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/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fea9116 [2019-09-20 13:25:23,793 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-20 13:25:23,796 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-20 13:25:23,809 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-09-20 13:25:23,870 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-20 13:25:23,871 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-20 13:25:23,871 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-20 13:25:23,872 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 [2019-09-20 13:25:23,892 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-20 13:25:23,892 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-20 13:25:23,892 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-20 13:25:23,893 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-20 13:25:23,894 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-20 13:25:23,894 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-20 13:25:23,895 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-20 13:25:23,895 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-20 13:25:23,895 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-20 13:25:23,896 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-20 13:25:23,896 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-20 13:25:23,897 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-20 13:25:23,897 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-20 13:25:23,897 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-20 13:25:23,897 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-20 13:25:23,897 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-20 13:25:23,898 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-20 13:25:23,898 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-20 13:25:23,899 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-20 13:25:23,900 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-20 13:25:23,900 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-20 13:25:23,900 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-20 13:25:23,900 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-20 13:25:23,901 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-20 13:25:23,901 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-20 13:25:23,901 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-20 13:25:23,901 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-20 13:25:23,902 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-20 13:25:23,902 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-20 13:25:23,902 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-20 13:25:23,962 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-20 13:25:23,979 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-20 13:25:23,984 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-20 13:25:23,987 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-20 13:25:23,989 INFO L275 PluginConnector]: CDTParser initialized [2019-09-20 13:25:23,990 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-09-20 13:25:24,053 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d47270b00/45367fddd3cb421e8e01295f224d2f7f/FLAG393b8e3ea [2019-09-20 13:25:24,499 INFO L306 CDTParser]: Found 1 translation units. [2019-09-20 13:25:24,499 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-09-20 13:25:24,511 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d47270b00/45367fddd3cb421e8e01295f224d2f7f/FLAG393b8e3ea [2019-09-20 13:25:24,901 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d47270b00/45367fddd3cb421e8e01295f224d2f7f [2019-09-20 13:25:24,909 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-20 13:25:24,911 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-20 13:25:24,912 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:24,912 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-20 13:25:24,916 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-20 13:25:24,917 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:24" (1/1) ... [2019-09-20 13:25:24,920 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@495414a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:24, skipping insertion in model container [2019-09-20 13:25:24,920 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:25:24" (1/1) ... [2019-09-20 13:25:24,928 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-20 13:25:24,943 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-20 13:25:25,169 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:25,176 INFO L188 MainTranslator]: Completed pre-run [2019-09-20 13:25:25,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-20 13:25:25,215 INFO L192 MainTranslator]: Completed translation [2019-09-20 13:25:25,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25 WrapperNode [2019-09-20 13:25:25,216 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-20 13:25:25,217 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-20 13:25:25,217 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-20 13:25:25,217 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-20 13:25:25,368 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,370 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,376 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,377 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,382 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,388 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,389 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (1/1) ... [2019-09-20 13:25:25,390 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-20 13:25:25,391 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-20 13:25:25,391 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-20 13:25:25,391 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-20 13:25:25,392 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (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 [2019-09-20 13:25:25,460 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-20 13:25:25,460 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-20 13:25:25,460 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-20 13:25:25,461 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-20 13:25:25,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-20 13:25:25,461 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-20 13:25:25,461 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-20 13:25:25,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-20 13:25:25,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-20 13:25:25,614 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-20 13:25:25,614 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-20 13:25:25,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:25 BoogieIcfgContainer [2019-09-20 13:25:25,616 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-20 13:25:25,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-20 13:25:25,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-20 13:25:25,619 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-20 13:25:25,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:25:24" (1/3) ... [2019-09-20 13:25:25,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73263e02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:25, skipping insertion in model container [2019-09-20 13:25:25,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:25:25" (2/3) ... [2019-09-20 13:25:25,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73263e02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:25:25, skipping insertion in model container [2019-09-20 13:25:25,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:25:25" (3/3) ... [2019-09-20 13:25:25,623 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2019-09-20 13:25:25,633 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-20 13:25:25,640 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-20 13:25:25,657 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-20 13:25:25,685 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-20 13:25:25,685 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-20 13:25:25,685 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-20 13:25:25,685 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-20 13:25:25,685 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-20 13:25:25,686 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-20 13:25:25,686 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-20 13:25:25,686 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-20 13:25:25,701 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-20 13:25:25,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-20 13:25:25,710 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:25,711 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:25,713 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:25,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:25,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-20 13:25:25,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:25,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:25,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:25,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:25,764 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:25,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:25,957 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-20 13:25:25,958 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-20 13:25:25,958 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-20 13:25:25,966 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-20 13:25:25,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-20 13:25:25,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-20 13:25:25,995 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-09-20 13:25:26,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:26,046 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-20 13:25:26,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 13:25:26,048 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-20 13:25:26,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:26,058 INFO L225 Difference]: With dead ends: 18 [2019-09-20 13:25:26,058 INFO L226 Difference]: Without dead ends: 12 [2019-09-20 13:25:26,062 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-20 13:25:26,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-20 13:25:26,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-20 13:25:26,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-20 13:25:26,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-20 13:25:26,115 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-20 13:25:26,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:26,116 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-20 13:25:26,116 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-20 13:25:26,116 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-20 13:25:26,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-20 13:25:26,117 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:26,117 INFO L407 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:26,117 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:26,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:26,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-20 13:25:26,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:26,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:26,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:26,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:26,120 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:26,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:26,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:26,271 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:26,272 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 12 with the following transitions: [2019-09-20 13:25:26,274 INFO L207 CegarAbsIntRunner]: [0], [4], [11], [13], [19], [22], [24], [30], [31], [32], [34] [2019-09-20 13:25:26,304 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-20 13:25:26,304 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-20 13:25:26,367 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2019-09-20 13:25:26,434 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-20 13:25:26,437 INFO L272 AbstractInterpreter]: Visited 11 different actions 41 times. Merged at 2 different actions 10 times. Widened at 1 different actions 3 times. Performed 74 root evaluator evaluations with a maximum evaluation depth of 6. Performed 74 inverse root evaluator evaluations with a maximum inverse evaluation depth of 6. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2019-09-20 13:25:26,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:26,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-20 13:25:26,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:26,441 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 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:26,461 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:26,462 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-20 13:25:26,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:26,479 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-20 13:25:26,487 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:26,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,541 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:26,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:26,620 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 6] total 9 [2019-09-20 13:25:26,620 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:26,621 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-20 13:25:26,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-20 13:25:26,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2019-09-20 13:25:26,622 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2019-09-20 13:25:26,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:26,654 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2019-09-20 13:25:26,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-20 13:25:26,655 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2019-09-20 13:25:26,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:26,656 INFO L225 Difference]: With dead ends: 13 [2019-09-20 13:25:26,656 INFO L226 Difference]: Without dead ends: 13 [2019-09-20 13:25:26,657 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2019-09-20 13:25:26,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-20 13:25:26,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-20 13:25:26,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-20 13:25:26,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-20 13:25:26,661 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-20 13:25:26,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:26,661 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-20 13:25:26,661 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-20 13:25:26,661 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-20 13:25:26,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-20 13:25:26,662 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:26,662 INFO L407 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:26,662 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:26,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:26,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-20 13:25:26,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:26,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:26,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:26,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:26,665 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:26,788 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:26,789 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:26,789 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:26,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:26,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:26,790 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) [2019-09-20 13:25:26,809 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:26,810 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:26,825 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-20 13:25:26,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:26,826 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-20 13:25:26,828 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:26,869 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,869 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:26,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:26,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:26,966 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 11 [2019-09-20 13:25:26,967 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:26,967 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-20 13:25:26,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-20 13:25:26,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-09-20 13:25:26,970 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 8 states. [2019-09-20 13:25:27,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:27,013 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2019-09-20 13:25:27,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-20 13:25:27,013 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2019-09-20 13:25:27,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:27,014 INFO L225 Difference]: With dead ends: 14 [2019-09-20 13:25:27,014 INFO L226 Difference]: Without dead ends: 14 [2019-09-20 13:25:27,015 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-09-20 13:25:27,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-20 13:25:27,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-20 13:25:27,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-20 13:25:27,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-20 13:25:27,019 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-20 13:25:27,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:27,019 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-20 13:25:27,019 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-20 13:25:27,019 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-20 13:25:27,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-20 13:25:27,020 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:27,020 INFO L407 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:27,021 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:27,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:27,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-20 13:25:27,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:27,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:27,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,024 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:27,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:27,187 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,187 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,187 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:27,188 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:27,188 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:27,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,188 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-20 13:25:27,208 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-20 13:25:27,208 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:27,226 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-20 13:25:27,226 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:27,227 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-20 13:25:27,229 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:27,259 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,259 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:27,356 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:27,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 8] total 13 [2019-09-20 13:25:27,361 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:27,361 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-20 13:25:27,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-20 13:25:27,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:25:27,362 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2019-09-20 13:25:27,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:27,417 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-09-20 13:25:27,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-20 13:25:27,417 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2019-09-20 13:25:27,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:27,418 INFO L225 Difference]: With dead ends: 15 [2019-09-20 13:25:27,418 INFO L226 Difference]: Without dead ends: 15 [2019-09-20 13:25:27,419 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2019-09-20 13:25:27,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-20 13:25:27,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-20 13:25:27,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-20 13:25:27,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-20 13:25:27,422 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-20 13:25:27,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:27,422 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-20 13:25:27,422 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-20 13:25:27,422 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-20 13:25:27,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-20 13:25:27,423 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:27,423 INFO L407 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:27,423 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:27,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:27,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-20 13:25:27,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:27,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:27,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,426 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:27,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:27,551 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,552 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:27,552 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:27,552 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:27,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,552 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) [2019-09-20 13:25:27,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:27,577 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 [2019-09-20 13:25:27,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:27,588 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-20 13:25:27,589 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:27,620 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,620 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:27,741 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:27,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 9] total 15 [2019-09-20 13:25:27,745 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:27,746 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-20 13:25:27,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-20 13:25:27,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2019-09-20 13:25:27,747 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 10 states. [2019-09-20 13:25:27,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:27,826 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2019-09-20 13:25:27,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-20 13:25:27,826 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-09-20 13:25:27,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:27,827 INFO L225 Difference]: With dead ends: 16 [2019-09-20 13:25:27,827 INFO L226 Difference]: Without dead ends: 16 [2019-09-20 13:25:27,828 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2019-09-20 13:25:27,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-20 13:25:27,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-20 13:25:27,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-20 13:25:27,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-20 13:25:27,831 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-20 13:25:27,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:27,831 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-20 13:25:27,831 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-20 13:25:27,831 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-20 13:25:27,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-20 13:25:27,832 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:27,832 INFO L407 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:27,832 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:27,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:27,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-20 13:25:27,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:27,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-20 13:25:27,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:27,835 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:27,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-20 13:25:27,978 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:27,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,979 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-09-20 13:25:27,979 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-20 13:25:27,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-20 13:25:27,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-20 13:25:27,979 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-20 13:25:28,007 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-20 13:25:28,007 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-20 13:25:28,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-20 13:25:28,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-20 13:25:28,025 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-20 13:25:28,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-20 13:25:28,056 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:28,056 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-20 13:25:28,200 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-20 13:25:28,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-09-20 13:25:28,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 10] total 17 [2019-09-20 13:25:28,205 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-20 13:25:28,205 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-20 13:25:28,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-20 13:25:28,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2019-09-20 13:25:28,206 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 11 states. [2019-09-20 13:25:28,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-20 13:25:28,272 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2019-09-20 13:25:28,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-20 13:25:28,273 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2019-09-20 13:25:28,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-20 13:25:28,274 INFO L225 Difference]: With dead ends: 17 [2019-09-20 13:25:28,274 INFO L226 Difference]: Without dead ends: 17 [2019-09-20 13:25:28,275 INFO L636 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=203, Unknown=0, NotChecked=0, Total=272 [2019-09-20 13:25:28,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-20 13:25:28,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-20 13:25:28,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-20 13:25:28,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-20 13:25:28,278 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-20 13:25:28,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-20 13:25:28,278 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-20 13:25:28,279 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-20 13:25:28,279 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-20 13:25:28,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-20 13:25:28,279 INFO L399 BasicCegarLoop]: Found error trace [2019-09-20 13:25:28,279 INFO L407 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-20 13:25:28,280 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-20 13:25:28,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-20 13:25:28,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-20 13:25:28,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-20 13:25:28,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:28,282 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-20 13:25:28,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-20 13:25:28,282 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-20 13:25:28,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-20 13:25:28,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-20 13:25:28,366 INFO L474 BasicCegarLoop]: Counterexample might be feasible [2019-09-20 13:25:28,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.09 01:25:28 BoogieIcfgContainer [2019-09-20 13:25:28,397 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-20 13:25:28,399 INFO L168 Benchmark]: Toolchain (without parser) took 3487.62 ms. Allocated memory was 139.5 MB in the beginning and 257.9 MB in the end (delta: 118.5 MB). Free memory was 87.6 MB in the beginning and 228.6 MB in the end (delta: -141.0 MB). Peak memory consumption was 104.1 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,400 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 105.5 MB in the beginning and 105.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,401 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.36 ms. Allocated memory is still 139.5 MB. Free memory was 87.4 MB in the beginning and 78.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,402 INFO L168 Benchmark]: Boogie Preprocessor took 173.86 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 78.2 MB in the beginning and 179.9 MB in the end (delta: -101.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,403 INFO L168 Benchmark]: RCFGBuilder took 225.10 ms. Allocated memory is still 202.4 MB. Free memory was 179.9 MB in the beginning and 168.7 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,404 INFO L168 Benchmark]: TraceAbstraction took 2780.09 ms. Allocated memory was 202.4 MB in the beginning and 257.9 MB in the end (delta: 55.6 MB). Free memory was 168.7 MB in the beginning and 228.6 MB in the end (delta: -59.9 MB). Peak memory consumption was 122.3 MB. Max. memory is 7.1 GB. [2019-09-20 13:25:28,412 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 105.5 MB in the beginning and 105.2 MB in the end (delta: 212.8 kB). Peak memory consumption was 212.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.36 ms. Allocated memory is still 139.5 MB. Free memory was 87.4 MB in the beginning and 78.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 173.86 ms. Allocated memory was 139.5 MB in the beginning and 202.4 MB in the end (delta: 62.9 MB). Free memory was 78.2 MB in the beginning and 179.9 MB in the end (delta: -101.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 225.10 ms. Allocated memory is still 202.4 MB. Free memory was 179.9 MB in the beginning and 168.7 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2780.09 ms. Allocated memory was 202.4 MB in the beginning and 257.9 MB in the end (delta: 55.6 MB). Free memory was 168.7 MB in the beginning and 228.6 MB in the end (delta: -59.9 MB). Peak memory consumption was 122.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. UNSAFE Result, 2.7s OverallTime, 7 OverallIterations, 6 TraceHistogramMax, 0.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 66 SDtfs, 1 SDslu, 248 SDs, 0 SdLazy, 191 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 176 GetRequests, 97 SyntacticMatches, 21 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 17 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 8269 SizeOfPredicates, 0 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 0/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...