/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 18:24:14,716 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 18:24:14,719 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 18:24:14,737 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 18:24:14,737 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 18:24:14,739 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 18:24:14,741 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-20 18:24:14,751 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-20 18:24:14,756 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-20 18:24:14,759 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-20 18:24:14,760 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-07-20 18:24:14,761 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-20 18:24:14,761 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 18:24:14,763 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 18:24:14,765 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 18:24:14,767 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 18:24:14,768 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 18:24:14,769 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 18:24:14,771 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 18:24:14,775 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 18:24:14,779 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 18:24:14,783 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 18:24:14,784 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 18:24:14,784 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 18:24:14,786 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 18:24:14,787 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 18:24:14,787 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 18:24:14,789 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 18:24:14,789 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 18:24:14,790 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 18:24:14,790 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-07-20 18:24:14,791 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-07-20 18:24:14,792 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-07-20 18:24:14,793 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-07-20 18:24:14,794 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-20 18:24:14,794 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-07-20 18:24:14,795 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 18:24:14,797 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 18:24:14,798 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 18:24:14,825 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 18:24:14,826 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 18:24:14,827 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 18:24:14,827 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 18:24:14,827 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 18:24:14,832 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 18:24:14,832 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 18:24:14,832 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 18:24:14,832 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 18:24:14,833 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 18:24:14,833 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 18:24:14,833 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 18:24:14,833 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 18:24:14,834 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 18:24:14,834 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 18:24:14,834 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 18:24:14,834 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 18:24:14,835 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 18:24:14,835 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 18:24:14,835 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 18:24:14,835 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 18:24:14,835 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 18:24:14,836 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 18:24:14,836 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 18:24:14,836 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 18:24:14,837 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 18:24:14,837 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:14,837 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 18:24:14,837 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 18:24:14,837 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-20 18:24:15,116 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 18:24:15,135 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 18:24:15,139 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 18:24:15,140 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 18:24:15,142 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 18:24:15,143 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-07-20 18:24:15,220 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d85e7b9/e7816da7ec30445f9be9d8cf604cfe45/FLAGdce5b446e
[2020-07-20 18:24:15,952 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 18:24:15,952 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/seq-mthreaded-reduced/pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-07-20 18:24:15,977 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d85e7b9/e7816da7ec30445f9be9d8cf604cfe45/FLAGdce5b446e
[2020-07-20 18:24:16,077 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f4d85e7b9/e7816da7ec30445f9be9d8cf604cfe45
[2020-07-20 18:24:16,085 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 18:24:16,088 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 18:24:16,089 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 18:24:16,089 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 18:24:16,092 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 18:24:16,093 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:24:16" (1/1) ...
[2020-07-20 18:24:16,096 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52ab4010 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:16, skipping insertion in model container
[2020-07-20 18:24:16,096 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:24:16" (1/1) ...
[2020-07-20 18:24:16,103 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 18:24:16,294 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 18:24:17,965 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 18:24:17,988 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 18:24:18,922 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 18:24:18,947 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 18:24:18,948 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18 WrapperNode
[2020-07-20 18:24:18,948 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 18:24:18,949 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 18:24:18,949 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 18:24:18,949 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 18:24:18,965 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:18,965 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,002 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,003 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,081 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,124 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,134 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (1/1) ...
[2020-07-20 18:24:19,151 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 18:24:19,151 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 18:24:19,151 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 18:24:19,152 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 18:24:19,153 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (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 18:24:19,236 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 18:24:19,236 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 18:24:19,236 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-07-20 18:24:19,237 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 18:24:19,237 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 18:24:19,238 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-07-20 18:24:19,238 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-07-20 18:24:19,239 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-07-20 18:24:19,239 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-07-20 18:24:19,239 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-07-20 18:24:19,240 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-07-20 18:24:19,240 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-07-20 18:24:19,241 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-07-20 18:24:19,241 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-07-20 18:24:19,241 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-07-20 18:24:19,242 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-07-20 18:24:19,242 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-07-20 18:24:19,242 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-07-20 18:24:19,243 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-07-20 18:24:19,243 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 18:24:19,243 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 18:24:19,244 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 18:24:23,557 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 18:24:23,557 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 18:24:23,572 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:24:23 BoogieIcfgContainer
[2020-07-20 18:24:23,573 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 18:24:23,575 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 18:24:23,575 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 18:24:23,578 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 18:24:23,579 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:24:16" (1/3) ...
[2020-07-20 18:24:23,580 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2904bf70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:24:23, skipping insertion in model container
[2020-07-20 18:24:23,581 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:24:18" (2/3) ...
[2020-07-20 18:24:23,581 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2904bf70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:24:23, skipping insertion in model container
[2020-07-20 18:24:23,581 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:24:23" (3/3) ...
[2020-07-20 18:24:23,585 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_floodmax.5.2.ufo.BOUNDED-10.pals.c.v+lhb-reducer.c
[2020-07-20 18:24:23,594 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 18:24:23,603 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations.
[2020-07-20 18:24:23,618 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 2 error locations.
[2020-07-20 18:24:23,674 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 18:24:23,674 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 18:24:23,674 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 18:24:23,675 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 18:24:23,675 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 18:24:23,675 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 18:24:23,675 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 18:24:23,675 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 18:24:23,716 INFO  L276                IsEmpty]: Start isEmpty. Operand 1371 states.
[2020-07-20 18:24:23,772 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 465
[2020-07-20 18:24:23,772 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:23,774 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]
[2020-07-20 18:24:23,775 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:23,782 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:23,783 INFO  L82        PathProgramCache]: Analyzing trace with hash -856462850, now seen corresponding path program 1 times
[2020-07-20 18:24:23,792 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:23,792 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976563924]
[2020-07-20 18:24:23,793 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 18:24:24,519 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:24:24,519 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:24,533 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2743 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 18:24:24,557 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:24,997 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 18:24:24,998 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:24,999 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976563924]
[2020-07-20 18:24:25,000 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:25,000 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:24:25,001 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320492222]
[2020-07-20 18:24:25,007 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:24:25,008 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:25,021 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:24:25,022 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:24:25,024 INFO  L87              Difference]: Start difference. First operand 1371 states. Second operand 4 states.
[2020-07-20 18:24:25,479 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:25,480 INFO  L93              Difference]: Finished difference Result 4011 states and 7259 transitions.
[2020-07-20 18:24:25,480 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 18:24:25,482 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 464
[2020-07-20 18:24:25,483 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:25,514 INFO  L225             Difference]: With dead ends: 4011
[2020-07-20 18:24:25,514 INFO  L226             Difference]: Without dead ends: 2675
[2020-07-20 18:24:25,524 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 461 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 18:24:25,549 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2675 states.
[2020-07-20 18:24:25,712 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2675 to 2647.
[2020-07-20 18:24:25,713 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2647 states.
[2020-07-20 18:24:25,725 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 4345 transitions.
[2020-07-20 18:24:25,727 INFO  L78                 Accepts]: Start accepts. Automaton has 2647 states and 4345 transitions. Word has length 464
[2020-07-20 18:24:25,728 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:25,728 INFO  L479      AbstractCegarLoop]: Abstraction has 2647 states and 4345 transitions.
[2020-07-20 18:24:25,728 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:24:25,729 INFO  L276                IsEmpty]: Start isEmpty. Operand 2647 states and 4345 transitions.
[2020-07-20 18:24:25,743 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 467
[2020-07-20 18:24:25,744 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:25,744 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]
[2020-07-20 18:24:25,959 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:25,959 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:25,960 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:25,961 INFO  L82        PathProgramCache]: Analyzing trace with hash 1921306330, now seen corresponding path program 1 times
[2020-07-20 18:24:25,961 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:25,962 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588889292]
[2020-07-20 18:24:25,962 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 18:24:26,564 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:24:26,564 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:26,576 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2747 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:26,587 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:26,850 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 18:24:26,850 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:26,850 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588889292]
[2020-07-20 18:24:26,851 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:26,851 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:26,851 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081534868]
[2020-07-20 18:24:26,854 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:26,857 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:26,858 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:26,858 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:26,858 INFO  L87              Difference]: Start difference. First operand 2647 states and 4345 transitions. Second operand 3 states.
[2020-07-20 18:24:27,179 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:27,180 INFO  L93              Difference]: Finished difference Result 7667 states and 12552 transitions.
[2020-07-20 18:24:27,180 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:27,180 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 466
[2020-07-20 18:24:27,181 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:27,209 INFO  L225             Difference]: With dead ends: 7667
[2020-07-20 18:24:27,209 INFO  L226             Difference]: Without dead ends: 5160
[2020-07-20 18:24:27,217 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 464 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 18:24:27,224 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5160 states.
[2020-07-20 18:24:27,390 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5160 to 5129.
[2020-07-20 18:24:27,391 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5129 states.
[2020-07-20 18:24:27,412 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5129 states to 5129 states and 8382 transitions.
[2020-07-20 18:24:27,412 INFO  L78                 Accepts]: Start accepts. Automaton has 5129 states and 8382 transitions. Word has length 466
[2020-07-20 18:24:27,413 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:27,413 INFO  L479      AbstractCegarLoop]: Abstraction has 5129 states and 8382 transitions.
[2020-07-20 18:24:27,413 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:27,414 INFO  L276                IsEmpty]: Start isEmpty. Operand 5129 states and 8382 transitions.
[2020-07-20 18:24:27,427 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 468
[2020-07-20 18:24:27,428 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:27,428 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 18:24:27,642 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:27,643 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:27,644 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:27,644 INFO  L82        PathProgramCache]: Analyzing trace with hash 1941062663, now seen corresponding path program 1 times
[2020-07-20 18:24:27,645 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:27,645 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009792790]
[2020-07-20 18:24:27,646 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 18:24:28,226 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:24:28,226 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:28,237 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2748 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:28,246 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:28,351 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 18:24:28,351 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:28,351 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009792790]
[2020-07-20 18:24:28,352 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:28,352 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:28,352 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910698549]
[2020-07-20 18:24:28,353 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:28,353 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:28,354 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:28,354 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:28,354 INFO  L87              Difference]: Start difference. First operand 5129 states and 8382 transitions. Second operand 3 states.
[2020-07-20 18:24:28,757 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:28,758 INFO  L93              Difference]: Finished difference Result 15198 states and 24806 transitions.
[2020-07-20 18:24:28,758 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:28,758 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 467
[2020-07-20 18:24:28,759 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:28,810 INFO  L225             Difference]: With dead ends: 15198
[2020-07-20 18:24:28,810 INFO  L226             Difference]: Without dead ends: 10137
[2020-07-20 18:24:28,824 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 18:24:28,838 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 10137 states.
[2020-07-20 18:24:29,098 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 10137 to 5157.
[2020-07-20 18:24:29,099 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5157 states.
[2020-07-20 18:24:29,110 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5157 states to 5157 states and 8424 transitions.
[2020-07-20 18:24:29,111 INFO  L78                 Accepts]: Start accepts. Automaton has 5157 states and 8424 transitions. Word has length 467
[2020-07-20 18:24:29,111 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:29,111 INFO  L479      AbstractCegarLoop]: Abstraction has 5157 states and 8424 transitions.
[2020-07-20 18:24:29,112 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:29,112 INFO  L276                IsEmpty]: Start isEmpty. Operand 5157 states and 8424 transitions.
[2020-07-20 18:24:29,125 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 469
[2020-07-20 18:24:29,126 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:29,126 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]
[2020-07-20 18:24:29,339 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:29,340 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:29,340 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:29,340 INFO  L82        PathProgramCache]: Analyzing trace with hash -1266341259, now seen corresponding path program 1 times
[2020-07-20 18:24:29,341 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:29,341 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475845199]
[2020-07-20 18:24:29,342 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 18:24:29,891 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:24:29,891 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:29,902 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2747 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:29,910 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:30,130 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 18:24:30,130 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:30,130 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475845199]
[2020-07-20 18:24:30,131 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:30,131 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:30,131 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006815735]
[2020-07-20 18:24:30,132 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:30,132 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:30,132 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:30,132 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:30,132 INFO  L87              Difference]: Start difference. First operand 5157 states and 8424 transitions. Second operand 3 states.
[2020-07-20 18:24:30,575 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:30,575 INFO  L93              Difference]: Finished difference Result 15176 states and 24770 transitions.
[2020-07-20 18:24:30,576 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:30,576 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 468
[2020-07-20 18:24:30,577 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:30,625 INFO  L225             Difference]: With dead ends: 15176
[2020-07-20 18:24:30,625 INFO  L226             Difference]: Without dead ends: 10188
[2020-07-20 18:24:30,639 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 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 18:24:30,654 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 10188 states.
[2020-07-20 18:24:31,016 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 10188 to 10162.
[2020-07-20 18:24:31,016 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 10162 states.
[2020-07-20 18:24:31,041 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 10162 states to 10162 states and 16544 transitions.
[2020-07-20 18:24:31,042 INFO  L78                 Accepts]: Start accepts. Automaton has 10162 states and 16544 transitions. Word has length 468
[2020-07-20 18:24:31,043 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:31,043 INFO  L479      AbstractCegarLoop]: Abstraction has 10162 states and 16544 transitions.
[2020-07-20 18:24:31,043 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:31,043 INFO  L276                IsEmpty]: Start isEmpty. Operand 10162 states and 16544 transitions.
[2020-07-20 18:24:31,072 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 469
[2020-07-20 18:24:31,072 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:31,073 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]
[2020-07-20 18:24:31,287 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:31,288 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:31,288 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:31,289 INFO  L82        PathProgramCache]: Analyzing trace with hash 471737850, now seen corresponding path program 1 times
[2020-07-20 18:24:31,289 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:31,290 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142066500]
[2020-07-20 18:24:31,290 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 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 18:24:31,703 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:24:31,704 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:31,708 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1387 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:31,722 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:31,816 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 18:24:31,817 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:31,817 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142066500]
[2020-07-20 18:24:31,817 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:31,817 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:31,817 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260077040]
[2020-07-20 18:24:31,818 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:31,819 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:31,819 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:31,819 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:31,819 INFO  L87              Difference]: Start difference. First operand 10162 states and 16544 transitions. Second operand 3 states.
[2020-07-20 18:24:32,462 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:32,463 INFO  L93              Difference]: Finished difference Result 30178 states and 49084 transitions.
[2020-07-20 18:24:32,463 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:32,463 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 468
[2020-07-20 18:24:32,463 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:32,506 INFO  L225             Difference]: With dead ends: 30178
[2020-07-20 18:24:32,507 INFO  L226             Difference]: Without dead ends: 20139
[2020-07-20 18:24:32,531 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 466 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 18:24:32,556 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20139 states.
[2020-07-20 18:24:32,958 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20139 to 10252.
[2020-07-20 18:24:32,959 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 10252 states.
[2020-07-20 18:24:32,980 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 10252 states to 10252 states and 16668 transitions.
[2020-07-20 18:24:32,981 INFO  L78                 Accepts]: Start accepts. Automaton has 10252 states and 16668 transitions. Word has length 468
[2020-07-20 18:24:32,981 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:32,981 INFO  L479      AbstractCegarLoop]: Abstraction has 10252 states and 16668 transitions.
[2020-07-20 18:24:32,981 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:32,981 INFO  L276                IsEmpty]: Start isEmpty. Operand 10252 states and 16668 transitions.
[2020-07-20 18:24:33,007 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 470
[2020-07-20 18:24:33,007 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:33,008 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 18:24:33,222 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:33,223 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:33,223 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:33,223 INFO  L82        PathProgramCache]: Analyzing trace with hash 1272823246, now seen corresponding path program 1 times
[2020-07-20 18:24:33,223 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:33,224 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11501880]
[2020-07-20 18:24:33,224 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 18:24:33,687 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:24:33,687 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:33,695 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2558 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 18:24:33,705 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:33,808 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 18:24:33,809 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:33,809 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11501880]
[2020-07-20 18:24:33,809 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:33,810 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:24:33,810 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989270342]
[2020-07-20 18:24:33,811 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:24:33,811 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:33,812 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:24:33,812 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:24:33,812 INFO  L87              Difference]: Start difference. First operand 10252 states and 16668 transitions. Second operand 4 states.
[2020-07-20 18:24:34,466 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:34,467 INFO  L93              Difference]: Finished difference Result 22726 states and 37161 transitions.
[2020-07-20 18:24:34,467 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:24:34,467 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 469
[2020-07-20 18:24:34,468 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:34,505 INFO  L225             Difference]: With dead ends: 22726
[2020-07-20 18:24:34,505 INFO  L226             Difference]: Without dead ends: 12493
[2020-07-20 18:24:34,535 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 466 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 18:24:34,552 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 12493 states.
[2020-07-20 18:24:34,960 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 12493 to 10480.
[2020-07-20 18:24:34,961 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 10480 states.
[2020-07-20 18:24:34,978 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 10480 states to 10480 states and 17026 transitions.
[2020-07-20 18:24:34,978 INFO  L78                 Accepts]: Start accepts. Automaton has 10480 states and 17026 transitions. Word has length 469
[2020-07-20 18:24:34,979 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:34,979 INFO  L479      AbstractCegarLoop]: Abstraction has 10480 states and 17026 transitions.
[2020-07-20 18:24:34,979 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:24:34,979 INFO  L276                IsEmpty]: Start isEmpty. Operand 10480 states and 17026 transitions.
[2020-07-20 18:24:35,004 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 473
[2020-07-20 18:24:35,004 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:35,004 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]
[2020-07-20 18:24:35,219 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:35,220 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:35,221 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:35,221 INFO  L82        PathProgramCache]: Analyzing trace with hash -215519356, now seen corresponding path program 1 times
[2020-07-20 18:24:35,222 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:35,222 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772615380]
[2020-07-20 18:24:35,222 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 18:24:35,548 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:24:35,548 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:35,554 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1390 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:35,563 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:35,774 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 18:24:35,775 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:35,775 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772615380]
[2020-07-20 18:24:35,775 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:35,775 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:35,776 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144741056]
[2020-07-20 18:24:35,776 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:35,777 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:35,777 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:35,777 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:35,777 INFO  L87              Difference]: Start difference. First operand 10480 states and 17026 transitions. Second operand 3 states.
[2020-07-20 18:24:36,197 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:36,198 INFO  L93              Difference]: Finished difference Result 31267 states and 50794 transitions.
[2020-07-20 18:24:36,198 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:36,198 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 472
[2020-07-20 18:24:36,198 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:36,247 INFO  L225             Difference]: With dead ends: 31267
[2020-07-20 18:24:36,248 INFO  L226             Difference]: Without dead ends: 20815
[2020-07-20 18:24:36,276 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 18:24:36,303 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20815 states.
[2020-07-20 18:24:36,792 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20815 to 10510.
[2020-07-20 18:24:36,792 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 10510 states.
[2020-07-20 18:24:36,808 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 10510 states to 10510 states and 17069 transitions.
[2020-07-20 18:24:36,808 INFO  L78                 Accepts]: Start accepts. Automaton has 10510 states and 17069 transitions. Word has length 472
[2020-07-20 18:24:36,808 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:36,809 INFO  L479      AbstractCegarLoop]: Abstraction has 10510 states and 17069 transitions.
[2020-07-20 18:24:36,809 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:36,809 INFO  L276                IsEmpty]: Start isEmpty. Operand 10510 states and 17069 transitions.
[2020-07-20 18:24:37,397 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-07-20 18:24:37,398 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:37,398 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 18:24:37,599 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:37,599 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:37,599 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:37,600 INFO  L82        PathProgramCache]: Analyzing trace with hash -1593069581, now seen corresponding path program 1 times
[2020-07-20 18:24:37,600 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:37,601 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635120787]
[2020-07-20 18:24:37,601 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 18:24:37,917 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:24:37,917 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:37,921 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1392 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:37,930 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:38,084 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 18:24:38,085 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:38,085 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635120787]
[2020-07-20 18:24:38,085 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:38,086 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:38,086 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131953571]
[2020-07-20 18:24:38,087 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:38,087 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:38,087 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:38,087 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:38,088 INFO  L87              Difference]: Start difference. First operand 10510 states and 17069 transitions. Second operand 3 states.
[2020-07-20 18:24:38,818 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:38,818 INFO  L93              Difference]: Finished difference Result 30404 states and 49395 transitions.
[2020-07-20 18:24:38,819 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:38,819 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 473
[2020-07-20 18:24:38,819 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:38,930 INFO  L225             Difference]: With dead ends: 30404
[2020-07-20 18:24:38,930 INFO  L226             Difference]: Without dead ends: 20546
[2020-07-20 18:24:38,950 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 471 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 18:24:38,970 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20546 states.
[2020-07-20 18:24:39,515 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20546 to 20522.
[2020-07-20 18:24:39,516 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 20522 states.
[2020-07-20 18:24:39,540 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 20522 states to 20522 states and 33230 transitions.
[2020-07-20 18:24:39,541 INFO  L78                 Accepts]: Start accepts. Automaton has 20522 states and 33230 transitions. Word has length 473
[2020-07-20 18:24:39,541 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:39,541 INFO  L479      AbstractCegarLoop]: Abstraction has 20522 states and 33230 transitions.
[2020-07-20 18:24:39,541 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:39,541 INFO  L276                IsEmpty]: Start isEmpty. Operand 20522 states and 33230 transitions.
[2020-07-20 18:24:39,574 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-07-20 18:24:39,575 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:39,575 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 18:24:39,790 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:39,790 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:39,791 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:39,791 INFO  L82        PathProgramCache]: Analyzing trace with hash 531009232, now seen corresponding path program 1 times
[2020-07-20 18:24:39,792 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:39,792 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767929666]
[2020-07-20 18:24:39,793 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 18:24:40,115 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:24:40,115 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:40,119 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1393 conjuncts, 5 conjunts are in the unsatisfiable core
[2020-07-20 18:24:40,131 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:40,271 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 18:24:40,271 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:40,271 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767929666]
[2020-07-20 18:24:40,272 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:40,272 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:24:40,272 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49929908]
[2020-07-20 18:24:40,273 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:24:40,274 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:40,274 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:24:40,274 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:24:40,274 INFO  L87              Difference]: Start difference. First operand 20522 states and 33230 transitions. Second operand 4 states.
[2020-07-20 18:24:41,923 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:41,923 INFO  L93              Difference]: Finished difference Result 58526 states and 94437 transitions.
[2020-07-20 18:24:41,924 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:24:41,924 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 473
[2020-07-20 18:24:41,924 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:41,994 INFO  L225             Difference]: With dead ends: 58526
[2020-07-20 18:24:41,994 INFO  L226             Difference]: Without dead ends: 40457
[2020-07-20 18:24:42,038 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 18:24:42,083 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 40457 states.
[2020-07-20 18:24:43,034 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 40457 to 22820.
[2020-07-20 18:24:43,034 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22820 states.
[2020-07-20 18:24:43,060 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22820 states to 22820 states and 37323 transitions.
[2020-07-20 18:24:43,060 INFO  L78                 Accepts]: Start accepts. Automaton has 22820 states and 37323 transitions. Word has length 473
[2020-07-20 18:24:43,060 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:43,060 INFO  L479      AbstractCegarLoop]: Abstraction has 22820 states and 37323 transitions.
[2020-07-20 18:24:43,061 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:24:43,061 INFO  L276                IsEmpty]: Start isEmpty. Operand 22820 states and 37323 transitions.
[2020-07-20 18:24:43,078 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 474
[2020-07-20 18:24:43,078 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:43,079 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 18:24:43,288 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:43,289 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:43,289 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:43,290 INFO  L82        PathProgramCache]: Analyzing trace with hash -1005142096, now seen corresponding path program 1 times
[2020-07-20 18:24:43,291 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:43,291 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827194756]
[2020-07-20 18:24:43,291 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 18:24:43,776 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:24:43,776 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:43,783 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2562 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:43,789 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:43,883 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 18:24:43,883 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:43,884 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827194756]
[2020-07-20 18:24:43,884 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:43,884 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:43,884 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409777077]
[2020-07-20 18:24:43,885 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:43,885 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:43,885 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:43,886 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:43,886 INFO  L87              Difference]: Start difference. First operand 22820 states and 37323 transitions. Second operand 3 states.
[2020-07-20 18:24:45,704 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:45,704 INFO  L93              Difference]: Finished difference Result 68362 states and 111807 transitions.
[2020-07-20 18:24:45,705 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:45,705 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 473
[2020-07-20 18:24:45,705 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:45,776 INFO  L225             Difference]: With dead ends: 68362
[2020-07-20 18:24:45,777 INFO  L226             Difference]: Without dead ends: 45579
[2020-07-20 18:24:45,809 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 471 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 18:24:45,854 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 45579 states.
[2020-07-20 18:24:46,905 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 45579 to 22871.
[2020-07-20 18:24:46,905 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22871 states.
[2020-07-20 18:24:46,929 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22871 states to 22871 states and 37394 transitions.
[2020-07-20 18:24:46,929 INFO  L78                 Accepts]: Start accepts. Automaton has 22871 states and 37394 transitions. Word has length 473
[2020-07-20 18:24:46,929 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:46,930 INFO  L479      AbstractCegarLoop]: Abstraction has 22871 states and 37394 transitions.
[2020-07-20 18:24:46,930 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:46,930 INFO  L276                IsEmpty]: Start isEmpty. Operand 22871 states and 37394 transitions.
[2020-07-20 18:24:46,949 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 475
[2020-07-20 18:24:46,949 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:46,949 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]
[2020-07-20 18:24:47,162 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:47,163 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:47,163 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:47,164 INFO  L82        PathProgramCache]: Analyzing trace with hash -1054617598, now seen corresponding path program 1 times
[2020-07-20 18:24:47,164 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:47,165 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1693056086]
[2020-07-20 18:24:47,165 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 18:24:47,646 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:24:47,647 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:47,654 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2561 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:47,661 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:47,780 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 18:24:47,781 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:47,781 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1693056086]
[2020-07-20 18:24:47,781 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:47,782 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:47,782 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842467349]
[2020-07-20 18:24:47,782 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:47,782 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:47,783 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:47,783 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:47,783 INFO  L87              Difference]: Start difference. First operand 22871 states and 37394 transitions. Second operand 3 states.
[2020-07-20 18:24:49,278 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:49,278 INFO  L93              Difference]: Finished difference Result 68191 states and 111494 transitions.
[2020-07-20 18:24:49,279 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:49,279 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 474
[2020-07-20 18:24:49,279 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:49,334 INFO  L225             Difference]: With dead ends: 68191
[2020-07-20 18:24:49,334 INFO  L226             Difference]: Without dead ends: 45346
[2020-07-20 18:24:49,364 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 472 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 18:24:49,406 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 45346 states.
[2020-07-20 18:24:50,296 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 45346 to 22951.
[2020-07-20 18:24:50,296 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22951 states.
[2020-07-20 18:24:50,324 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22951 states to 22951 states and 37506 transitions.
[2020-07-20 18:24:50,324 INFO  L78                 Accepts]: Start accepts. Automaton has 22951 states and 37506 transitions. Word has length 474
[2020-07-20 18:24:50,324 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:50,324 INFO  L479      AbstractCegarLoop]: Abstraction has 22951 states and 37506 transitions.
[2020-07-20 18:24:50,324 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:50,324 INFO  L276                IsEmpty]: Start isEmpty. Operand 22951 states and 37506 transitions.
[2020-07-20 18:24:50,354 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 476
[2020-07-20 18:24:50,355 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:50,355 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 18:24:50,569 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:50,570 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:50,570 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:50,571 INFO  L82        PathProgramCache]: Analyzing trace with hash 2034723068, now seen corresponding path program 1 times
[2020-07-20 18:24:50,571 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:50,572 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476095224]
[2020-07-20 18:24:50,572 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 18:24:51,181 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:24:51,181 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:51,187 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2561 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 18:24:51,193 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:51,302 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 18:24:51,302 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:51,302 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476095224]
[2020-07-20 18:24:51,302 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:51,303 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:24:51,303 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147142495]
[2020-07-20 18:24:51,304 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:24:51,304 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:51,304 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:24:51,304 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:24:51,304 INFO  L87              Difference]: Start difference. First operand 22951 states and 37506 transitions. Second operand 4 states.
[2020-07-20 18:24:52,604 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:52,604 INFO  L93              Difference]: Finished difference Result 55497 states and 91574 transitions.
[2020-07-20 18:24:52,604 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:24:52,604 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 475
[2020-07-20 18:24:52,605 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:52,638 INFO  L225             Difference]: With dead ends: 55497
[2020-07-20 18:24:52,638 INFO  L226             Difference]: Without dead ends: 28725
[2020-07-20 18:24:52,671 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 472 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 18:24:52,698 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28725 states.
[2020-07-20 18:24:54,643 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28725 to 28698.
[2020-07-20 18:24:54,644 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28698 states.
[2020-07-20 18:24:54,676 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28698 states to 28698 states and 47062 transitions.
[2020-07-20 18:24:54,677 INFO  L78                 Accepts]: Start accepts. Automaton has 28698 states and 47062 transitions. Word has length 475
[2020-07-20 18:24:54,677 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:54,677 INFO  L479      AbstractCegarLoop]: Abstraction has 28698 states and 47062 transitions.
[2020-07-20 18:24:54,677 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:24:54,677 INFO  L276                IsEmpty]: Start isEmpty. Operand 28698 states and 47062 transitions.
[2020-07-20 18:24:54,699 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 477
[2020-07-20 18:24:54,700 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:54,700 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 18:24:54,901 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:54,901 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:54,901 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:54,902 INFO  L82        PathProgramCache]: Analyzing trace with hash -1978876042, now seen corresponding path program 1 times
[2020-07-20 18:24:54,902 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:54,903 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575922325]
[2020-07-20 18:24:54,903 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 18:24:55,429 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:24:55,429 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:55,436 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2756 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:24:55,443 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:24:55,566 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 18:24:55,566 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:24:55,566 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575922325]
[2020-07-20 18:24:55,567 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:24:55,567 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:24:55,567 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961407765]
[2020-07-20 18:24:55,568 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:24:55,568 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:24:55,568 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:24:55,568 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:24:55,569 INFO  L87              Difference]: Start difference. First operand 28698 states and 47062 transitions. Second operand 3 states.
[2020-07-20 18:24:57,571 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:24:57,571 INFO  L93              Difference]: Finished difference Result 83633 states and 137107 transitions.
[2020-07-20 18:24:57,571 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:24:57,571 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 476
[2020-07-20 18:24:57,572 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:24:57,634 INFO  L225             Difference]: With dead ends: 83633
[2020-07-20 18:24:57,634 INFO  L226             Difference]: Without dead ends: 55500
[2020-07-20 18:24:57,662 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 18:24:57,701 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55500 states.
[2020-07-20 18:24:59,181 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55500 to 29449.
[2020-07-20 18:24:59,182 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 29449 states.
[2020-07-20 18:24:59,216 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 29449 states to 29449 states and 48093 transitions.
[2020-07-20 18:24:59,216 INFO  L78                 Accepts]: Start accepts. Automaton has 29449 states and 48093 transitions. Word has length 476
[2020-07-20 18:24:59,216 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:24:59,216 INFO  L479      AbstractCegarLoop]: Abstraction has 29449 states and 48093 transitions.
[2020-07-20 18:24:59,217 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:24:59,217 INFO  L276                IsEmpty]: Start isEmpty. Operand 29449 states and 48093 transitions.
[2020-07-20 18:24:59,241 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 479
[2020-07-20 18:24:59,241 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:24:59,242 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]
[2020-07-20 18:24:59,454 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:24:59,455 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:24:59,455 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:24:59,456 INFO  L82        PathProgramCache]: Analyzing trace with hash -1306792617, now seen corresponding path program 1 times
[2020-07-20 18:24:59,456 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:24:59,457 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547049456]
[2020-07-20 18:24:59,459 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 18:24:59,846 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:24:59,846 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:24:59,854 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1648 conjuncts, 23 conjunts are in the unsatisfiable core
[2020-07-20 18:24:59,862 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:25:00,026 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:00,090 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:00,123 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:00,332 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:00,403 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts
[2020-07-20 18:25:00,404 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts
[2020-07-20 18:25:00,407 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 6 disjuncts
[2020-07-20 18:25:01,188 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:01,244 INFO  L501       QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts
[2020-07-20 18:25:02,407 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 18:25:02,407 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:25:02,408 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547049456]
[2020-07-20 18:25:02,408 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:25:02,408 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15
[2020-07-20 18:25:02,408 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225874496]
[2020-07-20 18:25:02,409 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-07-20 18:25:02,409 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:25:02,409 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-07-20 18:25:02,410 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210
[2020-07-20 18:25:02,410 INFO  L87              Difference]: Start difference. First operand 29449 states and 48093 transitions. Second operand 15 states.
[2020-07-20 18:25:02,653 WARN  L193               SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 72
[2020-07-20 18:25:14,703 WARN  L193               SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 47
[2020-07-20 18:25:15,769 WARN  L193               SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 52
[2020-07-20 18:25:15,997 WARN  L193               SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58
[2020-07-20 18:25:17,056 WARN  L193               SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 55
[2020-07-20 18:25:22,507 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:25:22,507 INFO  L93              Difference]: Finished difference Result 80585 states and 127434 transitions.
[2020-07-20 18:25:22,508 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. 
[2020-07-20 18:25:22,508 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 478
[2020-07-20 18:25:22,509 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:25:22,575 INFO  L225             Difference]: With dead ends: 80585
[2020-07-20 18:25:22,575 INFO  L226             Difference]: Without dead ends: 68364
[2020-07-20 18:25:22,597 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 451 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=266, Invalid=726, Unknown=0, NotChecked=0, Total=992
[2020-07-20 18:25:22,655 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 68364 states.
[2020-07-20 18:25:25,497 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 68364 to 55041.
[2020-07-20 18:25:25,497 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55041 states.
[2020-07-20 18:25:25,568 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55041 states to 55041 states and 87043 transitions.
[2020-07-20 18:25:25,569 INFO  L78                 Accepts]: Start accepts. Automaton has 55041 states and 87043 transitions. Word has length 478
[2020-07-20 18:25:25,569 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:25:25,570 INFO  L479      AbstractCegarLoop]: Abstraction has 55041 states and 87043 transitions.
[2020-07-20 18:25:25,570 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-07-20 18:25:25,570 INFO  L276                IsEmpty]: Start isEmpty. Operand 55041 states and 87043 transitions.
[2020-07-20 18:25:25,611 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 479
[2020-07-20 18:25:25,611 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:25:25,612 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]
[2020-07-20 18:25:25,818 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:25:25,818 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:25:25,818 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:25:25,819 INFO  L82        PathProgramCache]: Analyzing trace with hash 187671384, now seen corresponding path program 1 times
[2020-07-20 18:25:25,819 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:25:25,820 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348584543]
[2020-07-20 18:25:25,820 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 18:25:26,576 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:25:26,576 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:25:26,584 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2776 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 18:25:26,590 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:25:26,829 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 18:25:26,830 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:25:26,830 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348584543]
[2020-07-20 18:25:26,830 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:25:26,830 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:25:26,831 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707175427]
[2020-07-20 18:25:26,831 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:25:26,831 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:25:26,832 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:25:26,832 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:25:26,832 INFO  L87              Difference]: Start difference. First operand 55041 states and 87043 transitions. Second operand 4 states.
[2020-07-20 18:25:33,631 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:25:33,632 INFO  L93              Difference]: Finished difference Result 158804 states and 250908 transitions.
[2020-07-20 18:25:33,632 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:25:33,632 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 478
[2020-07-20 18:25:33,633 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:25:33,737 INFO  L225             Difference]: With dead ends: 158804
[2020-07-20 18:25:33,738 INFO  L226             Difference]: Without dead ends: 105507
[2020-07-20 18:25:33,778 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 475 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 18:25:33,847 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 105507 states.
[2020-07-20 18:25:39,476 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 105507 to 105134.
[2020-07-20 18:25:39,477 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 105134 states.
[2020-07-20 18:25:39,607 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 105134 states to 105134 states and 165267 transitions.
[2020-07-20 18:25:39,607 INFO  L78                 Accepts]: Start accepts. Automaton has 105134 states and 165267 transitions. Word has length 478
[2020-07-20 18:25:39,608 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:25:39,608 INFO  L479      AbstractCegarLoop]: Abstraction has 105134 states and 165267 transitions.
[2020-07-20 18:25:39,608 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:25:39,608 INFO  L276                IsEmpty]: Start isEmpty. Operand 105134 states and 165267 transitions.
[2020-07-20 18:25:39,686 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 480
[2020-07-20 18:25:39,686 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:25:39,687 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 18:25:39,887 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:25:39,888 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:25:39,888 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:25:39,889 INFO  L82        PathProgramCache]: Analyzing trace with hash 1115798282, now seen corresponding path program 1 times
[2020-07-20 18:25:39,889 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:25:39,889 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251343137]
[2020-07-20 18:25:39,890 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 18:25:40,226 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:25:40,227 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:25:40,231 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1395 conjuncts, 5 conjunts are in the unsatisfiable core
[2020-07-20 18:25:40,237 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:25:40,341 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 18:25:40,341 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:25:40,342 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251343137]
[2020-07-20 18:25:40,342 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:25:40,342 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:25:40,342 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226743563]
[2020-07-20 18:25:40,343 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:25:40,343 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:25:40,343 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:25:40,343 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:25:40,343 INFO  L87              Difference]: Start difference. First operand 105134 states and 165267 transitions. Second operand 4 states.
[2020-07-20 18:25:52,519 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:25:52,520 INFO  L93              Difference]: Finished difference Result 289666 states and 452803 transitions.
[2020-07-20 18:25:52,520 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:25:52,520 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 479
[2020-07-20 18:25:52,520 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:25:52,726 INFO  L225             Difference]: With dead ends: 289666
[2020-07-20 18:25:52,726 INFO  L226             Difference]: Without dead ends: 198059
[2020-07-20 18:25:52,805 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 476 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 18:25:52,935 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 198059 states.
[2020-07-20 18:26:02,749 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 198059 to 113038.
[2020-07-20 18:26:02,750 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 113038 states.
[2020-07-20 18:26:02,890 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 113038 states to 113038 states and 179226 transitions.
[2020-07-20 18:26:02,890 INFO  L78                 Accepts]: Start accepts. Automaton has 113038 states and 179226 transitions. Word has length 479
[2020-07-20 18:26:02,890 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:26:02,890 INFO  L479      AbstractCegarLoop]: Abstraction has 113038 states and 179226 transitions.
[2020-07-20 18:26:02,890 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:26:02,891 INFO  L276                IsEmpty]: Start isEmpty. Operand 113038 states and 179226 transitions.
[2020-07-20 18:26:02,975 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 481
[2020-07-20 18:26:02,975 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:26:02,976 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 18:26:03,176 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:26:03,177 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:26:03,177 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:26:03,178 INFO  L82        PathProgramCache]: Analyzing trace with hash 549230204, now seen corresponding path program 1 times
[2020-07-20 18:26:03,178 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:26:03,179 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885248111]
[2020-07-20 18:26:03,179 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 18:26:03,715 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:26:03,715 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:26:03,723 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2775 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:26:03,728 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:26:03,981 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 18:26:03,981 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:26:03,981 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885248111]
[2020-07-20 18:26:03,981 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:26:03,982 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:26:03,982 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248007111]
[2020-07-20 18:26:03,983 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:26:03,983 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:26:03,983 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:26:03,983 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:26:03,983 INFO  L87              Difference]: Start difference. First operand 113038 states and 179226 transitions. Second operand 3 states.
[2020-07-20 18:26:19,063 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:26:19,063 INFO  L93              Difference]: Finished difference Result 324970 states and 515202 transitions.
[2020-07-20 18:26:19,064 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:26:19,064 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 480
[2020-07-20 18:26:19,064 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:26:19,347 INFO  L225             Difference]: With dead ends: 324970
[2020-07-20 18:26:19,347 INFO  L226             Difference]: Without dead ends: 218843
[2020-07-20 18:26:19,441 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 18:26:19,584 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 218843 states.
[2020-07-20 18:26:36,186 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 218843 to 218778.
[2020-07-20 18:26:36,186 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 218778 states.
[2020-07-20 18:26:36,488 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 218778 states to 218778 states and 345809 transitions.
[2020-07-20 18:26:36,488 INFO  L78                 Accepts]: Start accepts. Automaton has 218778 states and 345809 transitions. Word has length 480
[2020-07-20 18:26:36,488 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:26:36,488 INFO  L479      AbstractCegarLoop]: Abstraction has 218778 states and 345809 transitions.
[2020-07-20 18:26:36,488 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:26:36,488 INFO  L276                IsEmpty]: Start isEmpty. Operand 218778 states and 345809 transitions.
[2020-07-20 18:26:37,083 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 483
[2020-07-20 18:26:37,084 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:26:37,084 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 18:26:37,297 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:26:37,298 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:26:37,298 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:26:37,299 INFO  L82        PathProgramCache]: Analyzing trace with hash 1415420023, now seen corresponding path program 1 times
[2020-07-20 18:26:37,299 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:26:37,299 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46459588]
[2020-07-20 18:26:37,300 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 18:26:37,822 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 18:26:37,823 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:26:37,831 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2780 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-20 18:26:37,836 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:26:38,001 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 18:26:38,001 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:26:38,001 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46459588]
[2020-07-20 18:26:38,001 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:26:38,001 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 18:26:38,002 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110919095]
[2020-07-20 18:26:38,002 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 18:26:38,003 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:26:38,003 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 18:26:38,003 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 18:26:38,003 INFO  L87              Difference]: Start difference. First operand 218778 states and 345809 transitions. Second operand 3 states.
[2020-07-20 18:27:07,583 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:27:07,583 INFO  L93              Difference]: Finished difference Result 638440 states and 1007745 transitions.
[2020-07-20 18:27:07,584 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 18:27:07,584 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 482
[2020-07-20 18:27:07,584 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:27:08,063 INFO  L225             Difference]: With dead ends: 638440
[2020-07-20 18:27:08,064 INFO  L226             Difference]: Without dead ends: 429905
[2020-07-20 18:27:08,213 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 18:27:08,481 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 429905 states.
[2020-07-20 18:27:46,927 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 429905 to 429617.
[2020-07-20 18:27:46,927 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 429617 states.
[2020-07-20 18:27:47,507 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 429617 states to 429617 states and 676029 transitions.
[2020-07-20 18:27:47,508 INFO  L78                 Accepts]: Start accepts. Automaton has 429617 states and 676029 transitions. Word has length 482
[2020-07-20 18:27:47,508 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:27:47,508 INFO  L479      AbstractCegarLoop]: Abstraction has 429617 states and 676029 transitions.
[2020-07-20 18:27:47,508 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 18:27:47,508 INFO  L276                IsEmpty]: Start isEmpty. Operand 429617 states and 676029 transitions.
[2020-07-20 18:27:47,870 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 484
[2020-07-20 18:27:47,870 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:27:47,870 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 18:27:48,070 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:27:48,071 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:27:48,071 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:27:48,072 INFO  L82        PathProgramCache]: Analyzing trace with hash -841597765, now seen corresponding path program 1 times
[2020-07-20 18:27:48,072 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:27:48,072 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639009459]
[2020-07-20 18:27:48,073 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 18:27:48,410 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 18:27:48,410 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:27:48,414 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1410 conjuncts, 5 conjunts are in the unsatisfiable core
[2020-07-20 18:27:48,420 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:27:48,524 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 18:27:48,525 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:27:48,525 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639009459]
[2020-07-20 18:27:48,525 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:27:48,525 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-07-20 18:27:48,526 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241903281]
[2020-07-20 18:27:48,526 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-07-20 18:27:48,526 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:27:48,527 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-07-20 18:27:48,527 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-07-20 18:27:48,527 INFO  L87              Difference]: Start difference. First operand 429617 states and 676029 transitions. Second operand 4 states.
[2020-07-20 18:28:55,523 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:28:55,524 INFO  L93              Difference]: Finished difference Result 1175107 states and 1833357 transitions.
[2020-07-20 18:28:55,525 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-07-20 18:28:55,525 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 483
[2020-07-20 18:28:55,525 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:28:56,483 INFO  L225             Difference]: With dead ends: 1175107
[2020-07-20 18:28:56,484 INFO  L226             Difference]: Without dead ends: 813766
[2020-07-20 18:28:56,758 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 18:28:57,296 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 813766 states.
[2020-07-20 18:29:41,942 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 813766 to 480067.
[2020-07-20 18:29:41,942 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 480067 states.
[2020-07-20 18:29:42,616 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 480067 states to 480067 states and 763693 transitions.
[2020-07-20 18:29:42,616 INFO  L78                 Accepts]: Start accepts. Automaton has 480067 states and 763693 transitions. Word has length 483
[2020-07-20 18:29:42,617 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 18:29:42,617 INFO  L479      AbstractCegarLoop]: Abstraction has 480067 states and 763693 transitions.
[2020-07-20 18:29:42,617 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-07-20 18:29:42,617 INFO  L276                IsEmpty]: Start isEmpty. Operand 480067 states and 763693 transitions.
[2020-07-20 18:29:43,055 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 485
[2020-07-20 18:29:43,055 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 18:29:43,056 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 18:29:43,256 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 18:29:43,257 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION, mainErr1ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 18:29:43,257 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 18:29:43,257 INFO  L82        PathProgramCache]: Analyzing trace with hash -1957419239, now seen corresponding path program 1 times
[2020-07-20 18:29:43,258 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 18:29:43,258 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634943349]
[2020-07-20 18:29:43,258 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 18:29:43,668 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 18:29:43,668 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 18:29:43,676 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1645 conjuncts, 18 conjunts are in the unsatisfiable core
[2020-07-20 18:29:43,683 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 18:29:45,265 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 18:29:45,265 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 18:29:45,265 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634943349]
[2020-07-20 18:29:45,265 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 18:29:45,265 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14
[2020-07-20 18:29:45,266 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251523683]
[2020-07-20 18:29:45,266 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-07-20 18:29:45,267 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 18:29:45,267 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-07-20 18:29:45,267 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182
[2020-07-20 18:29:45,267 INFO  L87              Difference]: Start difference. First operand 480067 states and 763693 transitions. Second operand 14 states.
[2020-07-20 18:34:08,799 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 18:34:08,799 INFO  L93              Difference]: Finished difference Result 2476179 states and 3891259 transitions.
[2020-07-20 18:34:08,800 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. 
[2020-07-20 18:34:08,800 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 484
[2020-07-20 18:34:08,800 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 18:34:12,985 INFO  L225             Difference]: With dead ends: 2476179
[2020-07-20 18:34:12,986 INFO  L226             Difference]: Without dead ends: 2334822
[2020-07-20 18:34:13,422 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1773 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1145, Invalid=4257, Unknown=0, NotChecked=0, Total=5402
[2020-07-20 18:34:14,922 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2334822 states.