/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 16:53:39,653 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 16:53:39,658 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 16:53:39,693 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 16:53:39,694 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 16:53:39,698 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 16:53:39,701 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-20 16:53:39,715 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-20 16:53:39,719 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-20 16:53:39,720 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-20 16:53:39,722 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-07-20 16:53:39,723 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-20 16:53:39,724 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 16:53:39,725 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 16:53:39,727 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 16:53:39,729 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 16:53:39,731 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 16:53:39,732 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 16:53:39,735 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 16:53:39,738 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 16:53:39,740 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 16:53:39,742 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 16:53:39,744 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 16:53:39,746 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 16:53:39,750 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 16:53:39,751 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 16:53:39,751 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 16:53:39,753 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 16:53:39,753 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 16:53:39,755 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 16:53:39,755 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-20 16:53:39,758 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-07-20 16:53:39,759 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-07-20 16:53:39,761 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-20 16:53:39,762 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-07-20 16:53:39,763 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-07-20 16:53:39,763 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 16:53:39,766 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 16:53:39,768 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-07-20 16:53:39,788 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 16:53:39,789 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 16:53:39,791 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 16:53:39,792 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 16:53:39,792 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 16:53:39,792 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 16:53:39,793 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 16:53:39,793 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 16:53:39,793 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 16:53:39,793 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 16:53:39,794 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 16:53:39,794 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 16:53:39,794 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 16:53:39,794 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 16:53:39,794 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 16:53:39,795 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 16:53:39,795 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 16:53:39,795 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 16:53:39,795 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 16:53:39,795 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 16:53:39,796 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 16:53:39,796 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 16:53:39,796 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 16:53:39,796 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 16:53:39,797 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 16:53:39,797 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 16:53:39,797 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:39,797 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 16:53:39,797 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 16:53:39,798 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 -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-20 16:53:40,297 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 16:53:40,318 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 16:53:40,323 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 16:53:40,326 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 16:53:40,327 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 16:53:40,328 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c
[2020-07-20 16:53:40,435 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089/FLAG970d22132
[2020-07-20 16:53:41,211 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 16:53:41,214 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c
[2020-07-20 16:53:41,229 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089/FLAG970d22132
[2020-07-20 16:53:41,517 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/36b13c239/f7737116c15844bf9f78349e470fe089
[2020-07-20 16:53:41,538 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 16:53:41,545 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 16:53:41,547 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 16:53:41,547 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 16:53:41,554 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 16:53:41,557 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:41,563 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9a1b7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41, skipping insertion in model container
[2020-07-20 16:53:41,564 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:41,579 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 16:53:41,612 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 16:53:41,921 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 16:53:41,931 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 16:53:41,959 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 16:53:41,987 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 16:53:41,988 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41 WrapperNode
[2020-07-20 16:53:41,988 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 16:53:41,990 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 16:53:41,991 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 16:53:41,991 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 16:53:42,018 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,019 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,029 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,030 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,167 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,174 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,183 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
[2020-07-20 16:53:42,193 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 16:53:42,195 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 16:53:42,195 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 16:53:42,196 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 16:53:42,199 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (1/1) ...
No working directory specified, using /storage/repos/ultimate/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
[2020-07-20 16:53:42,317 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 16:53:42,317 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 16:53:42,317 INFO  L138     BoogieDeclarations]: Found implementation of procedure fibo1
[2020-07-20 16:53:42,318 INFO  L138     BoogieDeclarations]: Found implementation of procedure fibo2
[2020-07-20 16:53:42,318 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 16:53:42,318 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-20 16:53:42,319 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 16:53:42,319 INFO  L130     BoogieDeclarations]: Found specification of procedure fibo1
[2020-07-20 16:53:42,319 INFO  L130     BoogieDeclarations]: Found specification of procedure fibo2
[2020-07-20 16:53:42,319 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 16:53:42,319 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 16:53:42,320 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 16:53:42,655 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 16:53:42,655 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 16:53:42,664 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:53:42 BoogieIcfgContainer
[2020-07-20 16:53:42,665 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 16:53:42,667 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 16:53:42,667 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 16:53:42,673 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 16:53:42,674 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:53:41" (1/3) ...
[2020-07-20 16:53:42,676 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@795651fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:53:42, skipping insertion in model container
[2020-07-20 16:53:42,676 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:53:41" (2/3) ...
[2020-07-20 16:53:42,677 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@795651fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:53:42, skipping insertion in model container
[2020-07-20 16:53:42,677 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:53:42" (3/3) ...
[2020-07-20 16:53:42,681 INFO  L109   eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c
[2020-07-20 16:53:42,724 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 16:53:42,775 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 16:53:42,819 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 16:53:42,870 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 16:53:42,871 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 16:53:42,871 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 16:53:42,871 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 16:53:42,871 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 16:53:42,871 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 16:53:42,872 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 16:53:42,872 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 16:53:42,906 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states.
[2020-07-20 16:53:42,917 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-07-20 16:53:42,918 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:42,926 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:42,931 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:42,945 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:42,946 INFO  L82        PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times
[2020-07-20 16:53:42,959 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:42,960 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7565219]
[2020-07-20 16:53:42,961 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:43,072 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:43,073 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:43,077 INFO  L263         TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 16:53:43,086 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:43,221 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 16:53:43,222 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 16:53:43,224 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7565219]
[2020-07-20 16:53:43,226 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 16:53:43,226 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 16:53:43,228 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636494916]
[2020-07-20 16:53:43,238 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 16:53:43,239 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:43,260 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 16:53:43,262 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 16:53:43,266 INFO  L87              Difference]: Start difference. First operand 33 states. Second operand 5 states.
[2020-07-20 16:53:43,479 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:43,480 INFO  L93              Difference]: Finished difference Result 44 states and 53 transitions.
[2020-07-20 16:53:43,483 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 16:53:43,486 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-07-20 16:53:43,487 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:43,513 INFO  L225             Difference]: With dead ends: 44
[2020-07-20 16:53:43,514 INFO  L226             Difference]: Without dead ends: 30
[2020-07-20 16:53:43,520 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-07-20 16:53:43,547 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 30 states.
[2020-07-20 16:53:43,593 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30.
[2020-07-20 16:53:43,596 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30 states.
[2020-07-20 16:53:43,599 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions.
[2020-07-20 16:53:43,602 INFO  L78                 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13
[2020-07-20 16:53:43,603 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:43,604 INFO  L479      AbstractCegarLoop]: Abstraction has 30 states and 37 transitions.
[2020-07-20 16:53:43,604 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 16:53:43,605 INFO  L276                IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions.
[2020-07-20 16:53:43,607 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-07-20 16:53:43,608 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:43,608 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:43,823 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:43,823 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:43,824 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:43,824 INFO  L82        PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times
[2020-07-20 16:53:43,825 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:43,825 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999469130]
[2020-07-20 16:53:43,826 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:43,872 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:43,872 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:43,874 INFO  L263         TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 16:53:43,876 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:43,952 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 16:53:43,958 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 16:53:43,959 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999469130]
[2020-07-20 16:53:43,959 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 16:53:43,960 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 16:53:43,960 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785981007]
[2020-07-20 16:53:43,967 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 16:53:43,968 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:43,969 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 16:53:43,970 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 16:53:43,972 INFO  L87              Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states.
[2020-07-20 16:53:44,139 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:44,140 INFO  L93              Difference]: Finished difference Result 36 states and 44 transitions.
[2020-07-20 16:53:44,141 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 16:53:44,141 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 14
[2020-07-20 16:53:44,141 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:44,143 INFO  L225             Difference]: With dead ends: 36
[2020-07-20 16:53:44,144 INFO  L226             Difference]: Without dead ends: 32
[2020-07-20 16:53:44,146 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-07-20 16:53:44,147 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 32 states.
[2020-07-20 16:53:44,157 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30.
[2020-07-20 16:53:44,158 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 30 states.
[2020-07-20 16:53:44,160 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions.
[2020-07-20 16:53:44,160 INFO  L78                 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14
[2020-07-20 16:53:44,161 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:44,161 INFO  L479      AbstractCegarLoop]: Abstraction has 30 states and 37 transitions.
[2020-07-20 16:53:44,161 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 16:53:44,161 INFO  L276                IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions.
[2020-07-20 16:53:44,163 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-07-20 16:53:44,164 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:44,164 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:44,371 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:44,373 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:44,374 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:44,375 INFO  L82        PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times
[2020-07-20 16:53:44,376 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:44,376 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018507024]
[2020-07-20 16:53:44,377 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:44,424 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:44,425 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:44,427 INFO  L263         TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 16:53:44,431 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:44,596 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-07-20 16:53:44,597 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:44,968 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:44,979 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:45,104 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-07-20 16:53:45,105 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018507024]
[2020-07-20 16:53:45,107 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:45,107 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10
[2020-07-20 16:53:45,108 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979530970]
[2020-07-20 16:53:45,109 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-07-20 16:53:45,109 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:45,110 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-07-20 16:53:45,111 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90
[2020-07-20 16:53:45,111 INFO  L87              Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states.
[2020-07-20 16:53:45,374 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:45,377 INFO  L93              Difference]: Finished difference Result 41 states and 52 transitions.
[2020-07-20 16:53:45,380 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-07-20 16:53:45,380 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 26
[2020-07-20 16:53:45,383 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:45,393 INFO  L225             Difference]: With dead ends: 41
[2020-07-20 16:53:45,395 INFO  L226             Difference]: Without dead ends: 37
[2020-07-20 16:53:45,397 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:45,398 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 37 states.
[2020-07-20 16:53:45,433 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35.
[2020-07-20 16:53:45,437 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 35 states.
[2020-07-20 16:53:45,441 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions.
[2020-07-20 16:53:45,445 INFO  L78                 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26
[2020-07-20 16:53:45,446 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:45,446 INFO  L479      AbstractCegarLoop]: Abstraction has 35 states and 45 transitions.
[2020-07-20 16:53:45,447 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-07-20 16:53:45,447 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions.
[2020-07-20 16:53:45,452 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 16:53:45,456 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:45,458 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:45,673 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:45,673 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:45,674 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:45,674 INFO  L82        PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times
[2020-07-20 16:53:45,676 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:45,676 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746931291]
[2020-07-20 16:53:45,677 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:45,773 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:45,773 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:45,775 INFO  L263         TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 16:53:45,778 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:45,843 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-07-20 16:53:45,844 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:46,065 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:46,069 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:46,121 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-07-20 16:53:46,122 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746931291]
[2020-07-20 16:53:46,122 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:46,123 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10
[2020-07-20 16:53:46,123 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943544578]
[2020-07-20 16:53:46,124 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-07-20 16:53:46,124 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:46,125 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-07-20 16:53:46,126 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90
[2020-07-20 16:53:46,126 INFO  L87              Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states.
[2020-07-20 16:53:46,322 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:46,323 INFO  L93              Difference]: Finished difference Result 46 states and 62 transitions.
[2020-07-20 16:53:46,324 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-07-20 16:53:46,324 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 27
[2020-07-20 16:53:46,325 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:46,327 INFO  L225             Difference]: With dead ends: 46
[2020-07-20 16:53:46,328 INFO  L226             Difference]: Without dead ends: 42
[2020-07-20 16:53:46,329 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:46,329 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 42 states.
[2020-07-20 16:53:46,339 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35.
[2020-07-20 16:53:46,340 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 35 states.
[2020-07-20 16:53:46,342 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions.
[2020-07-20 16:53:46,342 INFO  L78                 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27
[2020-07-20 16:53:46,343 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:46,343 INFO  L479      AbstractCegarLoop]: Abstraction has 35 states and 45 transitions.
[2020-07-20 16:53:46,344 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-07-20 16:53:46,344 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions.
[2020-07-20 16:53:46,346 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 40
[2020-07-20 16:53:46,346 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:46,346 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:46,560 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:46,561 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:46,562 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:46,562 INFO  L82        PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times
[2020-07-20 16:53:46,563 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:46,563 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039289771]
[2020-07-20 16:53:46,563 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:46,616 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:46,617 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:46,618 INFO  L263         TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:53:46,622 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:46,728 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2020-07-20 16:53:46,729 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:47,109 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:47,196 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:47,198 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:47,277 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2020-07-20 16:53:47,278 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039289771]
[2020-07-20 16:53:47,279 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:47,279 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12
[2020-07-20 16:53:47,279 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759290753]
[2020-07-20 16:53:47,280 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 16:53:47,281 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:47,281 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 16:53:47,282 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:47,282 INFO  L87              Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states.
[2020-07-20 16:53:47,546 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:47,547 INFO  L93              Difference]: Finished difference Result 51 states and 72 transitions.
[2020-07-20 16:53:47,550 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:53:47,550 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 39
[2020-07-20 16:53:47,551 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:47,553 INFO  L225             Difference]: With dead ends: 51
[2020-07-20 16:53:47,554 INFO  L226             Difference]: Without dead ends: 47
[2020-07-20 16:53:47,555 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210
[2020-07-20 16:53:47,556 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 47 states.
[2020-07-20 16:53:47,567 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40.
[2020-07-20 16:53:47,567 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 40 states.
[2020-07-20 16:53:47,569 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions.
[2020-07-20 16:53:47,570 INFO  L78                 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39
[2020-07-20 16:53:47,571 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:47,571 INFO  L479      AbstractCegarLoop]: Abstraction has 40 states and 54 transitions.
[2020-07-20 16:53:47,571 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 16:53:47,571 INFO  L276                IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions.
[2020-07-20 16:53:47,574 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 41
[2020-07-20 16:53:47,574 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:47,574 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:47,793 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:47,794 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:47,794 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:47,795 INFO  L82        PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times
[2020-07-20 16:53:47,796 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:47,796 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352427261]
[2020-07-20 16:53:47,797 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:47,839 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:53:47,839 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:47,841 INFO  L263         TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:53:47,844 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:47,931 INFO  L134       CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2020-07-20 16:53:47,931 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:48,320 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:48,323 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:48,372 INFO  L134       CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2020-07-20 16:53:48,373 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352427261]
[2020-07-20 16:53:48,374 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:48,374 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12
[2020-07-20 16:53:48,374 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767351447]
[2020-07-20 16:53:48,375 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 16:53:48,375 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:48,376 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 16:53:48,376 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:48,377 INFO  L87              Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states.
[2020-07-20 16:53:48,817 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:48,818 INFO  L93              Difference]: Finished difference Result 84 states and 136 transitions.
[2020-07-20 16:53:48,819 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:53:48,820 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 40
[2020-07-20 16:53:48,821 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:48,832 INFO  L225             Difference]: With dead ends: 84
[2020-07-20 16:53:48,832 INFO  L226             Difference]: Without dead ends: 50
[2020-07-20 16:53:48,835 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:53:48,836 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 50 states.
[2020-07-20 16:53:48,857 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47.
[2020-07-20 16:53:48,858 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 47 states.
[2020-07-20 16:53:48,863 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions.
[2020-07-20 16:53:48,865 INFO  L78                 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40
[2020-07-20 16:53:48,866 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:48,866 INFO  L479      AbstractCegarLoop]: Abstraction has 47 states and 67 transitions.
[2020-07-20 16:53:48,867 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 16:53:48,867 INFO  L276                IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions.
[2020-07-20 16:53:48,871 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2020-07-20 16:53:48,871 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:48,872 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:49,087 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:49,088 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:49,089 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:49,089 INFO  L82        PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times
[2020-07-20 16:53:49,090 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:49,092 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428257912]
[2020-07-20 16:53:49,092 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:49,169 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:49,169 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:49,171 INFO  L263         TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:53:49,175 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:49,248 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2020-07-20 16:53:49,249 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:49,557 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:49,635 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:49,712 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2020-07-20 16:53:49,713 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428257912]
[2020-07-20 16:53:49,713 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:49,714 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12
[2020-07-20 16:53:49,714 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676597480]
[2020-07-20 16:53:49,715 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 16:53:49,716 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:49,716 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 16:53:49,717 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:49,717 INFO  L87              Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states.
[2020-07-20 16:53:49,977 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:49,978 INFO  L93              Difference]: Finished difference Result 63 states and 99 transitions.
[2020-07-20 16:53:49,978 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:53:49,979 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 41
[2020-07-20 16:53:49,979 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:49,982 INFO  L225             Difference]: With dead ends: 63
[2020-07-20 16:53:49,982 INFO  L226             Difference]: Without dead ends: 59
[2020-07-20 16:53:49,984 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210
[2020-07-20 16:53:49,985 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 59 states.
[2020-07-20 16:53:49,997 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51.
[2020-07-20 16:53:49,998 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 51 states.
[2020-07-20 16:53:50,000 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions.
[2020-07-20 16:53:50,001 INFO  L78                 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41
[2020-07-20 16:53:50,002 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:50,002 INFO  L479      AbstractCegarLoop]: Abstraction has 51 states and 77 transitions.
[2020-07-20 16:53:50,002 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 16:53:50,002 INFO  L276                IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions.
[2020-07-20 16:53:50,006 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 54
[2020-07-20 16:53:50,011 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:50,011 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:50,212 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:50,213 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:50,214 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:50,214 INFO  L82        PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times
[2020-07-20 16:53:50,215 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:50,215 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720468135]
[2020-07-20 16:53:50,215 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:50,271 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:50,272 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:50,274 INFO  L263         TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 16:53:50,278 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:50,389 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked.
[2020-07-20 16:53:50,390 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:50,593 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:50,671 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:50,754 INFO  L134       CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked.
[2020-07-20 16:53:50,755 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720468135]
[2020-07-20 16:53:50,755 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:50,755 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10
[2020-07-20 16:53:50,756 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22649805]
[2020-07-20 16:53:50,757 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-07-20 16:53:50,758 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:50,758 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-07-20 16:53:50,759 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90
[2020-07-20 16:53:50,759 INFO  L87              Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states.
[2020-07-20 16:53:50,948 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:50,949 INFO  L93              Difference]: Finished difference Result 65 states and 105 transitions.
[2020-07-20 16:53:50,949 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-07-20 16:53:50,950 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 53
[2020-07-20 16:53:50,951 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:50,953 INFO  L225             Difference]: With dead ends: 65
[2020-07-20 16:53:50,953 INFO  L226             Difference]: Without dead ends: 61
[2020-07-20 16:53:50,955 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:50,956 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 61 states.
[2020-07-20 16:53:50,969 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53.
[2020-07-20 16:53:50,970 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 53 states.
[2020-07-20 16:53:50,972 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions.
[2020-07-20 16:53:50,973 INFO  L78                 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53
[2020-07-20 16:53:50,973 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:50,974 INFO  L479      AbstractCegarLoop]: Abstraction has 53 states and 82 transitions.
[2020-07-20 16:53:50,974 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-07-20 16:53:50,974 INFO  L276                IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions.
[2020-07-20 16:53:50,978 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 79
[2020-07-20 16:53:50,978 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:50,979 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:51,194 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:51,195 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:51,196 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:51,196 INFO  L82        PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times
[2020-07-20 16:53:51,197 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:51,198 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380169843]
[2020-07-20 16:53:51,198 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:51,265 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:51,266 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:51,268 INFO  L263         TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core
[2020-07-20 16:53:51,272 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:51,372 INFO  L134       CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked.
[2020-07-20 16:53:51,372 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:51,800 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:51,802 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:51,924 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:51,925 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:51,985 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:51,987 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:52,055 INFO  L134       CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked.
[2020-07-20 16:53:52,056 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [380169843]
[2020-07-20 16:53:52,056 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:52,057 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14
[2020-07-20 16:53:52,057 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678227588]
[2020-07-20 16:53:52,058 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-07-20 16:53:52,058 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:52,059 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-07-20 16:53:52,059 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182
[2020-07-20 16:53:52,059 INFO  L87              Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states.
[2020-07-20 16:53:52,305 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:52,305 INFO  L93              Difference]: Finished difference Result 75 states and 134 transitions.
[2020-07-20 16:53:52,306 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-07-20 16:53:52,306 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 78
[2020-07-20 16:53:52,307 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:52,309 INFO  L225             Difference]: With dead ends: 75
[2020-07-20 16:53:52,309 INFO  L226             Difference]: Without dead ends: 71
[2020-07-20 16:53:52,310 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306
[2020-07-20 16:53:52,310 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 71 states.
[2020-07-20 16:53:52,323 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56.
[2020-07-20 16:53:52,324 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 56 states.
[2020-07-20 16:53:52,325 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions.
[2020-07-20 16:53:52,325 INFO  L78                 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78
[2020-07-20 16:53:52,326 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:52,326 INFO  L479      AbstractCegarLoop]: Abstraction has 56 states and 90 transitions.
[2020-07-20 16:53:52,326 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-07-20 16:53:52,327 INFO  L276                IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions.
[2020-07-20 16:53:52,329 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 68
[2020-07-20 16:53:52,330 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:52,330 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:52,543 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:52,545 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:52,545 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:52,546 INFO  L82        PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times
[2020-07-20 16:53:52,546 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:52,547 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869925022]
[2020-07-20 16:53:52,547 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:52,599 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:53:52,599 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:52,600 INFO  L263         TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:53:52,604 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:52,673 INFO  L134       CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked.
[2020-07-20 16:53:52,674 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:53,063 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:53,065 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:53,095 INFO  L134       CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2020-07-20 16:53:53,096 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869925022]
[2020-07-20 16:53:53,096 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:53,097 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12
[2020-07-20 16:53:53,097 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672967375]
[2020-07-20 16:53:53,098 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 16:53:53,098 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:53,098 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 16:53:53,099 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:53:53,099 INFO  L87              Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states.
[2020-07-20 16:53:53,344 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:53,345 INFO  L93              Difference]: Finished difference Result 114 states and 219 transitions.
[2020-07-20 16:53:53,349 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:53:53,350 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 67
[2020-07-20 16:53:53,350 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:53,352 INFO  L225             Difference]: With dead ends: 114
[2020-07-20 16:53:53,353 INFO  L226             Difference]: Without dead ends: 64
[2020-07-20 16:53:53,355 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:53:53,357 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 64 states.
[2020-07-20 16:53:53,368 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61.
[2020-07-20 16:53:53,369 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 61 states.
[2020-07-20 16:53:53,371 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions.
[2020-07-20 16:53:53,371 INFO  L78                 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67
[2020-07-20 16:53:53,372 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:53,372 INFO  L479      AbstractCegarLoop]: Abstraction has 61 states and 101 transitions.
[2020-07-20 16:53:53,372 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 16:53:53,373 INFO  L276                IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions.
[2020-07-20 16:53:53,375 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 69
[2020-07-20 16:53:53,375 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:53,376 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:53,590 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:53,591 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:53,592 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:53,592 INFO  L82        PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times
[2020-07-20 16:53:53,593 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:53,593 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55472330]
[2020-07-20 16:53:53,593 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:53,658 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:53:53,659 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:53,661 INFO  L263         TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 16:53:53,665 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:53,804 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked.
[2020-07-20 16:53:53,805 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:54,170 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:54,477 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:54,479 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:54,538 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:54,587 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked.
[2020-07-20 16:53:54,588 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55472330]
[2020-07-20 16:53:54,589 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:54,589 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17
[2020-07-20 16:53:54,589 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560963926]
[2020-07-20 16:53:54,590 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-07-20 16:53:54,590 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:54,591 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-07-20 16:53:54,591 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:53:54,591 INFO  L87              Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states.
[2020-07-20 16:53:55,165 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:55,166 INFO  L93              Difference]: Finished difference Result 131 states and 252 transitions.
[2020-07-20 16:53:55,166 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-07-20 16:53:55,167 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 68
[2020-07-20 16:53:55,168 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:55,170 INFO  L225             Difference]: With dead ends: 131
[2020-07-20 16:53:55,172 INFO  L226             Difference]: Without dead ends: 76
[2020-07-20 16:53:55,175 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650
[2020-07-20 16:53:55,177 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 76 states.
[2020-07-20 16:53:55,208 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68.
[2020-07-20 16:53:55,209 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 68 states.
[2020-07-20 16:53:55,215 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions.
[2020-07-20 16:53:55,217 INFO  L78                 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68
[2020-07-20 16:53:55,220 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:55,221 INFO  L479      AbstractCegarLoop]: Abstraction has 68 states and 106 transitions.
[2020-07-20 16:53:55,221 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-07-20 16:53:55,221 INFO  L276                IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions.
[2020-07-20 16:53:55,229 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 83
[2020-07-20 16:53:55,229 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:55,230 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:55,447 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:55,447 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:55,448 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:55,448 INFO  L82        PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times
[2020-07-20 16:53:55,449 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:55,449 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091138764]
[2020-07-20 16:53:55,450 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:55,523 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:53:55,524 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:55,526 INFO  L263         TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core
[2020-07-20 16:53:55,530 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:55,712 INFO  L134       CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked.
[2020-07-20 16:53:55,713 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:56,248 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,249 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,308 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,310 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,370 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,392 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,653 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,715 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,716 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:56,768 INFO  L134       CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked.
[2020-07-20 16:53:56,769 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091138764]
[2020-07-20 16:53:56,769 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:56,769 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21
[2020-07-20 16:53:56,769 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397167978]
[2020-07-20 16:53:56,770 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 16:53:56,771 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:56,771 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 16:53:56,771 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420
[2020-07-20 16:53:56,772 INFO  L87              Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states.
[2020-07-20 16:53:58,001 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:58,001 INFO  L93              Difference]: Finished difference Result 186 states and 366 transitions.
[2020-07-20 16:53:58,002 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. 
[2020-07-20 16:53:58,003 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 82
[2020-07-20 16:53:58,003 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:58,011 INFO  L225             Difference]: With dead ends: 186
[2020-07-20 16:53:58,012 INFO  L226             Difference]: Without dead ends: 124
[2020-07-20 16:53:58,015 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482
[2020-07-20 16:53:58,016 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 124 states.
[2020-07-20 16:53:58,078 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110.
[2020-07-20 16:53:58,079 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 110 states.
[2020-07-20 16:53:58,086 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions.
[2020-07-20 16:53:58,089 INFO  L78                 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82
[2020-07-20 16:53:58,090 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:58,091 INFO  L479      AbstractCegarLoop]: Abstraction has 110 states and 179 transitions.
[2020-07-20 16:53:58,091 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 16:53:58,091 INFO  L276                IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions.
[2020-07-20 16:53:58,093 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 69
[2020-07-20 16:53:58,094 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:58,094 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:58,309 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:58,310 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:58,311 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:58,311 INFO  L82        PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times
[2020-07-20 16:53:58,311 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:58,312 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273223694]
[2020-07-20 16:53:58,312 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:58,387 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:53:58,388 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:58,389 INFO  L263         TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core
[2020-07-20 16:53:58,392 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:58,489 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked.
[2020-07-20 16:53:58,490 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:53:58,883 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:58,986 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:58,988 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:59,042 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:53:59,089 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2020-07-20 16:53:59,090 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273223694]
[2020-07-20 16:53:59,090 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:53:59,090 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13
[2020-07-20 16:53:59,091 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261541765]
[2020-07-20 16:53:59,092 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-07-20 16:53:59,092 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:53:59,093 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-07-20 16:53:59,094 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156
[2020-07-20 16:53:59,094 INFO  L87              Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 13 states.
[2020-07-20 16:53:59,369 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:53:59,370 INFO  L93              Difference]: Finished difference Result 114 states and 182 transitions.
[2020-07-20 16:53:59,373 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-07-20 16:53:59,373 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 68
[2020-07-20 16:53:59,374 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:53:59,376 INFO  L225             Difference]: With dead ends: 114
[2020-07-20 16:53:59,377 INFO  L226             Difference]: Without dead ends: 110
[2020-07-20 16:53:59,378 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:53:59,379 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 110 states.
[2020-07-20 16:53:59,391 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102.
[2020-07-20 16:53:59,392 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 102 states.
[2020-07-20 16:53:59,395 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions.
[2020-07-20 16:53:59,395 INFO  L78                 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68
[2020-07-20 16:53:59,396 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:53:59,396 INFO  L479      AbstractCegarLoop]: Abstraction has 102 states and 159 transitions.
[2020-07-20 16:53:59,397 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-07-20 16:53:59,397 INFO  L276                IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions.
[2020-07-20 16:53:59,400 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 95
[2020-07-20 16:53:59,401 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:53:59,404 INFO  L422         BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:53:59,619 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:59,619 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:53:59,620 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:53:59,621 INFO  L82        PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times
[2020-07-20 16:53:59,621 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:53:59,622 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23083399]
[2020-07-20 16:53:59,622 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:53:59,691 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:53:59,692 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:53:59,693 INFO  L263         TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 16:53:59,696 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:53:59,807 INFO  L134       CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked.
[2020-07-20 16:53:59,808 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:00,283 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,347 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,399 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,551 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,552 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,622 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:00,680 INFO  L134       CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked.
[2020-07-20 16:54:00,681 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23083399]
[2020-07-20 16:54:00,682 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:00,682 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19
[2020-07-20 16:54:00,682 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108947901]
[2020-07-20 16:54:00,683 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-07-20 16:54:00,684 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:00,684 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-07-20 16:54:00,684 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342
[2020-07-20 16:54:00,685 INFO  L87              Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states.
[2020-07-20 16:54:01,278 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:01,278 INFO  L93              Difference]: Finished difference Result 269 states and 520 transitions.
[2020-07-20 16:54:01,283 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-07-20 16:54:01,284 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 94
[2020-07-20 16:54:01,284 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:01,287 INFO  L225             Difference]: With dead ends: 269
[2020-07-20 16:54:01,287 INFO  L226             Difference]: Without dead ends: 168
[2020-07-20 16:54:01,290 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870
[2020-07-20 16:54:01,290 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 168 states.
[2020-07-20 16:54:01,304 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144.
[2020-07-20 16:54:01,305 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 144 states.
[2020-07-20 16:54:01,307 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions.
[2020-07-20 16:54:01,308 INFO  L78                 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94
[2020-07-20 16:54:01,308 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:01,308 INFO  L479      AbstractCegarLoop]: Abstraction has 144 states and 247 transitions.
[2020-07-20 16:54:01,309 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-07-20 16:54:01,309 INFO  L276                IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions.
[2020-07-20 16:54:01,311 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 81
[2020-07-20 16:54:01,311 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:01,311 INFO  L422         BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:01,525 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:01,526 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:01,527 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:01,527 INFO  L82        PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times
[2020-07-20 16:54:01,528 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:01,528 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484294541]
[2020-07-20 16:54:01,528 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:01,597 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:54:01,598 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:01,599 INFO  L263         TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:54:01,601 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:01,640 INFO  L134       CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked.
[2020-07-20 16:54:01,640 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:01,872 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:01,911 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:01,912 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:01,952 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:01,981 INFO  L134       CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked.
[2020-07-20 16:54:01,981 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484294541]
[2020-07-20 16:54:01,982 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:01,982 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11
[2020-07-20 16:54:01,982 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816694258]
[2020-07-20 16:54:01,983 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-07-20 16:54:01,983 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:01,983 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-07-20 16:54:01,983 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-07-20 16:54:01,984 INFO  L87              Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 11 states.
[2020-07-20 16:54:02,131 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:02,131 INFO  L93              Difference]: Finished difference Result 167 states and 289 transitions.
[2020-07-20 16:54:02,132 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:54:02,132 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 80
[2020-07-20 16:54:02,132 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:02,135 INFO  L225             Difference]: With dead ends: 167
[2020-07-20 16:54:02,135 INFO  L226             Difference]: Without dead ends: 163
[2020-07-20 16:54:02,136 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182
[2020-07-20 16:54:02,137 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 163 states.
[2020-07-20 16:54:02,150 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157.
[2020-07-20 16:54:02,151 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 157 states.
[2020-07-20 16:54:02,153 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions.
[2020-07-20 16:54:02,153 INFO  L78                 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80
[2020-07-20 16:54:02,154 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:02,154 INFO  L479      AbstractCegarLoop]: Abstraction has 157 states and 272 transitions.
[2020-07-20 16:54:02,154 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-07-20 16:54:02,154 INFO  L276                IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions.
[2020-07-20 16:54:02,157 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 121
[2020-07-20 16:54:02,157 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:02,157 INFO  L422         BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:02,372 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:02,373 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:02,374 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:02,374 INFO  L82        PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times
[2020-07-20 16:54:02,374 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:02,375 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916853384]
[2020-07-20 16:54:02,375 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:02,446 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:02,447 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:02,449 INFO  L263         TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core
[2020-07-20 16:54:02,452 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:02,557 INFO  L134       CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked.
[2020-07-20 16:54:02,558 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:03,502 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:03,503 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:03,559 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:03,830 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:03,886 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:03,955 INFO  L134       CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked.
[2020-07-20 16:54:03,962 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916853384]
[2020-07-20 16:54:03,963 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:03,964 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21
[2020-07-20 16:54:03,964 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608182928]
[2020-07-20 16:54:03,965 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 16:54:03,966 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:03,966 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 16:54:03,967 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420
[2020-07-20 16:54:03,967 INFO  L87              Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states.
[2020-07-20 16:54:04,643 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:04,644 INFO  L93              Difference]: Finished difference Result 369 states and 701 transitions.
[2020-07-20 16:54:04,645 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2020-07-20 16:54:04,645 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 120
[2020-07-20 16:54:04,646 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:04,652 INFO  L225             Difference]: With dead ends: 369
[2020-07-20 16:54:04,653 INFO  L226             Difference]: Without dead ends: 218
[2020-07-20 16:54:04,658 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056
[2020-07-20 16:54:04,659 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 218 states.
[2020-07-20 16:54:04,690 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173.
[2020-07-20 16:54:04,690 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 173 states.
[2020-07-20 16:54:04,695 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions.
[2020-07-20 16:54:04,699 INFO  L78                 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120
[2020-07-20 16:54:04,700 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:04,700 INFO  L479      AbstractCegarLoop]: Abstraction has 173 states and 306 transitions.
[2020-07-20 16:54:04,700 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 16:54:04,700 INFO  L276                IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions.
[2020-07-20 16:54:04,704 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 93
[2020-07-20 16:54:04,705 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:04,705 INFO  L422         BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:04,919 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:04,919 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:04,920 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:04,920 INFO  L82        PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times
[2020-07-20 16:54:04,921 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:04,921 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828206245]
[2020-07-20 16:54:04,922 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:05,008 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:54:05,009 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:05,011 INFO  L263         TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 16:54:05,015 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:05,074 INFO  L134       CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked.
[2020-07-20 16:54:05,074 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:05,327 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:05,328 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:05,379 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:05,450 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:05,529 INFO  L134       CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked.
[2020-07-20 16:54:05,530 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828206245]
[2020-07-20 16:54:05,531 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:05,531 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11
[2020-07-20 16:54:05,531 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537949621]
[2020-07-20 16:54:05,538 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-07-20 16:54:05,539 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:05,540 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-07-20 16:54:05,540 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2020-07-20 16:54:05,541 INFO  L87              Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 11 states.
[2020-07-20 16:54:05,725 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:05,725 INFO  L93              Difference]: Finished difference Result 191 states and 349 transitions.
[2020-07-20 16:54:05,726 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 16:54:05,726 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 92
[2020-07-20 16:54:05,726 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:05,730 INFO  L225             Difference]: With dead ends: 191
[2020-07-20 16:54:05,730 INFO  L226             Difference]: Without dead ends: 187
[2020-07-20 16:54:05,732 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182
[2020-07-20 16:54:05,733 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 187 states.
[2020-07-20 16:54:05,751 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176.
[2020-07-20 16:54:05,751 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 176 states.
[2020-07-20 16:54:05,755 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions.
[2020-07-20 16:54:05,756 INFO  L78                 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92
[2020-07-20 16:54:05,756 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:05,756 INFO  L479      AbstractCegarLoop]: Abstraction has 176 states and 316 transitions.
[2020-07-20 16:54:05,756 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-07-20 16:54:05,757 INFO  L276                IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions.
[2020-07-20 16:54:05,761 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 119
[2020-07-20 16:54:05,761 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:05,762 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:05,975 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:05,975 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:05,976 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:05,976 INFO  L82        PathProgramCache]: Analyzing trace with hash -464279411, now seen corresponding path program 2 times
[2020-07-20 16:54:05,977 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:05,977 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751888612]
[2020-07-20 16:54:05,978 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:06,070 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:06,070 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:06,073 INFO  L263         TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core
[2020-07-20 16:54:06,077 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:06,269 INFO  L134       CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 124 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked.
[2020-07-20 16:54:06,270 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:07,066 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,067 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,146 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,595 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,596 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,714 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,716 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,791 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,793 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:07,841 INFO  L134       CoverageAnalysis]: Checked inductivity of 332 backedges. 70 proven. 130 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked.
[2020-07-20 16:54:07,842 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751888612]
[2020-07-20 16:54:07,842 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:07,843 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21
[2020-07-20 16:54:07,843 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603176746]
[2020-07-20 16:54:07,844 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 16:54:07,844 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:07,844 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 16:54:07,845 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420
[2020-07-20 16:54:07,845 INFO  L87              Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 21 states.
[2020-07-20 16:54:08,735 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:08,736 INFO  L93              Difference]: Finished difference Result 399 states and 796 transitions.
[2020-07-20 16:54:08,737 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. 
[2020-07-20 16:54:08,737 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 118
[2020-07-20 16:54:08,738 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:08,742 INFO  L225             Difference]: With dead ends: 399
[2020-07-20 16:54:08,743 INFO  L226             Difference]: Without dead ends: 226
[2020-07-20 16:54:08,746 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 206 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190
[2020-07-20 16:54:08,747 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 226 states.
[2020-07-20 16:54:08,770 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 192.
[2020-07-20 16:54:08,770 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 192 states.
[2020-07-20 16:54:08,772 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions.
[2020-07-20 16:54:08,773 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 118
[2020-07-20 16:54:08,774 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:08,774 INFO  L479      AbstractCegarLoop]: Abstraction has 192 states and 334 transitions.
[2020-07-20 16:54:08,774 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 16:54:08,774 INFO  L276                IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions.
[2020-07-20 16:54:08,779 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 118
[2020-07-20 16:54:08,779 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:08,780 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:08,993 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:08,995 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:08,996 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:08,996 INFO  L82        PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times
[2020-07-20 16:54:08,996 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:08,997 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177322612]
[2020-07-20 16:54:08,997 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:09,211 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:54:09,212 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:09,214 INFO  L263         TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 16:54:09,219 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:09,328 INFO  L134       CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked.
[2020-07-20 16:54:09,329 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:10,081 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,082 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,250 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,360 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,361 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,416 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:10,461 INFO  L134       CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked.
[2020-07-20 16:54:10,462 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177322612]
[2020-07-20 16:54:10,462 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:10,462 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15
[2020-07-20 16:54:10,462 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484848401]
[2020-07-20 16:54:10,463 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-07-20 16:54:10,463 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:10,463 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-07-20 16:54:10,464 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210
[2020-07-20 16:54:10,464 INFO  L87              Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 15 states.
[2020-07-20 16:54:10,696 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:10,696 INFO  L93              Difference]: Finished difference Result 205 states and 355 transitions.
[2020-07-20 16:54:10,697 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-07-20 16:54:10,697 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 117
[2020-07-20 16:54:10,698 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:10,704 INFO  L225             Difference]: With dead ends: 205
[2020-07-20 16:54:10,704 INFO  L226             Difference]: Without dead ends: 201
[2020-07-20 16:54:10,705 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380
[2020-07-20 16:54:10,706 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 201 states.
[2020-07-20 16:54:10,721 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 192.
[2020-07-20 16:54:10,722 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 192 states.
[2020-07-20 16:54:10,724 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 334 transitions.
[2020-07-20 16:54:10,725 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states and 334 transitions. Word has length 117
[2020-07-20 16:54:10,726 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:10,726 INFO  L479      AbstractCegarLoop]: Abstraction has 192 states and 334 transitions.
[2020-07-20 16:54:10,726 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-07-20 16:54:10,726 INFO  L276                IsEmpty]: Start isEmpty. Operand 192 states and 334 transitions.
[2020-07-20 16:54:10,729 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 121
[2020-07-20 16:54:10,730 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:10,730 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:10,945 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:10,946 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:10,947 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:10,947 INFO  L82        PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times
[2020-07-20 16:54:10,948 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:10,948 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771246713]
[2020-07-20 16:54:10,948 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:11,060 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:11,060 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:11,062 INFO  L263         TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 16:54:11,065 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:11,191 INFO  L134       CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked.
[2020-07-20 16:54:11,191 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:12,152 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:12,154 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:12,522 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:12,600 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:12,685 INFO  L134       CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked.
[2020-07-20 16:54:12,686 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771246713]
[2020-07-20 16:54:12,687 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:12,687 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17
[2020-07-20 16:54:12,687 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287315453]
[2020-07-20 16:54:12,690 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-07-20 16:54:12,691 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:12,692 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-07-20 16:54:12,692 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:54:12,692 INFO  L87              Difference]: Start difference. First operand 192 states and 334 transitions. Second operand 17 states.
[2020-07-20 16:54:13,273 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:13,273 INFO  L93              Difference]: Finished difference Result 364 states and 644 transitions.
[2020-07-20 16:54:13,277 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-07-20 16:54:13,278 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 120
[2020-07-20 16:54:13,279 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:13,284 INFO  L225             Difference]: With dead ends: 364
[2020-07-20 16:54:13,284 INFO  L226             Difference]: Without dead ends: 178
[2020-07-20 16:54:13,288 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650
[2020-07-20 16:54:13,290 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 178 states.
[2020-07-20 16:54:13,309 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 176.
[2020-07-20 16:54:13,310 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 176 states.
[2020-07-20 16:54:13,312 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 287 transitions.
[2020-07-20 16:54:13,313 INFO  L78                 Accepts]: Start accepts. Automaton has 176 states and 287 transitions. Word has length 120
[2020-07-20 16:54:13,314 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:13,314 INFO  L479      AbstractCegarLoop]: Abstraction has 176 states and 287 transitions.
[2020-07-20 16:54:13,314 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-07-20 16:54:13,314 INFO  L276                IsEmpty]: Start isEmpty. Operand 176 states and 287 transitions.
[2020-07-20 16:54:13,318 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 200
[2020-07-20 16:54:13,319 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:13,319 INFO  L422         BasicCegarLoop]: trace histogram [15, 15, 14, 14, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:13,534 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:13,534 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:13,535 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:13,535 INFO  L82        PathProgramCache]: Analyzing trace with hash 495118725, now seen corresponding path program 6 times
[2020-07-20 16:54:13,536 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:13,536 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995563401]
[2020-07-20 16:54:13,538 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:13,732 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:13,733 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:13,737 INFO  L263         TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 18 conjunts are in the unsatisfiable core
[2020-07-20 16:54:13,758 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:14,083 INFO  L134       CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 301 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked.
[2020-07-20 16:54:14,084 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:15,196 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:15,305 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:15,375 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:15,467 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:15,980 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:16,147 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:16,232 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:16,388 INFO  L134       CoverageAnalysis]: Checked inductivity of 1024 backedges. 177 proven. 311 refuted. 0 times theorem prover too weak. 536 trivial. 0 not checked.
[2020-07-20 16:54:16,389 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995563401]
[2020-07-20 16:54:16,389 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:16,390 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25
[2020-07-20 16:54:16,390 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388418718]
[2020-07-20 16:54:16,394 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 25 states
[2020-07-20 16:54:16,395 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:16,395 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2020-07-20 16:54:16,396 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600
[2020-07-20 16:54:16,396 INFO  L87              Difference]: Start difference. First operand 176 states and 287 transitions. Second operand 25 states.
[2020-07-20 16:54:18,159 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:18,160 INFO  L93              Difference]: Finished difference Result 428 states and 843 transitions.
[2020-07-20 16:54:18,161 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. 
[2020-07-20 16:54:18,161 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states. Word has length 199
[2020-07-20 16:54:18,162 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:18,168 INFO  L225             Difference]: With dead ends: 428
[2020-07-20 16:54:18,168 INFO  L226             Difference]: Without dead ends: 256
[2020-07-20 16:54:18,173 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 360 SyntacticMatches, 15 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=1804, Unknown=0, NotChecked=0, Total=2162
[2020-07-20 16:54:18,174 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 256 states.
[2020-07-20 16:54:18,205 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 219.
[2020-07-20 16:54:18,205 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 219 states.
[2020-07-20 16:54:18,208 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 386 transitions.
[2020-07-20 16:54:18,209 INFO  L78                 Accepts]: Start accepts. Automaton has 219 states and 386 transitions. Word has length 199
[2020-07-20 16:54:18,209 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:18,209 INFO  L479      AbstractCegarLoop]: Abstraction has 219 states and 386 transitions.
[2020-07-20 16:54:18,210 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 25 states.
[2020-07-20 16:54:18,210 INFO  L276                IsEmpty]: Start isEmpty. Operand 219 states and 386 transitions.
[2020-07-20 16:54:18,213 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 121
[2020-07-20 16:54:18,213 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:18,214 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:18,427 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:18,428 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:18,429 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:18,429 INFO  L82        PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 7 times
[2020-07-20 16:54:18,430 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:18,430 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005242961]
[2020-07-20 16:54:18,431 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:18,617 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:18,617 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:18,619 INFO  L263         TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core
[2020-07-20 16:54:18,623 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:18,845 INFO  L134       CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked.
[2020-07-20 16:54:18,845 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:19,677 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:19,678 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:19,772 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:19,773 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,285 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,286 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,390 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,455 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,456 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:20,507 INFO  L134       CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked.
[2020-07-20 16:54:20,508 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005242961]
[2020-07-20 16:54:20,508 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:20,508 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21
[2020-07-20 16:54:20,509 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237903469]
[2020-07-20 16:54:20,509 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 16:54:20,510 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:20,510 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 16:54:20,511 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420
[2020-07-20 16:54:20,511 INFO  L87              Difference]: Start difference. First operand 219 states and 386 transitions. Second operand 21 states.
[2020-07-20 16:54:21,344 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:21,344 INFO  L93              Difference]: Finished difference Result 423 states and 796 transitions.
[2020-07-20 16:54:21,349 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2020-07-20 16:54:21,350 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 120
[2020-07-20 16:54:21,351 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:21,358 INFO  L225             Difference]: With dead ends: 423
[2020-07-20 16:54:21,359 INFO  L226             Difference]: Without dead ends: 208
[2020-07-20 16:54:21,367 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056
[2020-07-20 16:54:21,371 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 208 states.
[2020-07-20 16:54:21,395 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 174.
[2020-07-20 16:54:21,396 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 174 states.
[2020-07-20 16:54:21,398 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 278 transitions.
[2020-07-20 16:54:21,399 INFO  L78                 Accepts]: Start accepts. Automaton has 174 states and 278 transitions. Word has length 120
[2020-07-20 16:54:21,400 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:21,400 INFO  L479      AbstractCegarLoop]: Abstraction has 174 states and 278 transitions.
[2020-07-20 16:54:21,400 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 16:54:21,401 INFO  L276                IsEmpty]: Start isEmpty. Operand 174 states and 278 transitions.
[2020-07-20 16:54:21,406 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 122
[2020-07-20 16:54:21,406 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:21,407 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:21,621 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:21,623 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:21,623 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:21,624 INFO  L82        PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 8 times
[2020-07-20 16:54:21,624 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:21,624 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423962548]
[2020-07-20 16:54:21,625 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:21,802 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 16:54:21,803 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:21,806 INFO  L263         TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 36 conjunts are in the unsatisfiable core
[2020-07-20 16:54:21,811 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:22,171 INFO  L134       CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked.
[2020-07-20 16:54:22,171 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:23,225 WARN  L193               SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 77
[2020-07-20 16:54:23,363 WARN  L193               SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 77
[2020-07-20 16:54:23,501 WARN  L193               SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 79
[2020-07-20 16:54:23,627 WARN  L193               SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 79
[2020-07-20 16:54:25,651 INFO  L134       CoverageAnalysis]: Checked inductivity of 346 backedges. 72 proven. 49 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked.
[2020-07-20 16:54:25,652 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423962548]
[2020-07-20 16:54:25,652 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:25,653 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28
[2020-07-20 16:54:25,653 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722844038]
[2020-07-20 16:54:25,654 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 28 states
[2020-07-20 16:54:25,654 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:25,654 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants.
[2020-07-20 16:54:25,655 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756
[2020-07-20 16:54:25,655 INFO  L87              Difference]: Start difference. First operand 174 states and 278 transitions. Second operand 28 states.
[2020-07-20 16:54:25,938 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:25,939 INFO  L93              Difference]: Finished difference Result 208 states and 357 transitions.
[2020-07-20 16:54:25,940 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. 
[2020-07-20 16:54:25,941 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states. Word has length 121
[2020-07-20 16:54:25,941 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:25,946 INFO  L225             Difference]: With dead ends: 208
[2020-07-20 16:54:25,946 INFO  L226             Difference]: Without dead ends: 204
[2020-07-20 16:54:25,948 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 188 SyntacticMatches, 27 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812
[2020-07-20 16:54:25,949 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 204 states.
[2020-07-20 16:54:25,973 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 197.
[2020-07-20 16:54:25,973 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 197 states.
[2020-07-20 16:54:25,977 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 340 transitions.
[2020-07-20 16:54:25,978 INFO  L78                 Accepts]: Start accepts. Automaton has 197 states and 340 transitions. Word has length 121
[2020-07-20 16:54:25,978 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:25,979 INFO  L479      AbstractCegarLoop]: Abstraction has 197 states and 340 transitions.
[2020-07-20 16:54:25,979 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 28 states.
[2020-07-20 16:54:25,979 INFO  L276                IsEmpty]: Start isEmpty. Operand 197 states and 340 transitions.
[2020-07-20 16:54:25,984 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 137
[2020-07-20 16:54:25,984 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:25,985 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:26,199 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:26,200 INFO  L427      AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:26,200 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:26,201 INFO  L82        PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 9 times
[2020-07-20 16:54:26,201 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:26,201 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285583789]
[2020-07-20 16:54:26,202 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:26,377 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 16:54:26,378 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:26,380 INFO  L263         TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core
[2020-07-20 16:54:26,384 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:26,527 INFO  L134       CoverageAnalysis]: Checked inductivity of 437 backedges. 262 proven. 67 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked.
[2020-07-20 16:54:26,527 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:27,380 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:27,857 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:27,858 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:27,971 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:27,973 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:28,037 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:28,038 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:28,102 INFO  L134       CoverageAnalysis]: Checked inductivity of 437 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked.
[2020-07-20 16:54:28,103 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285583789]
[2020-07-20 16:54:28,103 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:28,103 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19
[2020-07-20 16:54:28,104 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98102737]
[2020-07-20 16:54:28,104 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-07-20 16:54:28,104 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:28,105 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-07-20 16:54:28,106 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342
[2020-07-20 16:54:28,106 INFO  L87              Difference]: Start difference. First operand 197 states and 340 transitions. Second operand 19 states.
[2020-07-20 16:54:28,868 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:28,869 INFO  L93              Difference]: Finished difference Result 410 states and 770 transitions.
[2020-07-20 16:54:28,870 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-07-20 16:54:28,871 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 136
[2020-07-20 16:54:28,871 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:28,877 INFO  L225             Difference]: With dead ends: 410
[2020-07-20 16:54:28,877 INFO  L226             Difference]: Without dead ends: 219
[2020-07-20 16:54:28,881 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 241 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=161, Invalid=709, Unknown=0, NotChecked=0, Total=870
[2020-07-20 16:54:28,882 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 219 states.
[2020-07-20 16:54:28,911 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 208.
[2020-07-20 16:54:28,911 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 208 states.
[2020-07-20 16:54:28,915 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 377 transitions.
[2020-07-20 16:54:28,916 INFO  L78                 Accepts]: Start accepts. Automaton has 208 states and 377 transitions. Word has length 136
[2020-07-20 16:54:28,920 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:28,921 INFO  L479      AbstractCegarLoop]: Abstraction has 208 states and 377 transitions.
[2020-07-20 16:54:28,921 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-07-20 16:54:28,921 INFO  L276                IsEmpty]: Start isEmpty. Operand 208 states and 377 transitions.
[2020-07-20 16:54:28,927 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 161
[2020-07-20 16:54:28,927 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:28,928 INFO  L422         BasicCegarLoop]: trace histogram [12, 12, 11, 11, 8, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:29,144 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:29,144 INFO  L427      AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:29,145 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:29,145 INFO  L82        PathProgramCache]: Analyzing trace with hash -892586014, now seen corresponding path program 10 times
[2020-07-20 16:54:29,146 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:29,146 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77054528]
[2020-07-20 16:54:29,147 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:29,323 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 16:54:29,324 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:54:29,326 INFO  L263         TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 16:54:29,331 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:54:29,504 INFO  L134       CoverageAnalysis]: Checked inductivity of 633 backedges. 357 proven. 32 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked.
[2020-07-20 16:54:29,504 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:54:30,639 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:30,641 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:30,942 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:30,998 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:30,999 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 16:54:31,045 INFO  L134       CoverageAnalysis]: Checked inductivity of 633 backedges. 81 proven. 208 refuted. 0 times theorem prover too weak. 344 trivial. 0 not checked.
[2020-07-20 16:54:31,046 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77054528]
[2020-07-20 16:54:31,046 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:54:31,046 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17
[2020-07-20 16:54:31,046 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7210689]
[2020-07-20 16:54:31,047 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-07-20 16:54:31,047 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:54:31,047 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-07-20 16:54:31,049 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272
[2020-07-20 16:54:31,050 INFO  L87              Difference]: Start difference. First operand 208 states and 377 transitions. Second operand 17 states.
[2020-07-20 16:54:31,735 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:54:31,736 INFO  L93              Difference]: Finished difference Result 420 states and 786 transitions.
[2020-07-20 16:54:31,737 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-07-20 16:54:31,738 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 160
[2020-07-20 16:54:31,738 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:54:31,743 INFO  L225             Difference]: With dead ends: 420
[2020-07-20 16:54:31,743 INFO  L226             Difference]: Without dead ends: 217
[2020-07-20 16:54:31,747 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 293 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702
[2020-07-20 16:54:31,748 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 217 states.
[2020-07-20 16:54:31,776 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 197.
[2020-07-20 16:54:31,777 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 197 states.
[2020-07-20 16:54:31,779 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 343 transitions.
[2020-07-20 16:54:31,780 INFO  L78                 Accepts]: Start accepts. Automaton has 197 states and 343 transitions. Word has length 160
[2020-07-20 16:54:31,780 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:54:31,781 INFO  L479      AbstractCegarLoop]: Abstraction has 197 states and 343 transitions.
[2020-07-20 16:54:31,781 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-07-20 16:54:31,781 INFO  L276                IsEmpty]: Start isEmpty. Operand 197 states and 343 transitions.
[2020-07-20 16:54:31,784 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 110
[2020-07-20 16:54:31,785 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:54:31,785 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:54:31,999 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:32,000 INFO  L427      AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:54:32,001 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:54:32,001 INFO  L82        PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 11 times
[2020-07-20 16:54:32,002 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:54:32,002 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956453554]
[2020-07-20 16:54:32,002 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:32,237 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 16:54:32,238 INFO  L229   tOrderPrioritization]: Conjunction of SSA is sat
[2020-07-20 16:54:32,238 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-20 16:54:32,272 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-07-20 16:54:32,273 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-20 16:54:32,330 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-07-20 16:54:32,331 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-07-20 16:54:32,547 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:54:32,669 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:54:32 BoogieIcfgContainer
[2020-07-20 16:54:32,670 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-20 16:54:32,673 INFO  L168              Benchmark]: Toolchain (without parser) took 51132.19 ms. Allocated memory was 143.7 MB in the beginning and 553.6 MB in the end (delta: 410.0 MB). Free memory was 102.0 MB in the beginning and 412.6 MB in the end (delta: -310.6 MB). Peak memory consumption was 99.4 MB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,674 INFO  L168              Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,675 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 443.14 ms. Allocated memory is still 143.7 MB. Free memory was 101.5 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,675 INFO  L168              Benchmark]: Boogie Preprocessor took 203.21 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 92.0 MB in the beginning and 180.2 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,676 INFO  L168              Benchmark]: RCFGBuilder took 470.25 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 166.8 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,676 INFO  L168              Benchmark]: TraceAbstraction took 50002.82 ms. Allocated memory was 201.9 MB in the beginning and 553.6 MB in the end (delta: 351.8 MB). Free memory was 166.8 MB in the beginning and 412.6 MB in the end (delta: -245.8 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB.
[2020-07-20 16:54:32,679 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.34 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 443.14 ms. Allocated memory is still 143.7 MB. Free memory was 101.5 MB in the beginning and 92.0 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 203.21 ms. Allocated memory was 143.7 MB in the beginning and 201.9 MB in the end (delta: 58.2 MB). Free memory was 92.0 MB in the beginning and 180.2 MB in the end (delta: -88.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 470.25 ms. Allocated memory is still 201.9 MB. Free memory was 180.2 MB in the beginning and 166.8 MB in the end (delta: 13.4 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 50002.82 ms. Allocated memory was 201.9 MB in the beginning and 553.6 MB in the end (delta: 351.8 MB). Free memory was 166.8 MB in the beginning and 412.6 MB in the end (delta: -245.8 MB). Peak memory consumption was 106.0 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L36]              int x = 5;
       VAL         [x=5]
[L37]  CALL, EXPR  fibo1(x)
       VAL         [\old(n)=5]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=5, n=5]
[L10]  COND FALSE  !(n == 1)
       VAL         [\old(n)=5, n=5]
[L13]  CALL, EXPR  fibo2(n-1)
       VAL         [\old(n)=4]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=4, n=4]
[L20]  COND FALSE  !(n == 1)
       VAL         [\old(n)=4, n=4]
[L23]  CALL, EXPR  fibo1(n-1)
       VAL         [\old(n)=3]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=3, n=3]
[L10]  COND FALSE  !(n == 1)
       VAL         [\old(n)=3, n=3]
[L13]  CALL, EXPR  fibo2(n-1)
       VAL         [\old(n)=2]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=2, n=2]
[L20]  COND FALSE  !(n == 1)
       VAL         [\old(n)=2, n=2]
[L23]  CALL, EXPR  fibo1(n-1)
       VAL         [\old(n)=1]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=1, n=1]
[L10]  COND TRUE   n == 1
[L11]              return 1;
       VAL         [\old(n)=1, \result=1, n=1]
[L23]  RET, EXPR   fibo1(n-1)
       VAL         [\old(n)=2, fibo1(n-1)=1, n=2]
[L23]  CALL, EXPR  fibo1(n-2)
       VAL         [\old(n)=0]
[L8]   COND TRUE   n < 1
[L9]               return 0;
       VAL         [\old(n)=0, \result=0, n=0]
[L23]  RET, EXPR   fibo1(n-2)
       VAL         [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2]
[L23]              return fibo1(n-1) + fibo1(n-2);
[L13]  RET, EXPR   fibo2(n-1)
       VAL         [\old(n)=3, fibo2(n-1)=1, n=3]
[L13]  CALL, EXPR  fibo2(n-2)
       VAL         [\old(n)=1]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=1, n=1]
[L20]  COND TRUE   n == 1
[L21]              return 1;
       VAL         [\old(n)=1, \result=1, n=1]
[L13]  RET, EXPR   fibo2(n-2)
       VAL         [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3]
[L13]              return fibo2(n-1) + fibo2(n-2);
[L23]  RET, EXPR   fibo1(n-1)
       VAL         [\old(n)=4, fibo1(n-1)=2, n=4]
[L23]  CALL, EXPR  fibo1(n-2)
       VAL         [\old(n)=2]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=2, n=2]
[L10]  COND FALSE  !(n == 1)
       VAL         [\old(n)=2, n=2]
[L13]  CALL, EXPR  fibo2(n-1)
       VAL         [\old(n)=1]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=1, n=1]
[L20]  COND TRUE   n == 1
[L21]              return 1;
       VAL         [\old(n)=1, \result=1, n=1]
[L13]  RET, EXPR   fibo2(n-1)
       VAL         [\old(n)=2, fibo2(n-1)=1, n=2]
[L13]  CALL, EXPR  fibo2(n-2)
       VAL         [\old(n)=0]
[L18]  COND TRUE   n < 1
[L19]              return 0;
       VAL         [\old(n)=0, \result=0, n=0]
[L13]  RET, EXPR   fibo2(n-2)
       VAL         [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2]
[L13]              return fibo2(n-1) + fibo2(n-2);
[L23]  RET, EXPR   fibo1(n-2)
       VAL         [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4]
[L23]              return fibo1(n-1) + fibo1(n-2);
[L13]  RET, EXPR   fibo2(n-1)
       VAL         [\old(n)=5, fibo2(n-1)=3, n=5]
[L13]  CALL, EXPR  fibo2(n-2)
       VAL         [\old(n)=3]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=3, n=3]
[L20]  COND FALSE  !(n == 1)
       VAL         [\old(n)=3, n=3]
[L23]  CALL, EXPR  fibo1(n-1)
       VAL         [\old(n)=2]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=2, n=2]
[L10]  COND FALSE  !(n == 1)
       VAL         [\old(n)=2, n=2]
[L13]  CALL, EXPR  fibo2(n-1)
       VAL         [\old(n)=1]
[L18]  COND FALSE  !(n < 1)
       VAL         [\old(n)=1, n=1]
[L20]  COND TRUE   n == 1
[L21]              return 1;
       VAL         [\old(n)=1, \result=1, n=1]
[L13]  RET, EXPR   fibo2(n-1)
       VAL         [\old(n)=2, fibo2(n-1)=1, n=2]
[L13]  CALL, EXPR  fibo2(n-2)
       VAL         [\old(n)=0]
[L18]  COND TRUE   n < 1
[L19]              return 0;
       VAL         [\old(n)=0, \result=0, n=0]
[L13]  RET, EXPR   fibo2(n-2)
       VAL         [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2]
[L13]              return fibo2(n-1) + fibo2(n-2);
[L23]  RET, EXPR   fibo1(n-1)
       VAL         [\old(n)=3, fibo1(n-1)=1, n=3]
[L23]  CALL, EXPR  fibo1(n-2)
       VAL         [\old(n)=1]
[L8]   COND FALSE  !(n < 1)
       VAL         [\old(n)=1, n=1]
[L10]  COND TRUE   n == 1
[L11]              return 1;
       VAL         [\old(n)=1, \result=1, n=1]
[L23]  RET, EXPR   fibo1(n-2)
       VAL         [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3]
[L23]              return fibo1(n-1) + fibo1(n-2);
[L13]  RET, EXPR   fibo2(n-2)
       VAL         [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5]
[L13]              return fibo2(n-1) + fibo2(n-2);
[L37]  RET, EXPR   fibo1(x)
       VAL         [fibo1(x)=5, x=5]
[L37]              int result = fibo1(x);
[L38]  COND TRUE   result == 5
       VAL         [result=5, x=5]
[L39]              __VERIFIER_error()
       VAL         [result=5, x=5]

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 49.6s, OverallIterations: 26, TraceHistogramMax: 15, AutomataDifference: 12.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 706 SDtfs, 1329 SDslu, 4900 SDs, 0 SdLazy, 5590 SolverSat, 1314 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4366 GetRequests, 3637 SyntacticMatches, 229 SemanticMatches, 500 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2187 ImplicationChecksByTransitivity, 9.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=219occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.6s AutomataMinimizationTime, 25 MinimizatonAttempts, 325 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 27.5s InterpolantComputationTime, 2202 NumberOfCodeBlocks, 1357 NumberOfCodeBlocksAsserted, 67 NumberOfCheckSat, 4111 ConstructedInterpolants, 0 QuantifiedInterpolants, 863309 SizeOfPredicates, 136 NumberOfNonLiveVariables, 3446 ConjunctsInSsa, 282 ConjunctsInUnsatCore, 48 InterpolantComputations, 2 PerfectInterpolantSequences, 7505/10454 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be incorrect!
Received shutdown request...