/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_1.i


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


This is Ultimate 0.1.25-d623d84
[2020-07-21 01:58:17,831 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-21 01:58:17,835 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-21 01:58:17,854 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-21 01:58:17,854 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-21 01:58:17,857 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-21 01:58:17,859 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-21 01:58:17,865 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-21 01:58:17,867 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
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[2020-07-21 01:58:17,870 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-21 01:58:17,871 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-21 01:58:17,873 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-21 01:58:17,875 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-21 01:58:17,877 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-21 01:58:17,878 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-21 01:58:17,880 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-21 01:58:17,882 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-21 01:58:17,885 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-21 01:58:17,888 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-21 01:58:17,890 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-21 01:58:17,891 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-21 01:58:17,893 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-21 01:58:17,897 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-21 01:58:17,897 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-21 01:58:17,898 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-21 01:58:17,899 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-21 01:58:17,900 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-21 01:58:17,902 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-21 01:58:17,902 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-21 01:58:17,907 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-21 01:58:17,907 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-07-21 01:58:17,909 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-21 01:58:17,912 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-21 01:58:17,914 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
[2020-07-21 01:58:17,934 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-21 01:58:17,935 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-21 01:58:17,937 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-21 01:58:17,938 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-21 01:58:17,938 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-21 01:58:17,938 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-21 01:58:17,939 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-21 01:58:17,939 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-21 01:58:17,939 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-21 01:58:17,939 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-21 01:58:17,939 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-21 01:58:17,940 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-21 01:58:17,940 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-21 01:58:17,940 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-21 01:58:17,940 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-21 01:58:17,940 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-21 01:58:17,941 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-21 01:58:17,941 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-21 01:58:17,941 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-21 01:58:17,942 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-21 01:58:17,942 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-21 01:58:17,942 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-21 01:58:17,942 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-21 01:58:17,943 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-21 01:58:17,943 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-21 01:58:17,943 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-21 01:58:17,943 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:17,943 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-21 01:58:17,944 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-21 01:58:17,944 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 -> BIGGEST_EQUIVALENCE_CLASS
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
[2020-07-21 01:58:18,363 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-21 01:58:18,391 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-21 01:58:18,397 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-21 01:58:18,400 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-21 01:58:18,405 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-21 01:58:18,408 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-21 01:58:18,559 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8e1b6055/1fd14e7ad5b44844979d2cb5b1866706/FLAG17b234f44
[2020-07-21 01:58:19,312 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-21 01:58:19,313 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-21 01:58:19,325 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8e1b6055/1fd14e7ad5b44844979d2cb5b1866706/FLAG17b234f44
[2020-07-21 01:58:19,661 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8e1b6055/1fd14e7ad5b44844979d2cb5b1866706
[2020-07-21 01:58:19,677 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-21 01:58:19,681 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-21 01:58:19,684 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-21 01:58:19,685 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-21 01:58:19,691 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-21 01:58:19,693 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:58:19" (1/1) ...
[2020-07-21 01:58:19,698 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28fca6fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:19, skipping insertion in model container
[2020-07-21 01:58:19,699 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:58:19" (1/1) ...
[2020-07-21 01:58:19,714 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-21 01:58:19,740 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-21 01:58:19,978 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 01:58:19,993 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-21 01:58:20,015 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 01:58:20,035 INFO  L208         MainTranslator]: Completed translation
[2020-07-21 01:58:20,036 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20 WrapperNode
[2020-07-21 01:58:20,036 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-21 01:58:20,038 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-21 01:58:20,039 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-21 01:58:20,039 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-21 01:58:20,057 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,058 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,066 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,067 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,073 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,082 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,083 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (1/1) ...
[2020-07-21 01:58:20,208 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-21 01:58:20,212 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-21 01:58:20,212 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-21 01:58:20,212 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-21 01:58:20,214 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (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
[2020-07-21 01:58:20,310 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-21 01:58:20,311 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-21 01:58:20,311 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-07-21 01:58:20,311 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-07-21 01:58:20,311 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-21 01:58:20,311 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-21 01:58:20,311 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-07-21 01:58:20,312 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-07-21 01:58:20,312 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-07-21 01:58:20,312 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-21 01:58:20,313 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-21 01:58:20,313 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-21 01:58:20,313 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-21 01:58:20,581 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-21 01:58:20,582 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-07-21 01:58:20,589 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:58:20 BoogieIcfgContainer
[2020-07-21 01:58:20,589 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-21 01:58:20,592 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-21 01:58:20,592 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-21 01:58:20,598 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-21 01:58:20,598 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:58:19" (1/3) ...
[2020-07-21 01:58:20,600 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@604b9dc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:58:20, skipping insertion in model container
[2020-07-21 01:58:20,601 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:58:20" (2/3) ...
[2020-07-21 01:58:20,601 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@604b9dc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:58:20, skipping insertion in model container
[2020-07-21 01:58:20,601 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:58:20" (3/3) ...
[2020-07-21 01:58:20,604 INFO  L109   eAbstractionObserver]: Analyzing ICFG count_by_1.i
[2020-07-21 01:58:20,624 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-21 01:58:20,637 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-21 01:58:20,663 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-21 01:58:20,745 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-21 01:58:20,746 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-21 01:58:20,746 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-21 01:58:20,747 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-21 01:58:20,747 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-21 01:58:20,747 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-21 01:58:20,748 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-21 01:58:20,748 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-21 01:58:20,799 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states.
[2020-07-21 01:58:20,811 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2020-07-21 01:58:20,811 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:20,813 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:20,814 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:20,827 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:20,828 INFO  L82        PathProgramCache]: Analyzing trace with hash 650151859, now seen corresponding path program 1 times
[2020-07-21 01:58:20,844 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:20,845 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542295309]
[2020-07-21 01:58:20,845 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
[2020-07-21 01:58:20,935 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-21 01:58:20,936 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:20,940 INFO  L263         TraceCheckSpWp]: Trace formula consists of 13 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-21 01:58:20,949 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:21,036 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:21,036 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 01:58:21,038 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542295309]
[2020-07-21 01:58:21,040 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 01:58:21,041 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-21 01:58:21,044 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517464369]
[2020-07-21 01:58:21,053 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-21 01:58:21,054 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:21,072 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-21 01:58:21,074 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-21 01:58:21,078 INFO  L87              Difference]: Start difference. First operand 19 states. Second operand 3 states.
[2020-07-21 01:58:21,147 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:21,147 INFO  L93              Difference]: Finished difference Result 33 states and 38 transitions.
[2020-07-21 01:58:21,148 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-21 01:58:21,151 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 10
[2020-07-21 01:58:21,151 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:21,161 INFO  L225             Difference]: With dead ends: 33
[2020-07-21 01:58:21,162 INFO  L226             Difference]: Without dead ends: 14
[2020-07-21 01:58:21,167 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-21 01:58:21,185 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2020-07-21 01:58:21,218 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13.
[2020-07-21 01:58:21,221 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 13 states.
[2020-07-21 01:58:21,222 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions.
[2020-07-21 01:58:21,226 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10
[2020-07-21 01:58:21,227 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:21,227 INFO  L479      AbstractCegarLoop]: Abstraction has 13 states and 13 transitions.
[2020-07-21 01:58:21,227 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-21 01:58:21,227 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions.
[2020-07-21 01:58:21,228 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-07-21 01:58:21,228 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:21,229 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:21,443 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:21,444 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:21,445 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:21,445 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133927695, now seen corresponding path program 1 times
[2020-07-21 01:58:21,446 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:21,447 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439054632]
[2020-07-21 01:58:21,447 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
[2020-07-21 01:58:21,481 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-21 01:58:21,481 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:21,483 INFO  L263         TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-21 01:58:21,485 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:21,522 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:21,523 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:21,595 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:21,596 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439054632]
[2020-07-21 01:58:21,597 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:21,597 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6
[2020-07-21 01:58:21,598 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676676903]
[2020-07-21 01:58:21,600 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-07-21 01:58:21,602 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:21,602 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-07-21 01:58:21,603 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-21 01:58:21,603 INFO  L87              Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states.
[2020-07-21 01:58:21,669 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:21,670 INFO  L93              Difference]: Finished difference Result 24 states and 26 transitions.
[2020-07-21 01:58:21,671 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-07-21 01:58:21,671 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 12
[2020-07-21 01:58:21,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:21,673 INFO  L225             Difference]: With dead ends: 24
[2020-07-21 01:58:21,673 INFO  L226             Difference]: Without dead ends: 19
[2020-07-21 01:58:21,676 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-21 01:58:21,677 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-07-21 01:58:21,683 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-07-21 01:58:21,684 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-07-21 01:58:21,685 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions.
[2020-07-21 01:58:21,685 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12
[2020-07-21 01:58:21,686 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:21,686 INFO  L479      AbstractCegarLoop]: Abstraction has 19 states and 19 transitions.
[2020-07-21 01:58:21,686 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-07-21 01:58:21,687 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions.
[2020-07-21 01:58:21,687 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-07-21 01:58:21,688 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:21,688 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:21,902 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:21,903 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:21,904 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:21,905 INFO  L82        PathProgramCache]: Analyzing trace with hash -1338939477, now seen corresponding path program 2 times
[2020-07-21 01:58:21,906 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:21,907 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688790091]
[2020-07-21 01:58:21,907 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
[2020-07-21 01:58:21,942 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-21 01:58:21,942 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:21,944 INFO  L263         TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-21 01:58:21,947 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:22,037 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:22,038 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:22,184 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:22,186 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688790091]
[2020-07-21 01:58:22,186 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:22,186 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12
[2020-07-21 01:58:22,187 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572021566]
[2020-07-21 01:58:22,188 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-21 01:58:22,188 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:22,189 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-21 01:58:22,190 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-21 01:58:22,190 INFO  L87              Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 12 states.
[2020-07-21 01:58:22,305 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:22,306 INFO  L93              Difference]: Finished difference Result 36 states and 41 transitions.
[2020-07-21 01:58:22,307 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-07-21 01:58:22,307 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 18
[2020-07-21 01:58:22,308 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:22,309 INFO  L225             Difference]: With dead ends: 36
[2020-07-21 01:58:22,309 INFO  L226             Difference]: Without dead ends: 31
[2020-07-21 01:58:22,311 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-21 01:58:22,312 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-07-21 01:58:22,319 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31.
[2020-07-21 01:58:22,320 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-07-21 01:58:22,321 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions.
[2020-07-21 01:58:22,322 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 18
[2020-07-21 01:58:22,323 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:22,323 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 31 transitions.
[2020-07-21 01:58:22,323 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-21 01:58:22,323 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions.
[2020-07-21 01:58:22,324 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-07-21 01:58:22,325 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:22,325 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:22,540 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:22,541 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:22,542 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:22,543 INFO  L82        PathProgramCache]: Analyzing trace with hash 1154594463, now seen corresponding path program 3 times
[2020-07-21 01:58:22,543 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:22,543 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114396423]
[2020-07-21 01:58:22,544 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
[2020-07-21 01:58:22,605 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:58:22,606 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:22,607 INFO  L263         TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-21 01:58:22,614 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:22,955 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:22,956 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:23,450 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:23,451 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114396423]
[2020-07-21 01:58:23,451 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:23,452 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24
[2020-07-21 01:58:23,452 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929284564]
[2020-07-21 01:58:23,453 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 24 states
[2020-07-21 01:58:23,453 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:23,454 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2020-07-21 01:58:23,454 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-21 01:58:23,455 INFO  L87              Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 24 states.
[2020-07-21 01:58:23,669 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:23,670 INFO  L93              Difference]: Finished difference Result 60 states and 71 transitions.
[2020-07-21 01:58:23,671 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-07-21 01:58:23,671 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 30
[2020-07-21 01:58:23,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:23,674 INFO  L225             Difference]: With dead ends: 60
[2020-07-21 01:58:23,674 INFO  L226             Difference]: Without dead ends: 55
[2020-07-21 01:58:23,676 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-21 01:58:23,677 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-07-21 01:58:23,688 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55.
[2020-07-21 01:58:23,689 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55 states.
[2020-07-21 01:58:23,691 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions.
[2020-07-21 01:58:23,692 INFO  L78                 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 30
[2020-07-21 01:58:23,692 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:23,693 INFO  L479      AbstractCegarLoop]: Abstraction has 55 states and 55 transitions.
[2020-07-21 01:58:23,693 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2020-07-21 01:58:23,693 INFO  L276                IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions.
[2020-07-21 01:58:23,695 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 55
[2020-07-21 01:58:23,695 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:23,696 INFO  L422         BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:23,910 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:23,911 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:23,911 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:23,911 INFO  L82        PathProgramCache]: Analyzing trace with hash -1804670329, now seen corresponding path program 4 times
[2020-07-21 01:58:23,912 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:23,912 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194440642]
[2020-07-21 01:58:23,914 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
[2020-07-21 01:58:24,015 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:58:24,016 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:24,019 INFO  L263         TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 24 conjunts are in the unsatisfiable core
[2020-07-21 01:58:24,032 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:24,659 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:24,677 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:25,819 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:25,820 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194440642]
[2020-07-21 01:58:25,820 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:25,820 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48
[2020-07-21 01:58:25,821 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524567012]
[2020-07-21 01:58:25,822 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 48 states
[2020-07-21 01:58:25,823 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:25,824 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants.
[2020-07-21 01:58:25,826 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-21 01:58:25,827 INFO  L87              Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 48 states.
[2020-07-21 01:58:26,135 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:26,136 INFO  L93              Difference]: Finished difference Result 108 states and 131 transitions.
[2020-07-21 01:58:26,138 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. 
[2020-07-21 01:58:26,139 INFO  L78                 Accepts]: Start accepts. Automaton has 48 states. Word has length 54
[2020-07-21 01:58:26,140 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:26,145 INFO  L225             Difference]: With dead ends: 108
[2020-07-21 01:58:26,145 INFO  L226             Difference]: Without dead ends: 103
[2020-07-21 01:58:26,149 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-21 01:58:26,151 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 103 states.
[2020-07-21 01:58:26,183 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103.
[2020-07-21 01:58:26,184 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 103 states.
[2020-07-21 01:58:26,189 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions.
[2020-07-21 01:58:26,190 INFO  L78                 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 54
[2020-07-21 01:58:26,194 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:26,194 INFO  L479      AbstractCegarLoop]: Abstraction has 103 states and 103 transitions.
[2020-07-21 01:58:26,194 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 48 states.
[2020-07-21 01:58:26,195 INFO  L276                IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions.
[2020-07-21 01:58:26,201 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 103
[2020-07-21 01:58:26,202 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:26,207 INFO  L422         BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:26,422 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:26,423 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:26,424 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:26,424 INFO  L82        PathProgramCache]: Analyzing trace with hash 1210559063, now seen corresponding path program 5 times
[2020-07-21 01:58:26,425 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:26,426 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102797746]
[2020-07-21 01:58:26,426 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
[2020-07-21 01:58:26,493 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:58:26,494 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:26,496 INFO  L263         TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 48 conjunts are in the unsatisfiable core
[2020-07-21 01:58:26,502 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:27,975 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:27,975 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:32,685 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:32,686 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102797746]
[2020-07-21 01:58:32,686 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:32,686 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96
[2020-07-21 01:58:32,696 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337779067]
[2020-07-21 01:58:32,697 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 96 states
[2020-07-21 01:58:32,699 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:32,700 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants.
[2020-07-21 01:58:32,705 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-21 01:58:32,706 INFO  L87              Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 96 states.
[2020-07-21 01:58:33,474 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:33,474 INFO  L93              Difference]: Finished difference Result 204 states and 251 transitions.
[2020-07-21 01:58:33,475 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. 
[2020-07-21 01:58:33,475 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states. Word has length 102
[2020-07-21 01:58:33,476 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:33,479 INFO  L225             Difference]: With dead ends: 204
[2020-07-21 01:58:33,480 INFO  L226             Difference]: Without dead ends: 199
[2020-07-21 01:58:33,484 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-21 01:58:33,489 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 199 states.
[2020-07-21 01:58:33,509 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199.
[2020-07-21 01:58:33,510 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 199 states.
[2020-07-21 01:58:33,513 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions.
[2020-07-21 01:58:33,514 INFO  L78                 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 102
[2020-07-21 01:58:33,515 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:33,515 INFO  L479      AbstractCegarLoop]: Abstraction has 199 states and 199 transitions.
[2020-07-21 01:58:33,515 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 96 states.
[2020-07-21 01:58:33,515 INFO  L276                IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions.
[2020-07-21 01:58:33,519 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 199
[2020-07-21 01:58:33,520 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:33,520 INFO  L422         BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:33,729 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:33,730 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:33,731 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:33,731 INFO  L82        PathProgramCache]: Analyzing trace with hash 2113047031, now seen corresponding path program 6 times
[2020-07-21 01:58:33,732 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:33,732 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818375185]
[2020-07-21 01:58:33,732 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
[2020-07-21 01:58:33,841 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:58:33,842 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:33,845 INFO  L263         TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 96 conjunts are in the unsatisfiable core
[2020-07-21 01:58:33,856 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:58:39,420 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:39,421 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:58:55,831 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:58:55,832 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818375185]
[2020-07-21 01:58:55,832 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:58:55,832 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192
[2020-07-21 01:58:55,833 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815505108]
[2020-07-21 01:58:55,835 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 192 states
[2020-07-21 01:58:55,836 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:58:55,840 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants.
[2020-07-21 01:58:55,852 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-21 01:58:55,852 INFO  L87              Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 192 states.
[2020-07-21 01:58:58,151 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:58:58,152 INFO  L93              Difference]: Finished difference Result 396 states and 491 transitions.
[2020-07-21 01:58:58,152 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. 
[2020-07-21 01:58:58,152 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states. Word has length 198
[2020-07-21 01:58:58,155 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:58:58,159 INFO  L225             Difference]: With dead ends: 396
[2020-07-21 01:58:58,159 INFO  L226             Difference]: Without dead ends: 391
[2020-07-21 01:58:58,164 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-21 01:58:58,166 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 391 states.
[2020-07-21 01:58:58,194 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 391.
[2020-07-21 01:58:58,195 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 391 states.
[2020-07-21 01:58:58,200 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 391 transitions.
[2020-07-21 01:58:58,201 INFO  L78                 Accepts]: Start accepts. Automaton has 391 states and 391 transitions. Word has length 198
[2020-07-21 01:58:58,202 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:58:58,202 INFO  L479      AbstractCegarLoop]: Abstraction has 391 states and 391 transitions.
[2020-07-21 01:58:58,203 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 192 states.
[2020-07-21 01:58:58,203 INFO  L276                IsEmpty]: Start isEmpty. Operand 391 states and 391 transitions.
[2020-07-21 01:58:58,213 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 391
[2020-07-21 01:58:58,213 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 01:58:58,214 INFO  L422         BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 01:58:58,429 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:58:58,430 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:58:58,430 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:58:58,430 INFO  L82        PathProgramCache]: Analyzing trace with hash 1173211447, now seen corresponding path program 7 times
[2020-07-21 01:58:58,431 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:58:58,431 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470953553]
[2020-07-21 01:58:58,432 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
[2020-07-21 01:58:58,600 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:58:58,601 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:58:58,611 INFO  L263         TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 192 conjunts are in the unsatisfiable core
[2020-07-21 01:58:58,630 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:59:21,776 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:59:21,777 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 02:00:43,295 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 02:00:43,296 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470953553]
[2020-07-21 02:00:43,296 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 02:00:43,297 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384
[2020-07-21 02:00:43,297 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939582159]
[2020-07-21 02:00:43,299 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 384 states
[2020-07-21 02:00:43,299 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 02:00:43,318 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants.
[2020-07-21 02:00:43,330 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-21 02:00:43,330 INFO  L87              Difference]: Start difference. First operand 391 states and 391 transitions. Second operand 384 states.
[2020-07-21 02:00:53,223 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 02:00:53,223 INFO  L93              Difference]: Finished difference Result 780 states and 971 transitions.
[2020-07-21 02:00:53,226 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. 
[2020-07-21 02:00:53,226 INFO  L78                 Accepts]: Start accepts. Automaton has 384 states. Word has length 390
[2020-07-21 02:00:53,228 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 02:00:53,232 INFO  L225             Difference]: With dead ends: 780
[2020-07-21 02:00:53,232 INFO  L226             Difference]: Without dead ends: 775
[2020-07-21 02:00:53,237 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 779 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 103.9s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-21 02:00:53,239 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 775 states.
[2020-07-21 02:00:53,265 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 775.
[2020-07-21 02:00:53,266 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 775 states.
[2020-07-21 02:00:53,274 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 775 transitions.
[2020-07-21 02:00:53,274 INFO  L78                 Accepts]: Start accepts. Automaton has 775 states and 775 transitions. Word has length 390
[2020-07-21 02:00:53,276 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 02:00:53,276 INFO  L479      AbstractCegarLoop]: Abstraction has 775 states and 775 transitions.
[2020-07-21 02:00:53,276 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 384 states.
[2020-07-21 02:00:53,276 INFO  L276                IsEmpty]: Start isEmpty. Operand 775 states and 775 transitions.
[2020-07-21 02:00:53,314 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 775
[2020-07-21 02:00:53,314 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 02:00:53,315 INFO  L422         BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 02:00:53,529 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 02:00:53,530 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 02:00:53,530 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 02:00:53,531 INFO  L82        PathProgramCache]: Analyzing trace with hash 1601849271, now seen corresponding path program 8 times
[2020-07-21 02:00:53,531 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 02:00:53,532 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2146575992]
[2020-07-21 02:00:53,532 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
[2020-07-21 02:00:53,785 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 02:00:53,785 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 02:00:53,802 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1168 conjuncts, 384 conjunts are in the unsatisfiable core
[2020-07-21 02:00:53,824 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 02:02:44,224 INFO  L134       CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 02:02:44,225 INFO  L328         TraceCheckSpWp]: Computing backward predicates...