/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/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 22:59:40,397 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 22:59:40,399 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 22:59:40,419 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 22:59:40,419 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 22:59:40,421 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 22:59:40,423 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-20 22:59:40,437 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-20 22:59:40,438 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-20 22:59:40,439 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-20 22:59:40,442 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-07-20 22:59:40,443 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-20 22:59:40,443 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 22:59:40,447 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 22:59:40,449 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 22:59:40,451 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 22:59:40,454 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 22:59:40,455 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 22:59:40,457 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 22:59:40,463 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 22:59:40,468 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 22:59:40,469 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 22:59:40,471 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 22:59:40,471 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 22:59:40,474 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 22:59:40,474 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 22:59:40,475 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 22:59:40,477 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 22:59:40,478 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 22:59:40,480 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 22:59:40,480 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-07-20 22:59:40,482 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-07-20 22:59:40,483 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-07-20 22:59:40,483 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-07-20 22:59:40,488 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-20 22:59:40,488 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-07-20 22:59:40,489 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-07-20 22:59:40,489 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-07-20 22:59:40,489 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-07-20 22:59:40,490 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-07-20 22:59:40,491 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 22:59:40,492 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 22:59:40,514 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 22:59:40,515 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 22:59:40,517 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 22:59:40,517 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 22:59:40,517 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 22:59:40,517 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 22:59:40,517 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 22:59:40,518 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 22:59:40,518 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 22:59:40,518 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 22:59:40,519 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 22:59:40,519 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 22:59:40,520 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 22:59:40,520 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 22:59:40,520 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 22:59:40,520 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 22:59:40,521 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 22:59:40,521 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 22:59:40,521 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 22:59:40,521 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 22:59:40,521 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 22:59:40,522 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 22:59:40,522 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 22:59:40,522 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 22:59:40,522 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 22:59:40,522 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 22:59:40,523 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:40,523 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 22:59:40,523 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 22:59:40,523 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 22:59:40,794 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 22:59:40,807 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 22:59:40,810 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 22:59:40,812 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 22:59:40,812 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 22:59:40,813 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-07-20 22:59:40,885 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04734b061/6a926e636f8041a8be6750d5d87ab1c4/FLAGb3c4a2667
[2020-07-20 22:59:41,607 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 22:59:41,608 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-07-20 22:59:41,639 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04734b061/6a926e636f8041a8be6750d5d87ab1c4/FLAGb3c4a2667
[2020-07-20 22:59:41,739 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04734b061/6a926e636f8041a8be6750d5d87ab1c4
[2020-07-20 22:59:41,748 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 22:59:41,751 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 22:59:41,752 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 22:59:41,752 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 22:59:41,756 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 22:59:41,757 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:59:41" (1/1) ...
[2020-07-20 22:59:41,760 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21bc1a9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:41, skipping insertion in model container
[2020-07-20 22:59:41,760 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:59:41" (1/1) ...
[2020-07-20 22:59:41,768 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 22:59:41,944 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 22:59:43,492 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 22:59:43,518 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 22:59:44,490 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 22:59:44,524 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 22:59:44,525 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44 WrapperNode
[2020-07-20 22:59:44,526 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 22:59:44,526 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 22:59:44,527 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 22:59:44,527 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 22:59:44,541 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,543 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,589 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,589 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,654 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,688 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,707 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (1/1) ...
[2020-07-20 22:59:44,742 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 22:59:44,743 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 22:59:44,743 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 22:59:44,743 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 22:59:44,748 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (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 22:59:44,836 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 22:59:44,837 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 22:59:44,837 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-07-20 22:59:44,837 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 22:59:44,838 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 22:59:44,838 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-07-20 22:59:44,839 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-07-20 22:59:44,839 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-07-20 22:59:44,839 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-07-20 22:59:44,839 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-07-20 22:59:44,840 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-07-20 22:59:44,840 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-07-20 22:59:44,840 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-07-20 22:59:44,841 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-07-20 22:59:44,841 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-07-20 22:59:44,842 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-07-20 22:59:44,842 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-07-20 22:59:44,842 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-07-20 22:59:44,842 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-07-20 22:59:44,843 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 22:59:44,843 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 22:59:44,843 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 22:59:48,700 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 22:59:48,700 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 22:59:48,711 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:59:48 BoogieIcfgContainer
[2020-07-20 22:59:48,712 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 22:59:48,713 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 22:59:48,713 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 22:59:48,716 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 22:59:48,717 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:59:41" (1/3) ...
[2020-07-20 22:59:48,718 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72c2e7c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:59:48, skipping insertion in model container
[2020-07-20 22:59:48,718 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:59:44" (2/3) ...
[2020-07-20 22:59:48,718 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72c2e7c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:59:48, skipping insertion in model container
[2020-07-20 22:59:48,719 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:59:48" (3/3) ...
[2020-07-20 22:59:48,720 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-07-20 22:59:48,731 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 22:59:48,740 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 22:59:48,755 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 22:59:48,783 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 22:59:48,783 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 22:59:48,783 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 22:59:48,783 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 22:59:48,784 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 22:59:48,784 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 22:59:48,784 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 22:59:48,784 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 22:59:48,826 INFO  L276                IsEmpty]: Start isEmpty. Operand 1322 states.
[2020-07-20 22:59:48,865 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-07-20 22:59:48,865 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:48,867 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:48,867 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:48,873 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:48,874 INFO  L82        PathProgramCache]: Analyzing trace with hash -191467784, now seen corresponding path program 1 times
[2020-07-20 22:59:48,883 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:48,883 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492691985]
[2020-07-20 22:59:48,884 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 22:59:49,447 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 22:59:49,448 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:49,455 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1418 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 22:59:49,479 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:49,870 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 22:59:49,870 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:49,871 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492691985]
[2020-07-20 22:59:49,872 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:49,872 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:59:49,873 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543291233]
[2020-07-20 22:59:49,882 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:59:49,882 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:49,896 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:59:49,897 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:59:49,899 INFO  L87              Difference]: Start difference. First operand 1322 states. Second operand 3 states.
[2020-07-20 22:59:50,278 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:50,278 INFO  L93              Difference]: Finished difference Result 1763 states and 3140 transitions.
[2020-07-20 22:59:50,279 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:59:50,280 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 467
[2020-07-20 22:59:50,283 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:50,313 INFO  L225             Difference]: With dead ends: 1763
[2020-07-20 22:59:50,313 INFO  L226             Difference]: Without dead ends: 1559
[2020-07-20 22:59:50,319 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 465 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 22:59:50,342 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1559 states.
[2020-07-20 22:59:50,452 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1559 to 1557.
[2020-07-20 22:59:50,453 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1557 states.
[2020-07-20 22:59:50,461 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1557 states to 1557 states and 2577 transitions.
[2020-07-20 22:59:50,463 INFO  L78                 Accepts]: Start accepts. Automaton has 1557 states and 2577 transitions. Word has length 467
[2020-07-20 22:59:50,465 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:59:50,465 INFO  L479      AbstractCegarLoop]: Abstraction has 1557 states and 2577 transitions.
[2020-07-20 22:59:50,465 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 22:59:50,465 INFO  L276                IsEmpty]: Start isEmpty. Operand 1557 states and 2577 transitions.
[2020-07-20 22:59:50,477 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-07-20 22:59:50,477 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:50,478 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:50,693 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:50,694 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:50,694 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:50,695 INFO  L82        PathProgramCache]: Analyzing trace with hash -1227921449, now seen corresponding path program 1 times
[2020-07-20 22:59:50,695 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:50,696 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859214218]
[2020-07-20 22:59:50,696 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 22:59:51,174 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:59:51,175 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:51,183 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1635 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 22:59:51,193 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:51,543 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 22:59:51,544 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:51,544 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859214218]
[2020-07-20 22:59:51,544 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:51,544 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 22:59:51,544 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7556871]
[2020-07-20 22:59:51,547 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 22:59:51,547 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:51,547 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 22:59:51,548 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 22:59:51,548 INFO  L87              Difference]: Start difference. First operand 1557 states and 2577 transitions. Second operand 4 states.
[2020-07-20 22:59:51,868 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:51,868 INFO  L93              Difference]: Finished difference Result 4612 states and 7636 transitions.
[2020-07-20 22:59:51,869 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 22:59:51,869 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 467
[2020-07-20 22:59:51,870 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:51,886 INFO  L225             Difference]: With dead ends: 4612
[2020-07-20 22:59:51,887 INFO  L226             Difference]: Without dead ends: 3072
[2020-07-20 22:59:51,893 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 464 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 22:59:51,898 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3072 states.
[2020-07-20 22:59:52,022 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3072 to 3070.
[2020-07-20 22:59:52,022 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3070 states.
[2020-07-20 22:59:52,036 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3070 states to 3070 states and 5062 transitions.
[2020-07-20 22:59:52,036 INFO  L78                 Accepts]: Start accepts. Automaton has 3070 states and 5062 transitions. Word has length 467
[2020-07-20 22:59:52,037 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:59:52,037 INFO  L479      AbstractCegarLoop]: Abstraction has 3070 states and 5062 transitions.
[2020-07-20 22:59:52,037 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 22:59:52,037 INFO  L276                IsEmpty]: Start isEmpty. Operand 3070 states and 5062 transitions.
[2020-07-20 22:59:52,046 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 470
[2020-07-20 22:59:52,046 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:52,047 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:52,258 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:52,258 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:52,259 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:52,259 INFO  L82        PathProgramCache]: Analyzing trace with hash 1934187579, now seen corresponding path program 1 times
[2020-07-20 22:59:52,260 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:52,260 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539807836]
[2020-07-20 22:59:52,261 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 22:59:52,720 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:59:52,721 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:52,728 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 22:59:52,736 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:52,964 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 22:59:52,964 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:52,965 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539807836]
[2020-07-20 22:59:52,965 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:52,965 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:59:52,966 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051389504]
[2020-07-20 22:59:52,967 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:59:52,967 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:52,967 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:59:52,967 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:59:52,968 INFO  L87              Difference]: Start difference. First operand 3070 states and 5062 transitions. Second operand 3 states.
[2020-07-20 22:59:53,358 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:53,358 INFO  L93              Difference]: Finished difference Result 8928 states and 14687 transitions.
[2020-07-20 22:59:53,359 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:59:53,359 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 469
[2020-07-20 22:59:53,360 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:53,392 INFO  L225             Difference]: With dead ends: 8928
[2020-07-20 22:59:53,393 INFO  L226             Difference]: Without dead ends: 6072
[2020-07-20 22:59:53,401 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 467 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 22:59:53,411 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 6072 states.
[2020-07-20 22:59:53,690 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 6072 to 6070.
[2020-07-20 22:59:53,691 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 6070 states.
[2020-07-20 22:59:53,777 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 6070 states to 6070 states and 9977 transitions.
[2020-07-20 22:59:53,777 INFO  L78                 Accepts]: Start accepts. Automaton has 6070 states and 9977 transitions. Word has length 469
[2020-07-20 22:59:53,778 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:59:53,778 INFO  L479      AbstractCegarLoop]: Abstraction has 6070 states and 9977 transitions.
[2020-07-20 22:59:53,778 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 22:59:53,778 INFO  L276                IsEmpty]: Start isEmpty. Operand 6070 states and 9977 transitions.
[2020-07-20 22:59:53,793 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 471
[2020-07-20 22:59:53,793 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:53,793 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:54,006 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:54,007 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:54,007 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:54,008 INFO  L82        PathProgramCache]: Analyzing trace with hash -269242540, now seen corresponding path program 1 times
[2020-07-20 22:59:54,008 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:54,008 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652348709]
[2020-07-20 22:59:54,009 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 22:59:54,463 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:59:54,463 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:54,470 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1638 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 22:59:54,478 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:54,589 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 22:59:54,589 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:54,590 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652348709]
[2020-07-20 22:59:54,590 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:54,590 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:59:54,590 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243889114]
[2020-07-20 22:59:54,591 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:59:54,591 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:54,591 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:59:54,592 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:59:54,592 INFO  L87              Difference]: Start difference. First operand 6070 states and 9977 transitions. Second operand 3 states.
[2020-07-20 22:59:55,039 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:55,039 INFO  L93              Difference]: Finished difference Result 18113 states and 29763 transitions.
[2020-07-20 22:59:55,040 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:59:55,040 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 470
[2020-07-20 22:59:55,040 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:55,119 INFO  L225             Difference]: With dead ends: 18113
[2020-07-20 22:59:55,120 INFO  L226             Difference]: Without dead ends: 12095
[2020-07-20 22:59:55,153 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 468 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 22:59:55,172 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 12095 states.
[2020-07-20 22:59:55,566 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 12095 to 6117.
[2020-07-20 22:59:55,567 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 6117 states.
[2020-07-20 22:59:55,582 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 6117 states to 6117 states and 10051 transitions.
[2020-07-20 22:59:55,583 INFO  L78                 Accepts]: Start accepts. Automaton has 6117 states and 10051 transitions. Word has length 470
[2020-07-20 22:59:55,583 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:59:55,583 INFO  L479      AbstractCegarLoop]: Abstraction has 6117 states and 10051 transitions.
[2020-07-20 22:59:55,583 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 22:59:55,583 INFO  L276                IsEmpty]: Start isEmpty. Operand 6117 states and 10051 transitions.
[2020-07-20 22:59:55,597 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 472
[2020-07-20 22:59:55,597 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:55,598 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:55,811 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:55,812 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:55,812 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:55,813 INFO  L82        PathProgramCache]: Analyzing trace with hash -335154176, now seen corresponding path program 1 times
[2020-07-20 22:59:55,813 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:55,813 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50355306]
[2020-07-20 22:59:55,814 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 22:59:56,279 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 22:59:56,279 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:56,287 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 22:59:56,302 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:56,565 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 22:59:56,565 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:56,565 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50355306]
[2020-07-20 22:59:56,565 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:56,566 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:59:56,566 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105652295]
[2020-07-20 22:59:56,567 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:59:56,567 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:56,567 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:59:56,567 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:59:56,568 INFO  L87              Difference]: Start difference. First operand 6117 states and 10051 transitions. Second operand 3 states.
[2020-07-20 22:59:57,057 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:57,057 INFO  L93              Difference]: Finished difference Result 17668 states and 28944 transitions.
[2020-07-20 22:59:57,057 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:59:57,058 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 471
[2020-07-20 22:59:57,058 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:57,090 INFO  L225             Difference]: With dead ends: 17668
[2020-07-20 22:59:57,090 INFO  L226             Difference]: Without dead ends: 11950
[2020-07-20 22:59:57,104 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 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 22:59:57,119 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 11950 states.
[2020-07-20 22:59:57,566 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 11950 to 11948.
[2020-07-20 22:59:57,566 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 11948 states.
[2020-07-20 22:59:57,592 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 11948 states to 11948 states and 19537 transitions.
[2020-07-20 22:59:57,593 INFO  L78                 Accepts]: Start accepts. Automaton has 11948 states and 19537 transitions. Word has length 471
[2020-07-20 22:59:57,593 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 22:59:57,594 INFO  L479      AbstractCegarLoop]: Abstraction has 11948 states and 19537 transitions.
[2020-07-20 22:59:57,594 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 22:59:57,594 INFO  L276                IsEmpty]: Start isEmpty. Operand 11948 states and 19537 transitions.
[2020-07-20 22:59:57,619 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 472
[2020-07-20 22:59:57,619 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 22:59:57,619 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 22:59:57,832 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 22:59:57,833 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 22:59:57,833 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 22:59:57,833 INFO  L82        PathProgramCache]: Analyzing trace with hash -1765810725, now seen corresponding path program 1 times
[2020-07-20 22:59:57,834 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 22:59:57,834 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132656841]
[2020-07-20 22:59:57,834 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 22:59:58,752 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 22:59:58,753 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 22:59:58,758 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1421 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 22:59:58,768 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 22:59:58,900 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 22:59:58,908 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 22:59:58,909 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132656841]
[2020-07-20 22:59:58,909 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 22:59:58,909 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 22:59:58,909 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102556465]
[2020-07-20 22:59:58,910 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 22:59:58,911 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 22:59:58,911 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 22:59:58,912 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 22:59:58,912 INFO  L87              Difference]: Start difference. First operand 11948 states and 19537 transitions. Second operand 3 states.
[2020-07-20 22:59:59,500 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 22:59:59,501 INFO  L93              Difference]: Finished difference Result 35574 states and 58135 transitions.
[2020-07-20 22:59:59,501 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 22:59:59,501 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 471
[2020-07-20 22:59:59,502 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 22:59:59,561 INFO  L225             Difference]: With dead ends: 35574
[2020-07-20 22:59:59,561 INFO  L226             Difference]: Without dead ends: 23765
[2020-07-20 22:59:59,602 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 469 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 22:59:59,633 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23765 states.
[2020-07-20 23:00:00,230 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23765 to 12027.
[2020-07-20 23:00:00,230 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 12027 states.
[2020-07-20 23:00:00,251 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 12027 states to 12027 states and 19642 transitions.
[2020-07-20 23:00:00,251 INFO  L78                 Accepts]: Start accepts. Automaton has 12027 states and 19642 transitions. Word has length 471
[2020-07-20 23:00:00,251 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:00,252 INFO  L479      AbstractCegarLoop]: Abstraction has 12027 states and 19642 transitions.
[2020-07-20 23:00:00,252 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:00,252 INFO  L276                IsEmpty]: Start isEmpty. Operand 12027 states and 19642 transitions.
[2020-07-20 23:00:00,278 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 473
[2020-07-20 23:00:00,279 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:00,280 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:00,492 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:00,493 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:00,493 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:00,493 INFO  L82        PathProgramCache]: Analyzing trace with hash -893572627, now seen corresponding path program 1 times
[2020-07-20 23:00:00,494 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:00,494 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221517798]
[2020-07-20 23:00:00,494 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 23:00:00,906 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:00,906 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:00,911 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1637 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:00,919 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:01,029 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 23:00:01,029 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:01,029 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221517798]
[2020-07-20 23:00:01,029 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:01,029 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:01,030 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073129549]
[2020-07-20 23:00:01,030 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:01,031 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:01,031 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:01,031 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:01,031 INFO  L87              Difference]: Start difference. First operand 12027 states and 19642 transitions. Second operand 3 states.
[2020-07-20 23:00:01,658 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:01,658 INFO  L93              Difference]: Finished difference Result 35734 states and 58356 transitions.
[2020-07-20 23:00:01,658 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:01,659 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 472
[2020-07-20 23:00:01,659 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:01,717 INFO  L225             Difference]: With dead ends: 35734
[2020-07-20 23:00:01,717 INFO  L226             Difference]: Without dead ends: 23901
[2020-07-20 23:00:01,748 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 470 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 23:00:01,773 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23901 states.
[2020-07-20 23:00:02,246 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23901 to 12163.
[2020-07-20 23:00:02,246 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 12163 states.
[2020-07-20 23:00:02,274 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 12163 states to 12163 states and 19834 transitions.
[2020-07-20 23:00:02,274 INFO  L78                 Accepts]: Start accepts. Automaton has 12163 states and 19834 transitions. Word has length 472
[2020-07-20 23:00:02,275 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:02,275 INFO  L479      AbstractCegarLoop]: Abstraction has 12163 states and 19834 transitions.
[2020-07-20 23:00:02,275 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:02,275 INFO  L276                IsEmpty]: Start isEmpty. Operand 12163 states and 19834 transitions.
[2020-07-20 23:00:02,294 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-07-20 23:00:02,295 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:02,295 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:02,508 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:02,509 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:02,510 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:02,510 INFO  L82        PathProgramCache]: Analyzing trace with hash 1974730661, now seen corresponding path program 1 times
[2020-07-20 23:00:02,510 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:02,510 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [793264689]
[2020-07-20 23:00:02,511 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 23:00:02,972 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:02,972 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:02,980 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 23:00:02,990 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:03,252 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 23:00:03,252 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:03,253 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [793264689]
[2020-07-20 23:00:03,253 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:03,253 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 23:00:03,253 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874884701]
[2020-07-20 23:00:03,254 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 23:00:03,254 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:03,255 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 23:00:03,255 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 23:00:03,255 INFO  L87              Difference]: Start difference. First operand 12163 states and 19834 transitions. Second operand 4 states.
[2020-07-20 23:00:04,119 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:04,120 INFO  L93              Difference]: Finished difference Result 28063 states and 46055 transitions.
[2020-07-20 23:00:04,120 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 23:00:04,120 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 473
[2020-07-20 23:00:04,121 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:04,144 INFO  L225             Difference]: With dead ends: 28063
[2020-07-20 23:00:04,144 INFO  L226             Difference]: Without dead ends: 14495
[2020-07-20 23:00:04,184 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 470 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 23:00:04,198 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14495 states.
[2020-07-20 23:00:04,889 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14495 to 14493.
[2020-07-20 23:00:04,889 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 14493 states.
[2020-07-20 23:00:04,913 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14493 states to 14493 states and 23706 transitions.
[2020-07-20 23:00:04,913 INFO  L78                 Accepts]: Start accepts. Automaton has 14493 states and 23706 transitions. Word has length 473
[2020-07-20 23:00:04,914 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:04,914 INFO  L479      AbstractCegarLoop]: Abstraction has 14493 states and 23706 transitions.
[2020-07-20 23:00:04,914 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 23:00:04,914 INFO  L276                IsEmpty]: Start isEmpty. Operand 14493 states and 23706 transitions.
[2020-07-20 23:00:04,939 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 476
[2020-07-20 23:00:04,939 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:04,939 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:05,155 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:05,156 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:05,156 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:05,156 INFO  L82        PathProgramCache]: Analyzing trace with hash 2012901937, now seen corresponding path program 1 times
[2020-07-20 23:00:05,157 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:05,157 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567778443]
[2020-07-20 23:00:05,157 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 23:00:05,589 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:05,590 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:05,596 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:05,604 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:05,958 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 23:00:05,959 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:05,960 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567778443]
[2020-07-20 23:00:05,960 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:05,961 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:05,961 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803574544]
[2020-07-20 23:00:05,962 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:05,962 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:05,963 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:05,963 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:05,963 INFO  L87              Difference]: Start difference. First operand 14493 states and 23706 transitions. Second operand 3 states.
[2020-07-20 23:00:07,326 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:07,326 INFO  L93              Difference]: Finished difference Result 42136 states and 68973 transitions.
[2020-07-20 23:00:07,326 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:07,327 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 475
[2020-07-20 23:00:07,327 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:07,365 INFO  L225             Difference]: With dead ends: 42136
[2020-07-20 23:00:07,365 INFO  L226             Difference]: Without dead ends: 28398
[2020-07-20 23:00:07,385 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 473 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 23:00:07,408 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28398 states.
[2020-07-20 23:00:08,158 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28398 to 28396.
[2020-07-20 23:00:08,158 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28396 states.
[2020-07-20 23:00:08,191 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28396 states to 28396 states and 46290 transitions.
[2020-07-20 23:00:08,191 INFO  L78                 Accepts]: Start accepts. Automaton has 28396 states and 46290 transitions. Word has length 475
[2020-07-20 23:00:08,192 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:08,192 INFO  L479      AbstractCegarLoop]: Abstraction has 28396 states and 46290 transitions.
[2020-07-20 23:00:08,192 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:08,192 INFO  L276                IsEmpty]: Start isEmpty. Operand 28396 states and 46290 transitions.
[2020-07-20 23:00:08,227 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-07-20 23:00:08,227 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:08,228 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:08,441 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:08,442 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:08,443 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:08,443 INFO  L82        PathProgramCache]: Analyzing trace with hash 1870109848, now seen corresponding path program 1 times
[2020-07-20 23:00:08,444 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:08,444 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1801743156]
[2020-07-20 23:00:08,445 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 23:00:09,458 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 23:00:09,458 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:09,461 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1422 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:09,467 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:09,550 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 23:00:09,550 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:09,551 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1801743156]
[2020-07-20 23:00:09,551 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:09,551 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:09,551 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907611393]
[2020-07-20 23:00:09,552 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:09,552 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:09,552 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:09,552 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:09,552 INFO  L87              Difference]: Start difference. First operand 28396 states and 46290 transitions. Second operand 3 states.
[2020-07-20 23:00:10,993 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:10,993 INFO  L93              Difference]: Finished difference Result 81600 states and 132828 transitions.
[2020-07-20 23:00:10,994 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:10,994 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 476
[2020-07-20 23:00:10,994 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:11,044 INFO  L225             Difference]: With dead ends: 81600
[2020-07-20 23:00:11,044 INFO  L226             Difference]: Without dead ends: 55010
[2020-07-20 23:00:11,063 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 474 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 23:00:11,107 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55010 states.
[2020-07-20 23:00:12,027 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55010 to 28648.
[2020-07-20 23:00:12,028 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28648 states.
[2020-07-20 23:00:12,061 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28648 states to 28648 states and 46654 transitions.
[2020-07-20 23:00:12,061 INFO  L78                 Accepts]: Start accepts. Automaton has 28648 states and 46654 transitions. Word has length 476
[2020-07-20 23:00:12,062 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:12,062 INFO  L479      AbstractCegarLoop]: Abstraction has 28648 states and 46654 transitions.
[2020-07-20 23:00:12,062 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:12,062 INFO  L276                IsEmpty]: Start isEmpty. Operand 28648 states and 46654 transitions.
[2020-07-20 23:00:12,081 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 478
[2020-07-20 23:00:12,081 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:12,082 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:12,287 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:12,288 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:12,289 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:12,289 INFO  L82        PathProgramCache]: Analyzing trace with hash 194150838, now seen corresponding path program 1 times
[2020-07-20 23:00:12,289 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:12,290 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1983458688]
[2020-07-20 23:00:12,290 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 23:00:12,739 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:12,739 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:12,744 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1643 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 23:00:12,752 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:13,021 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 23:00:13,022 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:13,022 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1983458688]
[2020-07-20 23:00:13,022 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:13,022 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 23:00:13,022 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946541392]
[2020-07-20 23:00:13,023 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 23:00:13,023 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:13,023 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 23:00:13,023 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 23:00:13,023 INFO  L87              Difference]: Start difference. First operand 28648 states and 46654 transitions. Second operand 4 states.
[2020-07-20 23:00:14,958 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:14,958 INFO  L93              Difference]: Finished difference Result 83282 states and 135681 transitions.
[2020-07-20 23:00:14,959 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 23:00:14,959 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 477
[2020-07-20 23:00:14,959 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:15,011 INFO  L225             Difference]: With dead ends: 83282
[2020-07-20 23:00:15,011 INFO  L226             Difference]: Without dead ends: 55724
[2020-07-20 23:00:15,036 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 23:00:15,077 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55724 states.
[2020-07-20 23:00:18,125 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55724 to 55722.
[2020-07-20 23:00:18,125 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55722 states.
[2020-07-20 23:00:18,189 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55722 states to 55722 states and 90326 transitions.
[2020-07-20 23:00:18,190 INFO  L78                 Accepts]: Start accepts. Automaton has 55722 states and 90326 transitions. Word has length 477
[2020-07-20 23:00:18,190 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:18,190 INFO  L479      AbstractCegarLoop]: Abstraction has 55722 states and 90326 transitions.
[2020-07-20 23:00:18,190 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 23:00:18,190 INFO  L276                IsEmpty]: Start isEmpty. Operand 55722 states and 90326 transitions.
[2020-07-20 23:00:18,242 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 480
[2020-07-20 23:00:18,242 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:18,243 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:18,457 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:18,458 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:18,458 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:18,459 INFO  L82        PathProgramCache]: Analyzing trace with hash 1755836514, now seen corresponding path program 1 times
[2020-07-20 23:00:18,459 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:18,459 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092641096]
[2020-07-20 23:00:18,460 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 23:00:18,902 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:18,902 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:18,908 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1642 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:18,913 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:19,083 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 23:00:19,084 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:19,084 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092641096]
[2020-07-20 23:00:19,084 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:19,084 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:19,084 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231024558]
[2020-07-20 23:00:19,085 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:19,085 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:19,085 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:19,086 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:19,086 INFO  L87              Difference]: Start difference. First operand 55722 states and 90326 transitions. Second operand 3 states.
[2020-07-20 23:00:22,728 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:22,729 INFO  L93              Difference]: Finished difference Result 160130 states and 259428 transitions.
[2020-07-20 23:00:22,729 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:22,729 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 479
[2020-07-20 23:00:22,730 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:22,837 INFO  L225             Difference]: With dead ends: 160130
[2020-07-20 23:00:22,837 INFO  L226             Difference]: Without dead ends: 107896
[2020-07-20 23:00:22,873 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 477 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 23:00:22,939 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 107896 states.
[2020-07-20 23:00:28,310 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 107896 to 107894.
[2020-07-20 23:00:28,311 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 107894 states.
[2020-07-20 23:00:28,439 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 107894 states to 107894 states and 174122 transitions.
[2020-07-20 23:00:28,439 INFO  L78                 Accepts]: Start accepts. Automaton has 107894 states and 174122 transitions. Word has length 479
[2020-07-20 23:00:28,440 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:28,440 INFO  L479      AbstractCegarLoop]: Abstraction has 107894 states and 174122 transitions.
[2020-07-20 23:00:28,440 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:28,440 INFO  L276                IsEmpty]: Start isEmpty. Operand 107894 states and 174122 transitions.
[2020-07-20 23:00:28,512 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 481
[2020-07-20 23:00:28,512 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:28,512 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:28,713 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:28,713 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:28,714 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:28,714 INFO  L82        PathProgramCache]: Analyzing trace with hash -1946224242, now seen corresponding path program 1 times
[2020-07-20 23:00:28,715 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:28,715 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [802194550]
[2020-07-20 23:00:28,715 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 23:00:29,433 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:29,434 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:29,438 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1642 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:29,445 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:29,535 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 23:00:29,536 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:29,536 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [802194550]
[2020-07-20 23:00:29,536 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:29,536 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:29,536 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521012978]
[2020-07-20 23:00:29,537 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:29,537 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:29,537 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:29,537 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:29,537 INFO  L87              Difference]: Start difference. First operand 107894 states and 174122 transitions. Second operand 3 states.
[2020-07-20 23:00:37,926 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:37,926 INFO  L93              Difference]: Finished difference Result 320406 states and 517077 transitions.
[2020-07-20 23:00:37,927 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:37,927 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 480
[2020-07-20 23:00:37,927 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:38,158 INFO  L225             Difference]: With dead ends: 320406
[2020-07-20 23:00:38,159 INFO  L226             Difference]: Without dead ends: 213782
[2020-07-20 23:00:38,233 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 478 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 23:00:38,369 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 213782 states.
[2020-07-20 23:00:45,737 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 213782 to 108364.
[2020-07-20 23:00:45,737 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 108364 states.
[2020-07-20 23:00:45,875 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 108364 states to 108364 states and 174842 transitions.
[2020-07-20 23:00:45,875 INFO  L78                 Accepts]: Start accepts. Automaton has 108364 states and 174842 transitions. Word has length 480
[2020-07-20 23:00:45,876 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:00:45,876 INFO  L479      AbstractCegarLoop]: Abstraction has 108364 states and 174842 transitions.
[2020-07-20 23:00:45,876 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:00:45,876 INFO  L276                IsEmpty]: Start isEmpty. Operand 108364 states and 174842 transitions.
[2020-07-20 23:00:45,947 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 482
[2020-07-20 23:00:45,947 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:00:45,947 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:00:46,153 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:00:46,154 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:00:46,154 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:00:46,155 INFO  L82        PathProgramCache]: Analyzing trace with hash 1097736007, now seen corresponding path program 1 times
[2020-07-20 23:00:46,155 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:00:46,155 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738406556]
[2020-07-20 23:00:46,156 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 23:00:46,582 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:00:46,582 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:00:46,587 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:00:46,592 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:00:46,780 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 23:00:46,780 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:00:46,780 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738406556]
[2020-07-20 23:00:46,780 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:00:46,780 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:00:46,781 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205110663]
[2020-07-20 23:00:46,781 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:00:46,781 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:00:46,781 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:00:46,781 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:00:46,782 INFO  L87              Difference]: Start difference. First operand 108364 states and 174842 transitions. Second operand 3 states.
[2020-07-20 23:00:54,740 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:00:54,740 INFO  L93              Difference]: Finished difference Result 314991 states and 507697 transitions.
[2020-07-20 23:00:54,741 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:00:54,741 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 481
[2020-07-20 23:00:54,741 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:00:54,976 INFO  L225             Difference]: With dead ends: 314991
[2020-07-20 23:00:54,976 INFO  L226             Difference]: Without dead ends: 212775
[2020-07-20 23:00:55,427 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 479 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 23:00:55,542 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 212775 states.
[2020-07-20 23:01:07,927 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 212775 to 212773.
[2020-07-20 23:01:07,927 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 212773 states.
[2020-07-20 23:01:08,535 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 212773 states to 212773 states and 341865 transitions.
[2020-07-20 23:01:08,535 INFO  L78                 Accepts]: Start accepts. Automaton has 212773 states and 341865 transitions. Word has length 481
[2020-07-20 23:01:08,535 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:01:08,536 INFO  L479      AbstractCegarLoop]: Abstraction has 212773 states and 341865 transitions.
[2020-07-20 23:01:08,536 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:01:08,536 INFO  L276                IsEmpty]: Start isEmpty. Operand 212773 states and 341865 transitions.
[2020-07-20 23:01:08,669 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 482
[2020-07-20 23:01:08,669 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:01:08,670 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:01:08,881 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:01:08,881 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:01:08,881 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:01:08,882 INFO  L82        PathProgramCache]: Analyzing trace with hash -856386462, now seen corresponding path program 1 times
[2020-07-20 23:01:08,882 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:01:08,883 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744386572]
[2020-07-20 23:01:08,883 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 23:01:09,264 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 23:01:09,264 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:01:09,268 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1426 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:01:09,273 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:01:09,361 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 23:01:09,361 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:01:09,362 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744386572]
[2020-07-20 23:01:09,362 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:01:09,362 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:01:09,362 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147984805]
[2020-07-20 23:01:09,363 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:01:09,363 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:01:09,363 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:01:09,363 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:01:09,363 INFO  L87              Difference]: Start difference. First operand 212773 states and 341865 transitions. Second operand 3 states.
[2020-07-20 23:01:30,662 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:01:30,662 INFO  L93              Difference]: Finished difference Result 633555 states and 1017801 transitions.
[2020-07-20 23:01:30,662 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:01:30,663 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 481
[2020-07-20 23:01:30,663 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:01:31,114 INFO  L225             Difference]: With dead ends: 633555
[2020-07-20 23:01:31,114 INFO  L226             Difference]: Without dead ends: 422517
[2020-07-20 23:01:31,242 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 479 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 23:01:31,504 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 422517 states.
[2020-07-20 23:01:47,892 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 422517 to 213474.
[2020-07-20 23:01:47,893 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 213474 states.
[2020-07-20 23:01:48,170 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 213474 states to 213474 states and 342845 transitions.
[2020-07-20 23:01:48,170 INFO  L78                 Accepts]: Start accepts. Automaton has 213474 states and 342845 transitions. Word has length 481
[2020-07-20 23:01:48,170 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:01:48,170 INFO  L479      AbstractCegarLoop]: Abstraction has 213474 states and 342845 transitions.
[2020-07-20 23:01:48,170 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:01:48,171 INFO  L276                IsEmpty]: Start isEmpty. Operand 213474 states and 342845 transitions.
[2020-07-20 23:01:48,316 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 483
[2020-07-20 23:01:48,316 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:01:48,317 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:01:48,517 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:01:48,518 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:01:48,518 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:01:48,519 INFO  L82        PathProgramCache]: Analyzing trace with hash -1968471478, now seen corresponding path program 1 times
[2020-07-20 23:01:48,519 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:01:48,520 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846220907]
[2020-07-20 23:01:48,520 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 23:01:48,920 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 23:01:48,921 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:01:48,925 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1426 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 23:01:48,932 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:01:49,072 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 23:01:49,073 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:01:49,073 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846220907]
[2020-07-20 23:01:49,073 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:01:49,073 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 23:01:49,074 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862266533]
[2020-07-20 23:01:49,074 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 23:01:49,074 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:01:49,075 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 23:01:49,075 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 23:01:49,075 INFO  L87              Difference]: Start difference. First operand 213474 states and 342845 transitions. Second operand 4 states.
[2020-07-20 23:02:12,113 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:02:12,113 INFO  L93              Difference]: Finished difference Result 624196 states and 1001933 transitions.
[2020-07-20 23:02:12,114 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 23:02:12,114 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 482
[2020-07-20 23:02:12,114 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:02:12,569 INFO  L225             Difference]: With dead ends: 624196
[2020-07-20 23:02:12,569 INFO  L226             Difference]: Without dead ends: 418652
[2020-07-20 23:02:12,706 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 23:02:12,971 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 418652 states.
[2020-07-20 23:02:45,782 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 418652 to 418650.
[2020-07-20 23:02:45,783 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 418650 states.
[2020-07-20 23:02:46,722 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 418650 states to 418650 states and 668685 transitions.
[2020-07-20 23:02:46,722 INFO  L78                 Accepts]: Start accepts. Automaton has 418650 states and 668685 transitions. Word has length 482
[2020-07-20 23:02:46,723 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:02:46,723 INFO  L479      AbstractCegarLoop]: Abstraction has 418650 states and 668685 transitions.
[2020-07-20 23:02:46,723 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 23:02:46,723 INFO  L276                IsEmpty]: Start isEmpty. Operand 418650 states and 668685 transitions.
[2020-07-20 23:02:47,003 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 483
[2020-07-20 23:02:47,004 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:02:47,004 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:02:47,211 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:02:47,211 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:02:47,211 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:02:47,212 INFO  L82        PathProgramCache]: Analyzing trace with hash 904562055, now seen corresponding path program 1 times
[2020-07-20 23:02:47,212 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:02:47,212 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1206035784]
[2020-07-20 23:02:47,213 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 23:02:47,684 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:02:47,684 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:02:47,690 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:02:47,696 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:02:47,825 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 23:02:47,825 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:02:47,825 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1206035784]
[2020-07-20 23:02:47,826 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:02:47,826 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:02:47,826 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785119166]
[2020-07-20 23:02:47,827 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:02:47,827 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:02:47,827 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:02:47,827 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:02:47,827 INFO  L87              Difference]: Start difference. First operand 418650 states and 668685 transitions. Second operand 3 states.
[2020-07-20 23:03:36,272 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:03:36,272 INFO  L93              Difference]: Finished difference Result 1246937 states and 1991095 transitions.
[2020-07-20 23:03:36,273 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:03:36,273 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 482
[2020-07-20 23:03:36,273 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:03:37,234 INFO  L225             Difference]: With dead ends: 1246937
[2020-07-20 23:03:37,234 INFO  L226             Difference]: Without dead ends: 830234
[2020-07-20 23:03:37,533 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 480 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 23:03:38,104 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 830234 states.
[2020-07-20 23:04:14,816 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 830234 to 420920.
[2020-07-20 23:04:14,816 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 420920 states.
[2020-07-20 23:04:15,933 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 420920 states to 420920 states and 672038 transitions.
[2020-07-20 23:04:15,933 INFO  L78                 Accepts]: Start accepts. Automaton has 420920 states and 672038 transitions. Word has length 482
[2020-07-20 23:04:15,934 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:04:15,934 INFO  L479      AbstractCegarLoop]: Abstraction has 420920 states and 672038 transitions.
[2020-07-20 23:04:15,934 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:04:15,934 INFO  L276                IsEmpty]: Start isEmpty. Operand 420920 states and 672038 transitions.
[2020-07-20 23:04:16,231 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 484
[2020-07-20 23:04:16,231 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:04:16,231 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:04:16,432 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:04:16,432 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:04:16,433 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:04:16,433 INFO  L82        PathProgramCache]: Analyzing trace with hash -909970932, now seen corresponding path program 1 times
[2020-07-20 23:04:16,434 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:04:16,434 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768695412]
[2020-07-20 23:04:16,435 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 23:04:16,878 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:04:16,878 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:04:16,883 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 23:04:16,889 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:04:16,984 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 23:04:16,985 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:04:16,985 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768695412]
[2020-07-20 23:04:16,985 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:04:16,985 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 23:04:16,985 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602413098]
[2020-07-20 23:04:16,986 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 23:04:16,986 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:04:16,986 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 23:04:16,987 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 23:04:16,987 INFO  L87              Difference]: Start difference. First operand 420920 states and 672038 transitions. Second operand 4 states.
[2020-07-20 23:04:51,779 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:04:51,779 INFO  L93              Difference]: Finished difference Result 933909 states and 1498532 transitions.
[2020-07-20 23:04:51,779 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 23:04:51,779 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 483
[2020-07-20 23:04:51,780 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:04:52,389 INFO  L225             Difference]: With dead ends: 933909
[2020-07-20 23:04:52,389 INFO  L226             Difference]: Without dead ends: 514367
[2020-07-20 23:04:52,620 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 23:04:52,967 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 514367 states.
[2020-07-20 23:05:27,829 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 514367 to 425374.
[2020-07-20 23:05:27,830 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 425374 states.
[2020-07-20 23:05:36,223 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 425374 states to 425374 states and 679213 transitions.
[2020-07-20 23:05:36,223 INFO  L78                 Accepts]: Start accepts. Automaton has 425374 states and 679213 transitions. Word has length 483
[2020-07-20 23:05:36,223 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:05:36,224 INFO  L479      AbstractCegarLoop]: Abstraction has 425374 states and 679213 transitions.
[2020-07-20 23:05:36,224 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 23:05:36,224 INFO  L276                IsEmpty]: Start isEmpty. Operand 425374 states and 679213 transitions.
[2020-07-20 23:05:36,536 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 485
[2020-07-20 23:05:36,536 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:05:36,536 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:05:36,737 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:05:36,738 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:05:36,738 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:05:36,738 INFO  L82        PathProgramCache]: Analyzing trace with hash 2041955258, now seen corresponding path program 1 times
[2020-07-20 23:05:36,739 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:05:36,739 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497009819]
[2020-07-20 23:05:36,739 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 23:05:37,120 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 23:05:37,120 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:05:37,125 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1428 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:05:37,130 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:05:37,224 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 23:05:37,224 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:05:37,224 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497009819]
[2020-07-20 23:05:37,224 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:05:37,224 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:05:37,225 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84996787]
[2020-07-20 23:05:37,225 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:05:37,225 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:05:37,225 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:05:37,226 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:05:37,226 INFO  L87              Difference]: Start difference. First operand 425374 states and 679213 transitions. Second operand 3 states.
[2020-07-20 23:06:33,742 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:06:33,743 INFO  L93              Difference]: Finished difference Result 1254854 states and 2003132 transitions.
[2020-07-20 23:06:33,743 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:06:33,743 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 484
[2020-07-20 23:06:33,744 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:06:35,335 INFO  L225             Difference]: With dead ends: 1254854
[2020-07-20 23:06:35,336 INFO  L226             Difference]: Without dead ends: 834886
[2020-07-20 23:06:35,614 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 482 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 23:06:36,196 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 834886 states.
[2020-07-20 23:07:18,026 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 834886 to 425120.
[2020-07-20 23:07:18,026 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 425120 states.
[2020-07-20 23:07:18,706 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 425120 states to 425120 states and 678794 transitions.
[2020-07-20 23:07:18,706 INFO  L78                 Accepts]: Start accepts. Automaton has 425120 states and 678794 transitions. Word has length 484
[2020-07-20 23:07:18,707 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:07:18,707 INFO  L479      AbstractCegarLoop]: Abstraction has 425120 states and 678794 transitions.
[2020-07-20 23:07:18,707 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 23:07:18,707 INFO  L276                IsEmpty]: Start isEmpty. Operand 425120 states and 678794 transitions.
[2020-07-20 23:07:19,075 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 486
[2020-07-20 23:07:19,075 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:07:19,075 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:07:19,276 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:07:19,276 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:07:19,277 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:07:19,277 INFO  L82        PathProgramCache]: Analyzing trace with hash 2107384319, now seen corresponding path program 1 times
[2020-07-20 23:07:19,277 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:07:19,278 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955418081]
[2020-07-20 23:07:19,278 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 23:07:19,699 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:07:19,700 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:07:19,704 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1651 conjuncts, 5 conjunts are in the unsatisfiable core
[2020-07-20 23:07:19,710 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:07:20,512 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 23:07:20,512 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:07:20,513 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955418081]
[2020-07-20 23:07:20,513 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:07:20,513 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 23:07:20,513 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395010806]
[2020-07-20 23:07:20,514 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 23:07:20,514 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:07:20,514 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 23:07:20,514 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 23:07:20,514 INFO  L87              Difference]: Start difference. First operand 425120 states and 678794 transitions. Second operand 4 states.
[2020-07-20 23:08:20,518 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:08:20,518 INFO  L93              Difference]: Finished difference Result 1214941 states and 1934824 transitions.
[2020-07-20 23:08:20,519 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 23:08:20,519 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 485
[2020-07-20 23:08:20,519 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:08:21,558 INFO  L225             Difference]: With dead ends: 1214941
[2020-07-20 23:08:21,558 INFO  L226             Difference]: Without dead ends: 833755
[2020-07-20 23:08:21,829 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-07-20 23:08:22,410 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 833755 states.
[2020-07-20 23:09:09,677 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 833755 to 467057.
[2020-07-20 23:09:09,677 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 467057 states.
[2020-07-20 23:09:10,398 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 467057 states to 467057 states and 749662 transitions.
[2020-07-20 23:09:10,399 INFO  L78                 Accepts]: Start accepts. Automaton has 467057 states and 749662 transitions. Word has length 485
[2020-07-20 23:09:10,399 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 23:09:10,399 INFO  L479      AbstractCegarLoop]: Abstraction has 467057 states and 749662 transitions.
[2020-07-20 23:09:10,399 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 23:09:10,399 INFO  L276                IsEmpty]: Start isEmpty. Operand 467057 states and 749662 transitions.
[2020-07-20 23:09:11,570 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 487
[2020-07-20 23:09:11,570 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 23:09:11,570 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 23:09:11,771 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 23:09:11,771 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 23:09:11,772 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 23:09:11,772 INFO  L82        PathProgramCache]: Analyzing trace with hash -1959139363, now seen corresponding path program 1 times
[2020-07-20 23:09:11,773 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 23:09:11,773 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526883210]
[2020-07-20 23:09:11,773 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 23:09:12,222 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 23:09:12,223 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 23:09:12,229 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1649 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 23:09:12,233 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 23:09:12,330 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 23:09:12,330 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 23:09:12,330 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526883210]
[2020-07-20 23:09:12,330 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 23:09:12,330 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 23:09:12,330 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386170187]
[2020-07-20 23:09:12,331 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 23:09:12,331 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 23:09:12,331 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 23:09:12,332 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 23:09:12,332 INFO  L87              Difference]: Start difference. First operand 467057 states and 749662 transitions. Second operand 3 states.
[2020-07-20 23:10:15,295 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 23:10:15,295 INFO  L93              Difference]: Finished difference Result 1238383 states and 1976581 transitions.
[2020-07-20 23:10:15,296 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 23:10:15,296 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 486
[2020-07-20 23:10:15,296 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 23:10:16,917 INFO  L225             Difference]: With dead ends: 1238383
[2020-07-20 23:10:16,917 INFO  L226             Difference]: Without dead ends: 830698
[2020-07-20 23:10:17,191 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 484 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 23:10:17,727 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 830698 states.