java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 15:55:29,548 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 15:55:29,551 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 15:55:29,566 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 15:55:29,567 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 15:55:29,570 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 15:55:29,572 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 15:55:29,574 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 15:55:29,576 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 15:55:29,580 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 15:55:29,581 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 15:55:29,581 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 15:55:29,583 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 15:55:29,585 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 15:55:29,593 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 15:55:29,594 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 15:55:29,596 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 15:55:29,600 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 15:55:29,603 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 15:55:29,605 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 15:55:29,606 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 15:55:29,609 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 15:55:29,614 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 15:55:29,623 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 15:55:29,647 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 15:55:29,647 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 15:55:29,648 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 15:55:29,648 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 15:55:29,648 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 15:55:29,649 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 15:55:29,649 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 15:55:29,649 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 15:55:29,649 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 15:55:29,649 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 15:55:29,649 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 15:55:29,650 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 15:55:29,651 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 15:55:29,652 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 15:55:29,652 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 15:55:29,652 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 15:55:29,653 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 15:55:29,653 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 15:55:29,653 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 15:55:29,653 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 15:55:29,653 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 15:55:29,654 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 15:55:29,654 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 15:55:29,654 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 15:55:29,654 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 15:55:29,654 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 15:55:29,655 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 15:55:29,656 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 15:55:29,657 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 15:55:29,657 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 15:55:29,657 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 15:55:29,657 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 15:55:29,657 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 15:55:29,658 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 15:55:29,718 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 15:55:29,732 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 15:55:29,736 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 15:55:29,738 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 15:55:29,738 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 15:55:29,739 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-22 15:55:29,804 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/039ef2f9d/9a2dbdc0d150402ca8c848c070b281a9/FLAG67499c8ee [2018-10-22 15:55:30,274 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 15:55:30,275 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-22 15:55:30,286 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/039ef2f9d/9a2dbdc0d150402ca8c848c070b281a9/FLAG67499c8ee [2018-10-22 15:55:30,301 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/039ef2f9d/9a2dbdc0d150402ca8c848c070b281a9 [2018-10-22 15:55:30,311 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 15:55:30,313 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 15:55:30,314 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 15:55:30,314 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 15:55:30,319 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 15:55:30,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,323 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@158e31e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30, skipping insertion in model container [2018-10-22 15:55:30,323 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,334 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 15:55:30,379 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 15:55:30,697 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:55:30,707 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 15:55:30,756 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 15:55:30,790 INFO L193 MainTranslator]: Completed translation [2018-10-22 15:55:30,790 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30 WrapperNode [2018-10-22 15:55:30,790 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 15:55:30,791 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 15:55:30,791 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 15:55:30,792 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 15:55:30,800 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,813 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,842 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 15:55:30,843 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 15:55:30,843 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 15:55:30,843 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 15:55:30,852 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,853 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,858 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,858 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,866 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,875 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,877 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... [2018-10-22 15:55:30,883 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 15:55:30,884 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 15:55:30,884 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 15:55:30,884 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 15:55:30,885 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 15:55:31,026 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 15:55:31,026 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 15:55:31,026 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2018-10-22 15:55:31,026 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2018-10-22 15:55:31,027 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 15:55:31,027 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 15:55:31,027 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2018-10-22 15:55:31,027 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2018-10-22 15:55:31,027 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2018-10-22 15:55:31,027 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2018-10-22 15:55:31,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 15:55:31,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 15:55:31,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 15:55:31,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 15:55:31,705 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 15:55:31,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:55:31 BoogieIcfgContainer [2018-10-22 15:55:31,706 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 15:55:31,708 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 15:55:31,708 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 15:55:31,711 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 15:55:31,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 03:55:30" (1/3) ... [2018-10-22 15:55:31,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bea3f2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:55:31, skipping insertion in model container [2018-10-22 15:55:31,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 03:55:30" (2/3) ... [2018-10-22 15:55:31,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bea3f2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 03:55:31, skipping insertion in model container [2018-10-22 15:55:31,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 03:55:31" (3/3) ... [2018-10-22 15:55:31,715 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24_false-unreach-call.i [2018-10-22 15:55:31,726 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 15:55:31,735 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 15:55:31,753 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 15:55:31,785 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 15:55:31,785 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 15:55:31,786 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 15:55:31,786 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 15:55:31,786 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 15:55:31,786 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 15:55:31,787 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 15:55:31,787 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 15:55:31,787 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 15:55:31,807 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2018-10-22 15:55:31,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 15:55:31,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:31,815 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:31,817 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:31,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:31,825 INFO L82 PathProgramCache]: Analyzing trace with hash 277346705, now seen corresponding path program 1 times [2018-10-22 15:55:31,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:31,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:31,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:31,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:31,878 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:31,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:55:31,975 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:55:31,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 15:55:31,978 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:55:31,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 15:55:31,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 15:55:31,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 15:55:31,999 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 2 states. [2018-10-22 15:55:32,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:32,030 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2018-10-22 15:55:32,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 15:55:32,032 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-22 15:55:32,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:32,045 INFO L225 Difference]: With dead ends: 101 [2018-10-22 15:55:32,045 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 15:55:32,049 INFO L605 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 [2018-10-22 15:55:32,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 15:55:32,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-22 15:55:32,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-22 15:55:32,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2018-10-22 15:55:32,115 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 13 [2018-10-22 15:55:32,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:32,115 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2018-10-22 15:55:32,115 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 15:55:32,116 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2018-10-22 15:55:32,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 15:55:32,116 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:32,117 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:32,119 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:32,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:32,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1161873536, now seen corresponding path program 1 times [2018-10-22 15:55:32,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:32,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:32,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:32,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:32,121 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:32,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 15:55:32,225 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 15:55:32,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 15:55:32,226 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:55:32,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 15:55:32,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 15:55:32,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:55:32,229 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand 3 states. [2018-10-22 15:55:32,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:32,423 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2018-10-22 15:55:32,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 15:55:32,424 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-22 15:55:32,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:32,426 INFO L225 Difference]: With dead ends: 113 [2018-10-22 15:55:32,426 INFO L226 Difference]: Without dead ends: 74 [2018-10-22 15:55:32,428 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 15:55:32,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-22 15:55:32,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2018-10-22 15:55:32,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 15:55:32,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2018-10-22 15:55:32,447 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 15 [2018-10-22 15:55:32,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:32,447 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2018-10-22 15:55:32,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 15:55:32,448 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2018-10-22 15:55:32,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 15:55:32,449 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:32,449 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:32,450 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:32,450 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:32,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1375381986, now seen corresponding path program 1 times [2018-10-22 15:55:32,450 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:32,451 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:32,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:32,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:32,452 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:32,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:32,599 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:55:32,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:32,599 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:32,600 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-22 15:55:32,602 INFO L202 CegarAbsIntRunner]: [2], [3], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [113], [120], [123], [125], [131], [132], [133], [141] [2018-10-22 15:55:32,657 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:55:32,658 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:55:32,892 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:55:34,859 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:55:34,860 INFO L272 AbstractInterpreter]: Visited 23 different actions 269 times. Merged at 10 different actions 204 times. Widened at 3 different actions 50 times. Found 2 fixpoints after 2 different actions. Largest state had 35 variables. [2018-10-22 15:55:34,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:34,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:55:34,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:34,904 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 15:55:34,919 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:34,919 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:34,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:34,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:35,125 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:55:35,125 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:35,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:55:35,457 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:35,457 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:35,488 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:35,488 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:35,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:35,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:35,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:55:35,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:36,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 15:55:36,282 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 3 imperfect interpolant sequences. [2018-10-22 15:55:36,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4, 4, 4] total 13 [2018-10-22 15:55:36,283 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 15:55:36,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:55:36,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:55:36,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:55:36,285 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2018-10-22 15:55:36,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:36,657 INFO L93 Difference]: Finished difference Result 80 states and 99 transitions. [2018-10-22 15:55:36,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:55:36,658 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-22 15:55:36,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:36,662 INFO L225 Difference]: With dead ends: 80 [2018-10-22 15:55:36,662 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 15:55:36,663 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-22 15:55:36,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 15:55:36,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 55. [2018-10-22 15:55:36,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 15:55:36,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2018-10-22 15:55:36,680 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 25 [2018-10-22 15:55:36,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:36,680 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2018-10-22 15:55:36,680 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:55:36,680 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2018-10-22 15:55:36,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-22 15:55:36,683 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:36,683 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:36,684 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:36,684 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:36,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1709557937, now seen corresponding path program 1 times [2018-10-22 15:55:36,684 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:36,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:36,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:36,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:36,686 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:36,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 15:55:36,796 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:36,797 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:36,797 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 36 with the following transitions: [2018-10-22 15:55:36,797 INFO L202 CegarAbsIntRunner]: [2], [3], [4], [5], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [58], [60], [64], [67], [109], [113], [120], [123], [125], [131], [132], [133], [135], [136], [141] [2018-10-22 15:55:36,800 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 15:55:36,800 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 15:55:36,819 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 15:55:40,215 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 15:55:40,215 INFO L272 AbstractInterpreter]: Visited 32 different actions 948 times. Merged at 16 different actions 630 times. Widened at 5 different actions 144 times. Found 64 fixpoints after 6 different actions. Largest state had 37 variables. [2018-10-22 15:55:40,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:40,226 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 15:55:40,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:40,226 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:40,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:40,235 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:40,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:40,279 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:40,380 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 15:55:40,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:40,685 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 15:55:40,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:40,716 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:40,733 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:40,733 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:40,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:40,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:40,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 15:55:40,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:40,931 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (5)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 15:55:40,935 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:40,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-10-22 15:55:40,935 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:40,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 15:55:40,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 15:55:40,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:55:40,937 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand 5 states. [2018-10-22 15:55:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:41,288 INFO L93 Difference]: Finished difference Result 157 states and 200 transitions. [2018-10-22 15:55:41,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-22 15:55:41,289 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-10-22 15:55:41,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:41,290 INFO L225 Difference]: With dead ends: 157 [2018-10-22 15:55:41,291 INFO L226 Difference]: Without dead ends: 113 [2018-10-22 15:55:41,291 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-22 15:55:41,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-10-22 15:55:41,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-10-22 15:55:41,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-22 15:55:41,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-10-22 15:55:41,303 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 35 [2018-10-22 15:55:41,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:41,304 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-10-22 15:55:41,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 15:55:41,304 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-10-22 15:55:41,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 15:55:41,306 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:41,306 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:41,307 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:41,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:41,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1875911917, now seen corresponding path program 2 times [2018-10-22 15:55:41,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:41,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:41,308 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:41,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:41,309 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:41,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:41,448 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:55:41,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:41,449 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:41,449 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:41,449 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:41,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:41,449 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:41,458 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:55:41,458 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:41,518 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:55:41,518 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:41,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:41,638 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:55:41,638 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:41,723 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:55:41,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:41,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:41,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:55:41,760 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:41,857 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:55:41,857 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:41,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:41,870 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:55:41,870 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:41,903 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 15:55:41,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:41,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-10-22 15:55:41,906 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:41,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 15:55:41,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 15:55:41,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:55:41,908 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 6 states. [2018-10-22 15:55:42,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:42,129 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2018-10-22 15:55:42,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 15:55:42,133 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2018-10-22 15:55:42,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:42,135 INFO L225 Difference]: With dead ends: 205 [2018-10-22 15:55:42,135 INFO L226 Difference]: Without dead ends: 139 [2018-10-22 15:55:42,137 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 15:55:42,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-22 15:55:42,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 106. [2018-10-22 15:55:42,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-22 15:55:42,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2018-10-22 15:55:42,150 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 45 [2018-10-22 15:55:42,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:42,151 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2018-10-22 15:55:42,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 15:55:42,151 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2018-10-22 15:55:42,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-22 15:55:42,153 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:42,153 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:42,153 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:42,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:42,154 INFO L82 PathProgramCache]: Analyzing trace with hash -588961457, now seen corresponding path program 3 times [2018-10-22 15:55:42,154 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:42,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:42,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:42,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:42,155 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:42,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:42,337 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-10-22 15:55:42,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:42,337 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:42,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:42,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:42,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:42,338 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:42,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:55:42,349 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:55:42,402 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 15:55:42,402 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:42,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:42,583 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 15:55:42,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:42,744 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 15:55:42,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:42,766 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:42,782 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:55:42,782 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:55:42,894 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-22 15:55:42,894 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:42,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:43,014 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 15:55:43,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:43,078 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-22 15:55:43,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:43,081 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7, 8, 8] total 21 [2018-10-22 15:55:43,081 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:43,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:55:43,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:55:43,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:55:43,084 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand 11 states. [2018-10-22 15:55:44,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:44,028 INFO L93 Difference]: Finished difference Result 462 states and 644 transitions. [2018-10-22 15:55:44,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 15:55:44,029 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-10-22 15:55:44,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:44,032 INFO L225 Difference]: With dead ends: 462 [2018-10-22 15:55:44,032 INFO L226 Difference]: Without dead ends: 370 [2018-10-22 15:55:44,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=275, Invalid=915, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 15:55:44,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2018-10-22 15:55:44,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 150. [2018-10-22 15:55:44,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-22 15:55:44,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 200 transitions. [2018-10-22 15:55:44,060 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 200 transitions. Word has length 55 [2018-10-22 15:55:44,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:44,060 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 200 transitions. [2018-10-22 15:55:44,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:55:44,061 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 200 transitions. [2018-10-22 15:55:44,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-22 15:55:44,063 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:44,063 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:44,064 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:44,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:44,064 INFO L82 PathProgramCache]: Analyzing trace with hash 175545882, now seen corresponding path program 4 times [2018-10-22 15:55:44,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:44,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:44,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:44,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:44,065 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:44,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:44,199 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-22 15:55:44,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:44,200 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:44,200 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:44,200 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:44,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:44,200 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:44,210 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:55:44,210 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:55:44,271 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:55:44,272 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:44,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:44,399 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-22 15:55:44,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:44,529 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-22 15:55:44,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:44,551 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:44,567 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:55:44,567 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:55:44,673 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:55:44,673 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:44,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:44,689 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-22 15:55:44,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:44,764 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-22 15:55:44,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:44,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 13 [2018-10-22 15:55:44,766 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:44,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-22 15:55:44,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-22 15:55:44,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:55:44,768 INFO L87 Difference]: Start difference. First operand 150 states and 200 transitions. Second operand 8 states. [2018-10-22 15:55:44,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:44,933 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2018-10-22 15:55:44,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 15:55:44,934 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2018-10-22 15:55:44,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:44,936 INFO L225 Difference]: With dead ends: 375 [2018-10-22 15:55:44,936 INFO L226 Difference]: Without dead ends: 245 [2018-10-22 15:55:44,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-22 15:55:44,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-22 15:55:44,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 176. [2018-10-22 15:55:44,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-22 15:55:44,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 236 transitions. [2018-10-22 15:55:44,961 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 236 transitions. Word has length 75 [2018-10-22 15:55:44,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:44,961 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 236 transitions. [2018-10-22 15:55:44,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-22 15:55:44,962 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 236 transitions. [2018-10-22 15:55:44,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-22 15:55:44,964 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:44,964 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:44,965 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:44,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:44,965 INFO L82 PathProgramCache]: Analyzing trace with hash -2053819268, now seen corresponding path program 5 times [2018-10-22 15:55:44,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:44,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:44,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:44,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:44,967 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:44,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:45,133 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 15:55:45,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:45,134 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:45,134 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:45,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:45,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:45,135 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:45,144 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:55:45,144 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:45,215 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:55:45,215 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:45,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:45,247 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 15:55:45,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:45,389 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 15:55:45,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:45,411 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:45,427 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:55:45,427 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:45,648 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 15:55:45,648 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:45,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:45,667 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 15:55:45,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:45,714 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-22 15:55:45,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:45,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-10-22 15:55:45,717 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:45,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 15:55:45,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 15:55:45,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:55:45,718 INFO L87 Difference]: Start difference. First operand 176 states and 236 transitions. Second operand 9 states. [2018-10-22 15:55:46,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:46,091 INFO L93 Difference]: Finished difference Result 424 states and 587 transitions. [2018-10-22 15:55:46,091 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 15:55:46,092 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 85 [2018-10-22 15:55:46,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:46,094 INFO L225 Difference]: With dead ends: 424 [2018-10-22 15:55:46,094 INFO L226 Difference]: Without dead ends: 271 [2018-10-22 15:55:46,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 15:55:46,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2018-10-22 15:55:46,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 202. [2018-10-22 15:55:46,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-22 15:55:46,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 272 transitions. [2018-10-22 15:55:46,120 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 272 transitions. Word has length 85 [2018-10-22 15:55:46,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:46,121 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 272 transitions. [2018-10-22 15:55:46,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 15:55:46,121 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 272 transitions. [2018-10-22 15:55:46,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-22 15:55:46,124 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:46,124 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:46,125 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:46,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:46,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1431295078, now seen corresponding path program 6 times [2018-10-22 15:55:46,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:46,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:46,126 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:46,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:46,127 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-22 15:55:46,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:46,346 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:46,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:46,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:46,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:46,346 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:46,370 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:55:46,370 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:55:46,448 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:55:46,448 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:46,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:46,469 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-22 15:55:46,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:46,730 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-22 15:55:46,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:46,751 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:46,769 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:55:46,770 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:55:47,139 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 15:55:47,140 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:47,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:47,159 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-22 15:55:47,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:47,295 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-22 15:55:47,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:47,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-10-22 15:55:47,298 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:47,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 15:55:47,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 15:55:47,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:55:47,299 INFO L87 Difference]: Start difference. First operand 202 states and 272 transitions. Second operand 10 states. [2018-10-22 15:55:47,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:47,716 INFO L93 Difference]: Finished difference Result 473 states and 656 transitions. [2018-10-22 15:55:47,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 15:55:47,721 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 95 [2018-10-22 15:55:47,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:47,723 INFO L225 Difference]: With dead ends: 473 [2018-10-22 15:55:47,724 INFO L226 Difference]: Without dead ends: 297 [2018-10-22 15:55:47,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 15:55:47,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-22 15:55:47,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 228. [2018-10-22 15:55:47,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2018-10-22 15:55:47,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 308 transitions. [2018-10-22 15:55:47,747 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 308 transitions. Word has length 95 [2018-10-22 15:55:47,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:47,747 INFO L481 AbstractCegarLoop]: Abstraction has 228 states and 308 transitions. [2018-10-22 15:55:47,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 15:55:47,748 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 308 transitions. [2018-10-22 15:55:47,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-22 15:55:47,750 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:47,750 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:47,750 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:47,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:47,751 INFO L82 PathProgramCache]: Analyzing trace with hash -336918916, now seen corresponding path program 7 times [2018-10-22 15:55:47,751 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:47,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:47,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:47,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:47,752 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:47,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:47,953 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 15:55:47,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:47,953 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:47,953 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:47,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:47,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:47,953 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:47,961 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:47,962 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:48,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:48,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:48,080 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 15:55:48,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:48,314 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 15:55:48,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:48,336 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:48,352 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:48,352 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:55:48,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:48,477 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:48,488 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 15:55:48,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:48,526 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-10-22 15:55:48,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:48,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-10-22 15:55:48,529 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:48,530 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 15:55:48,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 15:55:48,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:55:48,531 INFO L87 Difference]: Start difference. First operand 228 states and 308 transitions. Second operand 11 states. [2018-10-22 15:55:48,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:48,818 INFO L93 Difference]: Finished difference Result 522 states and 725 transitions. [2018-10-22 15:55:48,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 15:55:48,819 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 105 [2018-10-22 15:55:48,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:48,822 INFO L225 Difference]: With dead ends: 522 [2018-10-22 15:55:48,822 INFO L226 Difference]: Without dead ends: 323 [2018-10-22 15:55:48,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 15:55:48,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2018-10-22 15:55:48,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 254. [2018-10-22 15:55:48,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2018-10-22 15:55:48,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 344 transitions. [2018-10-22 15:55:48,852 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 344 transitions. Word has length 105 [2018-10-22 15:55:48,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:48,852 INFO L481 AbstractCegarLoop]: Abstraction has 254 states and 344 transitions. [2018-10-22 15:55:48,852 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 15:55:48,852 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 344 transitions. [2018-10-22 15:55:48,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-22 15:55:48,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:48,854 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 8, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:48,855 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:48,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:48,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1596045030, now seen corresponding path program 8 times [2018-10-22 15:55:48,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:48,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:48,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:55:48,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:48,859 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:48,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:49,101 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2018-10-22 15:55:49,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:49,102 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:49,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:49,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:49,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:49,102 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:49,110 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:55:49,110 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:49,190 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:55:49,190 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:49,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:49,230 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2018-10-22 15:55:49,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:49,597 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2018-10-22 15:55:49,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:49,619 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:49,647 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:55:49,647 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:49,815 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:55:49,815 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:49,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:49,834 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2018-10-22 15:55:49,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:49,868 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2018-10-22 15:55:49,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:49,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 21 [2018-10-22 15:55:49,874 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:49,875 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 15:55:49,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 15:55:49,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:55:49,876 INFO L87 Difference]: Start difference. First operand 254 states and 344 transitions. Second operand 12 states. [2018-10-22 15:55:50,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:50,643 INFO L93 Difference]: Finished difference Result 571 states and 794 transitions. [2018-10-22 15:55:50,643 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 15:55:50,643 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 115 [2018-10-22 15:55:50,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:50,646 INFO L225 Difference]: With dead ends: 571 [2018-10-22 15:55:50,646 INFO L226 Difference]: Without dead ends: 349 [2018-10-22 15:55:50,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 15:55:50,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-10-22 15:55:50,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 280. [2018-10-22 15:55:50,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-22 15:55:50,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 380 transitions. [2018-10-22 15:55:50,673 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 380 transitions. Word has length 115 [2018-10-22 15:55:50,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:50,674 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 380 transitions. [2018-10-22 15:55:50,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 15:55:50,674 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 380 transitions. [2018-10-22 15:55:50,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-22 15:55:50,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:50,677 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 9, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:50,677 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:50,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:50,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1910011780, now seen corresponding path program 9 times [2018-10-22 15:55:50,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:50,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:50,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:50,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:50,678 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:50,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2018-10-22 15:55:51,088 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:51,088 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:51,089 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:51,089 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:51,089 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:51,089 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:51,098 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:55:51,098 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:55:51,144 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:55:51,145 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:51,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:51,240 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 74 proven. 11 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2018-10-22 15:55:51,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 74 proven. 11 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2018-10-22 15:55:51,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:51,400 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:51,418 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:55:51,419 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:55:51,606 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 15:55:51,606 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:51,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:51,717 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 74 proven. 11 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2018-10-22 15:55:51,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:51,769 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 74 proven. 11 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2018-10-22 15:55:51,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:51,772 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8, 9, 9] total 31 [2018-10-22 15:55:51,772 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:51,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 15:55:51,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 15:55:51,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=774, Unknown=0, NotChecked=0, Total=930 [2018-10-22 15:55:51,773 INFO L87 Difference]: Start difference. First operand 280 states and 380 transitions. Second operand 18 states. [2018-10-22 15:55:53,728 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-22 15:55:56,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:56,071 INFO L93 Difference]: Finished difference Result 1283 states and 1825 transitions. [2018-10-22 15:55:56,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-22 15:55:56,072 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 125 [2018-10-22 15:55:56,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:56,079 INFO L225 Difference]: With dead ends: 1283 [2018-10-22 15:55:56,079 INFO L226 Difference]: Without dead ends: 1035 [2018-10-22 15:55:56,082 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 514 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1372, Invalid=4030, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 15:55:56,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2018-10-22 15:55:56,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 324. [2018-10-22 15:55:56,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2018-10-22 15:55:56,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 444 transitions. [2018-10-22 15:55:56,127 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 444 transitions. Word has length 125 [2018-10-22 15:55:56,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:56,128 INFO L481 AbstractCegarLoop]: Abstraction has 324 states and 444 transitions. [2018-10-22 15:55:56,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 15:55:56,128 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 444 transitions. [2018-10-22 15:55:56,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-10-22 15:55:56,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:56,131 INFO L375 BasicCegarLoop]: trace histogram [13, 11, 11, 10, 10, 10, 10, 10, 10, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:56,131 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:56,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:56,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1574829575, now seen corresponding path program 10 times [2018-10-22 15:55:56,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:56,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:56,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:56,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:56,133 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:56,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:56,868 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2018-10-22 15:55:56,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:56,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:56,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:56,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:56,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:56,870 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:56,885 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:55:56,885 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:55:56,970 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:55:56,971 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:56,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:57,007 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2018-10-22 15:55:57,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:57,196 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2018-10-22 15:55:57,217 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:57,217 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:57,234 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:55:57,234 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:55:57,426 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:55:57,427 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:57,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:57,454 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2018-10-22 15:55:57,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:57,515 INFO L134 CoverageAnalysis]: Checked inductivity of 580 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2018-10-22 15:55:57,516 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:55:57,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 25 [2018-10-22 15:55:57,517 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:55:57,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 15:55:57,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 15:55:57,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:55:57,518 INFO L87 Difference]: Start difference. First operand 324 states and 444 transitions. Second operand 14 states. [2018-10-22 15:55:57,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:55:57,850 INFO L93 Difference]: Finished difference Result 741 states and 1044 transitions. [2018-10-22 15:55:57,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 15:55:57,850 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 145 [2018-10-22 15:55:57,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:55:57,855 INFO L225 Difference]: With dead ends: 741 [2018-10-22 15:55:57,855 INFO L226 Difference]: Without dead ends: 455 [2018-10-22 15:55:57,856 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-22 15:55:57,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2018-10-22 15:55:57,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 350. [2018-10-22 15:55:57,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2018-10-22 15:55:57,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 480 transitions. [2018-10-22 15:55:57,896 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 480 transitions. Word has length 145 [2018-10-22 15:55:57,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:55:57,896 INFO L481 AbstractCegarLoop]: Abstraction has 350 states and 480 transitions. [2018-10-22 15:55:57,897 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 15:55:57,897 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 480 transitions. [2018-10-22 15:55:57,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-22 15:55:57,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:55:57,899 INFO L375 BasicCegarLoop]: trace histogram [14, 12, 12, 11, 11, 11, 11, 11, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:55:57,900 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:55:57,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:55:57,900 INFO L82 PathProgramCache]: Analyzing trace with hash 364760937, now seen corresponding path program 11 times [2018-10-22 15:55:57,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:55:57,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:57,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:55:57,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:55:57,901 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:55:57,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:55:58,122 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2018-10-22 15:55:58,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:58,122 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:55:58,123 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:55:58,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:55:58,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:58,123 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:55:58,130 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:55:58,130 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:55:58,326 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:55:58,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:55:58,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:55:58,361 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 467 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2018-10-22 15:55:58,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:55:58,663 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 467 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2018-10-22 15:55:58,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:55:58,684 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:55:58,699 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:55:58,699 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:02,324 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-22 15:56:02,324 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:02,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:02,356 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2018-10-22 15:56:02,357 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:02,399 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2018-10-22 15:56:02,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:02,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 27 [2018-10-22 15:56:02,403 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:02,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 15:56:02,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 15:56:02,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 15:56:02,405 INFO L87 Difference]: Start difference. First operand 350 states and 480 transitions. Second operand 15 states. [2018-10-22 15:56:03,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:03,476 INFO L93 Difference]: Finished difference Result 790 states and 1113 transitions. [2018-10-22 15:56:03,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 15:56:03,477 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 155 [2018-10-22 15:56:03,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:03,480 INFO L225 Difference]: With dead ends: 790 [2018-10-22 15:56:03,480 INFO L226 Difference]: Without dead ends: 481 [2018-10-22 15:56:03,483 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 15:56:03,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2018-10-22 15:56:03,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 376. [2018-10-22 15:56:03,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 376 states. [2018-10-22 15:56:03,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 516 transitions. [2018-10-22 15:56:03,530 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 516 transitions. Word has length 155 [2018-10-22 15:56:03,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:03,530 INFO L481 AbstractCegarLoop]: Abstraction has 376 states and 516 transitions. [2018-10-22 15:56:03,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 15:56:03,530 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 516 transitions. [2018-10-22 15:56:03,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-22 15:56:03,533 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:03,533 INFO L375 BasicCegarLoop]: trace histogram [15, 13, 13, 12, 12, 12, 12, 12, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:03,534 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:03,534 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:03,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1133140871, now seen corresponding path program 12 times [2018-10-22 15:56:03,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:03,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:03,535 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:03,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:03,535 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:03,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:03,771 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 588 trivial. 0 not checked. [2018-10-22 15:56:03,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:03,771 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:03,772 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:03,772 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:03,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:03,772 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:03,780 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:56:03,780 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:56:03,911 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 15:56:03,911 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:03,916 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:05,302 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 123 proven. 27 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-10-22 15:56:05,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:05,514 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 123 proven. 27 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-10-22 15:56:05,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:05,536 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:05,552 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:56:05,552 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:56:06,099 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 15:56:06,099 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:06,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:06,277 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 123 proven. 27 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-10-22 15:56:06,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:06,450 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 123 proven. 27 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-10-22 15:56:06,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:06,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9, 9, 10, 10] total 38 [2018-10-22 15:56:06,452 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:06,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 15:56:06,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 15:56:06,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1177, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 15:56:06,454 INFO L87 Difference]: Start difference. First operand 376 states and 516 transitions. Second operand 22 states. [2018-10-22 15:56:11,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:11,449 INFO L93 Difference]: Finished difference Result 1954 states and 2796 transitions. [2018-10-22 15:56:11,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-10-22 15:56:11,450 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 165 [2018-10-22 15:56:11,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:11,459 INFO L225 Difference]: With dead ends: 1954 [2018-10-22 15:56:11,460 INFO L226 Difference]: Without dead ends: 1619 [2018-10-22 15:56:11,465 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 693 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2965, Invalid=8377, Unknown=0, NotChecked=0, Total=11342 [2018-10-22 15:56:11,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1619 states. [2018-10-22 15:56:11,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1619 to 420. [2018-10-22 15:56:11,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 420 states. [2018-10-22 15:56:11,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 580 transitions. [2018-10-22 15:56:11,537 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 580 transitions. Word has length 165 [2018-10-22 15:56:11,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:11,537 INFO L481 AbstractCegarLoop]: Abstraction has 420 states and 580 transitions. [2018-10-22 15:56:11,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 15:56:11,538 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 580 transitions. [2018-10-22 15:56:11,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-22 15:56:11,540 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:11,540 INFO L375 BasicCegarLoop]: trace histogram [17, 14, 14, 13, 13, 13, 13, 13, 13, 13, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:11,541 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:11,541 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:11,541 INFO L82 PathProgramCache]: Analyzing trace with hash -192003562, now seen corresponding path program 13 times [2018-10-22 15:56:11,541 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:11,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:11,542 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:11,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:11,542 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:11,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:12,482 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2018-10-22 15:56:12,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:12,482 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:12,483 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:12,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:12,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:12,483 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:12,491 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:12,491 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:12,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:12,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:12,626 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2018-10-22 15:56:12,627 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:13,112 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2018-10-22 15:56:13,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:13,134 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:13,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:13,150 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:13,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:13,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:13,401 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2018-10-22 15:56:13,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:13,634 INFO L134 CoverageAnalysis]: Checked inductivity of 996 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 736 trivial. 0 not checked. [2018-10-22 15:56:13,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:13,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 31 [2018-10-22 15:56:13,640 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:13,640 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 15:56:13,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 15:56:13,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 15:56:13,641 INFO L87 Difference]: Start difference. First operand 420 states and 580 transitions. Second operand 17 states. [2018-10-22 15:56:14,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:14,176 INFO L93 Difference]: Finished difference Result 960 states and 1363 transitions. [2018-10-22 15:56:14,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 15:56:14,176 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 185 [2018-10-22 15:56:14,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:14,179 INFO L225 Difference]: With dead ends: 960 [2018-10-22 15:56:14,179 INFO L226 Difference]: Without dead ends: 587 [2018-10-22 15:56:14,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 754 GetRequests, 725 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 15:56:14,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2018-10-22 15:56:14,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 446. [2018-10-22 15:56:14,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 446 states. [2018-10-22 15:56:14,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 616 transitions. [2018-10-22 15:56:14,251 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 616 transitions. Word has length 185 [2018-10-22 15:56:14,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:14,253 INFO L481 AbstractCegarLoop]: Abstraction has 446 states and 616 transitions. [2018-10-22 15:56:14,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 15:56:14,253 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 616 transitions. [2018-10-22 15:56:14,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-22 15:56:14,255 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:14,256 INFO L375 BasicCegarLoop]: trace histogram [18, 15, 15, 14, 14, 14, 14, 14, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:14,256 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:14,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:14,256 INFO L82 PathProgramCache]: Analyzing trace with hash 609086516, now seen corresponding path program 14 times [2018-10-22 15:56:14,256 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:14,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:14,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:14,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:14,258 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:14,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:15,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1138 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 837 trivial. 0 not checked. [2018-10-22 15:56:15,124 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:15,124 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:15,125 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:15,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:15,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:15,125 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:15,132 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:15,132 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:15,238 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:15,239 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:15,243 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:15,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1138 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 837 trivial. 0 not checked. [2018-10-22 15:56:15,270 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:15,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1138 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 837 trivial. 0 not checked. [2018-10-22 15:56:15,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:15,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:15,830 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:15,830 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:16,090 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:16,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:16,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:16,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1138 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 837 trivial. 0 not checked. [2018-10-22 15:56:16,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1138 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 837 trivial. 0 not checked. [2018-10-22 15:56:16,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:16,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 33 [2018-10-22 15:56:16,288 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:16,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 15:56:16,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 15:56:16,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 15:56:16,290 INFO L87 Difference]: Start difference. First operand 446 states and 616 transitions. Second operand 18 states. [2018-10-22 15:56:17,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:17,076 INFO L93 Difference]: Finished difference Result 1009 states and 1432 transitions. [2018-10-22 15:56:17,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 15:56:17,077 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 195 [2018-10-22 15:56:17,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:17,081 INFO L225 Difference]: With dead ends: 1009 [2018-10-22 15:56:17,081 INFO L226 Difference]: Without dead ends: 613 [2018-10-22 15:56:17,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 795 GetRequests, 764 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 15:56:17,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2018-10-22 15:56:17,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 472. [2018-10-22 15:56:17,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 472 states. [2018-10-22 15:56:17,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 652 transitions. [2018-10-22 15:56:17,159 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 652 transitions. Word has length 195 [2018-10-22 15:56:17,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:17,160 INFO L481 AbstractCegarLoop]: Abstraction has 472 states and 652 transitions. [2018-10-22 15:56:17,160 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 15:56:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 652 transitions. [2018-10-22 15:56:17,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-22 15:56:17,162 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:17,162 INFO L375 BasicCegarLoop]: trace histogram [19, 16, 16, 15, 15, 15, 15, 15, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:17,163 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:17,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:17,163 INFO L82 PathProgramCache]: Analyzing trace with hash -805710826, now seen corresponding path program 15 times [2018-10-22 15:56:17,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:17,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:17,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:17,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:17,164 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:17,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:17,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 945 trivial. 0 not checked. [2018-10-22 15:56:17,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:17,778 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:17,779 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:17,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:17,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:17,779 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:17,786 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:56:17,786 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:56:17,862 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 15:56:17,862 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:17,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:18,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 184 proven. 50 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2018-10-22 15:56:18,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:18,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 184 proven. 50 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2018-10-22 15:56:18,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:18,316 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:18,333 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:56:18,334 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:56:18,688 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 15:56:18,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:18,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:18,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 184 proven. 50 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2018-10-22 15:56:18,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:18,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1290 backedges. 184 proven. 50 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2018-10-22 15:56:18,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:18,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10, 10, 9, 9] total 43 [2018-10-22 15:56:18,975 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:18,975 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 15:56:18,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 15:56:18,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1514, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 15:56:18,977 INFO L87 Difference]: Start difference. First operand 472 states and 652 transitions. Second operand 26 states. [2018-10-22 15:56:26,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:26,544 INFO L93 Difference]: Finished difference Result 2757 states and 3959 transitions. [2018-10-22 15:56:26,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-10-22 15:56:26,545 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 205 [2018-10-22 15:56:26,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:26,555 INFO L225 Difference]: With dead ends: 2757 [2018-10-22 15:56:26,555 INFO L226 Difference]: Without dead ends: 2335 [2018-10-22 15:56:26,564 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1022 GetRequests, 880 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6122 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5600, Invalid=14992, Unknown=0, NotChecked=0, Total=20592 [2018-10-22 15:56:26,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2335 states. [2018-10-22 15:56:26,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2335 to 516. [2018-10-22 15:56:26,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 516 states. [2018-10-22 15:56:26,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 716 transitions. [2018-10-22 15:56:26,691 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 716 transitions. Word has length 205 [2018-10-22 15:56:26,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:26,692 INFO L481 AbstractCegarLoop]: Abstraction has 516 states and 716 transitions. [2018-10-22 15:56:26,692 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 15:56:26,692 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 716 transitions. [2018-10-22 15:56:26,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-22 15:56:26,696 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:26,696 INFO L375 BasicCegarLoop]: trace histogram [21, 17, 17, 16, 16, 16, 16, 16, 16, 16, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:26,696 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:26,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:26,697 INFO L82 PathProgramCache]: Analyzing trace with hash -383780703, now seen corresponding path program 16 times [2018-10-22 15:56:26,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:26,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:26,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:26,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:26,699 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:26,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:27,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1524 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2018-10-22 15:56:27,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:27,697 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:27,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:27,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:27,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:27,697 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:27,749 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:56:27,749 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:56:27,864 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:56:27,865 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:27,870 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:27,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1524 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2018-10-22 15:56:27,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:28,337 INFO L134 CoverageAnalysis]: Checked inductivity of 1524 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2018-10-22 15:56:28,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:28,361 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:28,378 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:56:28,378 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:56:28,671 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:56:28,672 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:28,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:28,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1524 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2018-10-22 15:56:28,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:28,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1524 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2018-10-22 15:56:28,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:28,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 37 [2018-10-22 15:56:28,795 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:28,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 15:56:28,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 15:56:28,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 15:56:28,797 INFO L87 Difference]: Start difference. First operand 516 states and 716 transitions. Second operand 20 states. [2018-10-22 15:56:29,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:29,454 INFO L93 Difference]: Finished difference Result 1179 states and 1682 transitions. [2018-10-22 15:56:29,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 15:56:29,455 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 225 [2018-10-22 15:56:29,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:29,459 INFO L225 Difference]: With dead ends: 1179 [2018-10-22 15:56:29,459 INFO L226 Difference]: Without dead ends: 719 [2018-10-22 15:56:29,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 917 GetRequests, 882 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 15:56:29,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2018-10-22 15:56:29,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 542. [2018-10-22 15:56:29,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 542 states. [2018-10-22 15:56:29,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 752 transitions. [2018-10-22 15:56:29,567 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 752 transitions. Word has length 225 [2018-10-22 15:56:29,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:29,567 INFO L481 AbstractCegarLoop]: Abstraction has 542 states and 752 transitions. [2018-10-22 15:56:29,567 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 15:56:29,568 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 752 transitions. [2018-10-22 15:56:29,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-10-22 15:56:29,571 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:29,571 INFO L375 BasicCegarLoop]: trace histogram [22, 18, 18, 17, 17, 17, 17, 17, 17, 17, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:29,571 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:29,572 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:29,572 INFO L82 PathProgramCache]: Analyzing trace with hash -937364861, now seen corresponding path program 17 times [2018-10-22 15:56:29,572 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:29,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:29,573 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:29,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:29,573 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:29,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:30,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1698 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1256 trivial. 0 not checked. [2018-10-22 15:56:30,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:30,300 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:30,300 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:30,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:30,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:30,300 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:30,309 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:56:30,309 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:31,228 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 15:56:31,228 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:31,237 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:31,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1698 backedges. 0 proven. 1146 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2018-10-22 15:56:31,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:31,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1698 backedges. 0 proven. 1146 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2018-10-22 15:56:31,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:31,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:31,831 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:56:31,832 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:33,777 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-22 15:56:33,778 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:33,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:33,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1698 backedges. 0 proven. 1146 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2018-10-22 15:56:33,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1698 backedges. 0 proven. 1146 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (37)] Exception during sending of exit command (exit): Broken pipe [2018-10-22 15:56:33,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:33,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 39 [2018-10-22 15:56:33,986 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:33,987 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 15:56:33,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 15:56:33,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 15:56:33,989 INFO L87 Difference]: Start difference. First operand 542 states and 752 transitions. Second operand 21 states. [2018-10-22 15:56:34,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:34,762 INFO L93 Difference]: Finished difference Result 1228 states and 1751 transitions. [2018-10-22 15:56:34,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 15:56:34,762 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 235 [2018-10-22 15:56:34,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:34,768 INFO L225 Difference]: With dead ends: 1228 [2018-10-22 15:56:34,768 INFO L226 Difference]: Without dead ends: 745 [2018-10-22 15:56:34,772 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 921 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 15:56:34,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2018-10-22 15:56:34,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 568. [2018-10-22 15:56:34,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 568 states. [2018-10-22 15:56:34,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 568 states to 568 states and 788 transitions. [2018-10-22 15:56:34,908 INFO L78 Accepts]: Start accepts. Automaton has 568 states and 788 transitions. Word has length 235 [2018-10-22 15:56:34,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:34,909 INFO L481 AbstractCegarLoop]: Abstraction has 568 states and 788 transitions. [2018-10-22 15:56:34,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 15:56:34,909 INFO L276 IsEmpty]: Start isEmpty. Operand 568 states and 788 transitions. [2018-10-22 15:56:34,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-22 15:56:34,912 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:34,912 INFO L375 BasicCegarLoop]: trace histogram [23, 19, 19, 18, 18, 18, 18, 18, 18, 18, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:34,913 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:34,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:34,913 INFO L82 PathProgramCache]: Analyzing trace with hash -942651871, now seen corresponding path program 18 times [2018-10-22 15:56:34,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:34,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:34,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:34,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:34,914 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:34,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:35,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1882 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 1387 trivial. 0 not checked. [2018-10-22 15:56:35,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:35,696 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:35,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:35,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:35,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:35,697 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:35,706 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:56:35,706 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:56:35,999 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:56:35,999 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:36,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:36,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1882 backedges. 257 proven. 80 refuted. 0 times theorem prover too weak. 1545 trivial. 0 not checked. [2018-10-22 15:56:36,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:37,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1882 backedges. 257 proven. 80 refuted. 0 times theorem prover too weak. 1545 trivial. 0 not checked. [2018-10-22 15:56:38,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:38,000 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:38,017 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:56:38,018 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:56:39,318 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-22 15:56:39,319 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:39,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:39,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1882 backedges. 257 proven. 80 refuted. 0 times theorem prover too weak. 1545 trivial. 0 not checked. [2018-10-22 15:56:39,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:39,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1882 backedges. 257 proven. 80 refuted. 0 times theorem prover too weak. 1545 trivial. 0 not checked. [2018-10-22 15:56:39,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:39,720 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 11, 11, 12, 12] total 52 [2018-10-22 15:56:39,720 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:39,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 15:56:39,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 15:56:39,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2232, Unknown=0, NotChecked=0, Total=2652 [2018-10-22 15:56:39,723 INFO L87 Difference]: Start difference. First operand 568 states and 788 transitions. Second operand 30 states. [2018-10-22 15:56:50,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:50,478 INFO L93 Difference]: Finished difference Result 3692 states and 5314 transitions. [2018-10-22 15:56:50,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2018-10-22 15:56:50,478 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 245 [2018-10-22 15:56:50,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:50,495 INFO L225 Difference]: With dead ends: 3692 [2018-10-22 15:56:50,495 INFO L226 Difference]: Without dead ends: 3183 [2018-10-22 15:56:50,500 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1258 GetRequests, 1069 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12086 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=9736, Invalid=26554, Unknown=0, NotChecked=0, Total=36290 [2018-10-22 15:56:50,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3183 states. [2018-10-22 15:56:50,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3183 to 612. [2018-10-22 15:56:50,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 612 states. [2018-10-22 15:56:50,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 612 states to 612 states and 852 transitions. [2018-10-22 15:56:50,690 INFO L78 Accepts]: Start accepts. Automaton has 612 states and 852 transitions. Word has length 245 [2018-10-22 15:56:50,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:50,690 INFO L481 AbstractCegarLoop]: Abstraction has 612 states and 852 transitions. [2018-10-22 15:56:50,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 15:56:50,690 INFO L276 IsEmpty]: Start isEmpty. Operand 612 states and 852 transitions. [2018-10-22 15:56:50,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2018-10-22 15:56:50,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:50,694 INFO L375 BasicCegarLoop]: trace histogram [25, 20, 20, 19, 19, 19, 19, 19, 19, 19, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:50,694 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:50,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:50,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1544889168, now seen corresponding path program 19 times [2018-10-22 15:56:50,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:50,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:50,696 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:50,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:50,696 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:50,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:51,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2164 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1613 trivial. 0 not checked. [2018-10-22 15:56:51,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:51,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:51,822 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:51,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:51,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:51,822 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:51,830 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:51,830 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:51,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:51,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:52,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2164 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1613 trivial. 0 not checked. [2018-10-22 15:56:52,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:52,593 INFO L134 CoverageAnalysis]: Checked inductivity of 2164 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1613 trivial. 0 not checked. [2018-10-22 15:56:52,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:52,616 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:52,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:52,635 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:56:52,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:52,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:53,023 INFO L134 CoverageAnalysis]: Checked inductivity of 2164 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1613 trivial. 0 not checked. [2018-10-22 15:56:53,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:53,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2164 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1613 trivial. 0 not checked. [2018-10-22 15:56:53,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:53,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 43 [2018-10-22 15:56:53,102 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:53,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 15:56:53,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 15:56:53,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 15:56:53,104 INFO L87 Difference]: Start difference. First operand 612 states and 852 transitions. Second operand 23 states. [2018-10-22 15:56:54,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:54,138 INFO L93 Difference]: Finished difference Result 1398 states and 2001 transitions. [2018-10-22 15:56:54,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 15:56:54,142 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 265 [2018-10-22 15:56:54,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:54,146 INFO L225 Difference]: With dead ends: 1398 [2018-10-22 15:56:54,147 INFO L226 Difference]: Without dead ends: 851 [2018-10-22 15:56:54,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1039 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 15:56:54,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 851 states. [2018-10-22 15:56:54,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 851 to 638. [2018-10-22 15:56:54,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 638 states. [2018-10-22 15:56:54,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 638 states to 638 states and 888 transitions. [2018-10-22 15:56:54,305 INFO L78 Accepts]: Start accepts. Automaton has 638 states and 888 transitions. Word has length 265 [2018-10-22 15:56:54,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:54,305 INFO L481 AbstractCegarLoop]: Abstraction has 638 states and 888 transitions. [2018-10-22 15:56:54,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 15:56:54,306 INFO L276 IsEmpty]: Start isEmpty. Operand 638 states and 888 transitions. [2018-10-22 15:56:54,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-22 15:56:54,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:54,310 INFO L375 BasicCegarLoop]: trace histogram [26, 21, 21, 20, 20, 20, 20, 20, 20, 20, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:54,310 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:54,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:54,311 INFO L82 PathProgramCache]: Analyzing trace with hash 396283470, now seen corresponding path program 20 times [2018-10-22 15:56:54,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:54,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:54,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:56:54,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:54,312 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:54,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:54,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2370 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2018-10-22 15:56:54,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:54,729 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:54,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:54,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:54,730 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:54,730 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:54,740 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:54,740 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:54,891 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:54,891 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:54,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2370 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2018-10-22 15:56:55,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:56,206 INFO L134 CoverageAnalysis]: Checked inductivity of 2370 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2018-10-22 15:56:56,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:56,234 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:56,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:56:56,252 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:56:56,630 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:56:56,631 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:56,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:56,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2370 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2018-10-22 15:56:56,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:56,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2370 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2018-10-22 15:56:56,816 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:56:56,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 45 [2018-10-22 15:56:56,817 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:56:56,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 15:56:56,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 15:56:56,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 15:56:56,819 INFO L87 Difference]: Start difference. First operand 638 states and 888 transitions. Second operand 24 states. [2018-10-22 15:56:57,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:56:57,605 INFO L93 Difference]: Finished difference Result 1447 states and 2070 transitions. [2018-10-22 15:56:57,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 15:56:57,605 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-10-22 15:56:57,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:56:57,610 INFO L225 Difference]: With dead ends: 1447 [2018-10-22 15:56:57,610 INFO L226 Difference]: Without dead ends: 877 [2018-10-22 15:56:57,613 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1121 GetRequests, 1078 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 15:56:57,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 877 states. [2018-10-22 15:56:57,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 877 to 664. [2018-10-22 15:56:57,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 664 states. [2018-10-22 15:56:57,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 664 states to 664 states and 924 transitions. [2018-10-22 15:56:57,749 INFO L78 Accepts]: Start accepts. Automaton has 664 states and 924 transitions. Word has length 275 [2018-10-22 15:56:57,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:56:57,749 INFO L481 AbstractCegarLoop]: Abstraction has 664 states and 924 transitions. [2018-10-22 15:56:57,749 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 15:56:57,749 INFO L276 IsEmpty]: Start isEmpty. Operand 664 states and 924 transitions. [2018-10-22 15:56:57,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-22 15:56:57,753 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:56:57,753 INFO L375 BasicCegarLoop]: trace histogram [27, 22, 22, 21, 21, 21, 21, 21, 21, 21, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:56:57,753 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:56:57,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:56:57,754 INFO L82 PathProgramCache]: Analyzing trace with hash 2095677104, now seen corresponding path program 21 times [2018-10-22 15:56:57,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:56:57,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:57,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:56:57,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:56:57,755 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:56:57,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:56:58,230 INFO L134 CoverageAnalysis]: Checked inductivity of 2586 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 1914 trivial. 0 not checked. [2018-10-22 15:56:58,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:58,231 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:56:58,231 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:56:58,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:56:58,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:58,231 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:56:58,239 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:56:58,239 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:56:58,388 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 15:56:58,388 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:58,393 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:56:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2586 backedges. 342 proven. 117 refuted. 0 times theorem prover too weak. 2127 trivial. 0 not checked. [2018-10-22 15:56:58,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:56:59,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2586 backedges. 342 proven. 117 refuted. 0 times theorem prover too weak. 2127 trivial. 0 not checked. [2018-10-22 15:56:59,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:56:59,065 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:56:59,092 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:56:59,093 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:56:59,745 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-22 15:56:59,745 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:56:59,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:00,025 INFO L134 CoverageAnalysis]: Checked inductivity of 2586 backedges. 342 proven. 117 refuted. 0 times theorem prover too weak. 2127 trivial. 0 not checked. [2018-10-22 15:57:00,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:00,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2586 backedges. 342 proven. 117 refuted. 0 times theorem prover too weak. 2127 trivial. 0 not checked. [2018-10-22 15:57:00,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:00,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 12, 12, 13, 13] total 59 [2018-10-22 15:57:00,407 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:00,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 15:57:00,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 15:57:00,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=2884, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 15:57:00,410 INFO L87 Difference]: Start difference. First operand 664 states and 924 transitions. Second operand 34 states. [2018-10-22 15:57:03,679 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-22 15:57:15,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:15,869 INFO L93 Difference]: Finished difference Result 4759 states and 6861 transitions. [2018-10-22 15:57:15,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 209 states. [2018-10-22 15:57:15,870 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 285 [2018-10-22 15:57:15,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:15,890 INFO L225 Difference]: With dead ends: 4759 [2018-10-22 15:57:15,890 INFO L226 Difference]: Without dead ends: 4163 [2018-10-22 15:57:15,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1506 GetRequests, 1266 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20950 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=15724, Invalid=42598, Unknown=0, NotChecked=0, Total=58322 [2018-10-22 15:57:15,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4163 states. [2018-10-22 15:57:16,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4163 to 708. [2018-10-22 15:57:16,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 708 states. [2018-10-22 15:57:16,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 708 states to 708 states and 988 transitions. [2018-10-22 15:57:16,094 INFO L78 Accepts]: Start accepts. Automaton has 708 states and 988 transitions. Word has length 285 [2018-10-22 15:57:16,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:16,095 INFO L481 AbstractCegarLoop]: Abstraction has 708 states and 988 transitions. [2018-10-22 15:57:16,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 15:57:16,095 INFO L276 IsEmpty]: Start isEmpty. Operand 708 states and 988 transitions. [2018-10-22 15:57:16,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2018-10-22 15:57:16,098 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:16,098 INFO L375 BasicCegarLoop]: trace histogram [29, 23, 23, 22, 22, 22, 22, 22, 22, 22, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:16,099 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:16,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:16,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1696363067, now seen corresponding path program 22 times [2018-10-22 15:57:16,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:16,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:16,100 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:16,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:16,100 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:16,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:16,587 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2179 trivial. 0 not checked. [2018-10-22 15:57:16,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:16,587 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:16,588 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:16,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:16,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:16,588 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:16,595 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:57:16,596 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:57:16,754 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:57:16,755 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:16,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:16,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2179 trivial. 0 not checked. [2018-10-22 15:57:16,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:18,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2179 trivial. 0 not checked. [2018-10-22 15:57:18,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:18,239 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:18,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:57:18,256 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:57:18,646 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:57:18,646 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:18,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:18,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2179 trivial. 0 not checked. [2018-10-22 15:57:18,729 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:18,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2179 trivial. 0 not checked. [2018-10-22 15:57:18,899 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:18,899 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 49 [2018-10-22 15:57:18,899 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:18,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 15:57:18,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 15:57:18,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 15:57:18,902 INFO L87 Difference]: Start difference. First operand 708 states and 988 transitions. Second operand 26 states. [2018-10-22 15:57:19,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:19,692 INFO L93 Difference]: Finished difference Result 1617 states and 2320 transitions. [2018-10-22 15:57:19,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 15:57:19,692 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 305 [2018-10-22 15:57:19,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:19,698 INFO L225 Difference]: With dead ends: 1617 [2018-10-22 15:57:19,698 INFO L226 Difference]: Without dead ends: 983 [2018-10-22 15:57:19,700 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 1196 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 15:57:19,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 983 states. [2018-10-22 15:57:19,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 983 to 734. [2018-10-22 15:57:19,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 734 states. [2018-10-22 15:57:19,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 734 states to 734 states and 1024 transitions. [2018-10-22 15:57:19,880 INFO L78 Accepts]: Start accepts. Automaton has 734 states and 1024 transitions. Word has length 305 [2018-10-22 15:57:19,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:19,880 INFO L481 AbstractCegarLoop]: Abstraction has 734 states and 1024 transitions. [2018-10-22 15:57:19,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 15:57:19,880 INFO L276 IsEmpty]: Start isEmpty. Operand 734 states and 1024 transitions. [2018-10-22 15:57:19,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-22 15:57:19,884 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:19,884 INFO L375 BasicCegarLoop]: trace histogram [30, 24, 24, 23, 23, 23, 23, 23, 23, 23, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:19,885 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:19,885 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:19,885 INFO L82 PathProgramCache]: Analyzing trace with hash -602229603, now seen corresponding path program 23 times [2018-10-22 15:57:19,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:19,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:19,886 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:19,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:19,886 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:19,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:21,495 INFO L134 CoverageAnalysis]: Checked inductivity of 3154 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2349 trivial. 0 not checked. [2018-10-22 15:57:21,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:21,496 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:21,496 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:21,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:21,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:21,496 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:21,507 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:57:21,507 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:22,753 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 15:57:22,753 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:22,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:22,848 INFO L134 CoverageAnalysis]: Checked inductivity of 3154 backedges. 0 proven. 2125 refuted. 0 times theorem prover too weak. 1029 trivial. 0 not checked. [2018-10-22 15:57:22,848 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:23,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3154 backedges. 0 proven. 2125 refuted. 0 times theorem prover too weak. 1029 trivial. 0 not checked. [2018-10-22 15:57:23,614 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:23,615 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:23,631 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:57:23,632 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:57:28,242 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-10-22 15:57:28,243 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:28,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:28,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3154 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2349 trivial. 0 not checked. [2018-10-22 15:57:28,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:28,418 INFO L134 CoverageAnalysis]: Checked inductivity of 3154 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2349 trivial. 0 not checked. [2018-10-22 15:57:28,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:28,423 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 51 [2018-10-22 15:57:28,423 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:28,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 15:57:28,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 15:57:28,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 15:57:28,425 INFO L87 Difference]: Start difference. First operand 734 states and 1024 transitions. Second operand 27 states. [2018-10-22 15:57:29,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:29,395 INFO L93 Difference]: Finished difference Result 1666 states and 2389 transitions. [2018-10-22 15:57:29,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 15:57:29,395 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 315 [2018-10-22 15:57:29,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:29,402 INFO L225 Difference]: With dead ends: 1666 [2018-10-22 15:57:29,402 INFO L226 Difference]: Without dead ends: 1009 [2018-10-22 15:57:29,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1284 GetRequests, 1235 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 15:57:29,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1009 states. [2018-10-22 15:57:29,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1009 to 760. [2018-10-22 15:57:29,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 760 states. [2018-10-22 15:57:29,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 760 states to 760 states and 1060 transitions. [2018-10-22 15:57:29,722 INFO L78 Accepts]: Start accepts. Automaton has 760 states and 1060 transitions. Word has length 315 [2018-10-22 15:57:29,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:29,723 INFO L481 AbstractCegarLoop]: Abstraction has 760 states and 1060 transitions. [2018-10-22 15:57:29,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 15:57:29,723 INFO L276 IsEmpty]: Start isEmpty. Operand 760 states and 1060 transitions. [2018-10-22 15:57:29,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-22 15:57:29,728 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:29,728 INFO L375 BasicCegarLoop]: trace histogram [31, 25, 25, 24, 24, 24, 24, 24, 24, 24, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:29,729 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:29,729 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:29,729 INFO L82 PathProgramCache]: Analyzing trace with hash -101929029, now seen corresponding path program 24 times [2018-10-22 15:57:29,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:29,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:29,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:29,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:29,731 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:29,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:31,187 INFO L134 CoverageAnalysis]: Checked inductivity of 3402 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 2526 trivial. 0 not checked. [2018-10-22 15:57:31,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:31,188 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:31,188 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:31,188 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:31,188 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:31,188 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:31,198 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:57:31,199 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:57:32,135 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 15:57:32,135 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:32,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:32,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3402 backedges. 439 proven. 161 refuted. 0 times theorem prover too weak. 2802 trivial. 0 not checked. [2018-10-22 15:57:32,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:32,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3402 backedges. 439 proven. 161 refuted. 0 times theorem prover too weak. 2802 trivial. 0 not checked. [2018-10-22 15:57:32,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:32,938 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:57:32,956 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:57:32,956 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:57:35,467 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2018-10-22 15:57:35,467 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:57:35,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:35,798 INFO L134 CoverageAnalysis]: Checked inductivity of 3402 backedges. 439 proven. 161 refuted. 0 times theorem prover too weak. 2802 trivial. 0 not checked. [2018-10-22 15:57:35,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:57:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3402 backedges. 439 proven. 161 refuted. 0 times theorem prover too weak. 2802 trivial. 0 not checked. [2018-10-22 15:57:36,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:57:36,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 13, 13, 14, 14] total 66 [2018-10-22 15:57:36,084 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:57:36,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 15:57:36,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 15:57:36,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=3619, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 15:57:36,087 INFO L87 Difference]: Start difference. First operand 760 states and 1060 transitions. Second operand 38 states. [2018-10-22 15:57:58,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:57:58,108 INFO L93 Difference]: Finished difference Result 5958 states and 8600 transitions. [2018-10-22 15:57:58,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 262 states. [2018-10-22 15:57:58,108 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 325 [2018-10-22 15:57:58,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:57:58,132 INFO L225 Difference]: With dead ends: 5958 [2018-10-22 15:57:58,132 INFO L226 Difference]: Without dead ends: 5275 [2018-10-22 15:57:58,139 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1766 GetRequests, 1453 SyntacticMatches, 16 SemanticMatches, 297 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34787 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=24077, Invalid=65025, Unknown=0, NotChecked=0, Total=89102 [2018-10-22 15:57:58,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5275 states. [2018-10-22 15:57:58,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5275 to 804. [2018-10-22 15:57:58,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 804 states. [2018-10-22 15:57:58,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 804 states to 804 states and 1124 transitions. [2018-10-22 15:57:58,387 INFO L78 Accepts]: Start accepts. Automaton has 804 states and 1124 transitions. Word has length 325 [2018-10-22 15:57:58,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:57:58,387 INFO L481 AbstractCegarLoop]: Abstraction has 804 states and 1124 transitions. [2018-10-22 15:57:58,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 15:57:58,387 INFO L276 IsEmpty]: Start isEmpty. Operand 804 states and 1124 transitions. [2018-10-22 15:57:58,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2018-10-22 15:57:58,391 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:57:58,391 INFO L375 BasicCegarLoop]: trace histogram [33, 26, 26, 25, 25, 25, 25, 25, 25, 25, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:57:58,391 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:57:58,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:57:58,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1463331254, now seen corresponding path program 25 times [2018-10-22 15:57:58,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:57:58,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:58,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:57:58,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:57:58,393 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:57:58,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:59,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3780 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2830 trivial. 0 not checked. [2018-10-22 15:57:59,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:59,522 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:57:59,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:57:59,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:57:59,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:57:59,523 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:57:59,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:57:59,532 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:57:59,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:57:59,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:57:59,782 INFO L134 CoverageAnalysis]: Checked inductivity of 3780 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2830 trivial. 0 not checked. [2018-10-22 15:57:59,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:00,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3780 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2830 trivial. 0 not checked. [2018-10-22 15:58:00,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:00,591 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:00,606 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:58:00,606 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 15:58:01,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:01,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:01,071 INFO L134 CoverageAnalysis]: Checked inductivity of 3780 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2830 trivial. 0 not checked. [2018-10-22 15:58:01,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:01,180 INFO L134 CoverageAnalysis]: Checked inductivity of 3780 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2830 trivial. 0 not checked. [2018-10-22 15:58:01,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:01,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 55 [2018-10-22 15:58:01,182 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:01,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 15:58:01,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 15:58:01,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 15:58:01,184 INFO L87 Difference]: Start difference. First operand 804 states and 1124 transitions. Second operand 29 states. [2018-10-22 15:58:02,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:02,321 INFO L93 Difference]: Finished difference Result 1836 states and 2639 transitions. [2018-10-22 15:58:02,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 15:58:02,322 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 345 [2018-10-22 15:58:02,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:02,328 INFO L225 Difference]: With dead ends: 1836 [2018-10-22 15:58:02,328 INFO L226 Difference]: Without dead ends: 1115 [2018-10-22 15:58:02,330 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1406 GetRequests, 1353 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 15:58:02,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1115 states. [2018-10-22 15:58:02,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1115 to 830. [2018-10-22 15:58:02,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 830 states. [2018-10-22 15:58:02,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 830 states to 830 states and 1160 transitions. [2018-10-22 15:58:02,597 INFO L78 Accepts]: Start accepts. Automaton has 830 states and 1160 transitions. Word has length 345 [2018-10-22 15:58:02,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:02,598 INFO L481 AbstractCegarLoop]: Abstraction has 830 states and 1160 transitions. [2018-10-22 15:58:02,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 15:58:02,598 INFO L276 IsEmpty]: Start isEmpty. Operand 830 states and 1160 transitions. [2018-10-22 15:58:02,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-10-22 15:58:02,600 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:02,600 INFO L375 BasicCegarLoop]: trace histogram [34, 27, 27, 26, 26, 26, 26, 26, 26, 26, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:02,601 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:02,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:02,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1125085032, now seen corresponding path program 26 times [2018-10-22 15:58:02,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:02,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:02,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 15:58:02,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:02,602 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:02,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:03,232 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3023 trivial. 0 not checked. [2018-10-22 15:58:03,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:03,232 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:03,232 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:03,232 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:03,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:03,233 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:58:03,240 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:58:03,240 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:58:03,422 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:58:03,422 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:03,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:03,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3023 trivial. 0 not checked. [2018-10-22 15:58:03,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:04,526 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3023 trivial. 0 not checked. [2018-10-22 15:58:04,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:04,547 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:04,563 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 15:58:04,563 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:58:05,011 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 15:58:05,011 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:05,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:05,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3023 trivial. 0 not checked. [2018-10-22 15:58:05,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:05,199 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3023 trivial. 0 not checked. [2018-10-22 15:58:05,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:05,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 57 [2018-10-22 15:58:05,202 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:05,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 15:58:05,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 15:58:05,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 15:58:05,205 INFO L87 Difference]: Start difference. First operand 830 states and 1160 transitions. Second operand 30 states. [2018-10-22 15:58:06,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:06,472 INFO L93 Difference]: Finished difference Result 1885 states and 2708 transitions. [2018-10-22 15:58:06,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 15:58:06,472 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 355 [2018-10-22 15:58:06,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:06,477 INFO L225 Difference]: With dead ends: 1885 [2018-10-22 15:58:06,477 INFO L226 Difference]: Without dead ends: 1141 [2018-10-22 15:58:06,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1447 GetRequests, 1392 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 15:58:06,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1141 states. [2018-10-22 15:58:06,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1141 to 856. [2018-10-22 15:58:06,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 856 states. [2018-10-22 15:58:06,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 856 states to 856 states and 1196 transitions. [2018-10-22 15:58:06,725 INFO L78 Accepts]: Start accepts. Automaton has 856 states and 1196 transitions. Word has length 355 [2018-10-22 15:58:06,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:06,725 INFO L481 AbstractCegarLoop]: Abstraction has 856 states and 1196 transitions. [2018-10-22 15:58:06,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 15:58:06,725 INFO L276 IsEmpty]: Start isEmpty. Operand 856 states and 1196 transitions. [2018-10-22 15:58:06,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-22 15:58:06,728 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:06,728 INFO L375 BasicCegarLoop]: trace histogram [35, 28, 28, 27, 27, 27, 27, 27, 27, 27, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:06,728 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:06,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:06,729 INFO L82 PathProgramCache]: Analyzing trace with hash 750585930, now seen corresponding path program 27 times [2018-10-22 15:58:06,729 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:06,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:06,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:06,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:06,729 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:06,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:07,307 INFO L134 CoverageAnalysis]: Checked inductivity of 4330 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 3223 trivial. 0 not checked. [2018-10-22 15:58:07,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:07,307 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:07,308 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:07,308 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:07,308 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:07,308 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:58:07,318 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:58:07,318 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:58:07,541 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:58:07,542 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:07,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:07,996 INFO L134 CoverageAnalysis]: Checked inductivity of 4330 backedges. 548 proven. 212 refuted. 0 times theorem prover too weak. 3570 trivial. 0 not checked. [2018-10-22 15:58:07,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4330 backedges. 548 proven. 212 refuted. 0 times theorem prover too weak. 3570 trivial. 0 not checked. [2018-10-22 15:58:08,603 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:08,603 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:08,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 15:58:08,657 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 15:58:09,616 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 15:58:09,616 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:09,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:09,899 INFO L134 CoverageAnalysis]: Checked inductivity of 4330 backedges. 548 proven. 212 refuted. 0 times theorem prover too weak. 3570 trivial. 0 not checked. [2018-10-22 15:58:09,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:10,244 INFO L134 CoverageAnalysis]: Checked inductivity of 4330 backedges. 548 proven. 212 refuted. 0 times theorem prover too weak. 3570 trivial. 0 not checked. [2018-10-22 15:58:10,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:10,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 14, 14, 13, 13] total 71 [2018-10-22 15:58:10,247 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:10,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 15:58:10,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 15:58:10,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=4188, Unknown=0, NotChecked=0, Total=4970 [2018-10-22 15:58:10,249 INFO L87 Difference]: Start difference. First operand 856 states and 1196 transitions. Second operand 42 states. [2018-10-22 15:58:40,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:40,118 INFO L93 Difference]: Finished difference Result 7289 states and 10531 transitions. [2018-10-22 15:58:40,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 321 states. [2018-10-22 15:58:40,118 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 365 [2018-10-22 15:58:40,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:40,134 INFO L225 Difference]: With dead ends: 7289 [2018-10-22 15:58:40,135 INFO L226 Difference]: Without dead ends: 6519 [2018-10-22 15:58:40,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2038 GetRequests, 1679 SyntacticMatches, 1 SemanticMatches, 358 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52832 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=35296, Invalid=93944, Unknown=0, NotChecked=0, Total=129240 [2018-10-22 15:58:40,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6519 states. [2018-10-22 15:58:40,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6519 to 900. [2018-10-22 15:58:40,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2018-10-22 15:58:40,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1260 transitions. [2018-10-22 15:58:40,544 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1260 transitions. Word has length 365 [2018-10-22 15:58:40,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:40,544 INFO L481 AbstractCegarLoop]: Abstraction has 900 states and 1260 transitions. [2018-10-22 15:58:40,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 15:58:40,544 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1260 transitions. [2018-10-22 15:58:40,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2018-10-22 15:58:40,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:40,548 INFO L375 BasicCegarLoop]: trace histogram [37, 29, 29, 28, 28, 28, 28, 28, 28, 28, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:40,548 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:40,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:40,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1962011349, now seen corresponding path program 28 times [2018-10-22 15:58:40,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:40,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:40,549 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:40,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:40,549 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:40,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:41,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4756 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2018-10-22 15:58:41,394 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:41,394 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:41,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:41,395 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:41,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:41,395 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:58:41,404 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:58:41,404 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:58:41,605 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:58:41,606 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:41,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:41,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4756 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2018-10-22 15:58:41,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:42,681 INFO L134 CoverageAnalysis]: Checked inductivity of 4756 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2018-10-22 15:58:42,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:42,704 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:42,791 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 15:58:42,792 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 15:58:43,292 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 15:58:43,292 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:43,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:43,422 INFO L134 CoverageAnalysis]: Checked inductivity of 4756 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2018-10-22 15:58:43,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:43,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4756 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3566 trivial. 0 not checked. [2018-10-22 15:58:43,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:43,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 61 [2018-10-22 15:58:43,790 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:43,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-22 15:58:43,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-22 15:58:43,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 15:58:43,791 INFO L87 Difference]: Start difference. First operand 900 states and 1260 transitions. Second operand 32 states. [2018-10-22 15:58:45,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:45,222 INFO L93 Difference]: Finished difference Result 2055 states and 2958 transitions. [2018-10-22 15:58:45,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 15:58:45,222 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 385 [2018-10-22 15:58:45,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:45,227 INFO L225 Difference]: With dead ends: 2055 [2018-10-22 15:58:45,227 INFO L226 Difference]: Without dead ends: 1247 [2018-10-22 15:58:45,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1569 GetRequests, 1510 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 15:58:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1247 states. [2018-10-22 15:58:45,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1247 to 926. [2018-10-22 15:58:45,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 926 states. [2018-10-22 15:58:45,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 926 states to 926 states and 1296 transitions. [2018-10-22 15:58:45,619 INFO L78 Accepts]: Start accepts. Automaton has 926 states and 1296 transitions. Word has length 385 [2018-10-22 15:58:45,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:45,619 INFO L481 AbstractCegarLoop]: Abstraction has 926 states and 1296 transitions. [2018-10-22 15:58:45,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-22 15:58:45,619 INFO L276 IsEmpty]: Start isEmpty. Operand 926 states and 1296 transitions. [2018-10-22 15:58:45,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-22 15:58:45,622 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:45,622 INFO L375 BasicCegarLoop]: trace histogram [38, 30, 30, 29, 29, 29, 29, 29, 29, 29, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:45,622 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:45,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:45,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1403939401, now seen corresponding path program 29 times [2018-10-22 15:58:45,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:45,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:45,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:45,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:45,624 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:45,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:46,244 INFO L134 CoverageAnalysis]: Checked inductivity of 5058 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3782 trivial. 0 not checked. [2018-10-22 15:58:46,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:46,244 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:46,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:46,245 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:46,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:46,245 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:58:46,254 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:58:46,254 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:58:48,492 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 15:58:48,492 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:48,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:48,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5058 backedges. 0 proven. 3404 refuted. 0 times theorem prover too weak. 1654 trivial. 0 not checked. [2018-10-22 15:58:48,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:49,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5058 backedges. 0 proven. 3404 refuted. 0 times theorem prover too weak. 1654 trivial. 0 not checked. [2018-10-22 15:58:49,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:49,852 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:58:49,868 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 15:58:49,868 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 15:58:56,688 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2018-10-22 15:58:56,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:58:56,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:58:56,811 INFO L134 CoverageAnalysis]: Checked inductivity of 5058 backedges. 0 proven. 3404 refuted. 0 times theorem prover too weak. 1654 trivial. 0 not checked. [2018-10-22 15:58:56,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:58:57,007 INFO L134 CoverageAnalysis]: Checked inductivity of 5058 backedges. 0 proven. 3404 refuted. 0 times theorem prover too weak. 1654 trivial. 0 not checked. [2018-10-22 15:58:57,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:58:57,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 63 [2018-10-22 15:58:57,010 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:58:57,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 15:58:57,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 15:58:57,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 15:58:57,012 INFO L87 Difference]: Start difference. First operand 926 states and 1296 transitions. Second operand 33 states. [2018-10-22 15:58:58,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 15:58:58,443 INFO L93 Difference]: Finished difference Result 2104 states and 3027 transitions. [2018-10-22 15:58:58,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 15:58:58,444 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 395 [2018-10-22 15:58:58,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 15:58:58,447 INFO L225 Difference]: With dead ends: 2104 [2018-10-22 15:58:58,448 INFO L226 Difference]: Without dead ends: 1273 [2018-10-22 15:58:58,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1610 GetRequests, 1549 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 15:58:58,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1273 states. [2018-10-22 15:58:58,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1273 to 952. [2018-10-22 15:58:58,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 952 states. [2018-10-22 15:58:58,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 952 states to 952 states and 1332 transitions. [2018-10-22 15:58:58,910 INFO L78 Accepts]: Start accepts. Automaton has 952 states and 1332 transitions. Word has length 395 [2018-10-22 15:58:58,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 15:58:58,911 INFO L481 AbstractCegarLoop]: Abstraction has 952 states and 1332 transitions. [2018-10-22 15:58:58,911 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 15:58:58,911 INFO L276 IsEmpty]: Start isEmpty. Operand 952 states and 1332 transitions. [2018-10-22 15:58:58,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-10-22 15:58:58,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 15:58:58,914 INFO L375 BasicCegarLoop]: trace histogram [39, 31, 31, 30, 30, 30, 30, 30, 30, 30, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 15:58:58,914 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 15:58:58,914 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 15:58:58,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1946032213, now seen corresponding path program 30 times [2018-10-22 15:58:58,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 15:58:58,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:58,915 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 15:58:58,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 15:58:58,916 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 15:58:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 15:58:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-10-22 15:58:59,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:59,678 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 15:58:59,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 15:58:59,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 15:58:59,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:58:59,678 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 15:58:59,687 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:58:59,687 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:59:01,589 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-22 15:59:01,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:01,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:02,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 669 proven. 270 refuted. 0 times theorem prover too weak. 4431 trivial. 0 not checked. [2018-10-22 15:59:02,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:02,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 669 proven. 270 refuted. 0 times theorem prover too weak. 4431 trivial. 0 not checked. [2018-10-22 15:59:02,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 15:59:02,725 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 15:59:02,740 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 15:59:02,740 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 15:59:07,440 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-22 15:59:07,441 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 15:59:07,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 15:59:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 669 proven. 270 refuted. 0 times theorem prover too weak. 4431 trivial. 0 not checked. [2018-10-22 15:59:07,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 15:59:08,282 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 669 proven. 270 refuted. 0 times theorem prover too weak. 4431 trivial. 0 not checked. [2018-10-22 15:59:08,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 15:59:08,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 15, 15, 16, 16] total 80 [2018-10-22 15:59:08,285 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 15:59:08,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-22 15:59:08,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-22 15:59:08,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=982, Invalid=5338, Unknown=0, NotChecked=0, Total=6320 [2018-10-22 15:59:08,287 INFO L87 Difference]: Start difference. First operand 952 states and 1332 transitions. Second operand 46 states. Received shutdown request... [2018-10-22 15:59:26,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 246 states. [2018-10-22 15:59:26,102 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 15:59:26,106 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 15:59:26,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 03:59:26 BoogieIcfgContainer [2018-10-22 15:59:26,106 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 15:59:26,107 INFO L168 Benchmark]: Toolchain (without parser) took 235795.21 ms. Allocated memory was 1.5 GB in the beginning and 3.7 GB in the end (delta: 2.2 GB). Free memory was 1.4 GB in the beginning and 2.6 GB in the end (delta: -1.2 GB). Peak memory consumption was 1.0 GB. Max. memory is 7.1 GB. [2018-10-22 15:59:26,108 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 15:59:26,108 INFO L168 Benchmark]: CACSL2BoogieTranslator took 476.62 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 15:59:26,109 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.41 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 15:59:26,109 INFO L168 Benchmark]: Boogie Preprocessor took 40.57 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 15:59:26,110 INFO L168 Benchmark]: RCFGBuilder took 822.83 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 716.2 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -757.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2018-10-22 15:59:26,110 INFO L168 Benchmark]: TraceAbstraction took 234398.92 ms. Allocated memory was 2.2 GB in the beginning and 3.7 GB in the end (delta: 1.5 GB). Free memory was 2.1 GB in the beginning and 2.6 GB in the end (delta: -447.2 MB). Peak memory consumption was 1.0 GB. Max. memory is 7.1 GB. [2018-10-22 15:59:26,114 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 476.62 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 51.41 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 40.57 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 822.83 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 716.2 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -757.2 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 234398.92 ms. Allocated memory was 2.2 GB in the beginning and 3.7 GB in the end (delta: 1.5 GB). Free memory was 2.1 GB in the beginning and 2.6 GB in the end (delta: -447.2 MB). Peak memory consumption was 1.0 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (952states) and FLOYD_HOARE automaton (currently 246 states, 46 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 292 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 55 locations, 1 error locations. TIMEOUT Result, 234.3s OverallTime, 33 OverallIterations, 39 TraceHistogramMax, 130.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 6245 SDtfs, 66120 SDslu, 36712 SDs, 0 SdLazy, 36307 SolverSat, 21412 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 41.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 29023 GetRequests, 26591 SyntacticMatches, 17 SemanticMatches, 2414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161675 ImplicationChecksByTransitivity, 91.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=952occurred in iteration=32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 5.7s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 4.1s AutomataMinimizationTime, 32 MinimizatonAttempts, 23500 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.9s SsaConstructionTime, 42.3s SatisfiabilityAnalysisTime, 46.6s InterpolantComputationTime, 19633 NumberOfCodeBlocks, 18093 NumberOfCodeBlocksAsserted, 461 NumberOfCheckSat, 32546 ConstructedInterpolants, 0 QuantifiedInterpolants, 16609868 SizeOfPredicates, 113 NumberOfNonLiveVariables, 44452 ConjunctsInSsa, 1002 ConjunctsInUnsatCore, 157 InterpolantComputations, 4 PerfectInterpolantSequences, 211343/280780 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown