/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 16:26:24,034 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 16:26:24,037 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 16:26:24,081 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 16:26:24,082 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 16:26:24,093 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 16:26:24,094 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 16:26:24,097 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 16:26:24,101 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 16:26:24,105 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 16:26:24,106 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 16:26:24,108 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 16:26:24,108 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 16:26:24,112 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 16:26:24,114 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 16:26:24,116 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 16:26:24,118 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 16:26:24,119 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 16:26:24,122 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 16:26:24,129 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 16:26:24,131 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 16:26:24,131 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 16:26:24,134 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 16:26:24,135 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 16:26:24,138 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 16:26:24,138 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 16:26:24,138 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 16:26:24,141 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 16:26:24,142 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 16:26:24,144 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 16:26:24,144 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 16:26:24,145 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 16:26:24,146 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 16:26:24,147 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 16:26:24,148 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 16:26:24,148 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 16:26:24,149 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 16:26:24,149 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 16:26:24,150 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 16:26:24,151 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 16:26:24,152 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 16:26:24,153 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 16:26:24,198 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 16:26:24,199 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 16:26:24,201 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 16:26:24,201 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 16:26:24,202 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 16:26:24,202 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 16:26:24,202 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 16:26:24,202 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 16:26:24,203 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 16:26:24,203 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 16:26:24,204 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 16:26:24,204 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 16:26:24,204 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 16:26:24,205 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 16:26:24,205 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 16:26:24,205 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 16:26:24,205 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 16:26:24,206 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 16:26:24,206 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 16:26:24,206 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 16:26:24,206 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 16:26:24,206 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 16:26:24,207 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 16:26:24,207 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 16:26:24,207 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 16:26:24,207 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 16:26:24,207 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 16:26:24,208 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 16:26:24,208 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 16:26:24,208 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
[2020-08-18 16:26:24,548 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 16:26:24,560 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 16:26:24,564 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 16:26:24,565 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 16:26:24,566 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 16:26:24,567 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 16:26:24,636 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c11e5db66/f51cc3086c9a427d8a5a5e0518606773/FLAG713a773cb
[2020-08-18 16:26:25,292 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 16:26:25,292 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 16:26:25,326 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c11e5db66/f51cc3086c9a427d8a5a5e0518606773/FLAG713a773cb
[2020-08-18 16:26:25,450 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c11e5db66/f51cc3086c9a427d8a5a5e0518606773
[2020-08-18 16:26:25,463 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 16:26:25,465 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 16:26:25,469 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 16:26:25,469 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 16:26:25,473 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 16:26:25,474 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:26:25" (1/1) ...
[2020-08-18 16:26:25,478 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a59c72f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:25, skipping insertion in model container
[2020-08-18 16:26:25,478 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:26:25" (1/1) ...
[2020-08-18 16:26:25,487 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 16:26:25,685 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 16:26:27,166 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 16:26:27,180 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 16:26:28,592 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 16:26:28,642 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 16:26:28,645 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28 WrapperNode
[2020-08-18 16:26:28,645 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 16:26:28,646 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 16:26:28,646 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 16:26:28,647 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 16:26:28,670 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,673 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,722 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,723 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,797 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,847 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,878 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
[2020-08-18 16:26:28,911 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 16:26:28,912 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 16:26:28,912 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 16:26:28,913 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 16:26:28,914 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/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
[2020-08-18 16:26:29,011 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 16:26:29,012 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 16:26:29,012 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 16:26:29,012 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 16:26:29,013 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 16:26:29,013 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 16:26:29,013 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 16:26:29,013 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 16:26:29,014 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 16:26:29,014 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 16:26:29,014 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 16:26:29,014 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 16:26:29,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 16:26:29,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 16:26:29,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 16:26:29,015 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 16:26:29,016 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 16:26:29,016 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 16:26:29,016 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 16:26:29,017 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 16:26:29,017 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 16:26:29,017 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 16:26:33,014 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 16:26:33,014 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 16:26:33,026 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:26:33 BoogieIcfgContainer
[2020-08-18 16:26:33,026 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 16:26:33,028 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 16:26:33,028 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 16:26:33,031 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 16:26:33,031 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:26:25" (1/3) ...
[2020-08-18 16:26:33,032 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32583f33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:26:33, skipping insertion in model container
[2020-08-18 16:26:33,032 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:26:28" (2/3) ...
[2020-08-18 16:26:33,032 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32583f33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:26:33, skipping insertion in model container
[2020-08-18 16:26:33,033 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:26:33" (3/3) ...
[2020-08-18 16:26:33,034 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-18 16:26:33,045 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 16:26:33,054 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 16:26:33,068 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 16:26:33,098 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 16:26:33,098 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 16:26:33,099 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 16:26:33,099 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 16:26:33,099 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 16:26:33,099 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 16:26:33,099 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 16:26:33,099 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 16:26:33,140 INFO  L276                IsEmpty]: Start isEmpty. Operand 1322 states.
[2020-08-18 16:26:33,179 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-18 16:26:33,179 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:26:33,181 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1]
[2020-08-18 16:26:33,182 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:26:33,188 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:26:33,188 INFO  L82        PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times
[2020-08-18 16:26:33,197 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:26:33,198 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858199104]
[2020-08-18 16:26:33,198 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:26:34,388 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:26:35,915 WARN  L193               SmtUtils]: Spent 900.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-18 16:26:35,919 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:26:35,937 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:26:36,243 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:26:36,244 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858199104]
[2020-08-18 16:26:36,246 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:26:36,246 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 16:26:36,247 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823045999]
[2020-08-18 16:26:36,254 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 16:26:36,254 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:26:36,269 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 16:26:36,270 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 16:26:36,272 INFO  L87              Difference]: Start difference. First operand 1322 states. Second operand 4 states.
[2020-08-18 16:26:37,104 WARN  L193               SmtUtils]: Spent 744.00 ms on a formula simplification that was a NOOP. DAG size: 389
[2020-08-18 16:26:46,419 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:26:46,419 INFO  L93              Difference]: Finished difference Result 2212 states and 3947 transitions.
[2020-08-18 16:26:46,420 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 16:26:46,422 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 467
[2020-08-18 16:26:46,424 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:26:46,458 INFO  L225             Difference]: With dead ends: 2212
[2020-08-18 16:26:46,459 INFO  L226             Difference]: Without dead ends: 1956
[2020-08-18 16:26:46,466 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 16:26:46,489 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1956 states.
[2020-08-18 16:26:46,650 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1956 to 1954.
[2020-08-18 16:26:46,651 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1954 states.
[2020-08-18 16:26:46,666 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3183 transitions.
[2020-08-18 16:26:46,668 INFO  L78                 Accepts]: Start accepts. Automaton has 1954 states and 3183 transitions. Word has length 467
[2020-08-18 16:26:46,672 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:26:46,673 INFO  L479      AbstractCegarLoop]: Abstraction has 1954 states and 3183 transitions.
[2020-08-18 16:26:46,673 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 16:26:46,673 INFO  L276                IsEmpty]: Start isEmpty. Operand 1954 states and 3183 transitions.
[2020-08-18 16:26:46,689 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-18 16:26:46,690 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:26:46,690 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1]
[2020-08-18 16:26:46,691 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 16:26:46,691 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:26:46,691 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:26:46,692 INFO  L82        PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times
[2020-08-18 16:26:46,692 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:26:46,692 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889127433]
[2020-08-18 16:26:46,693 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:26:48,008 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:26:49,201 WARN  L193               SmtUtils]: Spent 750.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-18 16:26:49,204 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:26:49,217 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:26:49,953 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:26:49,954 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889127433]
[2020-08-18 16:26:49,955 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:26:49,956 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 16:26:49,956 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750434359]
[2020-08-18 16:26:49,962 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 16:26:49,963 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:26:49,963 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 16:26:49,963 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 16:26:49,964 INFO  L87              Difference]: Start difference. First operand 1954 states and 3183 transitions. Second operand 5 states.
[2020-08-18 16:27:04,346 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:27:04,347 INFO  L93              Difference]: Finished difference Result 5793 states and 9438 transitions.
[2020-08-18 16:27:04,347 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 16:27:04,347 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 467
[2020-08-18 16:27:04,348 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:27:04,368 INFO  L225             Difference]: With dead ends: 5793
[2020-08-18 16:27:04,369 INFO  L226             Difference]: Without dead ends: 3856
[2020-08-18 16:27:04,378 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 16:27:04,383 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3856 states.
[2020-08-18 16:27:04,521 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3856 to 3854.
[2020-08-18 16:27:04,521 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3854 states.
[2020-08-18 16:27:04,533 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3854 states to 3854 states and 6254 transitions.
[2020-08-18 16:27:04,533 INFO  L78                 Accepts]: Start accepts. Automaton has 3854 states and 6254 transitions. Word has length 467
[2020-08-18 16:27:04,534 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:27:04,534 INFO  L479      AbstractCegarLoop]: Abstraction has 3854 states and 6254 transitions.
[2020-08-18 16:27:04,534 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 16:27:04,534 INFO  L276                IsEmpty]: Start isEmpty. Operand 3854 states and 6254 transitions.
[2020-08-18 16:27:04,546 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 470
[2020-08-18 16:27:04,546 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:27:04,547 INFO  L422         BasicCegarLoop]: trace histogram [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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 1, 1, 1, 1, 1]
[2020-08-18 16:27:04,547 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 16:27:04,547 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:27:04,548 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:27:04,548 INFO  L82        PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times
[2020-08-18 16:27:04,548 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:27:04,549 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993373903]
[2020-08-18 16:27:04,549 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:27:04,837 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:27:05,775 WARN  L193               SmtUtils]: Spent 725.00 ms on a formula simplification that was a NOOP. DAG size: 388
[2020-08-18 16:27:05,777 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:27:05,793 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:27:06,290 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:27:06,292 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993373903]
[2020-08-18 16:27:06,292 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:27:06,292 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 16:27:06,293 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321873289]
[2020-08-18 16:27:06,294 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 16:27:06,294 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:27:06,294 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 16:27:06,295 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 16:27:06,295 INFO  L87              Difference]: Start difference. First operand 3854 states and 6254 transitions. Second operand 4 states.