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


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 11:31:12,068 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 11:31:12,071 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 11:31:12,095 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 11:31:12,095 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 11:31:12,096 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 11:31:12,097 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 11:31:12,099 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 11:31:12,101 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 11:31:12,102 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 11:31:12,103 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 11:31:12,104 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 11:31:12,104 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 11:31:12,105 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 11:31:12,106 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 11:31:12,107 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 11:31:12,108 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 11:31:12,109 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 11:31:12,111 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 11:31:12,113 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 11:31:12,115 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 11:31:12,116 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 11:31:12,117 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 11:31:12,118 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 11:31:12,121 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 11:31:12,121 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 11:31:12,122 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 11:31:12,122 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 11:31:12,123 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 11:31:12,124 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 11:31:12,124 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 11:31:12,125 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 11:31:12,126 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 11:31:12,126 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 11:31:12,128 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 11:31:12,128 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 11:31:12,129 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 11:31:12,129 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 11:31:12,129 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 11:31:12,130 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 11:31:12,130 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 11:31:12,131 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 11:31:12,160 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 11:31:12,161 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 11:31:12,162 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 11:31:12,162 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 11:31:12,162 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 11:31:12,163 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 11:31:12,163 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 11:31:12,163 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 11:31:12,163 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 11:31:12,163 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 11:31:12,164 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 11:31:12,164 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 11:31:12,164 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 11:31:12,164 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 11:31:12,164 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 11:31:12,165 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 11:31:12,165 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 11:31:12,165 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 11:31:12,165 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 11:31:12,165 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 11:31:12,166 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 11:31:12,166 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 11:31:12,166 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 11:31:12,166 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 11:31:12,167 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 11:31:12,167 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 11:31:12,167 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 11:31:12,167 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 11:31:12,167 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 11:31:12,168 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
[2020-08-18 11:31:12,469 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 11:31:12,483 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 11:31:12,489 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 11:31:12,491 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 11:31:12,491 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 11:31:12,492 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 11:31:12,553 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/04d549275/1152bc1665804da5af56383ada7a8c35/FLAG15b91ca59
[2020-08-18 11:31:13,216 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 11:31:13,217 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 11:31:13,248 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/04d549275/1152bc1665804da5af56383ada7a8c35/FLAG15b91ca59
[2020-08-18 11:31:13,356 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/04d549275/1152bc1665804da5af56383ada7a8c35
[2020-08-18 11:31:13,364 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 11:31:13,366 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 11:31:13,367 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 11:31:13,368 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 11:31:13,374 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 11:31:13,375 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:31:13" (1/1) ...
[2020-08-18 11:31:13,379 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d135d0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:13, skipping insertion in model container
[2020-08-18 11:31:13,379 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 11:31:13" (1/1) ...
[2020-08-18 11:31:13,388 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 11:31:13,594 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 11:31:15,269 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 11:31:15,284 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 11:31:16,958 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 11:31:16,999 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 11:31:17,001 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17 WrapperNode
[2020-08-18 11:31:17,001 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 11:31:17,002 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 11:31:17,002 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 11:31:17,002 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 11:31:17,019 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,020 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,077 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,078 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,158 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,200 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,225 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (1/1) ...
[2020-08-18 11:31:17,247 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 11:31:17,248 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 11:31:17,248 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 11:31:17,248 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 11:31:17,250 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (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 11:31:17,317 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 11:31:17,318 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 11:31:17,318 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 11:31:17,318 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 11:31:17,318 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 11:31:17,319 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-18 11:31:17,319 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uchar
[2020-08-18 11:31:17,319 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 11:31:17,319 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-18 11:31:17,319 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 11:31:17,320 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 11:31:17,320 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-18 11:31:17,320 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-18 11:31:17,320 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-18 11:31:17,321 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-18 11:31:17,321 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-18 11:31:17,321 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-18 11:31:17,321 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-18 11:31:17,321 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-18 11:31:17,322 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-18 11:31:17,322 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 11:31:17,322 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 11:31:17,322 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 11:31:21,637 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 11:31:21,638 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-18 11:31:21,651 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:31:21 BoogieIcfgContainer
[2020-08-18 11:31:21,651 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 11:31:21,653 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 11:31:21,653 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 11:31:21,656 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 11:31:21,657 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 11:31:13" (1/3) ...
[2020-08-18 11:31:21,657 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31f236d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:31:21, skipping insertion in model container
[2020-08-18 11:31:21,658 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 11:31:17" (2/3) ...
[2020-08-18 11:31:21,658 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31f236d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 11:31:21, skipping insertion in model container
[2020-08-18 11:31:21,658 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 11:31:21" (3/3) ...
[2020-08-18 11:31:21,660 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.UNBOUNDED.pals.c.v+lhb-reducer.c
[2020-08-18 11:31:21,671 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 11:31:21,680 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations.
[2020-08-18 11:31:21,694 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2020-08-18 11:31:21,724 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 11:31:21,725 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 11:31:21,725 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 11:31:21,725 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 11:31:21,725 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 11:31:21,725 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 11:31:21,725 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 11:31:21,725 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 11:31:21,766 INFO  L276                IsEmpty]: Start isEmpty. Operand 1506 states.
[2020-08-18 11:31:21,818 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 494
[2020-08-18 11:31:21,818 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 11:31:21,820 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 11:31:21,820 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 11:31:21,826 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 11:31:21,827 INFO  L82        PathProgramCache]: Analyzing trace with hash 1738290825, now seen corresponding path program 1 times
[2020-08-18 11:31:21,835 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 11:31:21,836 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [549636883]
[2020-08-18 11:31:21,836 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 11:31:23,492 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:31:25,171 WARN  L193               SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 400
[2020-08-18 11:31:25,173 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 11:31:25,183 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:31:25,862 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 11:31:25,863 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [549636883]
[2020-08-18 11:31:25,865 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 11:31:25,865 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-18 11:31:25,866 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825000321]
[2020-08-18 11:31:25,873 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-18 11:31:25,873 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 11:31:25,888 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-18 11:31:25,889 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-18 11:31:25,891 INFO  L87              Difference]: Start difference. First operand 1506 states. Second operand 5 states.
[2020-08-18 11:31:42,662 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 11:31:42,662 INFO  L93              Difference]: Finished difference Result 4460 states and 8053 transitions.
[2020-08-18 11:31:42,663 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-18 11:31:42,665 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 493
[2020-08-18 11:31:42,667 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 11:31:42,708 INFO  L225             Difference]: With dead ends: 4460
[2020-08-18 11:31:42,708 INFO  L226             Difference]: Without dead ends: 2963
[2020-08-18 11:31:42,721 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 11:31:42,748 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2963 states.
[2020-08-18 11:31:42,938 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2963 to 2906.
[2020-08-18 11:31:42,940 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2906 states.
[2020-08-18 11:31:42,953 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2906 states to 2906 states and 4772 transitions.
[2020-08-18 11:31:42,955 INFO  L78                 Accepts]: Start accepts. Automaton has 2906 states and 4772 transitions. Word has length 493
[2020-08-18 11:31:42,956 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 11:31:42,956 INFO  L479      AbstractCegarLoop]: Abstraction has 2906 states and 4772 transitions.
[2020-08-18 11:31:42,957 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-18 11:31:42,957 INFO  L276                IsEmpty]: Start isEmpty. Operand 2906 states and 4772 transitions.
[2020-08-18 11:31:42,973 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 496
[2020-08-18 11:31:42,974 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 11:31:42,974 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 11:31:42,975 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 11:31:42,975 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 11:31:42,975 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 11:31:42,976 INFO  L82        PathProgramCache]: Analyzing trace with hash -1236769392, now seen corresponding path program 1 times
[2020-08-18 11:31:42,976 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 11:31:42,976 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1529558506]
[2020-08-18 11:31:42,977 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 11:31:43,265 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:31:44,704 WARN  L193               SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 400
[2020-08-18 11:31:44,707 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 11:31:44,717 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:31:45,208 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 11:31:45,208 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1529558506]
[2020-08-18 11:31:45,209 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 11:31:45,209 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 11:31:45,209 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178167137]
[2020-08-18 11:31:45,212 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 11:31:45,212 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 11:31:45,212 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 11:31:45,213 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 11:31:45,213 INFO  L87              Difference]: Start difference. First operand 2906 states and 4772 transitions. Second operand 4 states.
[2020-08-18 11:32:05,941 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 11:32:05,941 INFO  L93              Difference]: Finished difference Result 8439 states and 13819 transitions.
[2020-08-18 11:32:05,942 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 11:32:05,942 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 495
[2020-08-18 11:32:05,944 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 11:32:05,974 INFO  L225             Difference]: With dead ends: 8439
[2020-08-18 11:32:05,975 INFO  L226             Difference]: Without dead ends: 5747
[2020-08-18 11:32:05,982 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 11:32:05,990 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5747 states.
[2020-08-18 11:32:06,184 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5747 to 5692.
[2020-08-18 11:32:06,184 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5692 states.
[2020-08-18 11:32:06,204 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5692 states to 5692 states and 9324 transitions.
[2020-08-18 11:32:06,205 INFO  L78                 Accepts]: Start accepts. Automaton has 5692 states and 9324 transitions. Word has length 495
[2020-08-18 11:32:06,207 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 11:32:06,207 INFO  L479      AbstractCegarLoop]: Abstraction has 5692 states and 9324 transitions.
[2020-08-18 11:32:06,207 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 11:32:06,208 INFO  L276                IsEmpty]: Start isEmpty. Operand 5692 states and 9324 transitions.
[2020-08-18 11:32:06,233 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 497
[2020-08-18 11:32:06,234 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 11:32:06,234 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 11:32:06,235 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 11:32:06,236 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 11:32:06,240 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 11:32:06,241 INFO  L82        PathProgramCache]: Analyzing trace with hash -1780546784, now seen corresponding path program 1 times
[2020-08-18 11:32:06,241 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 11:32:06,242 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15019091]
[2020-08-18 11:32:06,242 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 11:32:06,377 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:32:07,333 WARN  L193               SmtUtils]: Spent 793.00 ms on a formula simplification that was a NOOP. DAG size: 400
[2020-08-18 11:32:07,335 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 11:32:07,343 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 11:32:07,505 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 11:32:07,506 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15019091]
[2020-08-18 11:32:07,506 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 11:32:07,506 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 11:32:07,507 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715434461]
[2020-08-18 11:32:07,508 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 11:32:07,508 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 11:32:07,508 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 11:32:07,509 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 11:32:07,509 INFO  L87              Difference]: Start difference. First operand 5692 states and 9324 transitions. Second operand 4 states.