/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 enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -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+lhb-reducer.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 20:27:52,228 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 20:27:52,231 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 20:27:52,255 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 20:27:52,255 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 20:27:52,257 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 20:27:52,258 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 20:27:52,260 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 20:27:52,261 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 20:27:52,262 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 20:27:52,263 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 20:27:52,264 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 20:27:52,264 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 20:27:52,265 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 20:27:52,266 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 20:27:52,268 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 20:27:52,268 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 20:27:52,269 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 20:27:52,271 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 20:27:52,273 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 20:27:52,274 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 20:27:52,275 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 20:27:52,277 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 20:27:52,277 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 20:27:52,280 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 20:27:52,280 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 20:27:52,280 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 20:27:52,281 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 20:27:52,282 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 20:27:52,283 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 20:27:52,283 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 20:27:52,284 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 20:27:52,285 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 20:27:52,285 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 20:27:52,286 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 20:27:52,286 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 20:27:52,287 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-08-18 20:27:52,288 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-18 20:27:52,289 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 20:27:52,290 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 20:27:52,313 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 20:27:52,313 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 20:27:52,314 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 20:27:52,315 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 20:27:52,315 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 20:27:52,315 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 20:27:52,315 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 20:27:52,315 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 20:27:52,316 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 20:27:52,316 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 20:27:52,316 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 20:27:52,316 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 20:27:52,316 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 20:27:52,317 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 20:27:52,317 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 20:27:52,317 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 20:27:52,317 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 20:27:52,317 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 20:27:52,321 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 20:27:52,321 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 20:27:52,321 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 20:27:52,321 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:27:52,322 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 20:27:52,322 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 20:27:52,322 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 -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
[2020-08-18 20:27:52,649 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 20:27:52,669 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 20:27:52,675 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 20:27:52,677 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 20:27:52,677 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 20:27:52,678 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-08-18 20:27:52,740 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bcbc0ffe4/28768bd3612c4a19bcff1fb0b2382aa8/FLAGd2d643cc2
[2020-08-18 20:27:53,494 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 20:27:53,495 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-08-18 20:27:53,527 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bcbc0ffe4/28768bd3612c4a19bcff1fb0b2382aa8/FLAGd2d643cc2
[2020-08-18 20:27:53,579 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bcbc0ffe4/28768bd3612c4a19bcff1fb0b2382aa8
[2020-08-18 20:27:53,589 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 20:27:53,590 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 20:27:53,591 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 20:27:53,591 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 20:27:53,596 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 20:27:53,597 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:27:53" (1/1) ...
[2020-08-18 20:27:53,602 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ed487d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:53, skipping insertion in model container
[2020-08-18 20:27:53,602 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:27:53" (1/1) ...
[2020-08-18 20:27:53,611 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 20:27:53,802 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 20:27:55,268 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:27:55,281 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 20:27:56,415 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:27:56,456 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 20:27:56,457 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56 WrapperNode
[2020-08-18 20:27:56,457 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 20:27:56,458 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 20:27:56,459 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 20:27:56,459 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 20:27:56,470 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,470 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,509 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,509 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,587 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,621 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,637 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (1/1) ...
[2020-08-18 20:27:56,657 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 20:27:56,658 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 20:27:56,658 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 20:27:56,658 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 20:27:56,659 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (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 20:27:56,731 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 20:27:56,731 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 20:27:56,731 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 20:27:56,732 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 20:27:56,732 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 20:27:56,733 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 20:27:56,733 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 20:27:56,733 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 20:27:56,733 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 20:27:56,734 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 20:27:56,734 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 20:27:56,735 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 20:27:56,735 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 20:27:56,735 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 20:27:56,735 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 20:27:56,737 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 20:27:56,737 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 20:27:56,737 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 20:27:56,737 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 20:27:56,740 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 20:27:56,740 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 20:27:56,740 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 20:28:01,191 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 20:28:01,192 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 20:28:01,209 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:28:01 BoogieIcfgContainer
[2020-08-18 20:28:01,209 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 20:28:01,211 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 20:28:01,211 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 20:28:01,214 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 20:28:01,215 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:27:53" (1/3) ...
[2020-08-18 20:28:01,216 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321afd8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:28:01, skipping insertion in model container
[2020-08-18 20:28:01,216 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:27:56" (2/3) ...
[2020-08-18 20:28:01,217 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@321afd8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:28:01, skipping insertion in model container
[2020-08-18 20:28:01,217 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:28:01" (3/3) ...
[2020-08-18 20:28:01,220 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-08-18 20:28:01,230 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 20:28:01,243 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations.
[2020-08-18 20:28:01,257 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2020-08-18 20:28:01,294 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 20:28:01,294 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 20:28:01,294 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 20:28:01,295 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 20:28:01,295 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 20:28:01,295 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 20:28:01,295 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 20:28:01,295 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 20:28:01,347 INFO  L276                IsEmpty]: Start isEmpty. Operand 1371 states.
[2020-08-18 20:28:01,398 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 465
[2020-08-18 20:28:01,398 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:01,400 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]
[2020-08-18 20:28:01,400 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:01,407 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:01,407 INFO  L82        PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times
[2020-08-18 20:28:01,416 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:01,417 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262154418]
[2020-08-18 20:28:01,417 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:03,590 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:05,284 WARN  L193               SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 391
[2020-08-18 20:28:05,286 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:05,296 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:05,850 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 20:28:05,851 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262154418]
[2020-08-18 20:28:05,853 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:05,853 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 20:28:05,854 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762052691]
[2020-08-18 20:28:05,860 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 20:28:05,861 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:05,873 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 20:28:05,874 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 20:28:05,876 INFO  L87              Difference]: Start difference. First operand 1371 states. Second operand 5 states.
[2020-08-18 20:28:23,151 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:28:23,151 INFO  L93              Difference]: Finished difference Result 4059 states and 7350 transitions.
[2020-08-18 20:28:23,153 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 20:28:23,155 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 464
[2020-08-18 20:28:23,156 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:28:23,197 INFO  L225             Difference]: With dead ends: 4059
[2020-08-18 20:28:23,197 INFO  L226             Difference]: Without dead ends: 2697
[2020-08-18 20:28:23,210 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 20:28:23,234 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2697 states.
[2020-08-18 20:28:23,456 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2647.
[2020-08-18 20:28:23,457 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2647 states.
[2020-08-18 20:28:23,470 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4347 transitions.
[2020-08-18 20:28:23,472 INFO  L78                 Accepts]: Start accepts. Automaton has 2647 states and 4347 transitions. Word has length 464
[2020-08-18 20:28:23,473 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:28:23,473 INFO  L479      AbstractCegarLoop]: Abstraction has 2647 states and 4347 transitions.
[2020-08-18 20:28:23,473 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 20:28:23,474 INFO  L276                IsEmpty]: Start isEmpty. Operand 2647 states and 4347 transitions.
[2020-08-18 20:28:23,489 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 467
[2020-08-18 20:28:23,490 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:23,490 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]
[2020-08-18 20:28:23,491 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 20:28:23,491 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:23,491 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:23,492 INFO  L82        PathProgramCache]: Analyzing trace with hash -1286826198, now seen corresponding path program 1 times
[2020-08-18 20:28:23,492 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:23,492 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607333443]
[2020-08-18 20:28:23,493 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:23,771 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:25,483 WARN  L193               SmtUtils]: Spent 1.31 s on a formula simplification that was a NOOP. DAG size: 391
[2020-08-18 20:28:25,488 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:25,499 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:26,202 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 20:28:26,203 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607333443]
[2020-08-18 20:28:26,203 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:26,203 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:28:26,204 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053333036]
[2020-08-18 20:28:26,211 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:28:26,211 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:26,215 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:28:26,216 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:26,217 INFO  L87              Difference]: Start difference. First operand 2647 states and 4347 transitions. Second operand 4 states.
[2020-08-18 20:28:45,083 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:28:45,083 INFO  L93              Difference]: Finished difference Result 7670 states and 12560 transitions.
[2020-08-18 20:28:45,083 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 20:28:45,084 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 466
[2020-08-18 20:28:45,085 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:28:45,112 INFO  L225             Difference]: With dead ends: 7670
[2020-08-18 20:28:45,112 INFO  L226             Difference]: Without dead ends: 5237
[2020-08-18 20:28:45,119 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:45,126 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5237 states.
[2020-08-18 20:28:45,291 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5237 to 5189.
[2020-08-18 20:28:45,291 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5189 states.
[2020-08-18 20:28:45,307 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5189 states to 5189 states and 8497 transitions.
[2020-08-18 20:28:45,309 INFO  L78                 Accepts]: Start accepts. Automaton has 5189 states and 8497 transitions. Word has length 466
[2020-08-18 20:28:45,310 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:28:45,311 INFO  L479      AbstractCegarLoop]: Abstraction has 5189 states and 8497 transitions.
[2020-08-18 20:28:45,311 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:28:45,311 INFO  L276                IsEmpty]: Start isEmpty. Operand 5189 states and 8497 transitions.
[2020-08-18 20:28:45,333 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-08-18 20:28:45,333 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:28:45,335 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 20:28:45,335 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 20:28:45,339 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:28:45,339 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:28:45,339 INFO  L82        PathProgramCache]: Analyzing trace with hash -244647039, now seen corresponding path program 1 times
[2020-08-18 20:28:45,340 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:28:45,340 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111028388]
[2020-08-18 20:28:45,341 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:28:45,409 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:46,563 WARN  L193               SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 391
[2020-08-18 20:28:46,565 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:28:46,572 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:28:46,741 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 20:28:46,742 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111028388]
[2020-08-18 20:28:46,742 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:28:46,742 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:28:46,743 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278763743]
[2020-08-18 20:28:46,744 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:28:46,744 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:28:46,744 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:28:46,745 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:28:46,745 INFO  L87              Difference]: Start difference. First operand 5189 states and 8497 transitions. Second operand 4 states.