/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=BIGGEST -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 0.1.25-5644d1e-m
[2020-08-18 13:06:36,880 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 13:06:36,883 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 13:06:36,920 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 13:06:36,920 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 13:06:36,929 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 13:06:36,931 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 13:06:36,935 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 13:06:36,937 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 13:06:36,940 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 13:06:36,941 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 13:06:36,942 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 13:06:36,942 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 13:06:36,945 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 13:06:36,947 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 13:06:36,948 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 13:06:36,950 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 13:06:36,951 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 13:06:36,952 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 13:06:36,960 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 13:06:36,962 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 13:06:36,963 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 13:06:36,964 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 13:06:36,965 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 13:06:36,977 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 13:06:36,977 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 13:06:36,977 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 13:06:36,978 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 13:06:36,978 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 13:06:36,981 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 13:06:36,981 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 13:06:36,982 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 13:06:36,982 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 13:06:36,983 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 13:06:36,984 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 13:06:36,984 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 13:06:36,985 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 13:06:36,985 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 13:06:36,985 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 13:06:36,986 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 13:06:36,987 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 13:06:36,988 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 13:06:37,028 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 13:06:37,028 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 13:06:37,031 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 13:06:37,031 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 13:06:37,031 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 13:06:37,031 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 13:06:37,032 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 13:06:37,032 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 13:06:37,032 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 13:06:37,032 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 13:06:37,033 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 13:06:37,034 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 13:06:37,034 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 13:06:37,034 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 13:06:37,034 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 13:06:37,035 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 13:06:37,035 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 13:06:37,035 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 13:06:37,035 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 13:06:37,035 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 13:06:37,035 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 13:06:37,036 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 13:06:37,036 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 13:06:37,036 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 13:06:37,036 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 13:06:37,036 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 13:06:37,037 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 13:06:37,037 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 13:06:37,037 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 13:06:37,037 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=BIGGEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST;
[2020-08-18 13:06:37,353 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 13:06:37,367 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 13:06:37,372 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 13:06:37,380 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 13:06:37,381 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 13:06:37,381 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 13:06:37,441 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc594f75c/635b4040e1e34a53ab7ae399783a2892/FLAG45dd8c5d9
[2020-08-18 13:06:38,129 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 13:06:38,130 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 13:06:38,154 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc594f75c/635b4040e1e34a53ab7ae399783a2892/FLAG45dd8c5d9
[2020-08-18 13:06:38,241 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bc594f75c/635b4040e1e34a53ab7ae399783a2892
[2020-08-18 13:06:38,249 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 13:06:38,251 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 13:06:38,254 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 13:06:38,254 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 13:06:38,258 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 13:06:38,259 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:06:38" (1/1) ...
[2020-08-18 13:06:38,263 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d77a43a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:38, skipping insertion in model container
[2020-08-18 13:06:38,263 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 01:06:38" (1/1) ...
[2020-08-18 13:06:38,271 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 13:06:38,444 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 13:06:39,914 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:06:39,931 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 13:06:41,140 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 13:06:41,178 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 13:06:41,180 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41 WrapperNode
[2020-08-18 13:06:41,180 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 13:06:41,181 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 13:06:41,181 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 13:06:41,182 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 13:06:41,199 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,201 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,265 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,265 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,331 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,370 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,384 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (1/1) ...
[2020-08-18 13:06:41,409 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 13:06:41,410 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 13:06:41,410 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 13:06:41,410 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 13:06:41,412 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (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 13:06:41,494 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 13:06:41,495 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 13:06:41,495 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 13:06:41,495 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 13:06:41,496 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 13:06:41,496 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 13:06:41,496 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 13:06:41,497 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 13:06:41,497 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 13:06:41,497 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 13:06:41,498 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 13:06:41,498 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 13:06:41,498 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 13:06:41,499 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 13:06:41,499 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 13:06:41,500 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 13:06:41,500 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 13:06:41,500 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 13:06:41,500 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 13:06:41,501 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 13:06:41,501 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 13:06:41,501 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 13:06:41,501 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 13:06:45,736 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 13:06:45,738 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 13:06:45,756 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:06:45 BoogieIcfgContainer
[2020-08-18 13:06:45,756 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 13:06:45,758 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 13:06:45,759 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 13:06:45,762 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 13:06:45,762 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 01:06:38" (1/3) ...
[2020-08-18 13:06:45,763 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a51157f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:06:45, skipping insertion in model container
[2020-08-18 13:06:45,764 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 01:06:41" (2/3) ...
[2020-08-18 13:06:45,764 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a51157f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 01:06:45, skipping insertion in model container
[2020-08-18 13:06:45,764 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 01:06:45" (3/3) ...
[2020-08-18 13:06:45,766 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 13:06:45,777 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 13:06:45,790 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations.
[2020-08-18 13:06:45,804 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2020-08-18 13:06:45,837 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 13:06:45,837 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 13:06:45,837 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 13:06:45,837 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 13:06:45,837 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 13:06:45,838 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 13:06:45,838 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 13:06:45,838 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 13:06:45,881 INFO  L276                IsEmpty]: Start isEmpty. Operand 1393 states.
[2020-08-18 13:06:45,921 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-08-18 13:06:45,921 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:06:45,922 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]
[2020-08-18 13:06:45,923 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:06:45,929 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:06:45,930 INFO  L82        PathProgramCache]: Analyzing trace with hash -1447603851, now seen corresponding path program 1 times
[2020-08-18 13:06:45,938 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:06:45,939 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874347276]
[2020-08-18 13:06:45,940 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:06:47,594 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:06:49,277 WARN  L193               SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 385
[2020-08-18 13:06:49,279 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:06:49,289 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:06:49,687 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 13:06:49,688 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874347276]
[2020-08-18 13:06:49,690 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:06:49,690 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 13:06:49,691 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326082310]
[2020-08-18 13:06:49,698 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 13:06:49,698 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:06:49,709 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 13:06:49,710 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 13:06:49,711 INFO  L87              Difference]: Start difference. First operand 1393 states. Second operand 5 states.
[2020-08-18 13:07:06,087 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:06,088 INFO  L93              Difference]: Finished difference Result 4125 states and 7467 transitions.
[2020-08-18 13:07:06,089 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 13:07:06,090 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 473
[2020-08-18 13:07:06,092 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:06,129 INFO  L225             Difference]: With dead ends: 4125
[2020-08-18 13:07:06,129 INFO  L226             Difference]: Without dead ends: 2741
[2020-08-18 13:07:06,140 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-18 13:07:06,167 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2741 states.
[2020-08-18 13:07:06,340 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2741 to 2688.
[2020-08-18 13:07:06,341 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2688 states.
[2020-08-18 13:07:06,353 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2688 states to 2688 states and 4398 transitions.
[2020-08-18 13:07:06,355 INFO  L78                 Accepts]: Start accepts. Automaton has 2688 states and 4398 transitions. Word has length 473
[2020-08-18 13:07:06,356 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:06,357 INFO  L479      AbstractCegarLoop]: Abstraction has 2688 states and 4398 transitions.
[2020-08-18 13:07:06,357 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 13:07:06,357 INFO  L276                IsEmpty]: Start isEmpty. Operand 2688 states and 4398 transitions.
[2020-08-18 13:07:06,372 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 476
[2020-08-18 13:07:06,373 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:06,373 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]
[2020-08-18 13:07:06,374 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 13:07:06,374 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:06,374 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:06,375 INFO  L82        PathProgramCache]: Analyzing trace with hash -369254340, now seen corresponding path program 1 times
[2020-08-18 13:07:06,375 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:06,375 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906403914]
[2020-08-18 13:07:06,375 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:06,705 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:07,979 WARN  L193               SmtUtils]: Spent 750.00 ms on a formula simplification that was a NOOP. DAG size: 385
[2020-08-18 13:07:07,981 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:07,995 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:08,695 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 13:07:08,696 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906403914]
[2020-08-18 13:07:08,696 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:08,697 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:08,697 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747116633]
[2020-08-18 13:07:08,700 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:08,701 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:08,701 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:08,701 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:08,702 INFO  L87              Difference]: Start difference. First operand 2688 states and 4398 transitions. Second operand 4 states.
[2020-08-18 13:07:26,060 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 13:07:26,061 INFO  L93              Difference]: Finished difference Result 7793 states and 12713 transitions.
[2020-08-18 13:07:26,069 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 13:07:26,069 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 475
[2020-08-18 13:07:26,071 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 13:07:26,100 INFO  L225             Difference]: With dead ends: 7793
[2020-08-18 13:07:26,100 INFO  L226             Difference]: Without dead ends: 5319
[2020-08-18 13:07:26,107 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:26,115 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5319 states.
[2020-08-18 13:07:26,358 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5319 to 5268.
[2020-08-18 13:07:26,358 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5268 states.
[2020-08-18 13:07:26,377 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5268 states to 5268 states and 8596 transitions.
[2020-08-18 13:07:26,377 INFO  L78                 Accepts]: Start accepts. Automaton has 5268 states and 8596 transitions. Word has length 475
[2020-08-18 13:07:26,380 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 13:07:26,380 INFO  L479      AbstractCegarLoop]: Abstraction has 5268 states and 8596 transitions.
[2020-08-18 13:07:26,380 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 13:07:26,380 INFO  L276                IsEmpty]: Start isEmpty. Operand 5268 states and 8596 transitions.
[2020-08-18 13:07:26,394 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-08-18 13:07:26,395 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 13:07:26,399 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]
[2020-08-18 13:07:26,407 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 13:07:26,407 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 13:07:26,407 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 13:07:26,408 INFO  L82        PathProgramCache]: Analyzing trace with hash -567190772, now seen corresponding path program 1 times
[2020-08-18 13:07:26,408 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 13:07:26,408 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765059505]
[2020-08-18 13:07:26,409 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 13:07:26,486 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:27,289 WARN  L193               SmtUtils]: Spent 662.00 ms on a formula simplification that was a NOOP. DAG size: 385
[2020-08-18 13:07:27,290 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 13:07:27,297 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 13:07:27,453 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 13:07:27,453 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765059505]
[2020-08-18 13:07:27,454 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 13:07:27,454 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 13:07:27,454 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524009444]
[2020-08-18 13:07:27,455 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 13:07:27,455 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 13:07:27,456 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 13:07:27,456 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 13:07:27,456 INFO  L87              Difference]: Start difference. First operand 5268 states and 8596 transitions. Second operand 4 states.