 23:15:42,720 INFO L166 IcfgInterpreter]: Building call graph [2019-11-23 23:15:42,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-23 23:15:42,743 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-23 23:15:42,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-23 23:15:46,619 WARN L192 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2019-11-23 23:15:54,634 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2019-11-23 23:15:54,810 WARN L192 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 193 [2019-11-23 23:15:56,067 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2019-11-23 23:16:17,980 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 278 DAG size of output: 275 [2019-11-23 23:16:21,925 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 287 [2019-11-23 23:16:22,037 WARN L192 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 288 DAG size of output: 283 [2019-11-23 23:16:24,012 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 285 [2019-11-23 23:16:26,225 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 290 [2019-11-23 23:16:26,343 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 291 DAG size of output: 287 [2019-11-23 23:16:28,731 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 299 DAG size of output: 296 [2019-11-23 23:16:28,847 WARN L192 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 292 [2019-11-23 23:16:31,041 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 296 DAG size of output: 294 [2019-11-23 23:16:31,277 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 297 DAG size of output: 297 [2019-11-23 23:16:35,690 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 306 [2019-11-23 23:16:35,803 WARN L192 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 307 DAG size of output: 306 [2019-11-23 23:16:38,082 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 309 [2019-11-23 23:16:38,197 WARN L192 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 310 DAG size of output: 309 [2019-11-23 23:16:40,366 WARN L192 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 319 DAG size of output: 317 [2019-11-23 23:16:40,504 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 318 DAG size of output: 310 [2019-11-23 23:16:40,722 WARN L192 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 312 [2019-11-23 23:16:43,104 WARN L192 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 316 [2019-11-23 23:16:43,228 WARN L192 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 317 DAG size of output: 315 [2019-11-23 23:16:43,372 WARN L192 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 317 [2019-11-23 23:16:43,495 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 318 DAG size of output: 317 [2019-11-23 23:16:43,727 WARN L192 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 321 DAG size of output: 320 [2019-11-23 23:16:43,869 WARN L192 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 323 [2019-11-23 23:16:43,981 WARN L192 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 324 DAG size of output: 324 [2019-11-23 23:16:46,567 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 328 [2019-11-23 23:16:46,696 WARN L192 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 329 DAG size of output: 328 [2019-11-23 23:16:49,093 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 331 [2019-11-23 23:16:49,231 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 332 DAG size of output: 330 [2019-11-23 23:16:49,388 WARN L192 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 332 [2019-11-23 23:16:49,514 WARN L192 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 333 DAG size of output: 333 [2019-11-23 23:16:51,992 WARN L192 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 337 [2019-11-23 23:16:52,120 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 338 DAG size of output: 338 [2019-11-23 23:16:54,673 WARN L192 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 349 DAG size of output: 345 [2019-11-23 23:16:54,825 WARN L192 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 346 DAG size of output: 340 [2019-11-23 23:16:54,968 WARN L192 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 341 [2019-11-23 23:16:55,098 WARN L192 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 342 DAG size of output: 342 [2019-11-23 23:16:57,889 WARN L192 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 346 [2019-11-23 23:16:58,034 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 346 [2019-11-23 23:17:01,250 WARN L192 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 349 [2019-11-23 23:17:01,383 WARN L192 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 350 DAG size of output: 350 [2019-11-23 23:17:04,124 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 354 [2019-11-23 23:17:04,270 WARN L192 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 355 DAG size of output: 354 [2019-11-23 23:17:07,577 WARN L192 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 363 DAG size of output: 360 [2019-11-23 23:17:07,729 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 361 DAG size of output: 357 [2019-11-23 23:17:10,545 WARN L192 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 360 [2019-11-23 23:17:10,696 WARN L192 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 361 DAG size of output: 361