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/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf -i ../../../trunk/examples/svcomp/nla-digbench/cohencu.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-0883e75 [2019-09-05 13:14:58,893 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-05 13:14:58,896 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-05 13:14:58,912 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-05 13:14:58,921 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-05 13:14:58,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-05 13:14:58,922 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-05 13:14:58,924 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-05 13:14:58,924 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-05 13:14:58,925 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-05 13:14:58,927 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-05 13:14:58,929 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-05 13:14:58,930 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-05 13:14:58,931 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-05 13:14:58,932 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-05 13:14:58,933 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-05 13:14:58,935 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-05 13:14:58,938 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-05 13:14:58,939 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-05 13:14:58,939 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-05 13:14:58,940 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-05 13:14:58,941 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-05 13:14:58,941 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-05 13:14:58,942 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-05 13:14:58,942 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... 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[2019-09-05 13:14:58,944 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/svcomp-Reach-32bit-Automizer_Default+AIv2_INT.epf [2019-09-05 13:14:58,961 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-05 13:14:58,961 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-05 13:14:58,961 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-05 13:14:58,962 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-05 13:14:58,962 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-05 13:14:58,963 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-05 13:14:58,963 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-05 13:14:58,963 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-05 13:14:58,963 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-05 13:14:58,963 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-05 13:14:58,964 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-05 13:14:58,964 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-05 13:14:58,964 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-05 13:14:58,964 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-05 13:14:58,965 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-05 13:14:58,965 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-05 13:14:58,965 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-05 13:14:58,965 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-05 13:14:58,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-05 13:14:58,966 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-05 13:14:58,966 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-05 13:14:58,966 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-05 13:14:58,966 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-05 13:14:58,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-05 13:14:58,967 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-05 13:14:58,967 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-05 13:14:58,967 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-05 13:14:58,967 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-05 13:14:58,967 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-05 13:14:58,967 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-05 13:14:58,996 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-05 13:14:59,008 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-05 13:14:59,011 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-05 13:14:59,012 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-05 13:14:59,013 INFO L275 PluginConnector]: CDTParser initialized [2019-09-05 13:14:59,013 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/cohencu.c [2019-09-05 13:14:59,082 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/403d2ff4e/643cfc257fd74ebdba748ce470bacbd0/FLAGfbadf4409 [2019-09-05 13:14:59,568 INFO L306 CDTParser]: Found 1 translation units. [2019-09-05 13:14:59,572 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/cohencu.c [2019-09-05 13:14:59,582 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/403d2ff4e/643cfc257fd74ebdba748ce470bacbd0/FLAGfbadf4409 [2019-09-05 13:14:59,961 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/403d2ff4e/643cfc257fd74ebdba748ce470bacbd0 [2019-09-05 13:14:59,971 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-05 13:14:59,972 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-05 13:14:59,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-05 13:14:59,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-05 13:14:59,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-05 13:14:59,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:14:59" (1/1) ... [2019-09-05 13:14:59,980 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fb73d51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:14:59, skipping insertion in model container [2019-09-05 13:14:59,981 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.09 01:14:59" (1/1) ... [2019-09-05 13:14:59,988 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-05 13:15:00,008 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-05 13:15:00,187 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:15:00,191 INFO L188 MainTranslator]: Completed pre-run [2019-09-05 13:15:00,213 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-05 13:15:00,315 INFO L192 MainTranslator]: Completed translation [2019-09-05 13:15:00,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00 WrapperNode [2019-09-05 13:15:00,316 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-05 13:15:00,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-05 13:15:00,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-05 13:15:00,317 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-05 13:15:00,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,337 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,337 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,341 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,346 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,347 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (1/1) ... [2019-09-05 13:15:00,348 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-05 13:15:00,349 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-05 13:15:00,349 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-05 13:15:00,349 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-05 13:15:00,350 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (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 [2019-09-05 13:15:00,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-05 13:15:00,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-05 13:15:00,403 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-05 13:15:00,403 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-05 13:15:00,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-05 13:15:00,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-05 13:15:00,582 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-05 13:15:00,582 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-05 13:15:00,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:15:00 BoogieIcfgContainer [2019-09-05 13:15:00,584 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-05 13:15:00,584 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-05 13:15:00,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-05 13:15:00,587 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-05 13:15:00,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.09 01:14:59" (1/3) ... [2019-09-05 13:15:00,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@430c5f5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:15:00, skipping insertion in model container [2019-09-05 13:15:00,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.09 01:15:00" (2/3) ... [2019-09-05 13:15:00,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@430c5f5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.09 01:15:00, skipping insertion in model container [2019-09-05 13:15:00,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.09 01:15:00" (3/3) ... [2019-09-05 13:15:00,591 INFO L109 eAbstractionObserver]: Analyzing ICFG cohencu.c [2019-09-05 13:15:00,600 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-05 13:15:00,607 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-05 13:15:00,623 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-05 13:15:00,649 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-05 13:15:00,649 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-05 13:15:00,649 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-05 13:15:00,649 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-05 13:15:00,649 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-05 13:15:00,650 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-05 13:15:00,650 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-05 13:15:00,650 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-05 13:15:00,665 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-09-05 13:15:00,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 13:15:00,674 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:00,675 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:00,677 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:00,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:00,683 INFO L82 PathProgramCache]: Analyzing trace with hash 2145967090, now seen corresponding path program 1 times [2019-09-05 13:15:00,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:00,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:00,722 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:00,722 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:00,722 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:00,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:00,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:00,779 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:15:00,780 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-05 13:15:00,780 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:15:00,784 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-05 13:15:00,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-05 13:15:00,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-05 13:15:00,798 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2019-09-05 13:15:00,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:00,814 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2019-09-05 13:15:00,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-05 13:15:00,815 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-05 13:15:00,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:00,823 INFO L225 Difference]: With dead ends: 29 [2019-09-05 13:15:00,823 INFO L226 Difference]: Without dead ends: 24 [2019-09-05 13:15:00,825 INFO L628 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 [2019-09-05 13:15:00,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-09-05 13:15:00,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-09-05 13:15:00,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-05 13:15:00,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2019-09-05 13:15:00,866 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 10 [2019-09-05 13:15:00,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:00,866 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2019-09-05 13:15:00,866 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-05 13:15:00,867 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2019-09-05 13:15:00,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-05 13:15:00,867 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:00,867 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:00,868 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:00,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:00,868 INFO L82 PathProgramCache]: Analyzing trace with hash 2134586928, now seen corresponding path program 1 times [2019-09-05 13:15:00,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:00,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:00,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:00,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:00,870 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:00,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:01,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:01,019 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-05 13:15:01,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-05 13:15:01,020 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:15:01,021 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 13:15:01,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 13:15:01,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-05 13:15:01,022 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand 5 states. [2019-09-05 13:15:01,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:01,210 INFO L93 Difference]: Finished difference Result 28 states and 37 transitions. [2019-09-05 13:15:01,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:15:01,212 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-05 13:15:01,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:01,213 INFO L225 Difference]: With dead ends: 28 [2019-09-05 13:15:01,213 INFO L226 Difference]: Without dead ends: 28 [2019-09-05 13:15:01,214 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-09-05 13:15:01,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-09-05 13:15:01,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-09-05 13:15:01,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-09-05 13:15:01,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2019-09-05 13:15:01,231 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 10 [2019-09-05 13:15:01,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:01,232 INFO L475 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2019-09-05 13:15:01,233 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 13:15:01,233 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2019-09-05 13:15:01,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-05 13:15:01,234 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:01,234 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:01,235 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:01,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:01,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1496147284, now seen corresponding path program 1 times [2019-09-05 13:15:01,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:01,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:01,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:01,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:01,237 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:01,246 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:01,246 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:01,246 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG 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 [2019-09-05 13:15:01,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:01,263 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:15:01,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:01,279 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2019-09-05 13:15:01,281 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52] [2019-09-05 13:15:01,309 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:15:01,309 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:15:01,407 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:15:01,412 INFO L272 AbstractInterpreter]: Visited 14 different actions 19 times. Never merged. Never widened. Performed 18 root evaluator evaluations with a maximum evaluation depth of 8. Performed 18 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:15:01,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:01,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:15:01,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:01,417 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:01,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:01,432 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:15:01,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:01,452 INFO L256 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-05 13:15:01,457 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:01,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:01,562 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:01,632 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:01,659 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:01,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-05 13:15:01,706 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:15:01,706 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-09-05 13:15:01,706 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:01,707 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-05 13:15:01,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-05 13:15:01,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:15:01,708 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand 12 states. [2019-09-05 13:15:02,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:02,182 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2019-09-05 13:15:02,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-09-05 13:15:02,183 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2019-09-05 13:15:02,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:02,186 INFO L225 Difference]: With dead ends: 51 [2019-09-05 13:15:02,187 INFO L226 Difference]: Without dead ends: 51 [2019-09-05 13:15:02,187 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:15:02,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-09-05 13:15:02,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2019-09-05 13:15:02,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-09-05 13:15:02,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 66 transitions. [2019-09-05 13:15:02,208 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 66 transitions. Word has length 15 [2019-09-05 13:15:02,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:02,208 INFO L475 AbstractCegarLoop]: Abstraction has 48 states and 66 transitions. [2019-09-05 13:15:02,208 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-05 13:15:02,209 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 66 transitions. [2019-09-05 13:15:02,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-09-05 13:15:02,210 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:02,210 INFO L399 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:02,211 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:02,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:02,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1472996464, now seen corresponding path program 1 times [2019-09-05 13:15:02,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:02,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:02,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:02,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:02,214 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:02,226 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:02,226 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:02,227 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2019-09-05 13:15:02,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:02,272 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:15:02,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:02,283 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2019-09-05 13:15:02,284 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52], [53], [54] [2019-09-05 13:15:02,290 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:15:02,290 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:15:02,379 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:15:02,380 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:15:02,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:02,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:15:02,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:02,380 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:15:02,402 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:02,402 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:02,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:02,419 INFO L256 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-05 13:15:02,421 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:02,486 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 13:15:02,486 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:02,533 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:02,564 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:02,585 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-09-05 13:15:02,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:15:02,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-09-05 13:15:02,590 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:02,591 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-05 13:15:02,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-05 13:15:02,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:15:02,592 INFO L87 Difference]: Start difference. First operand 48 states and 66 transitions. Second operand 12 states. [2019-09-05 13:15:04,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:04,889 INFO L93 Difference]: Finished difference Result 53 states and 70 transitions. [2019-09-05 13:15:04,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 13:15:04,891 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2019-09-05 13:15:04,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:04,892 INFO L225 Difference]: With dead ends: 53 [2019-09-05 13:15:04,892 INFO L226 Difference]: Without dead ends: 53 [2019-09-05 13:15:04,893 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:15:04,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-09-05 13:15:04,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-09-05 13:15:04,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-09-05 13:15:04,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 69 transitions. [2019-09-05 13:15:04,902 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 69 transitions. Word has length 20 [2019-09-05 13:15:04,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:04,902 INFO L475 AbstractCegarLoop]: Abstraction has 52 states and 69 transitions. [2019-09-05 13:15:04,902 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-05 13:15:04,902 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 69 transitions. [2019-09-05 13:15:04,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-05 13:15:04,903 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:04,903 INFO L399 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:04,904 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:04,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:04,904 INFO L82 PathProgramCache]: Analyzing trace with hash -378433900, now seen corresponding path program 1 times [2019-09-05 13:15:04,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:04,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:04,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:04,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:04,906 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:04,913 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:04,913 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:04,913 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:15:04,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:04,926 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:15:04,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:04,936 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2019-09-05 13:15:04,936 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56] [2019-09-05 13:15:04,938 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:15:04,939 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:15:04,966 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:15:04,966 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:15:04,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:04,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:15:04,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:04,967 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:04,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:04,990 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:15:05,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:05,001 INFO L256 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-05 13:15:05,003 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:05,059 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-05 13:15:05,060 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:05,123 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:05,150 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:05,196 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-09-05 13:15:05,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:15:05,201 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2019-09-05 13:15:05,201 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:05,201 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-05 13:15:05,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-05 13:15:05,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-09-05 13:15:05,202 INFO L87 Difference]: Start difference. First operand 52 states and 69 transitions. Second operand 12 states. [2019-09-05 13:15:13,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:13,287 INFO L93 Difference]: Finished difference Result 66 states and 85 transitions. [2019-09-05 13:15:13,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-05 13:15:13,288 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2019-09-05 13:15:13,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:13,290 INFO L225 Difference]: With dead ends: 66 [2019-09-05 13:15:13,290 INFO L226 Difference]: Without dead ends: 59 [2019-09-05 13:15:13,291 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:15:13,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-09-05 13:15:13,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2019-09-05 13:15:13,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2019-09-05 13:15:13,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2019-09-05 13:15:13,298 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 25 [2019-09-05 13:15:13,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:13,299 INFO L475 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2019-09-05 13:15:13,299 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-05 13:15:13,299 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2019-09-05 13:15:13,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-09-05 13:15:13,300 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:13,300 INFO L399 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:13,301 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:13,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:13,301 INFO L82 PathProgramCache]: Analyzing trace with hash -223920524, now seen corresponding path program 1 times [2019-09-05 13:15:13,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:13,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:13,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:13,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:13,303 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:13,307 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:13,307 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:13,308 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:15:13,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:13,319 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:15:13,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:13,332 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2019-09-05 13:15:13,333 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [23], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2019-09-05 13:15:13,335 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:15:13,336 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:15:13,354 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:15:13,355 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:15:13,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:13,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:15:13,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:13,356 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:13,389 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:13,390 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:15:13,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:13,410 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 23 conjunts are in the unsatisfiable core [2019-09-05 13:15:13,414 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:13,484 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-09-05 13:15:13,484 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:13,556 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:13,578 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-09-05 13:15:13,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:15:13,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-09-05 13:15:13,622 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:13,624 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-05 13:15:13,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-05 13:15:13,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:15:13,624 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand 14 states. [2019-09-05 13:15:14,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:14,031 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-09-05 13:15:14,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 13:15:14,031 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2019-09-05 13:15:14,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:14,033 INFO L225 Difference]: With dead ends: 74 [2019-09-05 13:15:14,033 INFO L226 Difference]: Without dead ends: 74 [2019-09-05 13:15:14,034 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2019-09-05 13:15:14,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-09-05 13:15:14,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2019-09-05 13:15:14,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-09-05 13:15:14,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 89 transitions. [2019-09-05 13:15:14,042 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 89 transitions. Word has length 47 [2019-09-05 13:15:14,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:14,043 INFO L475 AbstractCegarLoop]: Abstraction has 73 states and 89 transitions. [2019-09-05 13:15:14,043 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-05 13:15:14,043 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 89 transitions. [2019-09-05 13:15:14,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-09-05 13:15:14,045 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:14,045 INFO L399 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:14,045 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:14,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:14,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1224693684, now seen corresponding path program 2 times [2019-09-05 13:15:14,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:14,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:14,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:14,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:14,047 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:14,052 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:14,052 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:14,052 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:15:14,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:15:14,074 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:15:14,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:14,090 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:15:14,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:15:14,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:14,091 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:14,101 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-05 13:15:14,101 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-05 13:15:14,118 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-05 13:15:14,118 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:15:14,119 INFO L256 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 14 conjunts are in the unsatisfiable core [2019-09-05 13:15:14,122 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:14,174 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 18 proven. 6 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-09-05 13:15:14,175 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:14,406 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2019-09-05 13:15:14,409 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-09-05 13:15:14,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2019-09-05 13:15:14,410 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-05 13:15:14,410 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-05 13:15:14,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-05 13:15:14,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-05 13:15:14,411 INFO L87 Difference]: Start difference. First operand 73 states and 89 transitions. Second operand 5 states. [2019-09-05 13:15:16,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:15:16,501 INFO L93 Difference]: Finished difference Result 81 states and 95 transitions. [2019-09-05 13:15:16,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-05 13:15:16,501 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 57 [2019-09-05 13:15:16,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:15:16,503 INFO L225 Difference]: With dead ends: 81 [2019-09-05 13:15:16,504 INFO L226 Difference]: Without dead ends: 79 [2019-09-05 13:15:16,504 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-09-05 13:15:16,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-09-05 13:15:16,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2019-09-05 13:15:16,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-09-05 13:15:16,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 90 transitions. [2019-09-05 13:15:16,512 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 90 transitions. Word has length 57 [2019-09-05 13:15:16,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:15:16,513 INFO L475 AbstractCegarLoop]: Abstraction has 79 states and 90 transitions. [2019-09-05 13:15:16,513 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-05 13:15:16,513 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 90 transitions. [2019-09-05 13:15:16,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-09-05 13:15:16,514 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:15:16,514 INFO L399 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:15:16,515 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:15:16,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:16,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1975458643, now seen corresponding path program 1 times [2019-09-05 13:15:16,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:15:16,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:16,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:15:16,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:15:16,516 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:15:16,521 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:15:16,521 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:15:16,521 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:15:16,539 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:16,539 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:15:16,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:16,554 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 69 with the following transitions: [2019-09-05 13:15:16,555 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [21], [23], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [61], [62] [2019-09-05 13:15:16,558 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:15:16,558 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:15:16,578 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:15:16,578 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:15:16,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:15:16,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:15:16,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:15:16,580 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:15:16,595 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:15:16,595 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-05 13:15:16,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:15:16,615 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 26 conjunts are in the unsatisfiable core [2019-09-05 13:15:16,618 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:15:16,689 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:16,712 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 21 proven. 38 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-09-05 13:15:16,712 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:15:16,932 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:16,936 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:15:16,983 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-09-05 13:15:16,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:15:16,993 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-09-05 13:15:16,993 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:15:16,993 INFO L454 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-09-05 13:15:16,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-09-05 13:15:16,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2019-09-05 13:15:16,995 INFO L87 Difference]: Start difference. First operand 79 states and 90 transitions. Second operand 14 states. [2019-09-05 13:15:23,784 WARN L188 SmtUtils]: Spent 2.15 s on a formula simplification that was a NOOP. DAG size: 33 [2019-09-05 13:15:44,216 WARN L188 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2019-09-05 13:16:00,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:16:00,069 INFO L93 Difference]: Finished difference Result 83 states and 93 transitions. [2019-09-05 13:16:00,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-05 13:16:00,070 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2019-09-05 13:16:00,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:16:00,071 INFO L225 Difference]: With dead ends: 83 [2019-09-05 13:16:00,072 INFO L226 Difference]: Without dead ends: 83 [2019-09-05 13:16:00,072 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=80, Invalid=299, Unknown=1, NotChecked=0, Total=380 [2019-09-05 13:16:00,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-09-05 13:16:00,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-09-05 13:16:00,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-09-05 13:16:00,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2019-09-05 13:16:00,090 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 68 [2019-09-05 13:16:00,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:16:00,091 INFO L475 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2019-09-05 13:16:00,091 INFO L476 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-09-05 13:16:00,094 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2019-09-05 13:16:00,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-09-05 13:16:00,095 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:16:00,096 INFO L399 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:16:00,096 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:16:00,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:16:00,098 INFO L82 PathProgramCache]: Analyzing trace with hash 713083767, now seen corresponding path program 1 times [2019-09-05 13:16:00,098 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:16:00,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:00,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:16:00,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:00,099 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:16:00,106 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:16:00,107 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:16:00,107 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:16:00,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:16:00,132 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:16:00,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:16:00,149 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 74 with the following transitions: [2019-09-05 13:16:00,149 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [21], [23], [35], [38], [40], [43], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59], [60], [61], [62], [63], [64] [2019-09-05 13:16:00,152 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-05 13:16:00,152 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-05 13:16:00,167 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-05 13:16:00,167 INFO L272 AbstractInterpreter]: Visited 15 different actions 20 times. Never merged. Never widened. Performed 19 root evaluator evaluations with a maximum evaluation depth of 9. Performed 19 inverse root evaluator evaluations with a maximum inverse evaluation depth of 9. Never found a fixpoint. Largest state had 6 variables. [2019-09-05 13:16:00,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:16:00,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-05 13:16:00,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:16:00,168 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-05 13:16:00,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:16:00,187 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:16:00,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:16:00,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 24 conjunts are in the unsatisfiable core [2019-09-05 13:16:00,212 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:16:00,313 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:16:00,341 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-09-05 13:16:00,341 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:16:00,533 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:16:00,559 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:16:00,610 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 23 proven. 41 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-09-05 13:16:00,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:16:00,614 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2019-09-05 13:16:00,614 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:16:00,614 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-05 13:16:00,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-05 13:16:00,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-09-05 13:16:00,615 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 15 states. [2019-09-05 13:16:23,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:16:23,549 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2019-09-05 13:16:23,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-05 13:16:23,550 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2019-09-05 13:16:23,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:16:23,551 INFO L225 Difference]: With dead ends: 105 [2019-09-05 13:16:23,552 INFO L226 Difference]: Without dead ends: 98 [2019-09-05 13:16:23,552 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 131 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=101, Invalid=358, Unknown=3, NotChecked=0, Total=462 [2019-09-05 13:16:23,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-09-05 13:16:23,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2019-09-05 13:16:23,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2019-09-05 13:16:23,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 99 transitions. [2019-09-05 13:16:23,569 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 99 transitions. Word has length 73 [2019-09-05 13:16:23,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:16:23,569 INFO L475 AbstractCegarLoop]: Abstraction has 96 states and 99 transitions. [2019-09-05 13:16:23,569 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-05 13:16:23,569 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 99 transitions. [2019-09-05 13:16:23,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-09-05 13:16:23,571 INFO L391 BasicCegarLoop]: Found error trace [2019-09-05 13:16:23,571 INFO L399 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-09-05 13:16:23,571 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-05 13:16:23,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-05 13:16:23,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1818484460, now seen corresponding path program 3 times [2019-09-05 13:16:23,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-05 13:16:23,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:23,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-05 13:16:23,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-05 13:16:23,573 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-05 13:16:23,579 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-05 13:16:23,579 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-05 13:16:23,579 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-05 13:16:23,589 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-05 13:16:23,589 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-05 13:16:23,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-05 13:16:23,607 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-05 13:16:23,607 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-05 13:16:23,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-05 13:16:23,607 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-05 13:16:23,619 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-05 13:16:23,619 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-09-05 13:16:23,647 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-05 13:16:23,647 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-05 13:16:23,649 INFO L256 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 31 conjunts are in the unsatisfiable core [2019-09-05 13:16:23,652 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-05 13:16:23,752 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 25 proven. 54 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-09-05 13:16:23,752 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-05 13:16:24,248 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:16:24,289 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-05 13:16:24,360 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 25 proven. 54 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-09-05 13:16:24,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-05 13:16:24,364 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2019-09-05 13:16:24,364 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-05 13:16:24,368 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-05 13:16:24,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-05 13:16:24,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2019-09-05 13:16:24,370 INFO L87 Difference]: Start difference. First operand 96 states and 99 transitions. Second operand 16 states. [2019-09-05 13:16:25,130 WARN L188 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 38 [2019-09-05 13:16:27,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-05 13:16:27,747 INFO L93 Difference]: Finished difference Result 105 states and 117 transitions. [2019-09-05 13:16:27,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-09-05 13:16:27,748 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2019-09-05 13:16:27,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-05 13:16:27,748 INFO L225 Difference]: With dead ends: 105 [2019-09-05 13:16:27,749 INFO L226 Difference]: Without dead ends: 0 [2019-09-05 13:16:27,749 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2019-09-05 13:16:27,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-09-05 13:16:27,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-09-05 13:16:27,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-09-05 13:16:27,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-09-05 13:16:27,751 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 79 [2019-09-05 13:16:27,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-05 13:16:27,751 INFO L475 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-09-05 13:16:27,751 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-05 13:16:27,751 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-09-05 13:16:27,751 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-09-05 13:16:27,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.09 01:16:27 BoogieIcfgContainer [2019-09-05 13:16:27,755 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-05 13:16:27,757 INFO L168 Benchmark]: Toolchain (without parser) took 87784.35 ms. Allocated memory was 137.9 MB in the beginning and 326.1 MB in the end (delta: 188.2 MB). Free memory was 85.7 MB in the beginning and 242.4 MB in the end (delta: -156.8 MB). Peak memory consumption was 31.5 MB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,757 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 137.9 MB. Free memory was 104.0 MB in the beginning and 103.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,758 INFO L168 Benchmark]: CACSL2BoogieTranslator took 342.63 ms. Allocated memory was 137.9 MB in the beginning and 197.7 MB in the end (delta: 59.8 MB). Free memory was 85.5 MB in the beginning and 176.1 MB in the end (delta: -90.7 MB). Peak memory consumption was 20.5 MB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,759 INFO L168 Benchmark]: Boogie Preprocessor took 32.24 ms. Allocated memory is still 197.7 MB. Free memory was 176.1 MB in the beginning and 173.8 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,760 INFO L168 Benchmark]: RCFGBuilder took 235.05 ms. Allocated memory is still 197.7 MB. Free memory was 173.8 MB in the beginning and 162.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,761 INFO L168 Benchmark]: TraceAbstraction took 87170.66 ms. Allocated memory was 197.7 MB in the beginning and 326.1 MB in the end (delta: 128.5 MB). Free memory was 161.4 MB in the beginning and 242.4 MB in the end (delta: -81.0 MB). Peak memory consumption was 47.4 MB. Max. memory is 7.1 GB. [2019-09-05 13:16:27,764 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 137.9 MB. Free memory was 104.0 MB in the beginning and 103.8 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 342.63 ms. Allocated memory was 137.9 MB in the beginning and 197.7 MB in the end (delta: 59.8 MB). Free memory was 85.5 MB in the beginning and 176.1 MB in the end (delta: -90.7 MB). Peak memory consumption was 20.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.24 ms. Allocated memory is still 197.7 MB. Free memory was 176.1 MB in the beginning and 173.8 MB in the end (delta: 2.3 MB). Peak memory consumption was 2.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 235.05 ms. Allocated memory is still 197.7 MB. Free memory was 173.8 MB in the beginning and 162.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 87170.66 ms. Allocated memory was 197.7 MB in the beginning and 326.1 MB in the end (delta: 128.5 MB). Free memory was 161.4 MB in the beginning and 242.4 MB in the end (delta: -81.0 MB). Peak memory consumption was 47.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 12]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 29 locations, 1 error locations. SAFE Result, 87.1s OverallTime, 10 OverallIterations, 14 TraceHistogramMax, 83.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 254 SDtfs, 167 SDslu, 930 SDs, 0 SdLazy, 1512 SolverSat, 295 SolverUnsat, 38 SolverUnknown, 0 SolverNotchecked, 74.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 797 GetRequests, 673 SyntacticMatches, 4 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 9.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=96occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 6 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 7 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.7s InterpolantComputationTime, 788 NumberOfCodeBlocks, 753 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 770 ConstructedInterpolants, 12 QuantifiedInterpolants, 243954 SizeOfPredicates, 32 NumberOfNonLiveVariables, 777 ConjunctsInSsa, 171 ConjunctsInUnsatCore, 18 InterpolantComputations, 3 PerfectInterpolantSequences, 2054/2394 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...