/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 --traceabstraction.additional.smt.options log-additional-information=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.UNBOUNDED.pals.c.v+lhb-reducer.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 14:17:10,422 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 14:17:10,424 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 14:17:10,455 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 14:17:10,455 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 14:17:10,464 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 14:17:10,467 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 14:17:10,470 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 14:17:10,473 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 14:17:10,476 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 14:17:10,477 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 14:17:10,478 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 14:17:10,479 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 14:17:10,481 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 14:17:10,483 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 14:17:10,485 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 14:17:10,486 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 14:17:10,487 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 14:17:10,489 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 14:17:10,496 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 14:17:10,499 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 14:17:10,500 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 14:17:10,500 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 14:17:10,501 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 14:17:10,513 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 14:17:10,513 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 14:17:10,513 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 14:17:10,519 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 14:17:10,520 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 14:17:10,521 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 14:17:10,521 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 14:17:10,521 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 14:17:10,522 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 14:17:10,523 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 14:17:10,524 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 14:17:10,527 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 14:17:10,528 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 14:17:10,528 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 14:17:10,528 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 14:17:10,531 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 14:17:10,532 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 14:17:10,533 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
[2020-08-21 14:17:10,570 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 14:17:10,570 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 14:17:10,572 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 14:17:10,573 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 14:17:10,573 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 14:17:10,573 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 14:17:10,573 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 14:17:10,574 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 14:17:10,574 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 14:17:10,574 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 14:17:10,575 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 14:17:10,575 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 14:17:10,575 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 14:17:10,576 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 14:17:10,576 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 14:17:10,576 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 14:17:10,576 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 14:17:10,577 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 14:17:10,577 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 14:17:10,577 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 14:17:10,577 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 14:17:10,578 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 14:17:10,578 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 14:17:10,578 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 14:17:10,578 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 14:17:10,578 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 14:17:10,579 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 14:17:10,579 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 14:17:10,579 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 14:17:10,579 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
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> log-additional-information=true;
[2020-08-21 14:17:10,932 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 14:17:10,953 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 14:17:10,956 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 14:17:10,957 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 14:17:10,958 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 14:17:10,958 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-21 14:17:11,030 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97ba830a8/77c9745c9a9e40369f081307cfffe2ca/FLAGe5f02f330
[2020-08-21 14:17:11,694 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 14:17:11,695 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-21 14:17:11,723 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97ba830a8/77c9745c9a9e40369f081307cfffe2ca/FLAGe5f02f330
[2020-08-21 14:17:11,856 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/97ba830a8/77c9745c9a9e40369f081307cfffe2ca
[2020-08-21 14:17:11,867 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 14:17:11,869 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 14:17:11,870 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 14:17:11,871 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 14:17:11,874 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 14:17:11,875 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:17:11" (1/1) ...
[2020-08-21 14:17:11,878 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@328f810 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:11, skipping insertion in model container
[2020-08-21 14:17:11,879 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:17:11" (1/1) ...
[2020-08-21 14:17:11,887 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 14:17:12,102 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 14:17:13,599 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 14:17:13,613 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 14:17:14,750 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 14:17:14,798 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 14:17:14,800 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14 WrapperNode
[2020-08-21 14:17:14,800 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 14:17:14,801 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 14:17:14,801 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 14:17:14,801 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 14:17:14,819 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:14,822 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:14,892 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:14,892 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:14,955 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:14,988 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:15,005 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (1/1) ...
[2020-08-21 14:17:15,028 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 14:17:15,028 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 14:17:15,028 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 14:17:15,029 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 14:17:15,030 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (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
[2020-08-21 14:17:15,127 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 14:17:15,128 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 14:17:15,128 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-21 14:17:15,128 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 14:17:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 14:17:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-21 14:17:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-21 14:17:15,129 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-21 14:17:15,130 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-21 14:17:15,130 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-21 14:17:15,130 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-21 14:17:15,130 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-21 14:17:15,131 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-21 14:17:15,131 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-21 14:17:15,131 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-21 14:17:15,132 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-21 14:17:15,132 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-21 14:17:15,132 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-21 14:17:15,132 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-21 14:17:15,133 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-21 14:17:15,133 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 14:17:15,133 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 14:17:15,134 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 14:17:18,959 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 14:17:18,961 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 14:17:18,975 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:17:18 BoogieIcfgContainer
[2020-08-21 14:17:18,975 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 14:17:18,979 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 14:17:18,979 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 14:17:18,982 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 14:17:18,983 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:17:11" (1/3) ...
[2020-08-21 14:17:18,984 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e00ac15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:17:18, skipping insertion in model container
[2020-08-21 14:17:18,984 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:17:14" (2/3) ...
[2020-08-21 14:17:18,985 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e00ac15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:17:18, skipping insertion in model container
[2020-08-21 14:17:18,985 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:17:18" (3/3) ...
[2020-08-21 14:17:18,987 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-21 14:17:19,001 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 14:17:19,012 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations.
[2020-08-21 14:17:19,027 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2020-08-21 14:17:19,062 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 14:17:19,062 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 14:17:19,062 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 14:17:19,062 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 14:17:19,062 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 14:17:19,063 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 14:17:19,063 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 14:17:19,063 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 14:17:19,107 INFO  L276                IsEmpty]: Start isEmpty. Operand 1393 states.
[2020-08-21 14:17:19,155 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-08-21 14:17:19,155 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 14:17:19,157 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, 1, 1, 1, 1]
[2020-08-21 14:17:19,158 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 14:17:19,164 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 14:17:19,165 INFO  L82        PathProgramCache]: Analyzing trace with hash -1447603851, now seen corresponding path program 1 times
[2020-08-21 14:17:19,174 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 14:17:19,175 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381661065]
[2020-08-21 14:17:19,175 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 14:17:21,047 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:17:22,638 WARN  L193               SmtUtils]: Spent 879.00 ms on a formula simplification that was a NOOP. DAG size: 385
[2020-08-21 14:17:22,642 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 14:17:22,659 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:17:23,428 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 14:17:23,429 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381661065]
[2020-08-21 14:17:23,431 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 14:17:23,431 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-21 14:17:23,432 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712697384]
[2020-08-21 14:17:23,438 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-21 14:17:23,438 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 14:17:23,452 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-21 14:17:23,453 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-21 14:17:23,455 INFO  L87              Difference]: Start difference. First operand 1393 states. Second operand 5 states.
[2020-08-21 14:17:39,703 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 14:17:39,703 INFO  L93              Difference]: Finished difference Result 4125 states and 7467 transitions.
[2020-08-21 14:17:39,705 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-21 14:17:39,706 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 473
[2020-08-21 14:17:39,708 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 14:17:39,760 INFO  L225             Difference]: With dead ends: 4125
[2020-08-21 14:17:39,760 INFO  L226             Difference]: Without dead ends: 2741
[2020-08-21 14:17:39,772 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-21 14:17:39,793 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2741 states.
[2020-08-21 14:17:39,967 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2741 to 2688.
[2020-08-21 14:17:39,969 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2688 states.
[2020-08-21 14:17:39,981 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2688 states to 2688 states and 4398 transitions.
[2020-08-21 14:17:39,983 INFO  L78                 Accepts]: Start accepts. Automaton has 2688 states and 4398 transitions. Word has length 473
[2020-08-21 14:17:39,984 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 14:17:39,984 INFO  L479      AbstractCegarLoop]: Abstraction has 2688 states and 4398 transitions.
[2020-08-21 14:17:39,985 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-21 14:17:39,985 INFO  L276                IsEmpty]: Start isEmpty. Operand 2688 states and 4398 transitions.
[2020-08-21 14:17:39,998 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 476
[2020-08-21 14:17:39,998 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 14:17:39,999 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, 1, 1, 1, 1, 1, 1]
[2020-08-21 14:17:39,999 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 14:17:39,999 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 14:17:40,000 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 14:17:40,000 INFO  L82        PathProgramCache]: Analyzing trace with hash -369254340, now seen corresponding path program 1 times
[2020-08-21 14:17:40,000 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 14:17:40,001 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121891372]
[2020-08-21 14:17:40,001 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 14:17:40,249 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:17:41,670 WARN  L193               SmtUtils]: Spent 976.00 ms on a formula simplification that was a NOOP. DAG size: 385
[2020-08-21 14:17:41,674 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 14:17:41,686 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:17:42,151 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 14:17:42,152 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121891372]
[2020-08-21 14:17:42,152 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 14:17:42,152 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 14:17:42,153 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548985491]
[2020-08-21 14:17:42,155 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 14:17:42,155 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 14:17:42,156 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 14:17:42,156 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 14:17:42,156 INFO  L87              Difference]: Start difference. First operand 2688 states and 4398 transitions. Second operand 4 states.
[2020-08-21 14:17:59,708 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-21 14:17:59,708 INFO  L93              Difference]: Finished difference Result 7793 states and 12713 transitions.
[2020-08-21 14:17:59,716 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-21 14:17:59,716 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 475
[2020-08-21 14:17:59,717 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-21 14:17:59,748 INFO  L225             Difference]: With dead ends: 7793
[2020-08-21 14:17:59,749 INFO  L226             Difference]: Without dead ends: 5319
[2020-08-21 14:17:59,755 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 14:17:59,763 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5319 states.
[2020-08-21 14:17:59,951 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5319 to 5268.
[2020-08-21 14:17:59,952 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5268 states.
[2020-08-21 14:17:59,974 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 8596 transitions.
[2020-08-21 14:17:59,974 INFO  L78                 Accepts]: Start accepts. Automaton has 5268 states and 8596 transitions. Word has length 475
[2020-08-21 14:17:59,976 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-21 14:17:59,976 INFO  L479      AbstractCegarLoop]: Abstraction has 5268 states and 8596 transitions.
[2020-08-21 14:17:59,977 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-21 14:17:59,977 INFO  L276                IsEmpty]: Start isEmpty. Operand 5268 states and 8596 transitions.
[2020-08-21 14:18:00,007 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-08-21 14:18:00,008 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 14:18:00,009 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, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 14:18:00,010 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-21 14:18:00,014 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 14:18:00,015 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 14:18:00,015 INFO  L82        PathProgramCache]: Analyzing trace with hash -567190772, now seen corresponding path program 1 times
[2020-08-21 14:18:00,016 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 14:18:00,016 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119987308]
[2020-08-21 14:18:00,017 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 14:18:00,107 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:18:01,034 WARN  L193               SmtUtils]: Spent 774.00 ms on a formula simplification that was a NOOP. DAG size: 385
[2020-08-21 14:18:01,036 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-21 14:18:01,043 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-21 14:18:01,212 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-21 14:18:01,213 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1119987308]
[2020-08-21 14:18:01,213 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-21 14:18:01,213 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-21 14:18:01,214 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116487895]
[2020-08-21 14:18:01,215 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-21 14:18:01,215 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-21 14:18:01,215 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-21 14:18:01,216 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-21 14:18:01,216 INFO  L87              Difference]: Start difference. First operand 5268 states and 8596 transitions. Second operand 4 states.