/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 00:33:00,725 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 00:33:00,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 00:33:00,740 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-07 00:33:00,749 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 00:33:00,750 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 00:33:00,751 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 00:33:00,752 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 00:33:00,753 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 00:33:00,754 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 00:33:00,756 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 00:33:00,758 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 00:33:00,760 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 00:33:00,761 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 00:33:00,762 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 00:33:00,763 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 00:33:00,765 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 00:33:00,772 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 00:33:00,773 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 00:33:00,774 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 00:33:00,775 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 00:33:00,794 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 00:33:00,794 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 00:33:00,796 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 00:33:00,796 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 00:33:00,796 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 00:33:00,796 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 00:33:00,796 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 00:33:00,797 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 00:33:00,797 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 00:33:00,797 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 00:33:00,797 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 00:33:00,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 00:33:00,798 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 00:33:00,798 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 00:33:00,798 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 00:33:00,798 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 00:33:00,799 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 00:33:00,800 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 00:33:00,800 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 00:33:00,800 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 00:33:00,800 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 00:33:00,801 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 00:33:00,801 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 00:33:00,801 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 00:33:00,802 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 00:33:00,802 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 00:33:00,802 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 00:33:00,802 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 00:33:00,802 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-11-07 00:33:01,078 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 00:33:01,088 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 00:33:01,094 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 00:33:01,095 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 00:33:01,095 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 00:33:01,096 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2019-11-07 00:33:01,162 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2dbc51ed7/d20600bcb6fc44449711a6a51b6ea1c3/FLAG00061edb6 [2019-11-07 00:33:01,625 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 00:33:01,626 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_2-2.c [2019-11-07 00:33:01,633 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2dbc51ed7/d20600bcb6fc44449711a6a51b6ea1c3/FLAG00061edb6 [2019-11-07 00:33:02,006 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2dbc51ed7/d20600bcb6fc44449711a6a51b6ea1c3 [2019-11-07 00:33:02,017 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 00:33:02,018 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 00:33:02,019 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 00:33:02,019 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 00:33:02,023 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 00:33:02,024 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,027 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ba9d4c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02, skipping insertion in model container [2019-11-07 00:33:02,028 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,036 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 00:33:02,058 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 00:33:02,239 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:33:02,245 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 00:33:02,268 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 00:33:02,282 INFO L192 MainTranslator]: Completed translation [2019-11-07 00:33:02,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02 WrapperNode [2019-11-07 00:33:02,283 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 00:33:02,284 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 00:33:02,284 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 00:33:02,284 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 00:33:02,377 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,391 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,397 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,403 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,404 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (1/1) ... [2019-11-07 00:33:02,408 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 00:33:02,408 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 00:33:02,408 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 00:33:02,409 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 00:33:02,409 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (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 [2019-11-07 00:33:02,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 00:33:02,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 00:33:02,467 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 00:33:02,468 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 00:33:02,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 00:33:02,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-11-07 00:33:02,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 00:33:02,468 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 00:33:02,468 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 00:33:02,469 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 00:33:02,741 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 00:33:02,742 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 00:33:02,744 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:33:02 BoogieIcfgContainer [2019-11-07 00:33:02,745 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 00:33:02,746 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 00:33:02,747 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 00:33:02,752 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 00:33:02,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:33:02" (1/3) ... [2019-11-07 00:33:02,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae5e266 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:33:02, skipping insertion in model container [2019-11-07 00:33:02,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:33:02" (2/3) ... [2019-11-07 00:33:02,754 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae5e266 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:33:02, skipping insertion in model container [2019-11-07 00:33:02,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:33:02" (3/3) ... [2019-11-07 00:33:02,757 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-2.c [2019-11-07 00:33:02,772 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 00:33:02,799 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 00:33:02,815 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 00:33:02,866 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 00:33:02,866 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 00:33:02,866 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 00:33:02,866 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 00:33:02,867 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 00:33:02,867 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 00:33:02,867 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 00:33:02,867 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 00:33:02,884 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-07 00:33:02,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:33:02,890 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:02,891 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:02,892 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:02,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:02,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2019-11-07 00:33:02,904 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:02,905 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692844996] [2019-11-07 00:33:02,905 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:02,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:02,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:02,991 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692844996] [2019-11-07 00:33:02,992 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:33:02,992 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-07 00:33:02,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950652820] [2019-11-07 00:33:02,998 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-07 00:33:02,999 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:03,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-07 00:33:03,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-07 00:33:03,015 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2019-11-07 00:33:03,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:03,046 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2019-11-07 00:33:03,046 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-07 00:33:03,047 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-07 00:33:03,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:03,059 INFO L225 Difference]: With dead ends: 38 [2019-11-07 00:33:03,059 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 00:33:03,066 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 [2019-11-07 00:33:03,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 00:33:03,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 00:33:03,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 00:33:03,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2019-11-07 00:33:03,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2019-11-07 00:33:03,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:03,130 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2019-11-07 00:33:03,130 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-07 00:33:03,131 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2019-11-07 00:33:03,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 00:33:03,133 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:03,133 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:03,134 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:03,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:03,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2019-11-07 00:33:03,137 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:03,137 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325560111] [2019-11-07 00:33:03,138 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:03,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:03,372 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325560111] [2019-11-07 00:33:03,373 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:33:03,373 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 00:33:03,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581711104] [2019-11-07 00:33:03,376 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 00:33:03,377 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:03,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 00:33:03,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:03,379 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2019-11-07 00:33:03,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:03,486 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2019-11-07 00:33:03,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 00:33:03,487 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-07 00:33:03,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:03,490 INFO L225 Difference]: With dead ends: 28 [2019-11-07 00:33:03,490 INFO L226 Difference]: Without dead ends: 23 [2019-11-07 00:33:03,491 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:03,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-07 00:33:03,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-11-07 00:33:03,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 00:33:03,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2019-11-07 00:33:03,498 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2019-11-07 00:33:03,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:03,499 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2019-11-07 00:33:03,499 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 00:33:03,499 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2019-11-07 00:33:03,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 00:33:03,500 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:03,501 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:03,501 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:03,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:03,502 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2019-11-07 00:33:03,502 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:03,502 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882044166] [2019-11-07 00:33:03,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:03,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:03,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:03,639 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882044166] [2019-11-07 00:33:03,640 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:33:03,640 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 00:33:03,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833821021] [2019-11-07 00:33:03,641 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 00:33:03,641 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:03,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 00:33:03,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:03,642 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2019-11-07 00:33:03,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:03,787 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2019-11-07 00:33:03,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 00:33:03,788 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-11-07 00:33:03,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:03,790 INFO L225 Difference]: With dead ends: 50 [2019-11-07 00:33:03,790 INFO L226 Difference]: Without dead ends: 34 [2019-11-07 00:33:03,791 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:03,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-07 00:33:03,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2019-11-07 00:33:03,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 00:33:03,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2019-11-07 00:33:03,801 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2019-11-07 00:33:03,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:03,801 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2019-11-07 00:33:03,801 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 00:33:03,801 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2019-11-07 00:33:03,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 00:33:03,802 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:03,803 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:03,803 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:03,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:03,803 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2019-11-07 00:33:03,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:03,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412616008] [2019-11-07 00:33:03,804 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:03,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:04,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:04,142 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412616008] [2019-11-07 00:33:04,142 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428823919] [2019-11-07 00:33:04,143 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 [2019-11-07 00:33:04,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:04,198 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-07 00:33:04,205 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 00:33:04,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:04,263 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 00:33:05,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:05,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [702566107] [2019-11-07 00:33:05,826 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 22 [2019-11-07 00:33:05,870 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-07 00:33:05,870 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-07 00:33:05,939 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-11-07 00:33:06,568 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-11-07 00:33:06,572 INFO L272 AbstractInterpreter]: Visited 21 different actions 101 times. Merged at 12 different actions 60 times. Widened at 1 different actions 3 times. Performed 227 root evaluator evaluations with a maximum evaluation depth of 13. Performed 227 inverse root evaluator evaluations with a maximum inverse evaluation depth of 13. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-11-07 00:33:06,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:06,580 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 00:33:06,580 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 00:33:06,580 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2019-11-07 00:33:06,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477708752] [2019-11-07 00:33:06,582 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-07 00:33:06,583 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:06,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-07 00:33:06,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=410, Unknown=0, NotChecked=0, Total=600 [2019-11-07 00:33:06,586 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 25 states. [2019-11-07 00:33:07,397 WARN L191 SmtUtils]: Spent 550.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 10 [2019-11-07 00:33:10,249 WARN L191 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 12 [2019-11-07 00:33:12,563 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 10 [2019-11-07 00:33:16,332 WARN L191 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 10 [2019-11-07 00:33:18,014 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 10 [2019-11-07 00:33:18,893 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2019-11-07 00:33:21,357 WARN L191 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 10 [2019-11-07 00:33:21,887 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 12 [2019-11-07 00:33:23,607 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 10 [2019-11-07 00:33:29,147 WARN L191 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2019-11-07 00:33:36,349 WARN L191 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2019-11-07 00:33:47,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:47,271 INFO L93 Difference]: Finished difference Result 128 states and 148 transitions. [2019-11-07 00:33:47,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-07 00:33:47,272 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 21 [2019-11-07 00:33:47,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:47,276 INFO L225 Difference]: With dead ends: 128 [2019-11-07 00:33:47,276 INFO L226 Difference]: Without dead ends: 123 [2019-11-07 00:33:47,277 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=593, Invalid=1045, Unknown=2, NotChecked=0, Total=1640 [2019-11-07 00:33:47,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-11-07 00:33:47,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 55. [2019-11-07 00:33:47,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-07 00:33:47,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2019-11-07 00:33:47,293 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 21 [2019-11-07 00:33:47,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:47,294 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2019-11-07 00:33:47,294 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-07 00:33:47,294 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2019-11-07 00:33:47,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 00:33:47,295 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:47,295 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:47,497 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 00:33:47,498 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:47,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:47,499 INFO L82 PathProgramCache]: Analyzing trace with hash -402778255, now seen corresponding path program 1 times [2019-11-07 00:33:47,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:47,499 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645225677] [2019-11-07 00:33:47,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:47,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:47,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 00:33:47,616 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645225677] [2019-11-07 00:33:47,617 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 00:33:47,617 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 00:33:47,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037875087] [2019-11-07 00:33:47,618 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 00:33:47,618 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-07 00:33:47,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 00:33:47,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:47,618 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand 3 states. [2019-11-07 00:33:47,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 00:33:47,702 INFO L93 Difference]: Finished difference Result 82 states and 94 transitions. [2019-11-07 00:33:47,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 00:33:47,704 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-11-07 00:33:47,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 00:33:47,705 INFO L225 Difference]: With dead ends: 82 [2019-11-07 00:33:47,705 INFO L226 Difference]: Without dead ends: 56 [2019-11-07 00:33:47,706 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 00:33:47,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-07 00:33:47,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2019-11-07 00:33:47,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-07 00:33:47,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2019-11-07 00:33:47,718 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2019-11-07 00:33:47,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 00:33:47,718 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2019-11-07 00:33:47,719 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 00:33:47,719 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2019-11-07 00:33:47,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 00:33:47,720 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 00:33:47,720 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 00:33:47,720 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 00:33:47,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 00:33:47,721 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2019-11-07 00:33:47,721 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-07 00:33:47,722 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535526897] [2019-11-07 00:33:47,722 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 00:33:47,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 00:33:50,090 WARN L191 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 40 DAG size of output: 18 [2019-11-07 00:33:52,116 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse8 (div c_main_~y~0 2))) (let ((.cse18 (* 2 .cse8))) (let ((.cse15 (* 4294967296 (div c_main_~y~0 4294967296))) (.cse13 (= c_main_~y~0 .cse18)) (.cse19 (* .cse8 (- 2)))) (let ((.cse17 (div (+ .cse19 c_main_~y~0) 4294967296)) (.cse1 (not .cse13)) (.cse2 (< c_main_~y~0 .cse15)) (.cse16 (div (+ .cse19 c_main_~y~0 (- 2)) 4294967296))) (let ((.cse0 (+ .cse18 (* 4294967296 .cse16) 2)) (.cse14 (<= .cse15 c_main_~y~0)) (.cse12 (and .cse1 .cse2)) (.cse11 (+ .cse18 (* 4294967296 .cse17)))) (let ((.cse4 (or .cse12 (< .cse11 c_main_~y~0))) (.cse10 (+ .cse17 1)) (.cse3 (+ .cse16 1)) (.cse7 (or .cse13 .cse14)) (.cse9 (or (< .cse0 c_main_~y~0) .cse13 .cse14))) (and (or (and (<= c_main_~y~0 .cse0) .cse1 .cse2) (and .cse1 .cse2 (<= .cse3 0)) (and .cse4 (let ((.cse5 (* 2 c_main_~y~0)) (.cse6 (* 4 .cse8))) (or (and .cse1 .cse2 (<= (+ .cse5 (* 2 (div (+ c_main_~x~0 2) 2))) (+ .cse6 c_main_~x~0 5))) (and (<= (+ .cse5 (* 2 (div c_main_~x~0 2))) (+ .cse6 c_main_~x~0 1)) .cse7))) .cse9) (and (<= .cse10 0) .cse7) (and (<= c_main_~y~0 .cse11) .cse7)) (or .cse12 (not (= .cse11 c_main_~y~0))) .cse4 (or (not (= c_main_~y~0 .cse0)) .cse13 .cse14) (< .cse15 (+ c_main_~y~0 1)) (or .cse12 .cse13 .cse14) (or (and (<= 0 .cse16) .cse1 .cse2) (and (or .cse12 (< 0 .cse10)) (or (< 0 .cse3) .cse13 .cse14)) (and (<= 0 .cse17) .cse7)) .cse9))))))) is different from false