java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i


--------------------------------------------------------------------------------


This is Ultimate 0.1.24-13a467a-m
[2019-10-15 01:36:24,605 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2019-10-15 01:36:24,607 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
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[2019-10-15 01:36:24,622 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
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[2019-10-15 01:36:24,624 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2019-10-15 01:36:24,629 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
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[2019-10-15 01:36:24,634 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2019-10-15 01:36:24,635 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2019-10-15 01:36:24,635 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2019-10-15 01:36:24,637 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2019-10-15 01:36:24,639 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2019-10-15 01:36:24,641 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2019-10-15 01:36:24,642 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2019-10-15 01:36:24,643 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2019-10-15 01:36:24,644 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2019-10-15 01:36:24,647 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2019-10-15 01:36:24,647 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
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[2019-10-15 01:36:24,648 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
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[2019-10-15 01:36:24,654 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2019-10-15 01:36:24,657 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2019-10-15 01:36:24,671 INFO  L113        SettingsManager]: Loading preferences was successful
[2019-10-15 01:36:24,672 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2019-10-15 01:36:24,673 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2019-10-15 01:36:24,673 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2019-10-15 01:36:24,673 INFO  L138        SettingsManager]:  * Use SBE=true
[2019-10-15 01:36:24,673 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * sizeof long=4
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2019-10-15 01:36:24,674 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2019-10-15 01:36:24,675 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2019-10-15 01:36:24,675 INFO  L138        SettingsManager]:  * sizeof long double=12
[2019-10-15 01:36:24,675 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2019-10-15 01:36:24,675 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2019-10-15 01:36:24,675 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2019-10-15 01:36:24,676 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2019-10-15 01:36:24,676 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2019-10-15 01:36:24,676 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2019-10-15 01:36:24,676 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2019-10-15 01:36:24,676 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2019-10-15 01:36:24,676 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2019-10-15 01:36:24,677 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2019-10-15 01:36:24,677 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2019-10-15 01:36:24,677 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2019-10-15 01:36:24,677 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2019-10-15 01:36:24,677 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2019-10-15 01:36:24,678 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK
[2019-10-15 01:36:24,948 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2019-10-15 01:36:24,961 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2019-10-15 01:36:24,964 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2019-10-15 01:36:24,966 INFO  L271        PluginConnector]: Initializing CDTParser...
[2019-10-15 01:36:24,966 INFO  L275        PluginConnector]: CDTParser initialized
[2019-10-15 01:36:24,967 INFO  L428   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i
[2019-10-15 01:36:25,026 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9065cd50f/e722a07d5bf9477d8ca4c500ac0cd386/FLAG917ffd7e3
[2019-10-15 01:36:25,479 INFO  L306              CDTParser]: Found 1 translation units.
[2019-10-15 01:36:25,480 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i
[2019-10-15 01:36:25,488 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9065cd50f/e722a07d5bf9477d8ca4c500ac0cd386/FLAG917ffd7e3
[2019-10-15 01:36:25,865 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9065cd50f/e722a07d5bf9477d8ca4c500ac0cd386
[2019-10-15 01:36:25,876 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2019-10-15 01:36:25,878 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2019-10-15 01:36:25,881 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2019-10-15 01:36:25,882 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2019-10-15 01:36:25,885 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2019-10-15 01:36:25,886 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:36:25" (1/1) ...
[2019-10-15 01:36:25,889 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1348e435 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:25, skipping insertion in model container
[2019-10-15 01:36:25,889 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:36:25" (1/1) ...
[2019-10-15 01:36:25,896 INFO  L142         MainTranslator]: Starting translation in SV-COMP mode 
[2019-10-15 01:36:25,913 INFO  L173         MainTranslator]: Built tables and reachable declarations
[2019-10-15 01:36:26,115 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2019-10-15 01:36:26,123 INFO  L188         MainTranslator]: Completed pre-run
[2019-10-15 01:36:26,141 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2019-10-15 01:36:26,154 INFO  L192         MainTranslator]: Completed translation
[2019-10-15 01:36:26,155 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26 WrapperNode
[2019-10-15 01:36:26,155 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2019-10-15 01:36:26,156 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2019-10-15 01:36:26,156 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2019-10-15 01:36:26,156 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2019-10-15 01:36:26,244 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,245 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,254 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,256 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,271 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,277 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,278 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
[2019-10-15 01:36:26,280 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2019-10-15 01:36:26,281 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2019-10-15 01:36:26,281 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2019-10-15 01:36:26,281 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2019-10-15 01:36:26,282 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (1/1) ...
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2019-10-15 01:36:26,342 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2019-10-15 01:36:26,342 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2019-10-15 01:36:26,342 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2019-10-15 01:36:26,343 INFO  L138     BoogieDeclarations]: Found implementation of procedure init
[2019-10-15 01:36:26,343 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2019-10-15 01:36:26,343 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2019-10-15 01:36:26,343 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2019-10-15 01:36:26,343 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2019-10-15 01:36:26,343 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2019-10-15 01:36:26,344 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2019-10-15 01:36:26,345 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2019-10-15 01:36:26,345 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2019-10-15 01:36:26,741 INFO  L279             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2019-10-15 01:36:26,741 INFO  L284             CfgBuilder]: Removed 3 assume(true) statements.
[2019-10-15 01:36:26,742 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:36:26 BoogieIcfgContainer
[2019-10-15 01:36:26,743 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2019-10-15 01:36:26,743 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2019-10-15 01:36:26,744 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2019-10-15 01:36:26,746 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2019-10-15 01:36:26,746 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:36:25" (1/3) ...
[2019-10-15 01:36:26,747 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb25b2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:36:26, skipping insertion in model container
[2019-10-15 01:36:26,747 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:36:26" (2/3) ...
[2019-10-15 01:36:26,747 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb25b2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:36:26, skipping insertion in model container
[2019-10-15 01:36:26,747 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:36:26" (3/3) ...
[2019-10-15 01:36:26,749 INFO  L109   eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i
[2019-10-15 01:36:26,756 INFO  L152   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2019-10-15 01:36:26,763 INFO  L164   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2019-10-15 01:36:26,772 INFO  L249      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2019-10-15 01:36:26,793 INFO  L373      AbstractCegarLoop]: Interprodecural is true
[2019-10-15 01:36:26,793 INFO  L374      AbstractCegarLoop]: Hoare is true
[2019-10-15 01:36:26,794 INFO  L375      AbstractCegarLoop]: Compute interpolants for FPandBP
[2019-10-15 01:36:26,794 INFO  L376      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2019-10-15 01:36:26,794 INFO  L377      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2019-10-15 01:36:26,794 INFO  L378      AbstractCegarLoop]: Difference is false
[2019-10-15 01:36:26,794 INFO  L379      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2019-10-15 01:36:26,794 INFO  L383      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2019-10-15 01:36:26,808 INFO  L276                IsEmpty]: Start isEmpty. Operand 25 states.
[2019-10-15 01:36:26,814 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2019-10-15 01:36:26,814 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:26,815 INFO  L380         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:26,816 INFO  L410      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:26,820 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:26,821 INFO  L82        PathProgramCache]: Analyzing trace with hash 1479269286, now seen corresponding path program 1 times
[2019-10-15 01:36:26,827 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:26,828 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182156421]
[2019-10-15 01:36:26,828 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:26,828 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:26,829 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:26,934 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:27,001 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-10-15 01:36:27,002 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182156421]
[2019-10-15 01:36:27,003 INFO  L223   tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2019-10-15 01:36:27,004 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2019-10-15 01:36:27,004 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342924216]
[2019-10-15 01:36:27,008 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 3 states
[2019-10-15 01:36:27,008 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:27,022 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2019-10-15 01:36:27,023 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2019-10-15 01:36:27,026 INFO  L87              Difference]: Start difference. First operand 25 states. Second operand 3 states.
[2019-10-15 01:36:27,090 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:27,091 INFO  L93              Difference]: Finished difference Result 45 states and 57 transitions.
[2019-10-15 01:36:27,092 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2019-10-15 01:36:27,093 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 17
[2019-10-15 01:36:27,094 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:27,105 INFO  L225             Difference]: With dead ends: 45
[2019-10-15 01:36:27,105 INFO  L226             Difference]: Without dead ends: 28
[2019-10-15 01:36:27,110 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2019-10-15 01:36:27,130 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28 states.
[2019-10-15 01:36:27,174 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 23.
[2019-10-15 01:36:27,176 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 23 states.
[2019-10-15 01:36:27,179 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions.
[2019-10-15 01:36:27,181 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 17
[2019-10-15 01:36:27,181 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:27,182 INFO  L462      AbstractCegarLoop]: Abstraction has 23 states and 26 transitions.
[2019-10-15 01:36:27,182 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2019-10-15 01:36:27,182 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions.
[2019-10-15 01:36:27,184 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2019-10-15 01:36:27,184 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:27,184 INFO  L380         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:27,186 INFO  L410      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:27,187 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:27,187 INFO  L82        PathProgramCache]: Analyzing trace with hash -1182159136, now seen corresponding path program 1 times
[2019-10-15 01:36:27,188 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:27,188 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106403571]
[2019-10-15 01:36:27,188 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:27,189 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:27,189 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:27,257 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:27,329 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-10-15 01:36:27,330 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106403571]
[2019-10-15 01:36:27,330 INFO  L223   tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2019-10-15 01:36:27,334 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2019-10-15 01:36:27,334 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476406452]
[2019-10-15 01:36:27,337 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 4 states
[2019-10-15 01:36:27,337 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:27,338 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2019-10-15 01:36:27,338 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2019-10-15 01:36:27,341 INFO  L87              Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 4 states.
[2019-10-15 01:36:27,380 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:27,380 INFO  L93              Difference]: Finished difference Result 39 states and 45 transitions.
[2019-10-15 01:36:27,381 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2019-10-15 01:36:27,381 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 18
[2019-10-15 01:36:27,381 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:27,382 INFO  L225             Difference]: With dead ends: 39
[2019-10-15 01:36:27,383 INFO  L226             Difference]: Without dead ends: 24
[2019-10-15 01:36:27,384 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2019-10-15 01:36:27,384 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2019-10-15 01:36:27,389 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24.
[2019-10-15 01:36:27,389 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 24 states.
[2019-10-15 01:36:27,390 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions.
[2019-10-15 01:36:27,391 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 18
[2019-10-15 01:36:27,391 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:27,391 INFO  L462      AbstractCegarLoop]: Abstraction has 24 states and 27 transitions.
[2019-10-15 01:36:27,391 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2019-10-15 01:36:27,391 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions.
[2019-10-15 01:36:27,392 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2019-10-15 01:36:27,392 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:27,393 INFO  L380         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:27,393 INFO  L410      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:27,393 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:27,394 INFO  L82        PathProgramCache]: Analyzing trace with hash 1245451041, now seen corresponding path program 1 times
[2019-10-15 01:36:27,394 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:27,394 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636883790]
[2019-10-15 01:36:27,394 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:27,395 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:27,395 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:27,419 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:27,489 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-10-15 01:36:27,489 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636883790]
[2019-10-15 01:36:27,489 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268680723]
[2019-10-15 01:36:27,490 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:27,560 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:27,563 INFO  L256         TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core
[2019-10-15 01:36:27,569 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2019-10-15 01:36:27,630 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-10-15 01:36:27,631 INFO  L321         TraceCheckSpWp]: Computing backward predicates...
[2019-10-15 01:36:27,721 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-10-15 01:36:27,721 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1856123933]
[2019-10-15 01:36:27,748 INFO  L162        IcfgInterpreter]: Started Sifa with 18 locations of interest
[2019-10-15 01:36:27,748 INFO  L169        IcfgInterpreter]: Building call graph
[2019-10-15 01:36:27,755 INFO  L174        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2019-10-15 01:36:27,764 INFO  L179        IcfgInterpreter]: Starting interpretation
[2019-10-15 01:36:27,764 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2019-10-15 01:36:27,963 INFO  L199        IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs
[2019-10-15 01:36:29,506 INFO  L199        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs
[2019-10-15 01:36:29,519 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs
[2019-10-15 01:36:29,523 INFO  L199        IcfgInterpreter]: Interpreting procedure init with input of size 40 for LOIs
[2019-10-15 01:36:29,702 INFO  L183        IcfgInterpreter]: Interpretation finished
[2019-10-15 01:36:30,608 INFO  L223   tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences.
[2019-10-15 01:36:30,608 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 15] total 24
[2019-10-15 01:36:30,608 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975797851]
[2019-10-15 01:36:30,610 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 24 states
[2019-10-15 01:36:30,610 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:30,611 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2019-10-15 01:36:30,612 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=473, Unknown=0, NotChecked=0, Total=552
[2019-10-15 01:36:30,612 INFO  L87              Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 24 states.
[2019-10-15 01:36:31,932 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:31,933 INFO  L93              Difference]: Finished difference Result 54 states and 63 transitions.
[2019-10-15 01:36:31,933 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. 
[2019-10-15 01:36:31,933 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 19
[2019-10-15 01:36:31,934 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:31,935 INFO  L225             Difference]: With dead ends: 54
[2019-10-15 01:36:31,935 INFO  L226             Difference]: Without dead ends: 38
[2019-10-15 01:36:31,936 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=221, Invalid=1419, Unknown=0, NotChecked=0, Total=1640
[2019-10-15 01:36:31,936 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 38 states.
[2019-10-15 01:36:31,942 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 27.
[2019-10-15 01:36:31,942 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 27 states.
[2019-10-15 01:36:31,943 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions.
[2019-10-15 01:36:31,944 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 19
[2019-10-15 01:36:31,944 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:31,944 INFO  L462      AbstractCegarLoop]: Abstraction has 27 states and 30 transitions.
[2019-10-15 01:36:31,944 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2019-10-15 01:36:31,944 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions.
[2019-10-15 01:36:31,945 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2019-10-15 01:36:31,945 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:31,945 INFO  L380         BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:32,149 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:32,153 INFO  L410      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:32,153 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:32,153 INFO  L82        PathProgramCache]: Analyzing trace with hash -2061420768, now seen corresponding path program 2 times
[2019-10-15 01:36:32,153 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:32,153 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166906179]
[2019-10-15 01:36:32,154 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:32,154 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:32,154 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:32,202 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:32,294 INFO  L134       CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-10-15 01:36:32,294 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166906179]
[2019-10-15 01:36:32,294 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1174142965]
[2019-10-15 01:36:32,295 INFO  L92    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:32,373 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2019-10-15 01:36:32,374 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2019-10-15 01:36:32,375 INFO  L256         TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core
[2019-10-15 01:36:32,377 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2019-10-15 01:36:32,395 INFO  L134       CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:32,396 INFO  L321         TraceCheckSpWp]: Computing backward predicates...
[2019-10-15 01:36:32,424 INFO  L134       CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:32,425 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954582400]
[2019-10-15 01:36:32,426 INFO  L162        IcfgInterpreter]: Started Sifa with 18 locations of interest
[2019-10-15 01:36:32,427 INFO  L169        IcfgInterpreter]: Building call graph
[2019-10-15 01:36:32,428 INFO  L174        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2019-10-15 01:36:32,428 INFO  L179        IcfgInterpreter]: Starting interpretation
[2019-10-15 01:36:32,429 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2019-10-15 01:36:32,461 INFO  L199        IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs
[2019-10-15 01:36:33,393 INFO  L199        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs
[2019-10-15 01:36:33,402 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs
[2019-10-15 01:36:33,405 INFO  L199        IcfgInterpreter]: Interpreting procedure init with input of size 40 for LOIs
[2019-10-15 01:36:33,530 INFO  L183        IcfgInterpreter]: Interpretation finished
[2019-10-15 01:36:34,347 INFO  L223   tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences.
[2019-10-15 01:36:34,347 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 15] total 26
[2019-10-15 01:36:34,348 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066764637]
[2019-10-15 01:36:34,349 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 26 states
[2019-10-15 01:36:34,349 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:34,349 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants.
[2019-10-15 01:36:34,350 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=563, Unknown=0, NotChecked=0, Total=650
[2019-10-15 01:36:34,350 INFO  L87              Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 26 states.
[2019-10-15 01:36:35,892 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:35,892 INFO  L93              Difference]: Finished difference Result 68 states and 82 transitions.
[2019-10-15 01:36:35,893 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. 
[2019-10-15 01:36:35,893 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states. Word has length 22
[2019-10-15 01:36:35,893 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:35,894 INFO  L225             Difference]: With dead ends: 68
[2019-10-15 01:36:35,894 INFO  L226             Difference]: Without dead ends: 53
[2019-10-15 01:36:35,896 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=266, Invalid=1804, Unknown=0, NotChecked=0, Total=2070
[2019-10-15 01:36:35,896 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 53 states.
[2019-10-15 01:36:35,903 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 31.
[2019-10-15 01:36:35,903 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2019-10-15 01:36:35,904 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions.
[2019-10-15 01:36:35,904 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 22
[2019-10-15 01:36:35,905 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:35,905 INFO  L462      AbstractCegarLoop]: Abstraction has 31 states and 34 transitions.
[2019-10-15 01:36:35,905 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 26 states.
[2019-10-15 01:36:35,905 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions.
[2019-10-15 01:36:35,906 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2019-10-15 01:36:35,906 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:35,906 INFO  L380         BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:36,112 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:36,113 INFO  L410      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:36,113 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:36,113 INFO  L82        PathProgramCache]: Analyzing trace with hash -631379323, now seen corresponding path program 3 times
[2019-10-15 01:36:36,113 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:36,114 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853095506]
[2019-10-15 01:36:36,114 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:36,114 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:36,114 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:36,149 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:36,238 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:36,238 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853095506]
[2019-10-15 01:36:36,239 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77175936]
[2019-10-15 01:36:36,239 INFO  L92    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:36,341 INFO  L249   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2019-10-15 01:36:36,341 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2019-10-15 01:36:36,342 INFO  L256         TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 9 conjunts are in the unsatisfiable core
[2019-10-15 01:36:36,345 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2019-10-15 01:36:36,428 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:36,428 INFO  L321         TraceCheckSpWp]: Computing backward predicates...
[2019-10-15 01:36:36,601 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:36,602 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105677940]
[2019-10-15 01:36:36,604 INFO  L162        IcfgInterpreter]: Started Sifa with 18 locations of interest
[2019-10-15 01:36:36,604 INFO  L169        IcfgInterpreter]: Building call graph
[2019-10-15 01:36:36,604 INFO  L174        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2019-10-15 01:36:36,605 INFO  L179        IcfgInterpreter]: Starting interpretation
[2019-10-15 01:36:36,605 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2019-10-15 01:36:36,642 INFO  L199        IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs
[2019-10-15 01:36:37,391 INFO  L199        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs
[2019-10-15 01:36:37,397 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs
[2019-10-15 01:36:37,400 INFO  L199        IcfgInterpreter]: Interpreting procedure init with input of size 40 for LOIs
[2019-10-15 01:36:37,490 INFO  L183        IcfgInterpreter]: Interpretation finished
[2019-10-15 01:36:38,214 INFO  L223   tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences.
[2019-10-15 01:36:38,215 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 15] total 36
[2019-10-15 01:36:38,215 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082807119]
[2019-10-15 01:36:38,217 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 36 states
[2019-10-15 01:36:38,217 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:38,217 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants.
[2019-10-15 01:36:38,218 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1021, Unknown=0, NotChecked=0, Total=1260
[2019-10-15 01:36:38,218 INFO  L87              Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 36 states.
[2019-10-15 01:36:39,958 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:39,959 INFO  L93              Difference]: Finished difference Result 68 states and 81 transitions.
[2019-10-15 01:36:39,959 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. 
[2019-10-15 01:36:39,960 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states. Word has length 26
[2019-10-15 01:36:39,960 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:39,961 INFO  L225             Difference]: With dead ends: 68
[2019-10-15 01:36:39,961 INFO  L226             Difference]: Without dead ends: 49
[2019-10-15 01:36:39,964 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1218 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=567, Invalid=3093, Unknown=0, NotChecked=0, Total=3660
[2019-10-15 01:36:39,965 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 49 states.
[2019-10-15 01:36:39,971 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38.
[2019-10-15 01:36:39,971 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 38 states.
[2019-10-15 01:36:39,972 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions.
[2019-10-15 01:36:39,972 INFO  L78                 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 26
[2019-10-15 01:36:39,973 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:39,973 INFO  L462      AbstractCegarLoop]: Abstraction has 38 states and 41 transitions.
[2019-10-15 01:36:39,973 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 36 states.
[2019-10-15 01:36:39,973 INFO  L276                IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions.
[2019-10-15 01:36:39,974 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 34
[2019-10-15 01:36:39,974 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:39,974 INFO  L380         BasicCegarLoop]: trace histogram [12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:40,179 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:40,179 INFO  L410      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:40,180 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:40,180 INFO  L82        PathProgramCache]: Analyzing trace with hash -225187482, now seen corresponding path program 4 times
[2019-10-15 01:36:40,180 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:40,181 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931807356]
[2019-10-15 01:36:40,181 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:40,181 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:40,181 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:40,214 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:40,412 INFO  L134       CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:40,413 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931807356]
[2019-10-15 01:36:40,413 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582308803]
[2019-10-15 01:36:40,413 INFO  L92    rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:40,555 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:40,557 INFO  L256         TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 16 conjunts are in the unsatisfiable core
[2019-10-15 01:36:40,566 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2019-10-15 01:36:40,752 INFO  L134       CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:40,752 INFO  L321         TraceCheckSpWp]: Computing backward predicates...
[2019-10-15 01:36:41,187 INFO  L134       CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:41,187 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1137130735]
[2019-10-15 01:36:41,189 INFO  L162        IcfgInterpreter]: Started Sifa with 18 locations of interest
[2019-10-15 01:36:41,189 INFO  L169        IcfgInterpreter]: Building call graph
[2019-10-15 01:36:41,190 INFO  L174        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2019-10-15 01:36:41,190 INFO  L179        IcfgInterpreter]: Starting interpretation
[2019-10-15 01:36:41,190 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2019-10-15 01:36:41,213 INFO  L199        IcfgInterpreter]: Interpreting procedure main with input of size 24 for LOIs
[2019-10-15 01:36:41,965 INFO  L199        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs
[2019-10-15 01:36:41,972 INFO  L199        IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs
[2019-10-15 01:36:41,975 INFO  L199        IcfgInterpreter]: Interpreting procedure init with input of size 40 for LOIs
[2019-10-15 01:36:42,116 INFO  L183        IcfgInterpreter]: Interpretation finished
[2019-10-15 01:36:43,110 INFO  L223   tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences.
[2019-10-15 01:36:43,111 INFO  L236   tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 15] total 57
[2019-10-15 01:36:43,111 INFO  L342   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998420839]
[2019-10-15 01:36:43,112 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 57 states
[2019-10-15 01:36:43,112 INFO  L137   tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2019-10-15 01:36:43,113 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants.
[2019-10-15 01:36:43,114 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=827, Invalid=2365, Unknown=0, NotChecked=0, Total=3192
[2019-10-15 01:36:43,114 INFO  L87              Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 57 states.
[2019-10-15 01:36:45,624 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-10-15 01:36:45,625 INFO  L93              Difference]: Finished difference Result 82 states and 102 transitions.
[2019-10-15 01:36:45,625 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. 
[2019-10-15 01:36:45,625 INFO  L78                 Accepts]: Start accepts. Automaton has 57 states. Word has length 33
[2019-10-15 01:36:45,626 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-10-15 01:36:45,626 INFO  L225             Difference]: With dead ends: 82
[2019-10-15 01:36:45,627 INFO  L226             Difference]: Without dead ends: 63
[2019-10-15 01:36:45,629 INFO  L600         BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3227 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1827, Invalid=7293, Unknown=0, NotChecked=0, Total=9120
[2019-10-15 01:36:45,629 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 63 states.
[2019-10-15 01:36:45,637 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 52.
[2019-10-15 01:36:45,637 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 52 states.
[2019-10-15 01:36:45,638 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions.
[2019-10-15 01:36:45,638 INFO  L78                 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 33
[2019-10-15 01:36:45,638 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-10-15 01:36:45,638 INFO  L462      AbstractCegarLoop]: Abstraction has 52 states and 55 transitions.
[2019-10-15 01:36:45,639 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 57 states.
[2019-10-15 01:36:45,639 INFO  L276                IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions.
[2019-10-15 01:36:45,640 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 48
[2019-10-15 01:36:45,640 INFO  L372         BasicCegarLoop]: Found error trace
[2019-10-15 01:36:45,640 INFO  L380         BasicCegarLoop]: trace histogram [26, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-10-15 01:36:45,844 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:45,844 INFO  L410      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-10-15 01:36:45,845 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-10-15 01:36:45,845 INFO  L82        PathProgramCache]: Analyzing trace with hash -1595507578, now seen corresponding path program 5 times
[2019-10-15 01:36:45,846 INFO  L157   tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2019-10-15 01:36:45,846 INFO  L342   tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165358053]
[2019-10-15 01:36:45,846 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:45,847 INFO  L116   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2019-10-15 01:36:45,847 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-10-15 01:36:45,923 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-10-15 01:36:46,444 INFO  L134       CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2019-10-15 01:36:46,445 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165358053]
[2019-10-15 01:36:46,445 INFO  L342   tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112541830]
[2019-10-15 01:36:46,445 INFO  L92    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-10-15 01:36:46,575 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2019-10-15 01:36:46,576 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2019-10-15 01:36:46,578 INFO  L256         TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 23 conjunts are in the unsatisfiable core
[2019-10-15 01:36:46,580 INFO  L279         TraceCheckSpWp]: Computing forward predicates...
[2019-10-15 01:36:46,983 INFO  L134       CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked.
[2019-10-15 01:36:46,984 INFO  L321         TraceCheckSpWp]: Computing backward predicates...