/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_8.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 17:12:28,171 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 17:12:28,174 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 17:12:28,197 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 17:12:28,197 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 17:12:28,201 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 17:12:28,203 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-20 17:12:28,214 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
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[2020-07-20 17:12:28,222 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
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[2020-07-20 17:12:28,228 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 17:12:28,229 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 17:12:28,229 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 17:12:28,230 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 17:12:28,234 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 17:12:28,236 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 17:12:28,243 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 17:12:28,248 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 17:12:28,250 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 17:12:28,253 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 17:12:28,259 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 17:12:28,259 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 17:12:28,260 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 17:12:28,263 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 17:12:28,264 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 17:12:28,268 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 17:12:28,269 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-20 17:12:28,276 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-07-20 17:12:28,278 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 17:12:28,281 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 17:12:28,283 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 17:12:28,305 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 17:12:28,305 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 17:12:28,307 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 17:12:28,308 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 17:12:28,308 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 17:12:28,308 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 17:12:28,309 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 17:12:28,309 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 17:12:28,309 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 17:12:28,309 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 17:12:28,309 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 17:12:28,310 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 17:12:28,310 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 17:12:28,310 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 17:12:28,310 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 17:12:28,311 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 17:12:28,311 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 17:12:28,311 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 17:12:28,311 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 17:12:28,312 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 17:12:28,312 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 17:12:28,312 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 17:12:28,312 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 17:12:28,312 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 17:12:28,313 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 17:12:28,313 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 17:12:28,313 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:28,313 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 17:12:28,314 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 17:12:28,314 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-20 17:12:28,679 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 17:12:28,697 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 17:12:28,702 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 17:12:28,705 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 17:12:28,705 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 17:12:28,706 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_8.c
[2020-07-20 17:12:28,798 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841/FLAGfb1a4c4c1
[2020-07-20 17:12:29,440 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 17:12:29,441 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_8.c
[2020-07-20 17:12:29,452 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841/FLAGfb1a4c4c1
[2020-07-20 17:12:29,737 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ac3b2fe7/266ef5ff95d34d21833dbf6dda711841
[2020-07-20 17:12:29,747 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 17:12:29,751 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 17:12:29,753 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 17:12:29,753 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 17:12:29,766 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 17:12:29,768 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:29" (1/1) ...
[2020-07-20 17:12:29,773 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55fc409a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:29, skipping insertion in model container
[2020-07-20 17:12:29,774 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:12:29" (1/1) ...
[2020-07-20 17:12:29,786 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 17:12:29,815 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 17:12:30,079 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 17:12:30,086 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 17:12:30,112 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 17:12:30,129 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 17:12:30,130 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30 WrapperNode
[2020-07-20 17:12:30,130 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 17:12:30,132 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 17:12:30,132 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 17:12:30,132 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 17:12:30,254 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,255 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,266 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,266 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,273 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,283 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,286 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (1/1) ...
[2020-07-20 17:12:30,289 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 17:12:30,290 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 17:12:30,290 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 17:12:30,290 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 17:12:30,292 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (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 17:12:30,371 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 17:12:30,372 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 17:12:30,372 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 17:12:30,372 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 17:12:30,372 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-20 17:12:30,372 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 17:12:30,372 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 17:12:30,373 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 17:12:30,727 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 17:12:30,729 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-07-20 17:12:30,738 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:30 BoogieIcfgContainer
[2020-07-20 17:12:30,739 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 17:12:30,742 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 17:12:30,742 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 17:12:30,750 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 17:12:30,751 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:12:29" (1/3) ...
[2020-07-20 17:12:30,753 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dfd62af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:30, skipping insertion in model container
[2020-07-20 17:12:30,754 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:12:30" (2/3) ...
[2020-07-20 17:12:30,754 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dfd62af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:12:30, skipping insertion in model container
[2020-07-20 17:12:30,755 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:12:30" (3/3) ...
[2020-07-20 17:12:30,757 INFO  L109   eAbstractionObserver]: Analyzing ICFG test_locks_8.c
[2020-07-20 17:12:30,779 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 17:12:30,789 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 17:12:30,815 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 17:12:30,851 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 17:12:30,852 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 17:12:30,852 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 17:12:30,852 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 17:12:30,852 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 17:12:30,852 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 17:12:30,853 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 17:12:30,853 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 17:12:30,885 INFO  L276                IsEmpty]: Start isEmpty. Operand 38 states.
[2020-07-20 17:12:30,894 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-07-20 17:12:30,895 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:30,897 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 17:12:30,897 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:30,909 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:30,910 INFO  L82        PathProgramCache]: Analyzing trace with hash 577441593, now seen corresponding path program 1 times
[2020-07-20 17:12:30,920 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:30,920 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713044318]
[2020-07-20 17:12:30,921 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 17:12:31,034 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:31,035 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:31,039 INFO  L263         TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:31,047 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:31,095 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 17:12:31,096 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:31,097 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713044318]
[2020-07-20 17:12:31,098 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:31,099 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:31,101 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295482565]
[2020-07-20 17:12:31,110 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:31,110 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:31,130 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:31,131 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:31,134 INFO  L87              Difference]: Start difference. First operand 38 states. Second operand 3 states.
[2020-07-20 17:12:31,221 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:31,221 INFO  L93              Difference]: Finished difference Result 75 states and 126 transitions.
[2020-07-20 17:12:31,222 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:31,224 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 18
[2020-07-20 17:12:31,225 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:31,241 INFO  L225             Difference]: With dead ends: 75
[2020-07-20 17:12:31,241 INFO  L226             Difference]: Without dead ends: 60
[2020-07-20 17:12:31,245 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 17:12:31,273 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 60 states.
[2020-07-20 17:12:31,307 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42.
[2020-07-20 17:12:31,310 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 42 states.
[2020-07-20 17:12:31,312 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 73 transitions.
[2020-07-20 17:12:31,315 INFO  L78                 Accepts]: Start accepts. Automaton has 42 states and 73 transitions. Word has length 18
[2020-07-20 17:12:31,316 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:31,317 INFO  L479      AbstractCegarLoop]: Abstraction has 42 states and 73 transitions.
[2020-07-20 17:12:31,317 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:31,317 INFO  L276                IsEmpty]: Start isEmpty. Operand 42 states and 73 transitions.
[2020-07-20 17:12:31,318 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-07-20 17:12:31,319 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:31,319 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 17:12:31,533 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:31,534 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:31,535 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:31,535 INFO  L82        PathProgramCache]: Analyzing trace with hash 1278506171, now seen corresponding path program 1 times
[2020-07-20 17:12:31,536 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:31,536 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194037239]
[2020-07-20 17:12:31,537 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 17:12:31,602 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:31,603 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:31,605 INFO  L263         TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:31,607 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:31,626 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 17:12:31,632 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:31,632 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194037239]
[2020-07-20 17:12:31,632 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:31,633 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:31,633 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404057044]
[2020-07-20 17:12:31,636 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:31,636 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:31,637 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:31,637 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:31,638 INFO  L87              Difference]: Start difference. First operand 42 states and 73 transitions. Second operand 3 states.
[2020-07-20 17:12:31,672 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:31,672 INFO  L93              Difference]: Finished difference Result 97 states and 172 transitions.
[2020-07-20 17:12:31,673 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:31,674 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 18
[2020-07-20 17:12:31,674 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:31,676 INFO  L225             Difference]: With dead ends: 97
[2020-07-20 17:12:31,676 INFO  L226             Difference]: Without dead ends: 60
[2020-07-20 17:12:31,678 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 17:12:31,679 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 60 states.
[2020-07-20 17:12:31,688 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58.
[2020-07-20 17:12:31,688 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 58 states.
[2020-07-20 17:12:31,690 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 101 transitions.
[2020-07-20 17:12:31,691 INFO  L78                 Accepts]: Start accepts. Automaton has 58 states and 101 transitions. Word has length 18
[2020-07-20 17:12:31,692 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:31,692 INFO  L479      AbstractCegarLoop]: Abstraction has 58 states and 101 transitions.
[2020-07-20 17:12:31,692 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:31,692 INFO  L276                IsEmpty]: Start isEmpty. Operand 58 states and 101 transitions.
[2020-07-20 17:12:31,693 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-07-20 17:12:31,694 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:31,694 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 17:12:31,909 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:31,911 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:31,911 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:31,912 INFO  L82        PathProgramCache]: Analyzing trace with hash 721034227, now seen corresponding path program 1 times
[2020-07-20 17:12:31,913 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:31,913 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646701512]
[2020-07-20 17:12:31,914 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 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 17:12:31,975 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:31,976 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:31,977 INFO  L263         TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:31,979 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:32,006 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 17:12:32,007 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:32,007 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646701512]
[2020-07-20 17:12:32,008 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:32,008 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:32,008 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830264060]
[2020-07-20 17:12:32,012 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:32,012 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:32,013 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:32,013 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:32,013 INFO  L87              Difference]: Start difference. First operand 58 states and 101 transitions. Second operand 3 states.
[2020-07-20 17:12:32,054 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:32,054 INFO  L93              Difference]: Finished difference Result 90 states and 153 transitions.
[2020-07-20 17:12:32,055 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:32,055 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 19
[2020-07-20 17:12:32,056 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:32,057 INFO  L225             Difference]: With dead ends: 90
[2020-07-20 17:12:32,058 INFO  L226             Difference]: Without dead ends: 63
[2020-07-20 17:12:32,059 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,060 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 63 states.
[2020-07-20 17:12:32,068 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61.
[2020-07-20 17:12:32,068 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 61 states.
[2020-07-20 17:12:32,071 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 103 transitions.
[2020-07-20 17:12:32,071 INFO  L78                 Accepts]: Start accepts. Automaton has 61 states and 103 transitions. Word has length 19
[2020-07-20 17:12:32,072 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:32,072 INFO  L479      AbstractCegarLoop]: Abstraction has 61 states and 103 transitions.
[2020-07-20 17:12:32,072 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:32,072 INFO  L276                IsEmpty]: Start isEmpty. Operand 61 states and 103 transitions.
[2020-07-20 17:12:32,073 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-07-20 17:12:32,073 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:32,073 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 17:12:32,289 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:32,290 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:32,290 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:32,291 INFO  L82        PathProgramCache]: Analyzing trace with hash 979199665, now seen corresponding path program 1 times
[2020-07-20 17:12:32,291 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:32,292 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94470658]
[2020-07-20 17:12:32,292 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 17:12:32,346 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:32,347 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:32,348 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:32,350 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:32,367 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 17:12:32,368 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:32,369 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94470658]
[2020-07-20 17:12:32,369 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:32,369 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:32,370 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991187700]
[2020-07-20 17:12:32,370 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:32,371 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:32,372 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:32,372 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:32,373 INFO  L87              Difference]: Start difference. First operand 61 states and 103 transitions. Second operand 3 states.
[2020-07-20 17:12:32,406 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:32,406 INFO  L93              Difference]: Finished difference Result 112 states and 192 transitions.
[2020-07-20 17:12:32,407 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:32,407 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 19
[2020-07-20 17:12:32,407 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:32,409 INFO  L225             Difference]: With dead ends: 112
[2020-07-20 17:12:32,410 INFO  L226             Difference]: Without dead ends: 110
[2020-07-20 17:12:32,411 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,412 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 110 states.
[2020-07-20 17:12:32,422 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80.
[2020-07-20 17:12:32,422 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 80 states.
[2020-07-20 17:12:32,425 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 136 transitions.
[2020-07-20 17:12:32,426 INFO  L78                 Accepts]: Start accepts. Automaton has 80 states and 136 transitions. Word has length 19
[2020-07-20 17:12:32,426 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:32,426 INFO  L479      AbstractCegarLoop]: Abstraction has 80 states and 136 transitions.
[2020-07-20 17:12:32,426 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:32,427 INFO  L276                IsEmpty]: Start isEmpty. Operand 80 states and 136 transitions.
[2020-07-20 17:12:32,428 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-07-20 17:12:32,428 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:32,428 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 17:12:32,641 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:32,642 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:32,643 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:32,643 INFO  L82        PathProgramCache]: Analyzing trace with hash 1680264243, now seen corresponding path program 1 times
[2020-07-20 17:12:32,644 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:32,644 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931018902]
[2020-07-20 17:12:32,644 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 17:12:32,696 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:32,696 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:32,698 INFO  L263         TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:32,700 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:32,718 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 17:12:32,719 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:32,719 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931018902]
[2020-07-20 17:12:32,720 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:32,720 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:32,720 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327833866]
[2020-07-20 17:12:32,721 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:32,722 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:32,722 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:32,723 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:32,723 INFO  L87              Difference]: Start difference. First operand 80 states and 136 transitions. Second operand 3 states.
[2020-07-20 17:12:32,757 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:32,757 INFO  L93              Difference]: Finished difference Result 184 states and 318 transitions.
[2020-07-20 17:12:32,758 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:32,777 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 19
[2020-07-20 17:12:32,778 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:32,781 INFO  L225             Difference]: With dead ends: 184
[2020-07-20 17:12:32,781 INFO  L226             Difference]: Without dead ends: 112
[2020-07-20 17:12:32,783 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 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 17:12:32,784 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 112 states.
[2020-07-20 17:12:32,796 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 110.
[2020-07-20 17:12:32,796 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 110 states.
[2020-07-20 17:12:32,799 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 186 transitions.
[2020-07-20 17:12:32,799 INFO  L78                 Accepts]: Start accepts. Automaton has 110 states and 186 transitions. Word has length 19
[2020-07-20 17:12:32,800 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:32,800 INFO  L479      AbstractCegarLoop]: Abstraction has 110 states and 186 transitions.
[2020-07-20 17:12:32,800 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:32,800 INFO  L276                IsEmpty]: Start isEmpty. Operand 110 states and 186 transitions.
[2020-07-20 17:12:32,801 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-20 17:12:32,802 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:32,802 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 17:12:33,018 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:33,019 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:33,019 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:33,020 INFO  L82        PathProgramCache]: Analyzing trace with hash 290632912, now seen corresponding path program 1 times
[2020-07-20 17:12:33,020 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,020 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453637881]
[2020-07-20 17:12:33,021 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 17:12:33,065 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:33,066 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:33,067 INFO  L263         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:33,068 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:33,082 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 17:12:33,082 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:33,083 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453637881]
[2020-07-20 17:12:33,083 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:33,085 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:33,086 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408438602]
[2020-07-20 17:12:33,086 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:33,087 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,088 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:33,088 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:33,089 INFO  L87              Difference]: Start difference. First operand 110 states and 186 transitions. Second operand 3 states.
[2020-07-20 17:12:33,116 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:33,117 INFO  L93              Difference]: Finished difference Result 165 states and 277 transitions.
[2020-07-20 17:12:33,117 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:33,117 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 20
[2020-07-20 17:12:33,118 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:33,120 INFO  L225             Difference]: With dead ends: 165
[2020-07-20 17:12:33,121 INFO  L226             Difference]: Without dead ends: 114
[2020-07-20 17:12:33,122 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 17:12:33,124 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 114 states.
[2020-07-20 17:12:33,141 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112.
[2020-07-20 17:12:33,141 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 112 states.
[2020-07-20 17:12:33,143 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 186 transitions.
[2020-07-20 17:12:33,144 INFO  L78                 Accepts]: Start accepts. Automaton has 112 states and 186 transitions. Word has length 20
[2020-07-20 17:12:33,144 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:33,144 INFO  L479      AbstractCegarLoop]: Abstraction has 112 states and 186 transitions.
[2020-07-20 17:12:33,144 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:33,144 INFO  L276                IsEmpty]: Start isEmpty. Operand 112 states and 186 transitions.
[2020-07-20 17:12:33,145 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-20 17:12:33,146 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:33,146 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 17:12:33,350 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:33,350 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:33,351 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:33,351 INFO  L82        PathProgramCache]: Analyzing trace with hash 548798350, now seen corresponding path program 1 times
[2020-07-20 17:12:33,352 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,352 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308727597]
[2020-07-20 17:12:33,353 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 17:12:33,396 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:33,396 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:33,397 INFO  L263         TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:33,399 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:33,409 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 17:12:33,410 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:33,414 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308727597]
[2020-07-20 17:12:33,415 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:33,415 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:33,416 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560330622]
[2020-07-20 17:12:33,416 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:33,417 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,417 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:33,417 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:33,417 INFO  L87              Difference]: Start difference. First operand 112 states and 186 transitions. Second operand 3 states.
[2020-07-20 17:12:33,439 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:33,440 INFO  L93              Difference]: Finished difference Result 204 states and 344 transitions.
[2020-07-20 17:12:33,440 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:33,441 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 20
[2020-07-20 17:12:33,441 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:33,443 INFO  L225             Difference]: With dead ends: 204
[2020-07-20 17:12:33,444 INFO  L226             Difference]: Without dead ends: 202
[2020-07-20 17:12:33,445 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 17:12:33,446 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 202 states.
[2020-07-20 17:12:33,458 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 152.
[2020-07-20 17:12:33,459 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 152 states.
[2020-07-20 17:12:33,461 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 250 transitions.
[2020-07-20 17:12:33,462 INFO  L78                 Accepts]: Start accepts. Automaton has 152 states and 250 transitions. Word has length 20
[2020-07-20 17:12:33,462 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:33,462 INFO  L479      AbstractCegarLoop]: Abstraction has 152 states and 250 transitions.
[2020-07-20 17:12:33,462 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:33,463 INFO  L276                IsEmpty]: Start isEmpty. Operand 152 states and 250 transitions.
[2020-07-20 17:12:33,464 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-20 17:12:33,464 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:33,465 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 17:12:33,678 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:33,680 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:33,680 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:33,680 INFO  L82        PathProgramCache]: Analyzing trace with hash 1249862928, now seen corresponding path program 1 times
[2020-07-20 17:12:33,681 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,681 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165781786]
[2020-07-20 17:12:33,682 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 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 17:12:33,728 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:33,729 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:33,730 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:33,735 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:33,747 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 17:12:33,747 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:33,748 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165781786]
[2020-07-20 17:12:33,749 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:33,749 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:33,749 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859881689]
[2020-07-20 17:12:33,750 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:33,750 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:33,750 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:33,751 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:33,751 INFO  L87              Difference]: Start difference. First operand 152 states and 250 transitions. Second operand 3 states.
[2020-07-20 17:12:33,781 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:33,781 INFO  L93              Difference]: Finished difference Result 352 states and 584 transitions.
[2020-07-20 17:12:33,782 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:33,782 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 20
[2020-07-20 17:12:33,783 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:33,785 INFO  L225             Difference]: With dead ends: 352
[2020-07-20 17:12:33,785 INFO  L226             Difference]: Without dead ends: 210
[2020-07-20 17:12:33,787 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 17:12:33,787 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 210 states.
[2020-07-20 17:12:33,801 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208.
[2020-07-20 17:12:33,802 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 208 states.
[2020-07-20 17:12:33,804 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 338 transitions.
[2020-07-20 17:12:33,805 INFO  L78                 Accepts]: Start accepts. Automaton has 208 states and 338 transitions. Word has length 20
[2020-07-20 17:12:33,806 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:33,806 INFO  L479      AbstractCegarLoop]: Abstraction has 208 states and 338 transitions.
[2020-07-20 17:12:33,806 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:33,806 INFO  L276                IsEmpty]: Start isEmpty. Operand 208 states and 338 transitions.
[2020-07-20 17:12:33,808 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 17:12:33,809 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:33,809 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 17:12:34,023 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:34,024 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:34,024 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:34,025 INFO  L82        PathProgramCache]: Analyzing trace with hash -166905624, now seen corresponding path program 1 times
[2020-07-20 17:12:34,026 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,026 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529814334]
[2020-07-20 17:12:34,027 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 17:12:34,068 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 17:12:34,068 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:34,070 INFO  L263         TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:34,071 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:34,088 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 17:12:34,089 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:34,089 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529814334]
[2020-07-20 17:12:34,089 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:34,090 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:34,090 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948296208]
[2020-07-20 17:12:34,090 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:34,090 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,091 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:34,091 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:34,091 INFO  L87              Difference]: Start difference. First operand 208 states and 338 transitions. Second operand 3 states.
[2020-07-20 17:12:34,111 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:34,111 INFO  L93              Difference]: Finished difference Result 312 states and 504 transitions.
[2020-07-20 17:12:34,112 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:34,112 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 17:12:34,112 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:34,114 INFO  L225             Difference]: With dead ends: 312
[2020-07-20 17:12:34,115 INFO  L226             Difference]: Without dead ends: 214
[2020-07-20 17:12:34,116 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 17:12:34,117 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 214 states.
[2020-07-20 17:12:34,130 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 212.
[2020-07-20 17:12:34,130 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 212 states.
[2020-07-20 17:12:34,132 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 338 transitions.
[2020-07-20 17:12:34,133 INFO  L78                 Accepts]: Start accepts. Automaton has 212 states and 338 transitions. Word has length 21
[2020-07-20 17:12:34,134 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:34,134 INFO  L479      AbstractCegarLoop]: Abstraction has 212 states and 338 transitions.
[2020-07-20 17:12:34,134 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:34,134 INFO  L276                IsEmpty]: Start isEmpty. Operand 212 states and 338 transitions.
[2020-07-20 17:12:34,136 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 17:12:34,136 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:34,136 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 17:12:34,347 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:34,348 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:34,348 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:34,349 INFO  L82        PathProgramCache]: Analyzing trace with hash 91259814, now seen corresponding path program 1 times
[2020-07-20 17:12:34,349 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,350 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006517993]
[2020-07-20 17:12:34,351 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 17:12:34,394 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:34,395 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:34,395 INFO  L263         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:34,397 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:34,415 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 17:12:34,417 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:34,417 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006517993]
[2020-07-20 17:12:34,418 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:34,418 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:34,418 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747586293]
[2020-07-20 17:12:34,419 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:34,419 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,420 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:34,421 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:34,422 INFO  L87              Difference]: Start difference. First operand 212 states and 338 transitions. Second operand 3 states.
[2020-07-20 17:12:34,478 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:34,482 INFO  L93              Difference]: Finished difference Result 380 states and 616 transitions.
[2020-07-20 17:12:34,484 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:34,485 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 17:12:34,485 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:34,489 INFO  L225             Difference]: With dead ends: 380
[2020-07-20 17:12:34,490 INFO  L226             Difference]: Without dead ends: 378
[2020-07-20 17:12:34,491 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 17:12:34,492 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 378 states.
[2020-07-20 17:12:34,512 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 296.
[2020-07-20 17:12:34,513 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 296 states.
[2020-07-20 17:12:34,520 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 462 transitions.
[2020-07-20 17:12:34,521 INFO  L78                 Accepts]: Start accepts. Automaton has 296 states and 462 transitions. Word has length 21
[2020-07-20 17:12:34,521 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:34,522 INFO  L479      AbstractCegarLoop]: Abstraction has 296 states and 462 transitions.
[2020-07-20 17:12:34,522 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:34,522 INFO  L276                IsEmpty]: Start isEmpty. Operand 296 states and 462 transitions.
[2020-07-20 17:12:34,540 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-07-20 17:12:34,541 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:34,541 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 17:12:34,755 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:34,755 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:34,755 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:34,755 INFO  L82        PathProgramCache]: Analyzing trace with hash 792324392, now seen corresponding path program 1 times
[2020-07-20 17:12:34,756 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,756 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474189960]
[2020-07-20 17:12:34,756 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 17:12:34,829 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:34,829 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:34,831 INFO  L263         TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:34,839 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:34,867 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 17:12:34,868 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:34,869 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474189960]
[2020-07-20 17:12:34,869 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:34,869 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:34,870 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565227940]
[2020-07-20 17:12:34,871 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:34,871 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:34,872 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:34,872 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:34,872 INFO  L87              Difference]: Start difference. First operand 296 states and 462 transitions. Second operand 3 states.
[2020-07-20 17:12:34,906 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:34,906 INFO  L93              Difference]: Finished difference Result 684 states and 1072 transitions.
[2020-07-20 17:12:34,907 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:34,908 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 21
[2020-07-20 17:12:34,908 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:34,911 INFO  L225             Difference]: With dead ends: 684
[2020-07-20 17:12:34,911 INFO  L226             Difference]: Without dead ends: 402
[2020-07-20 17:12:34,913 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 17:12:34,915 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 402 states.
[2020-07-20 17:12:34,930 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 400.
[2020-07-20 17:12:34,931 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 400 states.
[2020-07-20 17:12:34,933 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 614 transitions.
[2020-07-20 17:12:34,934 INFO  L78                 Accepts]: Start accepts. Automaton has 400 states and 614 transitions. Word has length 21
[2020-07-20 17:12:34,934 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:34,934 INFO  L479      AbstractCegarLoop]: Abstraction has 400 states and 614 transitions.
[2020-07-20 17:12:34,934 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:34,934 INFO  L276                IsEmpty]: Start isEmpty. Operand 400 states and 614 transitions.
[2020-07-20 17:12:34,936 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 17:12:34,937 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:34,937 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 17:12:35,150 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:35,151 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:35,152 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:35,152 INFO  L82        PathProgramCache]: Analyzing trace with hash -1465698011, now seen corresponding path program 1 times
[2020-07-20 17:12:35,152 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,152 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340772065]
[2020-07-20 17:12:35,153 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 17:12:35,193 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:35,194 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:35,196 INFO  L263         TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:35,199 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:35,212 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 17:12:35,213 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:35,213 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340772065]
[2020-07-20 17:12:35,213 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:35,214 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:35,214 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154918926]
[2020-07-20 17:12:35,215 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:35,215 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,216 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:35,216 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:35,217 INFO  L87              Difference]: Start difference. First operand 400 states and 614 transitions. Second operand 3 states.
[2020-07-20 17:12:35,244 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:35,244 INFO  L93              Difference]: Finished difference Result 600 states and 916 transitions.
[2020-07-20 17:12:35,245 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:35,245 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 17:12:35,246 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:35,249 INFO  L225             Difference]: With dead ends: 600
[2020-07-20 17:12:35,249 INFO  L226             Difference]: Without dead ends: 410
[2020-07-20 17:12:35,251 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 17:12:35,253 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 410 states.
[2020-07-20 17:12:35,270 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 408.
[2020-07-20 17:12:35,271 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 408 states.
[2020-07-20 17:12:35,274 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 614 transitions.
[2020-07-20 17:12:35,274 INFO  L78                 Accepts]: Start accepts. Automaton has 408 states and 614 transitions. Word has length 22
[2020-07-20 17:12:35,275 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:35,275 INFO  L479      AbstractCegarLoop]: Abstraction has 408 states and 614 transitions.
[2020-07-20 17:12:35,275 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:35,275 INFO  L276                IsEmpty]: Start isEmpty. Operand 408 states and 614 transitions.
[2020-07-20 17:12:35,277 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 17:12:35,278 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:35,278 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 17:12:35,494 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:35,494 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:35,495 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:35,495 INFO  L82        PathProgramCache]: Analyzing trace with hash -1207532573, now seen corresponding path program 1 times
[2020-07-20 17:12:35,496 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,497 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828668861]
[2020-07-20 17:12:35,497 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 17:12:35,538 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:35,539 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:35,540 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:35,541 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:35,552 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 17:12:35,553 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:35,553 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828668861]
[2020-07-20 17:12:35,554 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:35,554 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:35,555 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306052701]
[2020-07-20 17:12:35,557 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:35,558 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,559 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:35,559 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:35,559 INFO  L87              Difference]: Start difference. First operand 408 states and 614 transitions. Second operand 3 states.
[2020-07-20 17:12:35,593 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:35,593 INFO  L93              Difference]: Finished difference Result 716 states and 1096 transitions.
[2020-07-20 17:12:35,596 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:35,597 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 17:12:35,597 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:35,613 INFO  L225             Difference]: With dead ends: 716
[2020-07-20 17:12:35,613 INFO  L226             Difference]: Without dead ends: 714
[2020-07-20 17:12:35,614 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 17:12:35,616 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 714 states.
[2020-07-20 17:12:35,634 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 584.
[2020-07-20 17:12:35,634 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 584 states.
[2020-07-20 17:12:35,638 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 584 states to 584 states and 854 transitions.
[2020-07-20 17:12:35,639 INFO  L78                 Accepts]: Start accepts. Automaton has 584 states and 854 transitions. Word has length 22
[2020-07-20 17:12:35,639 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:35,639 INFO  L479      AbstractCegarLoop]: Abstraction has 584 states and 854 transitions.
[2020-07-20 17:12:35,639 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:35,639 INFO  L276                IsEmpty]: Start isEmpty. Operand 584 states and 854 transitions.
[2020-07-20 17:12:35,641 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2020-07-20 17:12:35,642 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:35,642 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 17:12:35,855 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:35,856 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:35,856 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:35,857 INFO  L82        PathProgramCache]: Analyzing trace with hash -506467995, now seen corresponding path program 1 times
[2020-07-20 17:12:35,857 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,858 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223283336]
[2020-07-20 17:12:35,858 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 17:12:35,892 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:35,893 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:35,894 INFO  L263         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:35,896 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:35,911 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 17:12:35,911 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:35,911 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223283336]
[2020-07-20 17:12:35,912 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:35,912 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:35,912 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084815572]
[2020-07-20 17:12:35,919 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:35,920 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:35,920 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:35,920 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:35,920 INFO  L87              Difference]: Start difference. First operand 584 states and 854 transitions. Second operand 3 states.
[2020-07-20 17:12:35,958 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:35,959 INFO  L93              Difference]: Finished difference Result 1340 states and 1960 transitions.
[2020-07-20 17:12:35,960 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:35,960 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 22
[2020-07-20 17:12:35,962 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:35,969 INFO  L225             Difference]: With dead ends: 1340
[2020-07-20 17:12:35,969 INFO  L226             Difference]: Without dead ends: 778
[2020-07-20 17:12:35,973 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 17:12:35,975 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 778 states.
[2020-07-20 17:12:35,999 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 776.
[2020-07-20 17:12:36,000 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 776 states.
[2020-07-20 17:12:36,004 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1110 transitions.
[2020-07-20 17:12:36,005 INFO  L78                 Accepts]: Start accepts. Automaton has 776 states and 1110 transitions. Word has length 22
[2020-07-20 17:12:36,006 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:36,006 INFO  L479      AbstractCegarLoop]: Abstraction has 776 states and 1110 transitions.
[2020-07-20 17:12:36,006 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:36,006 INFO  L276                IsEmpty]: Start isEmpty. Operand 776 states and 1110 transitions.
[2020-07-20 17:12:36,008 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 17:12:36,008 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:36,009 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 17:12:36,222 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:36,223 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:36,223 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:36,224 INFO  L82        PathProgramCache]: Analyzing trace with hash 1221411293, now seen corresponding path program 1 times
[2020-07-20 17:12:36,224 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:36,225 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772720137]
[2020-07-20 17:12:36,225 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 17:12:36,263 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:36,263 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:36,264 INFO  L263         TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:36,266 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:36,277 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 17:12:36,278 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:36,278 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772720137]
[2020-07-20 17:12:36,279 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:36,279 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:36,279 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672097841]
[2020-07-20 17:12:36,280 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:36,280 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:36,281 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:36,281 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:36,281 INFO  L87              Difference]: Start difference. First operand 776 states and 1110 transitions. Second operand 3 states.
[2020-07-20 17:12:36,315 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:36,315 INFO  L93              Difference]: Finished difference Result 1164 states and 1656 transitions.
[2020-07-20 17:12:36,316 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:36,316 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 17:12:36,317 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:36,321 INFO  L225             Difference]: With dead ends: 1164
[2020-07-20 17:12:36,322 INFO  L226             Difference]: Without dead ends: 794
[2020-07-20 17:12:36,324 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 17:12:36,326 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 794 states.
[2020-07-20 17:12:36,352 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 792.
[2020-07-20 17:12:36,352 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 792 states.
[2020-07-20 17:12:36,356 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 1110 transitions.
[2020-07-20 17:12:36,357 INFO  L78                 Accepts]: Start accepts. Automaton has 792 states and 1110 transitions. Word has length 23
[2020-07-20 17:12:36,357 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:36,357 INFO  L479      AbstractCegarLoop]: Abstraction has 792 states and 1110 transitions.
[2020-07-20 17:12:36,358 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:36,358 INFO  L276                IsEmpty]: Start isEmpty. Operand 792 states and 1110 transitions.
[2020-07-20 17:12:36,359 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 17:12:36,360 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:36,360 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 17:12:36,574 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:36,576 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:36,576 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:36,577 INFO  L82        PathProgramCache]: Analyzing trace with hash 1479576731, now seen corresponding path program 1 times
[2020-07-20 17:12:36,577 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:36,577 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094389689]
[2020-07-20 17:12:36,578 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 17:12:36,614 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:36,614 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:36,616 INFO  L263         TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:36,617 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:36,634 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 17:12:36,635 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:36,635 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094389689]
[2020-07-20 17:12:36,636 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:36,636 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:36,636 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010982313]
[2020-07-20 17:12:36,637 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:36,639 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:36,640 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:36,640 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:36,640 INFO  L87              Difference]: Start difference. First operand 792 states and 1110 transitions. Second operand 3 states.
[2020-07-20 17:12:36,695 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:36,696 INFO  L93              Difference]: Finished difference Result 1356 states and 1928 transitions.
[2020-07-20 17:12:36,696 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:36,696 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 17:12:36,697 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:36,706 INFO  L225             Difference]: With dead ends: 1356
[2020-07-20 17:12:36,707 INFO  L226             Difference]: Without dead ends: 1354
[2020-07-20 17:12:36,708 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 17:12:36,710 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1354 states.
[2020-07-20 17:12:36,754 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1160.
[2020-07-20 17:12:36,755 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1160 states.
[2020-07-20 17:12:36,762 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1160 states to 1160 states and 1574 transitions.
[2020-07-20 17:12:36,763 INFO  L78                 Accepts]: Start accepts. Automaton has 1160 states and 1574 transitions. Word has length 23
[2020-07-20 17:12:36,764 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:36,764 INFO  L479      AbstractCegarLoop]: Abstraction has 1160 states and 1574 transitions.
[2020-07-20 17:12:36,764 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:36,764 INFO  L276                IsEmpty]: Start isEmpty. Operand 1160 states and 1574 transitions.
[2020-07-20 17:12:36,767 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-07-20 17:12:36,767 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:36,767 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 17:12:36,984 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:36,985 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:36,986 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:36,986 INFO  L82        PathProgramCache]: Analyzing trace with hash -2114325987, now seen corresponding path program 1 times
[2020-07-20 17:12:36,987 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:36,987 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773602738]
[2020-07-20 17:12:36,987 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 17:12:37,048 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:37,049 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:37,050 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:37,052 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:37,069 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 17:12:37,070 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:37,070 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773602738]
[2020-07-20 17:12:37,071 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:37,075 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:37,076 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718314687]
[2020-07-20 17:12:37,077 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:37,077 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:37,078 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:37,078 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:37,078 INFO  L87              Difference]: Start difference. First operand 1160 states and 1574 transitions. Second operand 3 states.
[2020-07-20 17:12:37,154 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:37,155 INFO  L93              Difference]: Finished difference Result 2636 states and 3560 transitions.
[2020-07-20 17:12:37,156 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:37,156 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 23
[2020-07-20 17:12:37,156 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:37,166 INFO  L225             Difference]: With dead ends: 2636
[2020-07-20 17:12:37,167 INFO  L226             Difference]: Without dead ends: 1514
[2020-07-20 17:12:37,172 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 17:12:37,176 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1514 states.
[2020-07-20 17:12:37,248 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1512.
[2020-07-20 17:12:37,249 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1512 states.
[2020-07-20 17:12:37,261 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1990 transitions.
[2020-07-20 17:12:37,262 INFO  L78                 Accepts]: Start accepts. Automaton has 1512 states and 1990 transitions. Word has length 23
[2020-07-20 17:12:37,264 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:37,264 INFO  L479      AbstractCegarLoop]: Abstraction has 1512 states and 1990 transitions.
[2020-07-20 17:12:37,264 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:37,264 INFO  L276                IsEmpty]: Start isEmpty. Operand 1512 states and 1990 transitions.
[2020-07-20 17:12:37,269 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-07-20 17:12:37,269 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:37,270 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 17:12:37,484 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:37,485 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:37,486 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:37,486 INFO  L82        PathProgramCache]: Analyzing trace with hash -1377545862, now seen corresponding path program 1 times
[2020-07-20 17:12:37,487 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:37,487 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816239835]
[2020-07-20 17:12:37,488 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 17:12:37,532 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:37,532 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:37,534 INFO  L263         TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:37,535 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:37,542 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 17:12:37,543 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:37,543 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816239835]
[2020-07-20 17:12:37,544 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:37,544 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:37,544 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432632116]
[2020-07-20 17:12:37,545 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:37,545 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:37,546 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:37,546 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:37,546 INFO  L87              Difference]: Start difference. First operand 1512 states and 1990 transitions. Second operand 3 states.
[2020-07-20 17:12:37,605 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:37,606 INFO  L93              Difference]: Finished difference Result 2268 states and 2968 transitions.
[2020-07-20 17:12:37,608 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:37,608 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 24
[2020-07-20 17:12:37,609 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:37,618 INFO  L225             Difference]: With dead ends: 2268
[2020-07-20 17:12:37,618 INFO  L226             Difference]: Without dead ends: 1546
[2020-07-20 17:12:37,621 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 17:12:37,625 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1546 states.
[2020-07-20 17:12:37,680 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1546 to 1544.
[2020-07-20 17:12:37,681 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1544 states.
[2020-07-20 17:12:37,690 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 1990 transitions.
[2020-07-20 17:12:37,690 INFO  L78                 Accepts]: Start accepts. Automaton has 1544 states and 1990 transitions. Word has length 24
[2020-07-20 17:12:37,691 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:37,691 INFO  L479      AbstractCegarLoop]: Abstraction has 1544 states and 1990 transitions.
[2020-07-20 17:12:37,691 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:37,691 INFO  L276                IsEmpty]: Start isEmpty. Operand 1544 states and 1990 transitions.
[2020-07-20 17:12:37,696 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-07-20 17:12:37,696 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:37,697 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 17:12:37,910 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:37,911 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:37,912 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:37,912 INFO  L82        PathProgramCache]: Analyzing trace with hash -1119380424, now seen corresponding path program 1 times
[2020-07-20 17:12:37,912 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:37,913 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437669817]
[2020-07-20 17:12:37,913 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 17:12:37,987 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:37,987 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:37,989 INFO  L263         TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:37,991 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:37,998 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 17:12:37,999 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:37,999 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437669817]
[2020-07-20 17:12:38,000 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:38,000 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:38,000 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205805184]
[2020-07-20 17:12:38,000 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:38,001 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:38,001 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:38,001 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:38,001 INFO  L87              Difference]: Start difference. First operand 1544 states and 1990 transitions. Second operand 3 states.
[2020-07-20 17:12:38,065 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:38,066 INFO  L93              Difference]: Finished difference Result 2572 states and 3336 transitions.
[2020-07-20 17:12:38,066 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:38,067 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 24
[2020-07-20 17:12:38,067 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:38,083 INFO  L225             Difference]: With dead ends: 2572
[2020-07-20 17:12:38,083 INFO  L226             Difference]: Without dead ends: 2570
[2020-07-20 17:12:38,086 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 17:12:38,089 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2570 states.
[2020-07-20 17:12:38,157 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2312.
[2020-07-20 17:12:38,157 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2312 states.
[2020-07-20 17:12:38,167 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 2886 transitions.
[2020-07-20 17:12:38,168 INFO  L78                 Accepts]: Start accepts. Automaton has 2312 states and 2886 transitions. Word has length 24
[2020-07-20 17:12:38,168 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:38,168 INFO  L479      AbstractCegarLoop]: Abstraction has 2312 states and 2886 transitions.
[2020-07-20 17:12:38,168 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:38,169 INFO  L276                IsEmpty]: Start isEmpty. Operand 2312 states and 2886 transitions.
[2020-07-20 17:12:38,173 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-07-20 17:12:38,174 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:38,174 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 17:12:38,387 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:38,388 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:38,389 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:38,389 INFO  L82        PathProgramCache]: Analyzing trace with hash -418315846, now seen corresponding path program 1 times
[2020-07-20 17:12:38,389 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:38,390 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997345371]
[2020-07-20 17:12:38,390 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 17:12:38,427 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:38,428 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:38,429 INFO  L263         TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:38,431 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:38,447 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 17:12:38,448 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:38,448 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997345371]
[2020-07-20 17:12:38,448 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:38,449 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:38,449 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782253520]
[2020-07-20 17:12:38,449 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:38,450 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:38,450 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:38,450 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:38,451 INFO  L87              Difference]: Start difference. First operand 2312 states and 2886 transitions. Second operand 3 states.
[2020-07-20 17:12:38,531 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:38,532 INFO  L93              Difference]: Finished difference Result 5196 states and 6408 transitions.
[2020-07-20 17:12:38,532 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:38,533 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 24
[2020-07-20 17:12:38,533 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:38,550 INFO  L225             Difference]: With dead ends: 5196
[2020-07-20 17:12:38,550 INFO  L226             Difference]: Without dead ends: 2954
[2020-07-20 17:12:38,557 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 17:12:38,562 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2954 states.
[2020-07-20 17:12:38,674 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2954 to 2952.
[2020-07-20 17:12:38,675 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2952 states.
[2020-07-20 17:12:38,685 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2952 states to 2952 states and 3526 transitions.
[2020-07-20 17:12:38,686 INFO  L78                 Accepts]: Start accepts. Automaton has 2952 states and 3526 transitions. Word has length 24
[2020-07-20 17:12:38,686 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:38,686 INFO  L479      AbstractCegarLoop]: Abstraction has 2952 states and 3526 transitions.
[2020-07-20 17:12:38,686 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:38,687 INFO  L276                IsEmpty]: Start isEmpty. Operand 2952 states and 3526 transitions.
[2020-07-20 17:12:38,692 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-07-20 17:12:38,692 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:38,693 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 17:12:38,905 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:38,906 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:38,906 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:38,906 INFO  L82        PathProgramCache]: Analyzing trace with hash -340838702, now seen corresponding path program 1 times
[2020-07-20 17:12:38,907 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:38,907 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812501272]
[2020-07-20 17:12:38,907 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 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 17:12:38,947 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:38,947 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:38,949 INFO  L263         TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:38,950 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:38,964 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 17:12:38,965 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:38,965 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812501272]
[2020-07-20 17:12:38,966 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:38,966 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:38,966 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276264593]
[2020-07-20 17:12:38,967 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:38,967 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:38,968 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:38,968 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:38,968 INFO  L87              Difference]: Start difference. First operand 2952 states and 3526 transitions. Second operand 3 states.
[2020-07-20 17:12:39,043 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:39,044 INFO  L93              Difference]: Finished difference Result 4428 states and 5256 transitions.
[2020-07-20 17:12:39,044 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:39,045 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 25
[2020-07-20 17:12:39,045 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:39,062 INFO  L225             Difference]: With dead ends: 4428
[2020-07-20 17:12:39,063 INFO  L226             Difference]: Without dead ends: 3018
[2020-07-20 17:12:39,068 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 17:12:39,073 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3018 states.
[2020-07-20 17:12:39,170 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3018 to 3016.
[2020-07-20 17:12:39,170 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3016 states.
[2020-07-20 17:12:39,178 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3526 transitions.
[2020-07-20 17:12:39,179 INFO  L78                 Accepts]: Start accepts. Automaton has 3016 states and 3526 transitions. Word has length 25
[2020-07-20 17:12:39,179 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:39,179 INFO  L479      AbstractCegarLoop]: Abstraction has 3016 states and 3526 transitions.
[2020-07-20 17:12:39,179 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:39,180 INFO  L276                IsEmpty]: Start isEmpty. Operand 3016 states and 3526 transitions.
[2020-07-20 17:12:39,185 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-07-20 17:12:39,185 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:39,185 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 17:12:39,398 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:39,399 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:39,399 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:39,399 INFO  L82        PathProgramCache]: Analyzing trace with hash -82673264, now seen corresponding path program 1 times
[2020-07-20 17:12:39,400 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:39,400 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92302615]
[2020-07-20 17:12:39,400 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 17:12:39,440 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:39,441 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:39,442 INFO  L263         TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:39,444 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:39,456 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 17:12:39,457 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:39,457 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92302615]
[2020-07-20 17:12:39,457 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:39,457 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:39,458 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226220606]
[2020-07-20 17:12:39,458 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:39,458 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:39,459 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:39,459 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:39,459 INFO  L87              Difference]: Start difference. First operand 3016 states and 3526 transitions. Second operand 3 states.
[2020-07-20 17:12:39,574 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:39,574 INFO  L93              Difference]: Finished difference Result 8650 states and 9799 transitions.
[2020-07-20 17:12:39,575 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:39,575 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 25
[2020-07-20 17:12:39,575 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:39,590 INFO  L225             Difference]: With dead ends: 8650
[2020-07-20 17:12:39,591 INFO  L226             Difference]: Without dead ends: 3016
[2020-07-20 17:12:39,605 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 17:12:39,611 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 3016 states.
[2020-07-20 17:12:39,702 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 3016 to 3016.
[2020-07-20 17:12:39,702 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 3016 states.
[2020-07-20 17:12:39,711 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 3016 states to 3016 states and 3270 transitions.
[2020-07-20 17:12:39,712 INFO  L78                 Accepts]: Start accepts. Automaton has 3016 states and 3270 transitions. Word has length 25
[2020-07-20 17:12:39,712 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:39,712 INFO  L479      AbstractCegarLoop]: Abstraction has 3016 states and 3270 transitions.
[2020-07-20 17:12:39,712 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:39,712 INFO  L276                IsEmpty]: Start isEmpty. Operand 3016 states and 3270 transitions.
[2020-07-20 17:12:39,718 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-07-20 17:12:39,718 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 17:12:39,718 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 17:12:39,933 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:39,934 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 17:12:39,935 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 17:12:39,935 INFO  L82        PathProgramCache]: Analyzing trace with hash -783737842, now seen corresponding path program 1 times
[2020-07-20 17:12:39,935 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 17:12:39,936 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250050717]
[2020-07-20 17:12:39,936 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 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 17:12:39,972 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 17:12:39,973 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 17:12:39,973 INFO  L263         TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-20 17:12:39,974 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 17:12:39,980 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 17:12:39,981 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 17:12:39,981 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250050717]
[2020-07-20 17:12:39,981 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 17:12:39,981 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-20 17:12:39,982 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679142048]
[2020-07-20 17:12:39,982 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-20 17:12:39,982 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 17:12:39,982 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-20 17:12:39,982 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-20 17:12:39,983 INFO  L87              Difference]: Start difference. First operand 3016 states and 3270 transitions. Second operand 3 states.
[2020-07-20 17:12:40,048 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 17:12:40,049 INFO  L93              Difference]: Finished difference Result 3016 states and 3270 transitions.
[2020-07-20 17:12:40,050 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-20 17:12:40,050 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 25
[2020-07-20 17:12:40,050 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 17:12:40,051 INFO  L225             Difference]: With dead ends: 3016
[2020-07-20 17:12:40,051 INFO  L226             Difference]: Without dead ends: 0
[2020-07-20 17:12:40,059 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 17:12:40,060 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 0 states.
[2020-07-20 17:12:40,060 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0.
[2020-07-20 17:12:40,060 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 0 states.
[2020-07-20 17:12:40,060 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions.
[2020-07-20 17:12:40,061 INFO  L78                 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 25
[2020-07-20 17:12:40,061 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 17:12:40,061 INFO  L479      AbstractCegarLoop]: Abstraction has 0 states and 0 transitions.
[2020-07-20 17:12:40,061 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-20 17:12:40,062 INFO  L276                IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions.
[2020-07-20 17:12:40,062 INFO  L282                IsEmpty]: Finished isEmpty. No accepting run.
[2020-07-20 17:12:40,276 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 17:12:40,281 INFO  L343    DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.
[2020-07-20 17:12:40,395 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.initFINAL(line -1)  the Hoare annotation is:  true
[2020-07-20 17:12:40,396 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.initEXIT(line -1)  no Hoare annotation was computed.
[2020-07-20 17:12:40,396 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startEXIT(line -1)  no Hoare annotation was computed.
[2020-07-20 17:12:40,396 INFO  L271        CegarLoopResult]: At program point  L-1(line -1)  the Hoare annotation is:  true
[2020-07-20 17:12:40,397 INFO  L271        CegarLoopResult]: At program point  ULTIMATE.startENTRY(line -1)  the Hoare annotation is:  true
[2020-07-20 17:12:40,397 INFO  L268        CegarLoopResult]: For program point  ULTIMATE.startFINAL(line -1)  no Hoare annotation was computed.
[2020-07-20 17:12:40,397 INFO  L268        CegarLoopResult]: For program point  L126(line 126)  no Hoare annotation was computed.
[2020-07-20 17:12:40,397 INFO  L264        CegarLoopResult]: At program point  L126-1(lines 5 135)  the Hoare annotation is:  false
[2020-07-20 17:12:40,398 INFO  L268        CegarLoopResult]: For program point  L60-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,398 INFO  L268        CegarLoopResult]: For program point  mainEXIT(lines 4 135)  no Hoare annotation was computed.
[2020-07-20 17:12:40,398 INFO  L268        CegarLoopResult]: For program point  L110-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,400 INFO  L268        CegarLoopResult]: For program point  L111(line 111)  no Hoare annotation was computed.
[2020-07-20 17:12:40,401 INFO  L268        CegarLoopResult]: For program point  L95-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,402 INFO  L268        CegarLoopResult]: For program point  L120-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,403 INFO  L268        CegarLoopResult]: For program point  mainFINAL(lines 4 135)  no Hoare annotation was computed.
[2020-07-20 17:12:40,403 INFO  L268        CegarLoopResult]: For program point  L96(line 96)  no Hoare annotation was computed.
[2020-07-20 17:12:40,404 INFO  L268        CegarLoopResult]: For program point  mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 133)  no Hoare annotation was computed.
[2020-07-20 17:12:40,404 INFO  L271        CegarLoopResult]: At program point  mainENTRY(lines 4 135)  the Hoare annotation is:  true
[2020-07-20 17:12:40,404 INFO  L268        CegarLoopResult]: For program point  L121(line 121)  no Hoare annotation was computed.
[2020-07-20 17:12:40,406 INFO  L268        CegarLoopResult]: For program point  L80-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,406 INFO  L268        CegarLoopResult]: For program point  L105-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,407 INFO  L268        CegarLoopResult]: For program point  L72-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,407 INFO  L268        CegarLoopResult]: For program point  L64-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,407 INFO  L268        CegarLoopResult]: For program point  L56(lines 56 58)  no Hoare annotation was computed.
[2020-07-20 17:12:40,407 INFO  L268        CegarLoopResult]: For program point  L56-2(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,408 INFO  L268        CegarLoopResult]: For program point  L106(line 106)  no Hoare annotation was computed.
[2020-07-20 17:12:40,408 INFO  L271        CegarLoopResult]: At program point  L131(lines 5 135)  the Hoare annotation is:  true
[2020-07-20 17:12:40,408 INFO  L268        CegarLoopResult]: For program point  L90-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,410 INFO  L268        CegarLoopResult]: For program point  L115-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,410 INFO  L268        CegarLoopResult]: For program point  L91(line 91)  no Hoare annotation was computed.
[2020-07-20 17:12:40,411 INFO  L268        CegarLoopResult]: For program point  L116(line 116)  no Hoare annotation was computed.
[2020-07-20 17:12:40,411 INFO  L268        CegarLoopResult]: For program point  L100-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,411 INFO  L271        CegarLoopResult]: At program point  L125-1(lines 33 130)  the Hoare annotation is:  true
[2020-07-20 17:12:40,412 INFO  L268        CegarLoopResult]: For program point  L84-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,412 INFO  L268        CegarLoopResult]: For program point  L76-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,412 INFO  L268        CegarLoopResult]: For program point  L101(line 101)  no Hoare annotation was computed.
[2020-07-20 17:12:40,412 INFO  L268        CegarLoopResult]: For program point  L35(lines 35 37)  no Hoare annotation was computed.
[2020-07-20 17:12:40,413 INFO  L268        CegarLoopResult]: For program point  L68-1(lines 33 130)  no Hoare annotation was computed.
[2020-07-20 17:12:40,441 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:12:40 BoogieIcfgContainer
[2020-07-20 17:12:40,441 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-20 17:12:40,452 INFO  L168              Benchmark]: Toolchain (without parser) took 10695.66 ms. Allocated memory was 136.8 MB in the beginning and 292.0 MB in the end (delta: 155.2 MB). Free memory was 99.4 MB in the beginning and 87.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,457 INFO  L168              Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 136.8 MB. Free memory was 118.0 MB in the beginning and 117.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,461 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 378.22 ms. Allocated memory is still 136.8 MB. Free memory was 99.0 MB in the beginning and 88.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,467 INFO  L168              Benchmark]: Boogie Preprocessor took 157.32 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 88.5 MB in the beginning and 179.9 MB in the end (delta: -91.4 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,468 INFO  L168              Benchmark]: RCFGBuilder took 449.29 ms. Allocated memory is still 201.9 MB. Free memory was 179.9 MB in the beginning and 161.9 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,469 INFO  L168              Benchmark]: TraceAbstraction took 9699.84 ms. Allocated memory was 201.9 MB in the beginning and 292.0 MB in the end (delta: 90.2 MB). Free memory was 161.2 MB in the beginning and 87.0 MB in the end (delta: 74.3 MB). Peak memory consumption was 164.4 MB. Max. memory is 7.1 GB.
[2020-07-20 17:12:40,477 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.37 ms. Allocated memory is still 136.8 MB. Free memory was 118.0 MB in the beginning and 117.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 378.22 ms. Allocated memory is still 136.8 MB. Free memory was 99.0 MB in the beginning and 88.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 157.32 ms. Allocated memory was 136.8 MB in the beginning and 201.9 MB in the end (delta: 65.0 MB). Free memory was 88.5 MB in the beginning and 179.9 MB in the end (delta: -91.4 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 449.29 ms. Allocated memory is still 201.9 MB. Free memory was 179.9 MB in the beginning and 161.9 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 9699.84 ms. Allocated memory was 201.9 MB in the beginning and 292.0 MB in the end (delta: 90.2 MB). Free memory was 161.2 MB in the beginning and 87.0 MB in the end (delta: 74.3 MB). Peak memory consumption was 164.4 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - PositiveResult [Line: 133]: 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: 33]: 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, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 9.4s, OverallIterations: 23, TraceHistogramMax: 1, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1573 SDtfs, 755 SDslu, 1056 SDs, 0 SdLazy, 121 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 475 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3016occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.9s AutomataMinimizationTime, 23 MinimizatonAttempts, 790 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 266 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 498 NumberOfCodeBlocks, 495 NumberOfCodeBlocksAsserted, 91 NumberOfCheckSat, 475 ConstructedInterpolants, 0 QuantifiedInterpolants, 19027 SizeOfPredicates, 0 NumberOfNonLiveVariables, 2129 ConjunctsInSsa, 69 ConjunctsInUnsatCore, 23 InterpolantComputations, 23 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...