/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 DAGSIZE --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/loop-new/count_by_1.i


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 22:37:51,645 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 22:37:51,649 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 22:37:51,684 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 22:37:51,685 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 22:37:51,689 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 22:37:51,692 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-20 22:37:51,708 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-20 22:37:51,713 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-20 22:37:51,717 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-20 22:37:51,719 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-07-20 22:37:51,722 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-20 22:37:51,722 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 22:37:51,727 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 22:37:51,732 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 22:37:51,734 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 22:37:51,737 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 22:37:51,741 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 22:37:51,743 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 22:37:51,752 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 22:37:51,760 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 22:37:51,768 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 22:37:51,770 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 22:37:51,772 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 22:37:51,775 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 22:37:51,776 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 22:37:51,776 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 22:37:51,781 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 22:37:51,782 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 22:37:51,785 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 22:37:51,785 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-07-20 22:37:51,788 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-07-20 22:37:51,789 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-07-20 22:37:51,790 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-07-20 22:37:51,793 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-20 22:37:51,794 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-07-20 22:37:51,795 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-07-20 22:37:51,795 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-07-20 22:37:51,796 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-07-20 22:37:51,797 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-07-20 22:37:51,800 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 22:37:51,801 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 22:37:51,853 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 22:37:51,854 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 22:37:51,857 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 22:37:51,858 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 22:37:51,858 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 22:37:51,859 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 22:37:51,859 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 22:37:51,859 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 22:37:51,861 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 22:37:51,861 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 22:37:51,862 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 22:37:51,862 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 22:37:51,862 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 22:37:51,862 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 22:37:51,862 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 22:37:51,863 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 22:37:51,863 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 22:37:51,863 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 22:37:51,863 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 22:37:51,864 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 22:37:51,864 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 22:37:51,864 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 22:37:51,867 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 22:37:51,867 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 22:37:51,867 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 22:37:51,868 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 22:37:51,868 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:37:51,868 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 22:37:51,868 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 22:37:51,868 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 -> DAGSIZE
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 22:37:52,279 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 22:37:52,298 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 22:37:52,303 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 22:37:52,304 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 22:37:52,305 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 22:37:52,306 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-20 22:37:52,433 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ba702fb7/51a441a04c73423fb9020396255a2a5f/FLAGbcf1cc01c
[2020-07-20 22:37:53,240 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 22:37:53,242 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-20 22:37:53,253 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ba702fb7/51a441a04c73423fb9020396255a2a5f/FLAGbcf1cc01c
[2020-07-20 22:37:53,536 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ba702fb7/51a441a04c73423fb9020396255a2a5f
[2020-07-20 22:37:53,561 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 22:37:53,569 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 22:37:53,576 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 22:37:53,577 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 22:37:53,583 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 22:37:53,586 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:37:53" (1/1) ...
[2020-07-20 22:37:53,593 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19fe720f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:53, skipping insertion in model container
[2020-07-20 22:37:53,593 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:37:53" (1/1) ...
[2020-07-20 22:37:53,611 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 22:37:53,653 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 22:37:53,957 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 22:37:53,970 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 22:37:54,003 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 22:37:54,031 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 22:37:54,033 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54 WrapperNode
[2020-07-20 22:37:54,034 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 22:37:54,037 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 22:37:54,037 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 22:37:54,037 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 22:37:54,063 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,066 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,081 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,082 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,089 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,095 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,100 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (1/1) ...
[2020-07-20 22:37:54,103 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 22:37:54,104 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 22:37:54,104 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 22:37:54,104 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 22:37:54,106 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (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 22:37:54,349 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 22:37:54,349 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 22:37:54,349 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-07-20 22:37:54,349 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-07-20 22:37:54,350 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-20 22:37:54,352 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 22:37:54,353 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 22:37:54,353 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 22:37:54,618 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 22:37:54,619 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-07-20 22:37:54,625 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:37:54 BoogieIcfgContainer
[2020-07-20 22:37:54,626 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 22:37:54,627 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 22:37:54,628 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 22:37:54,634 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 22:37:54,635 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:37:53" (1/3) ...
[2020-07-20 22:37:54,637 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b55694c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:37:54, skipping insertion in model container
[2020-07-20 22:37:54,638 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:37:54" (2/3) ...
[2020-07-20 22:37:54,638 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b55694c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:37:54, skipping insertion in model container
[2020-07-20 22:37:54,639 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:37:54" (3/3) ...
[2020-07-20 22:37:54,642 INFO  L109   eAbstractionObserver]: Analyzing ICFG count_by_1.i
[2020-07-20 22:37:54,662 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 22:37:54,677 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 22:37:54,701 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 22:37:54,745 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 22:37:54,745 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 22:37:54,745 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 22:37:54,745 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 22:37:54,746 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 22:37:54,746 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 22:37:54,746 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 22:37:54,746 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 22:37:54,770 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states.
[2020-07-20 22:37:54,780 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2020-07-20 22:37:54,781 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:37:54,783 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:37:54,785 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:37:54,796 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:37:54,797 INFO  L82        PathProgramCache]: Analyzing trace with hash 650151859, now seen corresponding path program 1 times
[2020-07-20 22:37:54,812 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:37:54,813 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117806833]
[2020-07-20 22:37:54,813 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 22:37:54,918 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 22:37:54,919 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:37:54,923 INFO  L263         TraceCheckSpWp]: Trace formula consists of 9 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 22:37:54,931 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:37:55,028 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 22:37:55,029 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:37:55,030 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117806833]
[2020-07-20 22:37:55,033 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:37:55,034 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:37:55,037 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704379527]
[2020-07-20 22:37:55,051 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:37:55,052 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:37:55,112 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:37:55,114 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:37:55,125 INFO  L87              Difference]: Start difference. First operand 19 states. Second operand 3 states.
[2020-07-20 22:37:55,226 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:37:55,227 INFO  L93              Difference]: Finished difference Result 33 states and 38 transitions.
[2020-07-20 22:37:55,228 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:37:55,230 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 10
[2020-07-20 22:37:55,231 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:37:55,242 INFO  L225             Difference]: With dead ends: 33
[2020-07-20 22:37:55,243 INFO  L226             Difference]: Without dead ends: 14
[2020-07-20 22:37:55,249 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:37:55,272 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2020-07-20 22:37:55,302 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13.
[2020-07-20 22:37:55,304 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 13 states.
[2020-07-20 22:37:55,306 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions.
[2020-07-20 22:37:55,309 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10
[2020-07-20 22:37:55,310 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:37:55,311 INFO  L479      AbstractCegarLoop]: Abstraction has 13 states and 13 transitions.
[2020-07-20 22:37:55,311 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 22:37:55,311 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions.
[2020-07-20 22:37:55,312 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-07-20 22:37:55,312 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:37:55,312 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:37:55,526 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:37:55,527 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:37:55,528 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:37:55,528 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133927695, now seen corresponding path program 1 times
[2020-07-20 22:37:55,529 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:37:55,529 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795013179]
[2020-07-20 22:37:55,530 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 22:37:55,570 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:37:55,571 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:37:55,573 INFO  L263         TraceCheckSpWp]: Trace formula consists of 14 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 22:37:55,574 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:37:55,621 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:55,622 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:37:55,687 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:55,688 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795013179]
[2020-07-20 22:37:55,689 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:37:55,689 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6
[2020-07-20 22:37:55,690 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627970092]
[2020-07-20 22:37:55,693 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-07-20 22:37:55,694 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:37:55,695 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-07-20 22:37:55,696 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-20 22:37:55,696 INFO  L87              Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states.
[2020-07-20 22:37:55,777 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:37:55,778 INFO  L93              Difference]: Finished difference Result 24 states and 26 transitions.
[2020-07-20 22:37:55,778 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-07-20 22:37:55,778 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 12
[2020-07-20 22:37:55,779 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:37:55,780 INFO  L225             Difference]: With dead ends: 24
[2020-07-20 22:37:55,780 INFO  L226             Difference]: Without dead ends: 19
[2020-07-20 22:37:55,782 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-20 22:37:55,783 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-07-20 22:37:55,788 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-07-20 22:37:55,789 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-07-20 22:37:55,790 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions.
[2020-07-20 22:37:55,791 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12
[2020-07-20 22:37:55,792 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:37:55,792 INFO  L479      AbstractCegarLoop]: Abstraction has 19 states and 19 transitions.
[2020-07-20 22:37:55,792 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-07-20 22:37:55,793 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions.
[2020-07-20 22:37:55,793 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-07-20 22:37:55,794 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:37:55,794 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:37:56,008 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:37:56,009 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:37:56,010 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:37:56,011 INFO  L82        PathProgramCache]: Analyzing trace with hash -1338939477, now seen corresponding path program 2 times
[2020-07-20 22:37:56,012 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:37:56,013 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996671199]
[2020-07-20 22:37:56,013 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 22:37:56,045 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:37:56,046 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:37:56,048 INFO  L263         TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 22:37:56,051 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:37:56,149 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:56,150 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:37:56,302 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:56,303 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996671199]
[2020-07-20 22:37:56,304 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:37:56,304 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12
[2020-07-20 22:37:56,305 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786324144]
[2020-07-20 22:37:56,306 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 22:37:56,307 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:37:56,307 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 22:37:56,308 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-20 22:37:56,309 INFO  L87              Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 12 states.
[2020-07-20 22:37:56,436 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:37:56,437 INFO  L93              Difference]: Finished difference Result 36 states and 41 transitions.
[2020-07-20 22:37:56,438 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-07-20 22:37:56,439 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 18
[2020-07-20 22:37:56,440 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:37:56,441 INFO  L225             Difference]: With dead ends: 36
[2020-07-20 22:37:56,442 INFO  L226             Difference]: Without dead ends: 31
[2020-07-20 22:37:56,443 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-20 22:37:56,444 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-07-20 22:37:56,452 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31.
[2020-07-20 22:37:56,453 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-07-20 22:37:56,455 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions.
[2020-07-20 22:37:56,456 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 18
[2020-07-20 22:37:56,457 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:37:56,458 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 31 transitions.
[2020-07-20 22:37:56,458 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 22:37:56,458 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions.
[2020-07-20 22:37:56,460 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-07-20 22:37:56,460 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:37:56,460 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:37:56,675 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:37:56,677 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:37:56,678 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:37:56,678 INFO  L82        PathProgramCache]: Analyzing trace with hash 1154594463, now seen corresponding path program 3 times
[2020-07-20 22:37:56,681 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:37:56,681 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2034099707]
[2020-07-20 22:37:56,682 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 22:37:56,738 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:37:56,739 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:37:56,741 INFO  L263         TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 22:37:56,745 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:37:57,002 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:57,003 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:37:57,461 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:57,462 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2034099707]
[2020-07-20 22:37:57,462 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:37:57,462 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24
[2020-07-20 22:37:57,463 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018812697]
[2020-07-20 22:37:57,464 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 24 states
[2020-07-20 22:37:57,464 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:37:57,464 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2020-07-20 22:37:57,465 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-20 22:37:57,465 INFO  L87              Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 24 states.
[2020-07-20 22:37:57,691 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:37:57,691 INFO  L93              Difference]: Finished difference Result 60 states and 71 transitions.
[2020-07-20 22:37:57,692 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-07-20 22:37:57,693 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 30
[2020-07-20 22:37:57,694 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:37:57,696 INFO  L225             Difference]: With dead ends: 60
[2020-07-20 22:37:57,696 INFO  L226             Difference]: Without dead ends: 55
[2020-07-20 22:37:57,698 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-20 22:37:57,699 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-07-20 22:37:57,709 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55.
[2020-07-20 22:37:57,710 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55 states.
[2020-07-20 22:37:57,712 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions.
[2020-07-20 22:37:57,713 INFO  L78                 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 30
[2020-07-20 22:37:57,713 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:37:57,713 INFO  L479      AbstractCegarLoop]: Abstraction has 55 states and 55 transitions.
[2020-07-20 22:37:57,713 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2020-07-20 22:37:57,714 INFO  L276                IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions.
[2020-07-20 22:37:57,715 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 55
[2020-07-20 22:37:57,716 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:37:57,716 INFO  L422         BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:37:57,931 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:37:57,932 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:37:57,934 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:37:57,935 INFO  L82        PathProgramCache]: Analyzing trace with hash -1804670329, now seen corresponding path program 4 times
[2020-07-20 22:37:57,935 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:37:57,936 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796487609]
[2020-07-20 22:37:57,936 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 22:37:57,999 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:37:58,000 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:37:58,002 INFO  L263         TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 24 conjunts are in the unsatisfiable core
[2020-07-20 22:37:58,007 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:37:58,626 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:58,627 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:37:59,859 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:37:59,860 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796487609]
[2020-07-20 22:37:59,860 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:37:59,860 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48
[2020-07-20 22:37:59,861 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433320796]
[2020-07-20 22:37:59,862 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 48 states
[2020-07-20 22:37:59,863 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:37:59,863 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants.
[2020-07-20 22:37:59,865 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-20 22:37:59,866 INFO  L87              Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 48 states.
[2020-07-20 22:38:00,263 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:38:00,265 INFO  L93              Difference]: Finished difference Result 108 states and 131 transitions.
[2020-07-20 22:38:00,267 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. 
[2020-07-20 22:38:00,267 INFO  L78                 Accepts]: Start accepts. Automaton has 48 states. Word has length 54
[2020-07-20 22:38:00,268 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:38:00,272 INFO  L225             Difference]: With dead ends: 108
[2020-07-20 22:38:00,273 INFO  L226             Difference]: Without dead ends: 103
[2020-07-20 22:38:00,276 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-20 22:38:00,278 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 103 states.
[2020-07-20 22:38:00,309 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103.
[2020-07-20 22:38:00,310 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 103 states.
[2020-07-20 22:38:00,325 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions.
[2020-07-20 22:38:00,330 INFO  L78                 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 54
[2020-07-20 22:38:00,330 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:38:00,331 INFO  L479      AbstractCegarLoop]: Abstraction has 103 states and 103 transitions.
[2020-07-20 22:38:00,331 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 48 states.
[2020-07-20 22:38:00,331 INFO  L276                IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions.
[2020-07-20 22:38:00,342 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 103
[2020-07-20 22:38:00,343 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:38:00,344 INFO  L422         BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:38:00,544 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:38:00,546 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:38:00,546 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:38:00,546 INFO  L82        PathProgramCache]: Analyzing trace with hash 1210559063, now seen corresponding path program 5 times
[2020-07-20 22:38:00,547 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:38:00,547 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505830518]
[2020-07-20 22:38:00,548 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 22:38:00,602 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:38:00,602 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:38:00,605 INFO  L263         TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 48 conjunts are in the unsatisfiable core
[2020-07-20 22:38:00,611 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:38:02,191 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:38:02,191 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:38:06,937 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:38:06,938 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505830518]
[2020-07-20 22:38:06,938 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:38:06,938 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96
[2020-07-20 22:38:06,939 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194884901]
[2020-07-20 22:38:06,940 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 96 states
[2020-07-20 22:38:06,940 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:38:06,941 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants.
[2020-07-20 22:38:06,945 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-20 22:38:06,945 INFO  L87              Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 96 states.
[2020-07-20 22:38:07,387 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:38:07,388 INFO  L93              Difference]: Finished difference Result 204 states and 251 transitions.
[2020-07-20 22:38:07,397 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. 
[2020-07-20 22:38:07,398 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states. Word has length 102
[2020-07-20 22:38:07,398 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:38:07,402 INFO  L225             Difference]: With dead ends: 204
[2020-07-20 22:38:07,402 INFO  L226             Difference]: Without dead ends: 199
[2020-07-20 22:38:07,406 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-20 22:38:07,407 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 199 states.
[2020-07-20 22:38:07,422 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199.
[2020-07-20 22:38:07,423 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 199 states.
[2020-07-20 22:38:07,425 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions.
[2020-07-20 22:38:07,425 INFO  L78                 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 102
[2020-07-20 22:38:07,426 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:38:07,426 INFO  L479      AbstractCegarLoop]: Abstraction has 199 states and 199 transitions.
[2020-07-20 22:38:07,426 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 96 states.
[2020-07-20 22:38:07,426 INFO  L276                IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions.
[2020-07-20 22:38:07,429 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 199
[2020-07-20 22:38:07,429 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:38:07,429 INFO  L422         BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:38:07,643 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:38:07,644 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:38:07,645 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:38:07,645 INFO  L82        PathProgramCache]: Analyzing trace with hash 2113047031, now seen corresponding path program 6 times
[2020-07-20 22:38:07,646 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:38:07,647 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935397266]
[2020-07-20 22:38:07,647 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 22:38:07,753 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:38:07,754 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:38:07,759 INFO  L263         TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 96 conjunts are in the unsatisfiable core
[2020-07-20 22:38:07,770 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:38:13,589 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:38:13,590 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:38:30,457 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:38:30,458 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935397266]
[2020-07-20 22:38:30,458 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:38:30,458 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192
[2020-07-20 22:38:30,459 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463007931]
[2020-07-20 22:38:30,460 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 192 states
[2020-07-20 22:38:30,461 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:38:30,465 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants.
[2020-07-20 22:38:30,474 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-20 22:38:30,475 INFO  L87              Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 192 states.
[2020-07-20 22:38:32,655 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:38:32,655 INFO  L93              Difference]: Finished difference Result 396 states and 491 transitions.
[2020-07-20 22:38:32,656 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. 
[2020-07-20 22:38:32,657 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states. Word has length 198
[2020-07-20 22:38:32,658 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:38:32,662 INFO  L225             Difference]: With dead ends: 396
[2020-07-20 22:38:32,663 INFO  L226             Difference]: Without dead ends: 391
[2020-07-20 22:38:32,669 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-20 22:38:32,671 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 391 states.
[2020-07-20 22:38:32,702 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 391.
[2020-07-20 22:38:32,702 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 391 states.
[2020-07-20 22:38:32,707 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 391 transitions.
[2020-07-20 22:38:32,708 INFO  L78                 Accepts]: Start accepts. Automaton has 391 states and 391 transitions. Word has length 198
[2020-07-20 22:38:32,709 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:38:32,709 INFO  L479      AbstractCegarLoop]: Abstraction has 391 states and 391 transitions.
[2020-07-20 22:38:32,709 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 192 states.
[2020-07-20 22:38:32,710 INFO  L276                IsEmpty]: Start isEmpty. Operand 391 states and 391 transitions.
[2020-07-20 22:38:32,717 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 391
[2020-07-20 22:38:32,717 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:38:32,718 INFO  L422         BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:38:32,932 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:38:32,933 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:38:32,934 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:38:32,935 INFO  L82        PathProgramCache]: Analyzing trace with hash 1173211447, now seen corresponding path program 7 times
[2020-07-20 22:38:32,935 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:38:32,936 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [219063720]
[2020-07-20 22:38:32,936 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 22:38:33,075 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:38:33,076 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:38:33,088 INFO  L263         TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 192 conjunts are in the unsatisfiable core
[2020-07-20 22:38:33,121 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:38:57,289 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:38:57,290 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 22:40:23,911 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:40:23,912 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [219063720]
[2020-07-20 22:40:23,912 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 22:40:23,913 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384
[2020-07-20 22:40:23,913 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526745076]
[2020-07-20 22:40:23,915 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 384 states
[2020-07-20 22:40:23,915 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:40:23,932 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants.
[2020-07-20 22:40:23,946 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-20 22:40:23,947 INFO  L87              Difference]: Start difference. First operand 391 states and 391 transitions. Second operand 384 states.
[2020-07-20 22:40:32,894 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:40:32,895 INFO  L93              Difference]: Finished difference Result 780 states and 971 transitions.
[2020-07-20 22:40:32,897 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. 
[2020-07-20 22:40:32,899 INFO  L78                 Accepts]: Start accepts. Automaton has 384 states. Word has length 390
[2020-07-20 22:40:32,901 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:40:32,911 INFO  L225             Difference]: With dead ends: 780
[2020-07-20 22:40:32,912 INFO  L226             Difference]: Without dead ends: 775
[2020-07-20 22:40:32,924 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 779 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 110.0s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-20 22:40:32,927 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 775 states.
[2020-07-20 22:40:33,002 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 775.
[2020-07-20 22:40:33,003 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 775 states.
[2020-07-20 22:40:33,011 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 775 transitions.
[2020-07-20 22:40:33,012 INFO  L78                 Accepts]: Start accepts. Automaton has 775 states and 775 transitions. Word has length 390
[2020-07-20 22:40:33,013 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:40:33,014 INFO  L479      AbstractCegarLoop]: Abstraction has 775 states and 775 transitions.
[2020-07-20 22:40:33,014 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 384 states.
[2020-07-20 22:40:33,014 INFO  L276                IsEmpty]: Start isEmpty. Operand 775 states and 775 transitions.
[2020-07-20 22:40:33,045 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 775
[2020-07-20 22:40:33,045 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:40:33,046 INFO  L422         BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:40:33,261 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:40:33,262 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:40:33,263 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:40:33,264 INFO  L82        PathProgramCache]: Analyzing trace with hash 1601849271, now seen corresponding path program 8 times
[2020-07-20 22:40:33,264 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:40:33,264 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991390397]
[2020-07-20 22:40:33,265 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 22:40:33,576 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:40:33,577 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:40:33,604 INFO  L263         TraceCheckSpWp]: Trace formula consists of 776 conjuncts, 384 conjunts are in the unsatisfiable core
[2020-07-20 22:40:33,633 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:43:08,681 INFO  L134       CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 22:43:08,682 INFO  L328         TraceCheckSpWp]: Computing backward predicates...