/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_10.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 21:49:05,546 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 21:49:05,549 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 21:49:05,570 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 21:49:05,571 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 21:49:05,572 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 21:49:05,574 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-20 21:49:05,582 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 21:49:05,583 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 21:49:05,584 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 21:49:05,585 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 21:49:05,586 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 21:49:05,588 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 21:49:05,590 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 21:49:05,592 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 21:49:05,593 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 21:49:05,595 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 21:49:05,596 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 21:49:05,597 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 21:49:05,600 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 21:49:05,601 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 21:49:05,601 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 21:49:05,602 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 21:49:05,603 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 21:49:05,604 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 21:49:05,604 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-20 21:49:05,610 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 21:49:05,612 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 21:49:05,612 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 21:49:05,629 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 21:49:05,630 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 21:49:05,631 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 21:49:05,632 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 21:49:05,632 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 21:49:05,632 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 21:49:05,632 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 21:49:05,633 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 21:49:05,633 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 21:49:05,633 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 21:49:05,633 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 21:49:05,633 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 21:49:05,634 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 21:49:05,634 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 21:49:05,634 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 21:49:05,634 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 21:49:05,634 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 21:49:05,635 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 21:49:05,635 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 21:49:05,635 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 21:49:05,635 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 21:49:05,636 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 21:49:05,636 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 21:49:05,636 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 21:49:05,636 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 21:49:05,637 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 21:49:05,637 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:05,637 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 21:49:05,637 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 21:49:05,637 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-20 21:49:05,979 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 21:49:06,000 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 21:49:06,004 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 21:49:06,006 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 21:49:06,007 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 21:49:06,007 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_10.c
[2020-07-20 21:49:06,099 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b2c173b3/2edd79914a154e9d8b60368c5ed43005/FLAG713d5ed77
[2020-07-20 21:49:06,666 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 21:49:06,667 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_10.c
[2020-07-20 21:49:06,676 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b2c173b3/2edd79914a154e9d8b60368c5ed43005/FLAG713d5ed77
[2020-07-20 21:49:07,007 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b2c173b3/2edd79914a154e9d8b60368c5ed43005
[2020-07-20 21:49:07,019 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 21:49:07,022 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 21:49:07,024 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 21:49:07,024 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 21:49:07,029 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 21:49:07,030 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,033 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58ebf14e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07, skipping insertion in model container
[2020-07-20 21:49:07,033 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,042 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 21:49:07,066 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 21:49:07,257 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 21:49:07,263 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 21:49:07,287 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 21:49:07,303 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 21:49:07,304 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07 WrapperNode
[2020-07-20 21:49:07,304 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 21:49:07,305 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 21:49:07,305 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 21:49:07,305 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 21:49:07,412 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,413 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,422 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,422 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,441 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,449 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,451 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (1/1) ...
[2020-07-20 21:49:07,454 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 21:49:07,454 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 21:49:07,454 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 21:49:07,455 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 21:49:07,456 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (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 21:49:07,525 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 21:49:07,525 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 21:49:07,525 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 21:49:07,525 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 21:49:07,525 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-20 21:49:07,526 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 21:49:07,526 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 21:49:07,526 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 21:49:07,896 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 21:49:07,897 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-07-20 21:49:07,902 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:07 BoogieIcfgContainer
[2020-07-20 21:49:07,902 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 21:49:07,904 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 21:49:07,904 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 21:49:07,908 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 21:49:07,908 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:49:07" (1/3) ...
[2020-07-20 21:49:07,909 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27dbd2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:07, skipping insertion in model container
[2020-07-20 21:49:07,910 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:49:07" (2/3) ...
[2020-07-20 21:49:07,910 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27dbd2d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:49:07, skipping insertion in model container
[2020-07-20 21:49:07,910 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:49:07" (3/3) ...
[2020-07-20 21:49:07,912 INFO  L109   eAbstractionObserver]: Analyzing ICFG test_locks_10.c
[2020-07-20 21:49:07,925 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 21:49:07,934 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 21:49:07,953 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 21:49:07,982 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 21:49:07,983 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 21:49:07,983 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 21:49:07,983 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 21:49:07,983 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 21:49:07,984 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 21:49:07,984 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 21:49:07,984 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 21:49:08,026 INFO  L276                IsEmpty]: Start isEmpty. Operand 44 states.
[2020-07-20 21:49:08,039 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-20 21:49:08,039 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:08,041 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]
[2020-07-20 21:49:08,042 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:08,050 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:08,051 INFO  L82        PathProgramCache]: Analyzing trace with hash -917347053, now seen corresponding path program 1 times
[2020-07-20 21:49:08,061 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:08,062 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978989853]
[2020-07-20 21:49:08,062 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 21:49:08,217 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:08,218 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:08,222 INFO  L263         TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:08,230 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:08,287 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 21:49:08,287 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:08,289 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978989853]
[2020-07-20 21:49:08,290 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:08,290 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:08,292 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876765280]
[2020-07-20 21:49:08,298 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:08,298 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:08,313 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:08,315 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:08,317 INFO  L87              Difference]: Start difference. First operand 44 states. Second operand 3 states.
[2020-07-20 21:49:08,379 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:08,379 INFO  L93              Difference]: Finished difference Result 87 states and 150 transitions.
[2020-07-20 21:49:08,380 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:08,381 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 20
[2020-07-20 21:49:08,382 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:08,394 INFO  L225             Difference]: With dead ends: 87
[2020-07-20 21:49:08,394 INFO  L226             Difference]: Without dead ends: 72
[2020-07-20 21:49:08,399 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 21:49:08,417 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 72 states.
[2020-07-20 21:49:08,448 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50.
[2020-07-20 21:49:08,450 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 50 states.
[2020-07-20 21:49:08,456 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 89 transitions.
[2020-07-20 21:49:08,459 INFO  L78                 Accepts]: Start accepts. Automaton has 50 states and 89 transitions. Word has length 20
[2020-07-20 21:49:08,460 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:08,461 INFO  L479      AbstractCegarLoop]: Abstraction has 50 states and 89 transitions.
[2020-07-20 21:49:08,461 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:08,463 INFO  L276                IsEmpty]: Start isEmpty. Operand 50 states and 89 transitions.
[2020-07-20 21:49:08,464 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-20 21:49:08,464 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:08,464 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]
[2020-07-20 21:49:08,668 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:08,668 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:08,669 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:08,670 INFO  L82        PathProgramCache]: Analyzing trace with hash -1504153067, now seen corresponding path program 1 times
[2020-07-20 21:49:08,670 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:08,671 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545711581]
[2020-07-20 21:49:08,671 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 21:49:08,732 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:08,732 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:08,733 INFO  L263         TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:08,735 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:08,753 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 21:49:08,754 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:08,754 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545711581]
[2020-07-20 21:49:08,755 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:08,755 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:08,755 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754185453]
[2020-07-20 21:49:08,757 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:08,757 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:08,758 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:08,758 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:08,759 INFO  L87              Difference]: Start difference. First operand 50 states and 89 transitions. Second operand 3 states.
[2020-07-20 21:49:08,793 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:08,794 INFO  L93              Difference]: Finished difference Result 117 states and 212 transitions.
[2020-07-20 21:49:08,794 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:08,794 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 20
[2020-07-20 21:49:08,795 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:08,797 INFO  L225             Difference]: With dead ends: 117
[2020-07-20 21:49:08,797 INFO  L226             Difference]: Without dead ends: 72
[2020-07-20 21:49:08,799 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 21:49:08,799 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 72 states.
[2020-07-20 21:49:08,809 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70.
[2020-07-20 21:49:08,810 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 70 states.
[2020-07-20 21:49:08,812 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 125 transitions.
[2020-07-20 21:49:08,812 INFO  L78                 Accepts]: Start accepts. Automaton has 70 states and 125 transitions. Word has length 20
[2020-07-20 21:49:08,812 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:08,812 INFO  L479      AbstractCegarLoop]: Abstraction has 70 states and 125 transitions.
[2020-07-20 21:49:08,813 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:08,813 INFO  L276                IsEmpty]: Start isEmpty. Operand 70 states and 125 transitions.
[2020-07-20 21:49:08,814 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 21:49:08,814 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:08,814 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]
[2020-07-20 21:49:09,028 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:09,029 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:09,029 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:09,030 INFO  L82        PathProgramCache]: Analyzing trace with hash 1627225809, now seen corresponding path program 1 times
[2020-07-20 21:49:09,030 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,030 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167130552]
[2020-07-20 21:49:09,030 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 21:49:09,083 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:09,083 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:09,085 INFO  L263         TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:09,087 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:09,107 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 21:49:09,107 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:09,108 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167130552]
[2020-07-20 21:49:09,108 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:09,109 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:09,109 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786333832]
[2020-07-20 21:49:09,110 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:09,110 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,110 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:09,111 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:09,111 INFO  L87              Difference]: Start difference. First operand 70 states and 125 transitions. Second operand 3 states.
[2020-07-20 21:49:09,133 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:09,134 INFO  L93              Difference]: Finished difference Result 108 states and 189 transitions.
[2020-07-20 21:49:09,134 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:09,135 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 21:49:09,135 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:09,137 INFO  L225             Difference]: With dead ends: 108
[2020-07-20 21:49:09,137 INFO  L226             Difference]: Without dead ends: 75
[2020-07-20 21:49:09,138 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 21:49:09,139 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 75 states.
[2020-07-20 21:49:09,151 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73.
[2020-07-20 21:49:09,151 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 73 states.
[2020-07-20 21:49:09,154 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 127 transitions.
[2020-07-20 21:49:09,155 INFO  L78                 Accepts]: Start accepts. Automaton has 73 states and 127 transitions. Word has length 21
[2020-07-20 21:49:09,155 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:09,157 INFO  L479      AbstractCegarLoop]: Abstraction has 73 states and 127 transitions.
[2020-07-20 21:49:09,157 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:09,157 INFO  L276                IsEmpty]: Start isEmpty. Operand 73 states and 127 transitions.
[2020-07-20 21:49:09,158 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 21:49:09,158 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:09,159 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]
[2020-07-20 21:49:09,373 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:09,373 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:09,374 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:09,374 INFO  L82        PathProgramCache]: Analyzing trace with hash 616108559, now seen corresponding path program 1 times
[2020-07-20 21:49:09,375 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,375 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357083778]
[2020-07-20 21:49:09,376 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 21:49:09,428 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:09,428 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:09,429 INFO  L263         TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:09,432 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:09,450 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 21:49:09,450 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:09,451 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357083778]
[2020-07-20 21:49:09,451 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:09,451 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:09,452 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721038577]
[2020-07-20 21:49:09,453 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:09,453 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,453 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:09,454 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:09,454 INFO  L87              Difference]: Start difference. First operand 73 states and 127 transitions. Second operand 3 states.
[2020-07-20 21:49:09,485 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:09,486 INFO  L93              Difference]: Finished difference Result 136 states and 240 transitions.
[2020-07-20 21:49:09,487 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:09,487 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 21:49:09,488 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:09,489 INFO  L225             Difference]: With dead ends: 136
[2020-07-20 21:49:09,490 INFO  L226             Difference]: Without dead ends: 134
[2020-07-20 21:49:09,490 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 21:49:09,491 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 134 states.
[2020-07-20 21:49:09,502 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 96.
[2020-07-20 21:49:09,502 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 96 states.
[2020-07-20 21:49:09,504 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 168 transitions.
[2020-07-20 21:49:09,504 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states and 168 transitions. Word has length 21
[2020-07-20 21:49:09,506 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:09,507 INFO  L479      AbstractCegarLoop]: Abstraction has 96 states and 168 transitions.
[2020-07-20 21:49:09,507 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:09,507 INFO  L276                IsEmpty]: Start isEmpty. Operand 96 states and 168 transitions.
[2020-07-20 21:49:09,508 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 21:49:09,508 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:09,509 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]
[2020-07-20 21:49:09,710 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:09,710 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:09,711 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:09,711 INFO  L82        PathProgramCache]: Analyzing trace with hash 29302545, now seen corresponding path program 1 times
[2020-07-20 21:49:09,712 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,713 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224920429]
[2020-07-20 21:49:09,714 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 21:49:09,781 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:09,782 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:09,783 INFO  L263         TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:09,785 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:09,799 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 21:49:09,800 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:09,800 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224920429]
[2020-07-20 21:49:09,800 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:09,801 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:09,801 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580123057]
[2020-07-20 21:49:09,801 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:09,802 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:09,802 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:09,802 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:09,803 INFO  L87              Difference]: Start difference. First operand 96 states and 168 transitions. Second operand 3 states.
[2020-07-20 21:49:09,826 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:09,826 INFO  L93              Difference]: Finished difference Result 224 states and 398 transitions.
[2020-07-20 21:49:09,827 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:09,827 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 21:49:09,828 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:09,829 INFO  L225             Difference]: With dead ends: 224
[2020-07-20 21:49:09,829 INFO  L226             Difference]: Without dead ends: 136
[2020-07-20 21:49:09,831 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 21:49:09,831 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 136 states.
[2020-07-20 21:49:09,841 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134.
[2020-07-20 21:49:09,842 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 134 states.
[2020-07-20 21:49:09,844 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 234 transitions.
[2020-07-20 21:49:09,844 INFO  L78                 Accepts]: Start accepts. Automaton has 134 states and 234 transitions. Word has length 21
[2020-07-20 21:49:09,844 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:09,845 INFO  L479      AbstractCegarLoop]: Abstraction has 134 states and 234 transitions.
[2020-07-20 21:49:09,845 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:09,845 INFO  L276                IsEmpty]: Start isEmpty. Operand 134 states and 234 transitions.
[2020-07-20 21:49:09,846 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 21:49:09,846 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:09,846 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]
[2020-07-20 21:49:10,059 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:10,061 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:10,061 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:10,061 INFO  L82        PathProgramCache]: Analyzing trace with hash 1919709866, now seen corresponding path program 1 times
[2020-07-20 21:49:10,062 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,062 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278793090]
[2020-07-20 21:49:10,063 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 21:49:10,102 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:10,102 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:10,103 INFO  L263         TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:10,105 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:10,118 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 21:49:10,119 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:10,119 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278793090]
[2020-07-20 21:49:10,119 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:10,119 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:10,120 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061260072]
[2020-07-20 21:49:10,120 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:10,120 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,121 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:10,121 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:10,121 INFO  L87              Difference]: Start difference. First operand 134 states and 234 transitions. Second operand 3 states.
[2020-07-20 21:49:10,140 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:10,141 INFO  L93              Difference]: Finished difference Result 201 states and 349 transitions.
[2020-07-20 21:49:10,141 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:10,141 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 21:49:10,142 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:10,143 INFO  L225             Difference]: With dead ends: 201
[2020-07-20 21:49:10,143 INFO  L226             Difference]: Without dead ends: 138
[2020-07-20 21:49:10,144 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 21:49:10,144 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 138 states.
[2020-07-20 21:49:10,162 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136.
[2020-07-20 21:49:10,162 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 136 states.
[2020-07-20 21:49:10,166 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 234 transitions.
[2020-07-20 21:49:10,166 INFO  L78                 Accepts]: Start accepts. Automaton has 136 states and 234 transitions. Word has length 22
[2020-07-20 21:49:10,167 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:10,167 INFO  L479      AbstractCegarLoop]: Abstraction has 136 states and 234 transitions.
[2020-07-20 21:49:10,167 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:10,167 INFO  L276                IsEmpty]: Start isEmpty. Operand 136 states and 234 transitions.
[2020-07-20 21:49:10,168 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 21:49:10,171 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:10,172 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]
[2020-07-20 21:49:10,384 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:10,385 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:10,386 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:10,386 INFO  L82        PathProgramCache]: Analyzing trace with hash 908592616, now seen corresponding path program 1 times
[2020-07-20 21:49:10,386 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,387 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601227184]
[2020-07-20 21:49:10,387 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 21:49:10,428 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:10,428 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:10,429 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:10,431 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:10,447 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 21:49:10,448 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:10,448 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601227184]
[2020-07-20 21:49:10,449 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:10,449 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:10,449 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434556654]
[2020-07-20 21:49:10,449 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:10,450 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,450 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:10,450 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:10,450 INFO  L87              Difference]: Start difference. First operand 136 states and 234 transitions. Second operand 3 states.
[2020-07-20 21:49:10,475 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:10,475 INFO  L93              Difference]: Finished difference Result 252 states and 440 transitions.
[2020-07-20 21:49:10,476 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:10,477 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 21:49:10,477 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:10,479 INFO  L225             Difference]: With dead ends: 252
[2020-07-20 21:49:10,479 INFO  L226             Difference]: Without dead ends: 250
[2020-07-20 21:49:10,480 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 21:49:10,481 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 250 states.
[2020-07-20 21:49:10,492 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 184.
[2020-07-20 21:49:10,493 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 184 states.
[2020-07-20 21:49:10,495 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 314 transitions.
[2020-07-20 21:49:10,495 INFO  L78                 Accepts]: Start accepts. Automaton has 184 states and 314 transitions. Word has length 22
[2020-07-20 21:49:10,496 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:10,496 INFO  L479      AbstractCegarLoop]: Abstraction has 184 states and 314 transitions.
[2020-07-20 21:49:10,496 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:10,496 INFO  L276                IsEmpty]: Start isEmpty. Operand 184 states and 314 transitions.
[2020-07-20 21:49:10,498 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 21:49:10,498 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:10,498 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]
[2020-07-20 21:49:10,714 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:10,714 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:10,715 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:10,715 INFO  L82        PathProgramCache]: Analyzing trace with hash 321786602, now seen corresponding path program 1 times
[2020-07-20 21:49:10,715 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,716 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999376307]
[2020-07-20 21:49:10,716 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 21:49:10,771 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:10,771 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:10,772 INFO  L263         TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:10,774 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:10,782 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 21:49:10,783 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:10,783 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999376307]
[2020-07-20 21:49:10,783 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:10,784 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:10,784 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549428502]
[2020-07-20 21:49:10,784 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:10,785 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:10,785 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:10,785 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:10,785 INFO  L87              Difference]: Start difference. First operand 184 states and 314 transitions. Second operand 3 states.
[2020-07-20 21:49:10,815 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:10,816 INFO  L93              Difference]: Finished difference Result 432 states and 744 transitions.
[2020-07-20 21:49:10,816 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:10,817 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 21:49:10,817 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:10,820 INFO  L225             Difference]: With dead ends: 432
[2020-07-20 21:49:10,820 INFO  L226             Difference]: Without dead ends: 258
[2020-07-20 21:49:10,822 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 21:49:10,823 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 258 states.
[2020-07-20 21:49:10,842 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256.
[2020-07-20 21:49:10,842 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 256 states.
[2020-07-20 21:49:10,847 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 434 transitions.
[2020-07-20 21:49:10,848 INFO  L78                 Accepts]: Start accepts. Automaton has 256 states and 434 transitions. Word has length 22
[2020-07-20 21:49:10,848 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:10,848 INFO  L479      AbstractCegarLoop]: Abstraction has 256 states and 434 transitions.
[2020-07-20 21:49:10,848 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:10,848 INFO  L276                IsEmpty]: Start isEmpty. Operand 256 states and 434 transitions.
[2020-07-20 21:49:10,850 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 21:49:10,850 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:10,850 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]
[2020-07-20 21:49:11,063 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:11,064 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:11,065 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:11,065 INFO  L82        PathProgramCache]: Analyzing trace with hash -1898185914, now seen corresponding path program 1 times
[2020-07-20 21:49:11,065 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,065 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692897178]
[2020-07-20 21:49:11,066 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 21:49:11,103 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:11,103 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:11,104 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:11,106 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:11,128 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 21:49:11,128 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:11,128 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692897178]
[2020-07-20 21:49:11,129 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:11,129 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:11,129 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260676050]
[2020-07-20 21:49:11,130 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:11,130 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,130 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:11,131 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:11,131 INFO  L87              Difference]: Start difference. First operand 256 states and 434 transitions. Second operand 3 states.
[2020-07-20 21:49:11,151 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:11,151 INFO  L93              Difference]: Finished difference Result 472 states and 812 transitions.
[2020-07-20 21:49:11,152 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:11,152 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 21:49:11,152 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:11,155 INFO  L225             Difference]: With dead ends: 472
[2020-07-20 21:49:11,156 INFO  L226             Difference]: Without dead ends: 470
[2020-07-20 21:49:11,156 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 21:49:11,158 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 470 states.
[2020-07-20 21:49:11,170 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 356.
[2020-07-20 21:49:11,171 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 356 states.
[2020-07-20 21:49:11,173 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 594 transitions.
[2020-07-20 21:49:11,173 INFO  L78                 Accepts]: Start accepts. Automaton has 356 states and 594 transitions. Word has length 23
[2020-07-20 21:49:11,174 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:11,174 INFO  L479      AbstractCegarLoop]: Abstraction has 356 states and 594 transitions.
[2020-07-20 21:49:11,174 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:11,174 INFO  L276                IsEmpty]: Start isEmpty. Operand 356 states and 594 transitions.
[2020-07-20 21:49:11,176 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 21:49:11,176 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:11,177 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]
[2020-07-20 21:49:11,391 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:11,392 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:11,392 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:11,392 INFO  L82        PathProgramCache]: Analyzing trace with hash 1809975368, now seen corresponding path program 1 times
[2020-07-20 21:49:11,393 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,393 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295526320]
[2020-07-20 21:49:11,394 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 21:49:11,436 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:11,436 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:11,437 INFO  L263         TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:11,439 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:11,448 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 21:49:11,449 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:11,449 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295526320]
[2020-07-20 21:49:11,449 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:11,450 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:11,450 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913343601]
[2020-07-20 21:49:11,450 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:11,450 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,450 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:11,451 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:11,451 INFO  L87              Difference]: Start difference. First operand 356 states and 594 transitions. Second operand 3 states.
[2020-07-20 21:49:11,475 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:11,475 INFO  L93              Difference]: Finished difference Result 532 states and 884 transitions.
[2020-07-20 21:49:11,476 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:11,476 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 21:49:11,476 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:11,479 INFO  L225             Difference]: With dead ends: 532
[2020-07-20 21:49:11,479 INFO  L226             Difference]: Without dead ends: 362
[2020-07-20 21:49:11,481 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 21:49:11,481 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 362 states.
[2020-07-20 21:49:11,497 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 360.
[2020-07-20 21:49:11,498 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 360 states.
[2020-07-20 21:49:11,500 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 590 transitions.
[2020-07-20 21:49:11,500 INFO  L78                 Accepts]: Start accepts. Automaton has 360 states and 590 transitions. Word has length 23
[2020-07-20 21:49:11,500 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:11,500 INFO  L479      AbstractCegarLoop]: Abstraction has 360 states and 590 transitions.
[2020-07-20 21:49:11,500 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:11,500 INFO  L276                IsEmpty]: Start isEmpty. Operand 360 states and 590 transitions.
[2020-07-20 21:49:11,501 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 21:49:11,502 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:11,502 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]
[2020-07-20 21:49:11,716 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:11,717 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:11,717 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:11,718 INFO  L82        PathProgramCache]: Analyzing trace with hash 798858118, now seen corresponding path program 1 times
[2020-07-20 21:49:11,718 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,718 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369014846]
[2020-07-20 21:49:11,719 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 21:49:11,756 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:11,757 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:11,758 INFO  L263         TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:11,760 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:11,775 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 21:49:11,776 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:11,777 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369014846]
[2020-07-20 21:49:11,777 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:11,777 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:11,783 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084815572]
[2020-07-20 21:49:11,783 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:11,784 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:11,784 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:11,784 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:11,784 INFO  L87              Difference]: Start difference. First operand 360 states and 590 transitions. Second operand 3 states.
[2020-07-20 21:49:11,827 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:11,828 INFO  L93              Difference]: Finished difference Result 844 states and 1392 transitions.
[2020-07-20 21:49:11,828 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:11,829 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 21:49:11,829 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:11,834 INFO  L225             Difference]: With dead ends: 844
[2020-07-20 21:49:11,834 INFO  L226             Difference]: Without dead ends: 498
[2020-07-20 21:49:11,835 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 21:49:11,836 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 498 states.
[2020-07-20 21:49:11,858 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 496.
[2020-07-20 21:49:11,859 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 496 states.
[2020-07-20 21:49:11,861 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 806 transitions.
[2020-07-20 21:49:11,861 INFO  L78                 Accepts]: Start accepts. Automaton has 496 states and 806 transitions. Word has length 23
[2020-07-20 21:49:11,862 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:11,862 INFO  L479      AbstractCegarLoop]: Abstraction has 496 states and 806 transitions.
[2020-07-20 21:49:11,862 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:11,862 INFO  L276                IsEmpty]: Start isEmpty. Operand 496 states and 806 transitions.
[2020-07-20 21:49:11,866 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-07-20 21:49:11,866 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:11,866 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]
[2020-07-20 21:49:12,082 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:12,082 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:12,083 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:12,083 INFO  L82        PathProgramCache]: Analyzing trace with hash 6129535, now seen corresponding path program 1 times
[2020-07-20 21:49:12,084 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,084 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635905899]
[2020-07-20 21:49:12,085 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 21:49:12,127 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:12,128 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:12,129 INFO  L263         TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:12,131 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:12,146 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 21:49:12,147 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:12,147 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635905899]
[2020-07-20 21:49:12,148 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:12,148 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:12,148 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404646430]
[2020-07-20 21:49:12,151 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:12,151 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,152 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:12,152 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:12,152 INFO  L87              Difference]: Start difference. First operand 496 states and 806 transitions. Second operand 3 states.
[2020-07-20 21:49:12,203 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:12,203 INFO  L93              Difference]: Finished difference Result 900 states and 1488 transitions.
[2020-07-20 21:49:12,204 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:12,204 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 24
[2020-07-20 21:49:12,204 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:12,210 INFO  L225             Difference]: With dead ends: 900
[2020-07-20 21:49:12,211 INFO  L226             Difference]: Without dead ends: 898
[2020-07-20 21:49:12,212 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 21:49:12,213 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 898 states.
[2020-07-20 21:49:12,236 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 704.
[2020-07-20 21:49:12,237 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 704 states.
[2020-07-20 21:49:12,241 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 704 states to 704 states and 1118 transitions.
[2020-07-20 21:49:12,242 INFO  L78                 Accepts]: Start accepts. Automaton has 704 states and 1118 transitions. Word has length 24
[2020-07-20 21:49:12,242 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:12,243 INFO  L479      AbstractCegarLoop]: Abstraction has 704 states and 1118 transitions.
[2020-07-20 21:49:12,243 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:12,243 INFO  L276                IsEmpty]: Start isEmpty. Operand 704 states and 1118 transitions.
[2020-07-20 21:49:12,244 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-07-20 21:49:12,245 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:12,245 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]
[2020-07-20 21:49:12,458 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:12,458 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:12,458 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:12,458 INFO  L82        PathProgramCache]: Analyzing trace with hash -580676479, now seen corresponding path program 1 times
[2020-07-20 21:49:12,459 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,459 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517679954]
[2020-07-20 21:49:12,459 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 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 21:49:12,494 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:12,495 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:12,496 INFO  L263         TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:12,498 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:12,504 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 21:49:12,504 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:12,505 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517679954]
[2020-07-20 21:49:12,505 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:12,505 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:12,505 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036471723]
[2020-07-20 21:49:12,506 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:12,506 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,506 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:12,507 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:12,507 INFO  L87              Difference]: Start difference. First operand 704 states and 1118 transitions. Second operand 3 states.
[2020-07-20 21:49:12,545 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:12,545 INFO  L93              Difference]: Finished difference Result 1652 states and 2640 transitions.
[2020-07-20 21:49:12,546 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:12,546 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 24
[2020-07-20 21:49:12,546 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:12,551 INFO  L225             Difference]: With dead ends: 1652
[2020-07-20 21:49:12,551 INFO  L226             Difference]: Without dead ends: 962
[2020-07-20 21:49:12,553 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 21:49:12,555 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 962 states.
[2020-07-20 21:49:12,577 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 962 to 960.
[2020-07-20 21:49:12,578 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 960 states.
[2020-07-20 21:49:12,582 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 960 states to 960 states and 1510 transitions.
[2020-07-20 21:49:12,583 INFO  L78                 Accepts]: Start accepts. Automaton has 960 states and 1510 transitions. Word has length 24
[2020-07-20 21:49:12,583 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:12,583 INFO  L479      AbstractCegarLoop]: Abstraction has 960 states and 1510 transitions.
[2020-07-20 21:49:12,583 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:12,584 INFO  L276                IsEmpty]: Start isEmpty. Operand 960 states and 1510 transitions.
[2020-07-20 21:49:12,585 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-07-20 21:49:12,585 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:12,585 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]
[2020-07-20 21:49:12,800 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:12,800 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:12,801 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:12,801 INFO  L82        PathProgramCache]: Analyzing trace with hash 190230329, now seen corresponding path program 1 times
[2020-07-20 21:49:12,801 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,802 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207051358]
[2020-07-20 21:49:12,802 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 21:49:12,836 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:12,836 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:12,837 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:12,838 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:12,854 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 21:49:12,855 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:12,855 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207051358]
[2020-07-20 21:49:12,856 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:12,856 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:12,856 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941194722]
[2020-07-20 21:49:12,857 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:12,857 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:12,857 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:12,857 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:12,857 INFO  L87              Difference]: Start difference. First operand 960 states and 1510 transitions. Second operand 3 states.
[2020-07-20 21:49:12,895 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:12,896 INFO  L93              Difference]: Finished difference Result 1716 states and 2744 transitions.
[2020-07-20 21:49:12,896 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:12,897 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 25
[2020-07-20 21:49:12,897 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:12,908 INFO  L225             Difference]: With dead ends: 1716
[2020-07-20 21:49:12,908 INFO  L226             Difference]: Without dead ends: 1714
[2020-07-20 21:49:12,909 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 21:49:12,911 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1714 states.
[2020-07-20 21:49:12,951 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1714 to 1392.
[2020-07-20 21:49:12,952 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1392 states.
[2020-07-20 21:49:12,960 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1392 states to 1392 states and 2134 transitions.
[2020-07-20 21:49:12,960 INFO  L78                 Accepts]: Start accepts. Automaton has 1392 states and 2134 transitions. Word has length 25
[2020-07-20 21:49:12,960 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:12,961 INFO  L479      AbstractCegarLoop]: Abstraction has 1392 states and 2134 transitions.
[2020-07-20 21:49:12,961 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:12,961 INFO  L276                IsEmpty]: Start isEmpty. Operand 1392 states and 2134 transitions.
[2020-07-20 21:49:12,963 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-07-20 21:49:12,963 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:12,963 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]
[2020-07-20 21:49:13,177 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:13,178 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:13,179 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:13,179 INFO  L82        PathProgramCache]: Analyzing trace with hash -396575685, now seen corresponding path program 1 times
[2020-07-20 21:49:13,179 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:13,180 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311909297]
[2020-07-20 21:49:13,180 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 21:49:13,238 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:13,239 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:13,240 INFO  L263         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:13,242 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:13,250 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 21:49:13,250 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:13,251 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311909297]
[2020-07-20 21:49:13,251 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:13,252 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:13,252 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216011564]
[2020-07-20 21:49:13,253 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:13,253 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:13,253 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:13,254 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:13,254 INFO  L87              Difference]: Start difference. First operand 1392 states and 2134 transitions. Second operand 3 states.
[2020-07-20 21:49:13,313 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:13,314 INFO  L93              Difference]: Finished difference Result 3252 states and 5016 transitions.
[2020-07-20 21:49:13,314 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:13,314 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 25
[2020-07-20 21:49:13,315 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:13,327 INFO  L225             Difference]: With dead ends: 3252
[2020-07-20 21:49:13,327 INFO  L226             Difference]: Without dead ends: 1874
[2020-07-20 21:49:13,331 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 21:49:13,333 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1874 states.
[2020-07-20 21:49:13,395 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1874 to 1872.
[2020-07-20 21:49:13,396 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1872 states.
[2020-07-20 21:49:13,406 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1872 states to 1872 states and 2838 transitions.
[2020-07-20 21:49:13,406 INFO  L78                 Accepts]: Start accepts. Automaton has 1872 states and 2838 transitions. Word has length 25
[2020-07-20 21:49:13,407 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:13,407 INFO  L479      AbstractCegarLoop]: Abstraction has 1872 states and 2838 transitions.
[2020-07-20 21:49:13,407 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:13,407 INFO  L276                IsEmpty]: Start isEmpty. Operand 1872 states and 2838 transitions.
[2020-07-20 21:49:13,410 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-07-20 21:49:13,411 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:13,411 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]
[2020-07-20 21:49:13,625 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:13,626 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:13,626 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:13,627 INFO  L82        PathProgramCache]: Analyzing trace with hash 1602387988, now seen corresponding path program 1 times
[2020-07-20 21:49:13,627 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:13,627 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026328699]
[2020-07-20 21:49:13,627 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 21:49:13,673 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:13,674 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:13,674 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:13,676 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:13,682 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 21:49:13,682 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:13,682 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026328699]
[2020-07-20 21:49:13,683 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:13,683 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:13,683 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830465408]
[2020-07-20 21:49:13,683 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:13,684 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:13,684 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:13,684 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:13,684 INFO  L87              Difference]: Start difference. First operand 1872 states and 2838 transitions. Second operand 3 states.
[2020-07-20 21:49:13,740 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:13,741 INFO  L93              Difference]: Finished difference Result 3284 states and 5048 transitions.
[2020-07-20 21:49:13,741 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:13,741 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 26
[2020-07-20 21:49:13,742 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:13,758 INFO  L225             Difference]: With dead ends: 3284
[2020-07-20 21:49:13,758 INFO  L226             Difference]: Without dead ends: 3282
[2020-07-20 21:49:13,761 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 21:49:13,765 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3282 states.
[2020-07-20 21:49:13,878 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3282 to 2768.
[2020-07-20 21:49:13,878 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2768 states.
[2020-07-20 21:49:13,891 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2768 states to 2768 states and 4086 transitions.
[2020-07-20 21:49:13,892 INFO  L78                 Accepts]: Start accepts. Automaton has 2768 states and 4086 transitions. Word has length 26
[2020-07-20 21:49:13,892 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:13,892 INFO  L479      AbstractCegarLoop]: Abstraction has 2768 states and 4086 transitions.
[2020-07-20 21:49:13,892 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:13,893 INFO  L276                IsEmpty]: Start isEmpty. Operand 2768 states and 4086 transitions.
[2020-07-20 21:49:13,898 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-07-20 21:49:13,898 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:13,898 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]
[2020-07-20 21:49:14,111 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:14,112 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:14,112 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:14,112 INFO  L82        PathProgramCache]: Analyzing trace with hash 1015581974, now seen corresponding path program 1 times
[2020-07-20 21:49:14,113 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:14,113 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319546302]
[2020-07-20 21:49:14,113 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 21:49:14,145 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:14,146 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:14,147 INFO  L263         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:14,148 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:14,160 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 21:49:14,160 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:14,160 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319546302]
[2020-07-20 21:49:14,161 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:14,161 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:14,161 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952476764]
[2020-07-20 21:49:14,162 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:14,162 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:14,162 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:14,164 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:14,165 INFO  L87              Difference]: Start difference. First operand 2768 states and 4086 transitions. Second operand 3 states.
[2020-07-20 21:49:14,258 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:14,258 INFO  L93              Difference]: Finished difference Result 6420 states and 9528 transitions.
[2020-07-20 21:49:14,259 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:14,259 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 26
[2020-07-20 21:49:14,259 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:14,280 INFO  L225             Difference]: With dead ends: 6420
[2020-07-20 21:49:14,280 INFO  L226             Difference]: Without dead ends: 3666
[2020-07-20 21:49:14,289 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 21:49:14,294 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3666 states.
[2020-07-20 21:49:14,389 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3666 to 3664.
[2020-07-20 21:49:14,389 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3664 states.
[2020-07-20 21:49:14,400 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3664 states to 3664 states and 5334 transitions.
[2020-07-20 21:49:14,401 INFO  L78                 Accepts]: Start accepts. Automaton has 3664 states and 5334 transitions. Word has length 26
[2020-07-20 21:49:14,401 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:14,401 INFO  L479      AbstractCegarLoop]: Abstraction has 3664 states and 5334 transitions.
[2020-07-20 21:49:14,401 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:14,401 INFO  L276                IsEmpty]: Start isEmpty. Operand 3664 states and 5334 transitions.
[2020-07-20 21:49:14,409 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 21:49:14,409 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:14,409 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]
[2020-07-20 21:49:14,622 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:14,623 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:14,624 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:14,624 INFO  L82        PathProgramCache]: Analyzing trace with hash -1865364498, now seen corresponding path program 1 times
[2020-07-20 21:49:14,624 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:14,625 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675547288]
[2020-07-20 21:49:14,625 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 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 21:49:14,660 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:14,660 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:14,661 INFO  L263         TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:14,662 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:14,674 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 21:49:14,675 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:14,675 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675547288]
[2020-07-20 21:49:14,675 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:14,676 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:14,676 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728511164]
[2020-07-20 21:49:14,676 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:14,676 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:14,677 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:14,677 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:14,677 INFO  L87              Difference]: Start difference. First operand 3664 states and 5334 transitions. Second operand 3 states.
[2020-07-20 21:49:14,735 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:14,735 INFO  L93              Difference]: Finished difference Result 5468 states and 7912 transitions.
[2020-07-20 21:49:14,735 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:14,736 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 27
[2020-07-20 21:49:14,736 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:14,754 INFO  L225             Difference]: With dead ends: 5468
[2020-07-20 21:49:14,754 INFO  L226             Difference]: Without dead ends: 3674
[2020-07-20 21:49:14,759 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 21:49:14,763 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3674 states.
[2020-07-20 21:49:14,890 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3674 to 3672.
[2020-07-20 21:49:14,891 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3672 states.
[2020-07-20 21:49:14,902 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3672 states to 3672 states and 5222 transitions.
[2020-07-20 21:49:14,903 INFO  L78                 Accepts]: Start accepts. Automaton has 3672 states and 5222 transitions. Word has length 27
[2020-07-20 21:49:14,903 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:14,903 INFO  L479      AbstractCegarLoop]: Abstraction has 3672 states and 5222 transitions.
[2020-07-20 21:49:14,903 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:14,904 INFO  L276                IsEmpty]: Start isEmpty. Operand 3672 states and 5222 transitions.
[2020-07-20 21:49:14,909 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 21:49:14,910 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:14,910 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]
[2020-07-20 21:49:15,123 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:15,124 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:15,124 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:15,125 INFO  L82        PathProgramCache]: Analyzing trace with hash 841254896, now seen corresponding path program 1 times
[2020-07-20 21:49:15,125 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:15,125 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909331179]
[2020-07-20 21:49:15,125 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 21:49:15,163 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:15,164 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:15,165 INFO  L263         TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:15,166 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:15,176 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 21:49:15,176 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:15,177 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909331179]
[2020-07-20 21:49:15,177 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:15,177 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:15,177 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172886992]
[2020-07-20 21:49:15,178 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:15,178 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:15,178 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:15,179 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:15,179 INFO  L87              Difference]: Start difference. First operand 3672 states and 5222 transitions. Second operand 3 states.
[2020-07-20 21:49:15,238 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:15,238 INFO  L93              Difference]: Finished difference Result 5484 states and 7752 transitions.
[2020-07-20 21:49:15,239 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:15,239 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 27
[2020-07-20 21:49:15,239 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:15,256 INFO  L225             Difference]: With dead ends: 5484
[2020-07-20 21:49:15,256 INFO  L226             Difference]: Without dead ends: 3690
[2020-07-20 21:49:15,262 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 21:49:15,267 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3690 states.
[2020-07-20 21:49:15,353 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3690 to 3688.
[2020-07-20 21:49:15,353 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3688 states.
[2020-07-20 21:49:15,364 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3688 states to 3688 states and 5126 transitions.
[2020-07-20 21:49:15,364 INFO  L78                 Accepts]: Start accepts. Automaton has 3688 states and 5126 transitions. Word has length 27
[2020-07-20 21:49:15,365 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:15,365 INFO  L479      AbstractCegarLoop]: Abstraction has 3688 states and 5126 transitions.
[2020-07-20 21:49:15,365 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:15,365 INFO  L276                IsEmpty]: Start isEmpty. Operand 3688 states and 5126 transitions.
[2020-07-20 21:49:15,370 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 21:49:15,371 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:15,371 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]
[2020-07-20 21:49:15,587 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:15,588 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:15,588 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:15,588 INFO  L82        PathProgramCache]: Analyzing trace with hash -179813458, now seen corresponding path program 1 times
[2020-07-20 21:49:15,589 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:15,589 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796641573]
[2020-07-20 21:49:15,589 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 21:49:15,626 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:15,627 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:15,628 INFO  L263         TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:15,629 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:15,641 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 21:49:15,641 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:15,641 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796641573]
[2020-07-20 21:49:15,642 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:15,642 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:15,642 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778592104]
[2020-07-20 21:49:15,642 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:15,643 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:15,643 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:15,643 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:15,643 INFO  L87              Difference]: Start difference. First operand 3688 states and 5126 transitions. Second operand 3 states.
[2020-07-20 21:49:15,701 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:15,701 INFO  L93              Difference]: Finished difference Result 5516 states and 7624 transitions.
[2020-07-20 21:49:15,702 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:15,702 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 27
[2020-07-20 21:49:15,702 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:15,736 INFO  L225             Difference]: With dead ends: 5516
[2020-07-20 21:49:15,737 INFO  L226             Difference]: Without dead ends: 3722
[2020-07-20 21:49:15,741 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 21:49:15,746 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3722 states.
[2020-07-20 21:49:15,836 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3720.
[2020-07-20 21:49:15,836 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3720 states.
[2020-07-20 21:49:15,849 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3720 states to 3720 states and 5062 transitions.
[2020-07-20 21:49:15,850 INFO  L78                 Accepts]: Start accepts. Automaton has 3720 states and 5062 transitions. Word has length 27
[2020-07-20 21:49:15,850 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:15,850 INFO  L479      AbstractCegarLoop]: Abstraction has 3720 states and 5062 transitions.
[2020-07-20 21:49:15,850 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:15,850 INFO  L276                IsEmpty]: Start isEmpty. Operand 3720 states and 5062 transitions.
[2020-07-20 21:49:15,858 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 21:49:15,858 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:15,859 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]
[2020-07-20 21:49:16,073 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:16,074 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:16,075 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:16,075 INFO  L82        PathProgramCache]: Analyzing trace with hash -1459677136, now seen corresponding path program 1 times
[2020-07-20 21:49:16,076 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:16,076 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1228637053]
[2020-07-20 21:49:16,076 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:16,128 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:16,129 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:16,130 INFO  L263         TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:16,132 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:16,141 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 21:49:16,141 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:16,141 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1228637053]
[2020-07-20 21:49:16,142 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:16,142 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:16,143 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173064717]
[2020-07-20 21:49:16,143 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:16,143 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:16,144 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:16,144 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:16,144 INFO  L87              Difference]: Start difference. First operand 3720 states and 5062 transitions. Second operand 3 states.
[2020-07-20 21:49:16,351 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:16,352 INFO  L93              Difference]: Finished difference Result 10892 states and 14664 transitions.
[2020-07-20 21:49:16,353 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:16,353 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 27
[2020-07-20 21:49:16,354 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:16,378 INFO  L225             Difference]: With dead ends: 10892
[2020-07-20 21:49:16,378 INFO  L226             Difference]: Without dead ends: 7242
[2020-07-20 21:49:16,389 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 21:49:16,402 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 7242 states.
[2020-07-20 21:49:16,593 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 7242 to 7240.
[2020-07-20 21:49:16,593 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7240 states.
[2020-07-20 21:49:16,618 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7240 states to 7240 states and 9478 transitions.
[2020-07-20 21:49:16,619 INFO  L78                 Accepts]: Start accepts. Automaton has 7240 states and 9478 transitions. Word has length 27
[2020-07-20 21:49:16,619 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:16,620 INFO  L479      AbstractCegarLoop]: Abstraction has 7240 states and 9478 transitions.
[2020-07-20 21:49:16,620 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:16,620 INFO  L276                IsEmpty]: Start isEmpty. Operand 7240 states and 9478 transitions.
[2020-07-20 21:49:16,633 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 21:49:16,633 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:16,633 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]
[2020-07-20 21:49:16,848 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:16,849 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:16,850 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:16,850 INFO  L82        PathProgramCache]: Analyzing trace with hash -872871122, now seen corresponding path program 1 times
[2020-07-20 21:49:16,850 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:16,851 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258081181]
[2020-07-20 21:49:16,851 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:16,892 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:16,893 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:16,893 INFO  L263         TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:16,895 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:16,900 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 21:49:16,901 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:16,901 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258081181]
[2020-07-20 21:49:16,901 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:16,902 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:16,902 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816424526]
[2020-07-20 21:49:16,902 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:16,902 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:16,903 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:16,903 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:16,903 INFO  L87              Difference]: Start difference. First operand 7240 states and 9478 transitions. Second operand 3 states.
[2020-07-20 21:49:17,018 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:17,019 INFO  L93              Difference]: Finished difference Result 8012 states and 10760 transitions.
[2020-07-20 21:49:17,019 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:17,020 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 27
[2020-07-20 21:49:17,020 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:17,040 INFO  L225             Difference]: With dead ends: 8012
[2020-07-20 21:49:17,040 INFO  L226             Difference]: Without dead ends: 8010
[2020-07-20 21:49:17,045 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 21:49:17,054 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 8010 states.
[2020-07-20 21:49:17,214 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 8010 to 7240.
[2020-07-20 21:49:17,214 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 7240 states.
[2020-07-20 21:49:17,315 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 7240 states to 7240 states and 9350 transitions.
[2020-07-20 21:49:17,316 INFO  L78                 Accepts]: Start accepts. Automaton has 7240 states and 9350 transitions. Word has length 27
[2020-07-20 21:49:17,316 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:17,316 INFO  L479      AbstractCegarLoop]: Abstraction has 7240 states and 9350 transitions.
[2020-07-20 21:49:17,316 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:17,317 INFO  L276                IsEmpty]: Start isEmpty. Operand 7240 states and 9350 transitions.
[2020-07-20 21:49:17,325 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2020-07-20 21:49:17,326 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:17,326 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]
[2020-07-20 21:49:17,539 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:17,540 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:17,541 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:17,541 INFO  L82        PathProgramCache]: Analyzing trace with hash 1994864807, now seen corresponding path program 1 times
[2020-07-20 21:49:17,541 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:17,542 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927061317]
[2020-07-20 21:49:17,542 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:17,591 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:17,591 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:17,593 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:17,594 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:17,602 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 21:49:17,602 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:17,602 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927061317]
[2020-07-20 21:49:17,603 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:17,603 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:17,603 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678905427]
[2020-07-20 21:49:17,604 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:17,604 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:17,604 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:17,605 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:17,605 INFO  L87              Difference]: Start difference. First operand 7240 states and 9350 transitions. Second operand 3 states.
[2020-07-20 21:49:17,805 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:17,806 INFO  L93              Difference]: Finished difference Result 12108 states and 15752 transitions.
[2020-07-20 21:49:17,806 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:17,806 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 28
[2020-07-20 21:49:17,807 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:17,845 INFO  L225             Difference]: With dead ends: 12108
[2020-07-20 21:49:17,845 INFO  L226             Difference]: Without dead ends: 12106
[2020-07-20 21:49:17,853 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 21:49:17,877 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 12106 states.
[2020-07-20 21:49:18,181 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 12106 to 11080.
[2020-07-20 21:49:18,181 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 11080 states.
[2020-07-20 21:49:18,221 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 11080 states to 11080 states and 13958 transitions.
[2020-07-20 21:49:18,221 INFO  L78                 Accepts]: Start accepts. Automaton has 11080 states and 13958 transitions. Word has length 28
[2020-07-20 21:49:18,221 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:18,222 INFO  L479      AbstractCegarLoop]: Abstraction has 11080 states and 13958 transitions.
[2020-07-20 21:49:18,222 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:18,222 INFO  L276                IsEmpty]: Start isEmpty. Operand 11080 states and 13958 transitions.
[2020-07-20 21:49:18,249 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2020-07-20 21:49:18,249 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:18,249 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]
[2020-07-20 21:49:18,463 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:18,464 INFO  L427      AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:18,465 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:18,465 INFO  L82        PathProgramCache]: Analyzing trace with hash 1408058793, now seen corresponding path program 1 times
[2020-07-20 21:49:18,465 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:18,466 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307641650]
[2020-07-20 21:49:18,466 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:18,524 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:49:18,524 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:18,525 INFO  L263         TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:18,527 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:18,536 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 21:49:18,536 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:18,537 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307641650]
[2020-07-20 21:49:18,537 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:18,537 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:18,538 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242433363]
[2020-07-20 21:49:18,538 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:18,538 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:18,540 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:18,540 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:18,540 INFO  L87              Difference]: Start difference. First operand 11080 states and 13958 transitions. Second operand 3 states.
[2020-07-20 21:49:18,951 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:18,951 INFO  L93              Difference]: Finished difference Result 25164 states and 31624 transitions.
[2020-07-20 21:49:18,951 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:18,952 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 28
[2020-07-20 21:49:18,952 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:18,988 INFO  L225             Difference]: With dead ends: 25164
[2020-07-20 21:49:18,989 INFO  L226             Difference]: Without dead ends: 14154
[2020-07-20 21:49:19,012 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 21:49:19,036 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14154 states.
[2020-07-20 21:49:19,334 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14154 to 14152.
[2020-07-20 21:49:19,335 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 14152 states.
[2020-07-20 21:49:19,375 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14152 states to 14152 states and 17286 transitions.
[2020-07-20 21:49:19,376 INFO  L78                 Accepts]: Start accepts. Automaton has 14152 states and 17286 transitions. Word has length 28
[2020-07-20 21:49:19,376 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:19,376 INFO  L479      AbstractCegarLoop]: Abstraction has 14152 states and 17286 transitions.
[2020-07-20 21:49:19,377 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:19,377 INFO  L276                IsEmpty]: Start isEmpty. Operand 14152 states and 17286 transitions.
[2020-07-20 21:49:19,397 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 30
[2020-07-20 21:49:19,398 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:19,398 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]
[2020-07-20 21:49:19,612 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:19,613 INFO  L427      AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:19,614 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:19,614 INFO  L82        PathProgramCache]: Analyzing trace with hash 1711482981, now seen corresponding path program 1 times
[2020-07-20 21:49:19,614 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:19,614 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038072151]
[2020-07-20 21:49:19,614 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:19,647 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s)
[2020-07-20 21:49:19,648 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:19,649 INFO  L263         TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:19,650 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:19,657 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 21:49:19,657 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:19,658 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038072151]
[2020-07-20 21:49:19,658 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:19,658 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:19,658 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119928973]
[2020-07-20 21:49:19,659 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:19,659 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:19,659 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:19,659 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:19,660 INFO  L87              Difference]: Start difference. First operand 14152 states and 17286 transitions. Second operand 3 states.
[2020-07-20 21:49:20,601 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:20,602 INFO  L93              Difference]: Finished difference Result 23114 states and 28039 transitions.
[2020-07-20 21:49:20,603 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:20,603 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 29
[2020-07-20 21:49:20,604 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:20,676 INFO  L225             Difference]: With dead ends: 23114
[2020-07-20 21:49:20,676 INFO  L226             Difference]: Without dead ends: 23112
[2020-07-20 21:49:20,691 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 21:49:20,730 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23112 states.
[2020-07-20 21:49:21,345 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23112 to 22088.
[2020-07-20 21:49:21,346 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22088 states.
[2020-07-20 21:49:21,428 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22088 states to 22088 states and 26502 transitions.
[2020-07-20 21:49:21,428 INFO  L78                 Accepts]: Start accepts. Automaton has 22088 states and 26502 transitions. Word has length 29
[2020-07-20 21:49:21,428 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:21,429 INFO  L479      AbstractCegarLoop]: Abstraction has 22088 states and 26502 transitions.
[2020-07-20 21:49:21,429 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:21,429 INFO  L276                IsEmpty]: Start isEmpty. Operand 22088 states and 26502 transitions.
[2020-07-20 21:49:21,491 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 30
[2020-07-20 21:49:21,492 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:49:21,492 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]
[2020-07-20 21:49:21,706 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:21,707 INFO  L427      AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:49:21,708 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:49:21,708 INFO  L82        PathProgramCache]: Analyzing trace with hash 1124676967, now seen corresponding path program 1 times
[2020-07-20 21:49:21,708 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:49:21,709 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896623362]
[2020-07-20 21:49:21,709 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:21,756 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:49:21,757 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:49:21,758 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 21:49:21,762 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:49:21,770 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 21:49:21,770 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:49:21,770 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896623362]
[2020-07-20 21:49:21,771 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:49:21,771 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 21:49:21,771 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963880421]
[2020-07-20 21:49:21,771 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 21:49:21,772 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:49:21,772 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 21:49:21,772 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 21:49:21,772 INFO  L87              Difference]: Start difference. First operand 22088 states and 26502 transitions. Second operand 3 states.
[2020-07-20 21:49:22,331 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:49:22,332 INFO  L93              Difference]: Finished difference Result 49736 states and 59270 transitions.
[2020-07-20 21:49:22,332 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 21:49:22,333 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 29
[2020-07-20 21:49:22,333 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:49:22,333 INFO  L225             Difference]: With dead ends: 49736
[2020-07-20 21:49:22,333 INFO  L226             Difference]: Without dead ends: 0
[2020-07-20 21:49:22,413 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 21:49:22,413 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 0 states.
[2020-07-20 21:49:22,414 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0.
[2020-07-20 21:49:22,414 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 0 states.
[2020-07-20 21:49:22,414 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions.
[2020-07-20 21:49:22,414 INFO  L78                 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29
[2020-07-20 21:49:22,414 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:49:22,415 INFO  L479      AbstractCegarLoop]: Abstraction has 0 states and 0 transitions.
[2020-07-20 21:49:22,415 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 21:49:22,415 INFO  L276                IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions.
[2020-07-20 21:49:22,415 INFO  L282                IsEmpty]: Finished isEmpty. No accepting run.
[2020-07-20 21:49:22,628 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:49:22,633 INFO  L343    DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.
[2020-07-20 21:49:22,747 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.initFINAL(line -1)  the Hoare annotation is:  true
[2020-07-20 21:49:22,747 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.initEXIT(line -1)  no Hoare annotation was computed.
[2020-07-20 21:49:22,747 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startEXIT(line -1)  no Hoare annotation was computed.
[2020-07-20 21:49:22,748 INFO  L271        CegarLoopResult]: At program point  L-1(line -1)  the Hoare annotation is:  true
[2020-07-20 21:49:22,749 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.startENTRY(line -1)  the Hoare annotation is:  true
[2020-07-20 21:49:22,749 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startFINAL(line -1)  no Hoare annotation was computed.
[2020-07-20 21:49:22,749 INFO  L271        CegarLoopResult]: At program point  L159(lines 5 163)  the Hoare annotation is:  true
[2020-07-20 21:49:22,749 INFO  L268        CegarLoopResult]: For program point  mainEXIT(lines 4 163)  no Hoare annotation was computed.
[2020-07-20 21:49:22,750 INFO  L268        CegarLoopResult]: For program point  L118-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,750 INFO  L268        CegarLoopResult]: For program point  L143-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,750 INFO  L268        CegarLoopResult]: For program point  L102-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,752 INFO  L268        CegarLoopResult]: For program point  L94-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,752 INFO  L268        CegarLoopResult]: For program point  L119(line 119)  no Hoare annotation was computed.
[2020-07-20 21:49:22,752 INFO  L268        CegarLoopResult]: For program point  L86-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,752 INFO  L268        CegarLoopResult]: For program point  L144(line 144)  no Hoare annotation was computed.
[2020-07-20 21:49:22,752 INFO  L268        CegarLoopResult]: For program point  L78-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,753 INFO  L268        CegarLoopResult]: For program point  L70-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,753 INFO  L268        CegarLoopResult]: For program point  L128-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,753 INFO  L271        CegarLoopResult]: At program point  L153-1(lines 39 158)  the Hoare annotation is:  true
[2020-07-20 21:49:22,753 INFO  L268        CegarLoopResult]: For program point  mainFINAL(lines 4 163)  no Hoare annotation was computed.
[2020-07-20 21:49:22,753 INFO  L268        CegarLoopResult]: For program point  L129(line 129)  no Hoare annotation was computed.
[2020-07-20 21:49:22,754 INFO  L268        CegarLoopResult]: For program point  mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 161)  no Hoare annotation was computed.
[2020-07-20 21:49:22,754 INFO  L271        CegarLoopResult]: At program point  mainENTRY(lines 4 163)  the Hoare annotation is:  true
[2020-07-20 21:49:22,754 INFO  L268        CegarLoopResult]: For program point  L154(line 154)  no Hoare annotation was computed.
[2020-07-20 21:49:22,754 INFO  L264        CegarLoopResult]: At program point  L154-1(lines 5 163)  the Hoare annotation is:  false
[2020-07-20 21:49:22,755 INFO  L268        CegarLoopResult]: For program point  L113-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,755 INFO  L268        CegarLoopResult]: For program point  L138-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,755 INFO  L268        CegarLoopResult]: For program point  L114(line 114)  no Hoare annotation was computed.
[2020-07-20 21:49:22,755 INFO  L268        CegarLoopResult]: For program point  L139(line 139)  no Hoare annotation was computed.
[2020-07-20 21:49:22,755 INFO  L268        CegarLoopResult]: For program point  L98-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L123-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L90-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L148-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L82-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L41(lines 41 43)  no Hoare annotation was computed.
[2020-07-20 21:49:22,756 INFO  L268        CegarLoopResult]: For program point  L74-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,757 INFO  L268        CegarLoopResult]: For program point  L66(lines 66 68)  no Hoare annotation was computed.
[2020-07-20 21:49:22,757 INFO  L268        CegarLoopResult]: For program point  L66-2(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,757 INFO  L268        CegarLoopResult]: For program point  L124(line 124)  no Hoare annotation was computed.
[2020-07-20 21:49:22,757 INFO  L268        CegarLoopResult]: For program point  L149(line 149)  no Hoare annotation was computed.
[2020-07-20 21:49:22,757 INFO  L268        CegarLoopResult]: For program point  L108-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,758 INFO  L268        CegarLoopResult]: For program point  L133-1(lines 39 158)  no Hoare annotation was computed.
[2020-07-20 21:49:22,758 INFO  L268        CegarLoopResult]: For program point  L109(line 109)  no Hoare annotation was computed.
[2020-07-20 21:49:22,758 INFO  L268        CegarLoopResult]: For program point  L134(line 134)  no Hoare annotation was computed.
[2020-07-20 21:49:22,779 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:49:22 BoogieIcfgContainer
[2020-07-20 21:49:22,779 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-20 21:49:22,783 INFO  L168              Benchmark]: Toolchain (without parser) took 15760.91 ms. Allocated memory was 142.1 MB in the beginning and 507.0 MB in the end (delta: 364.9 MB). Free memory was 99.2 MB in the beginning and 248.2 MB in the end (delta: -149.1 MB). Peak memory consumption was 215.8 MB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,784 INFO  L168              Benchmark]: CDTParser took 0.58 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,785 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 280.50 ms. Allocated memory is still 142.1 MB. Free memory was 98.7 MB in the beginning and 88.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,786 INFO  L168              Benchmark]: Boogie Preprocessor took 149.17 ms. Allocated memory was 142.1 MB in the beginning and 198.7 MB in the end (delta: 56.6 MB). Free memory was 88.0 MB in the beginning and 176.6 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,787 INFO  L168              Benchmark]: RCFGBuilder took 448.21 ms. Allocated memory is still 198.7 MB. Free memory was 176.6 MB in the beginning and 157.0 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,795 INFO  L168              Benchmark]: TraceAbstraction took 14875.63 ms. Allocated memory was 198.7 MB in the beginning and 507.0 MB in the end (delta: 308.3 MB). Free memory was 157.0 MB in the beginning and 248.2 MB in the end (delta: -91.3 MB). Peak memory consumption was 217.0 MB. Max. memory is 7.1 GB.
[2020-07-20 21:49:22,800 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.58 ms. Allocated memory is still 142.1 MB. Free memory was 118.3 MB in the beginning and 118.1 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 280.50 ms. Allocated memory is still 142.1 MB. Free memory was 98.7 MB in the beginning and 88.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 149.17 ms. Allocated memory was 142.1 MB in the beginning and 198.7 MB in the end (delta: 56.6 MB). Free memory was 88.0 MB in the beginning and 176.6 MB in the end (delta: -88.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 448.21 ms. Allocated memory is still 198.7 MB. Free memory was 176.6 MB in the beginning and 157.0 MB in the end (delta: 19.6 MB). Peak memory consumption was 19.6 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 14875.63 ms. Allocated memory was 198.7 MB in the beginning and 507.0 MB in the end (delta: 308.3 MB). Free memory was 157.0 MB in the beginning and 248.2 MB in the end (delta: -91.3 MB). Peak memory consumption was 217.0 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - PositiveResult [Line: 161]: call of __VERIFIER_error() unreachable
    For all program executions holds that call of __VERIFIER_error() unreachable at this location
  - AllSpecificationsHoldResult: All specifications hold
    1 specifications checked. All of them hold
  - InvariantResult [Line: 39]: Loop Invariant
    Derived loop invariant: 1
  - InvariantResult [Line: 5]: Loop Invariant
    Derived loop invariant: 0
  - InvariantResult [Line: 5]: Loop Invariant
    Derived loop invariant: 1
  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 3 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 14.6s, OverallIterations: 26, TraceHistogramMax: 1, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2204 SDtfs, 1061 SDslu, 1510 SDs, 0 SdLazy, 139 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 611 GetRequests, 585 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22088occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 2.9s AutomataMinimizationTime, 26 MinimizatonAttempts, 4120 StatesRemovedByMinimization, 25 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 1034 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 637 NumberOfCodeBlocks, 423 NumberOfCodeBlocksAsserted, 66 NumberOfCheckSat, 611 ConstructedInterpolants, 0 QuantifiedInterpolants, 28663 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2527 ConjunctsInSsa, 78 ConjunctsInUnsatCore, 26 InterpolantComputations, 26 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be correct!
Received shutdown request...