/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/recursive-simple/id_o100.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 16:57:28,486 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 16:57:28,489 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 16:57:28,509 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 16:57:28,510 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 16:57:28,512 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 16:57:28,514 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-20 16:57:28,529 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-20 16:57:28,531 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-20 16:57:28,533 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-20 16:57:28,534 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-07-20 16:57:28,536 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-20 16:57:28,536 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 16:57:28,540 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 16:57:28,541 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 16:57:28,542 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 16:57:28,546 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 16:57:28,548 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 16:57:28,549 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 16:57:28,555 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 16:57:28,556 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 16:57:28,557 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 16:57:28,558 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 16:57:28,559 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 16:57:28,561 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 16:57:28,562 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 16:57:28,562 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-20 16:57:28,563 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-20 16:57:28,563 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 16:57:28,564 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 16:57:28,564 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-20 16:57:28,568 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-07-20 16:57:28,568 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-07-20 16:57:28,569 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 16:57:28,570 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 16:57:28,571 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 16:57:28,586 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 16:57:28,586 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 16:57:28,588 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 16:57:28,588 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 16:57:28,588 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 16:57:28,588 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 16:57:28,588 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 16:57:28,589 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 16:57:28,589 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 16:57:28,589 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 16:57:28,589 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 16:57:28,589 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 16:57:28,590 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 16:57:28,590 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 16:57:28,590 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 16:57:28,590 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 16:57:28,590 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 16:57:28,591 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 16:57:28,591 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 16:57:28,591 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 16:57:28,591 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 16:57:28,591 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 16:57:28,592 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 16:57:28,592 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 16:57:28,592 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 16:57:28,592 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 16:57:28,592 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:57:28,593 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 16:57:28,593 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 16:57:28,593 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 16:57:28,919 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 16:57:28,940 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 16:57:28,944 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 16:57:28,946 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 16:57:28,947 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 16:57:28,948 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c
[2020-07-20 16:57:29,036 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c/FLAGb5543f22a
[2020-07-20 16:57:29,593 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 16:57:29,593 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c
[2020-07-20 16:57:29,601 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c/FLAGb5543f22a
[2020-07-20 16:57:29,938 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c8a5da16e/116b660406fc4531934a43e8412dd81c
[2020-07-20 16:57:29,949 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 16:57:29,952 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 16:57:29,953 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 16:57:29,953 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 16:57:29,957 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 16:57:29,958 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:29" (1/1) ...
[2020-07-20 16:57:29,962 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a462c8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:29, skipping insertion in model container
[2020-07-20 16:57:29,962 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:29" (1/1) ...
[2020-07-20 16:57:29,972 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 16:57:29,994 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 16:57:30,153 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 16:57:30,158 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 16:57:30,176 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 16:57:30,193 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 16:57:30,193 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30 WrapperNode
[2020-07-20 16:57:30,194 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 16:57:30,195 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 16:57:30,195 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 16:57:30,195 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 16:57:30,210 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,211 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,217 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,217 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,221 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,223 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,224 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (1/1) ...
[2020-07-20 16:57:30,225 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 16:57:30,225 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 16:57:30,226 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 16:57:30,226 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 16:57:30,227 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (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 16:57:30,410 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 16:57:30,410 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 16:57:30,410 INFO  L138     BoogieDeclarations]: Found implementation of procedure id
[2020-07-20 16:57:30,410 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 16:57:30,410 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint
[2020-07-20 16:57:30,411 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 16:57:30,411 INFO  L130     BoogieDeclarations]: Found specification of procedure id
[2020-07-20 16:57:30,411 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 16:57:30,411 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 16:57:30,411 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 16:57:30,591 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 16:57:30,591 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 16:57:30,595 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:30 BoogieIcfgContainer
[2020-07-20 16:57:30,595 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 16:57:30,597 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 16:57:30,597 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 16:57:30,601 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 16:57:30,601 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:57:29" (1/3) ...
[2020-07-20 16:57:30,603 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a38609c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:30, skipping insertion in model container
[2020-07-20 16:57:30,603 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:30" (2/3) ...
[2020-07-20 16:57:30,603 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a38609c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:30, skipping insertion in model container
[2020-07-20 16:57:30,604 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:30" (3/3) ...
[2020-07-20 16:57:30,606 INFO  L109   eAbstractionObserver]: Analyzing ICFG id_o100.c
[2020-07-20 16:57:30,618 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 16:57:30,626 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 16:57:30,643 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 16:57:30,671 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 16:57:30,671 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 16:57:30,671 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 16:57:30,672 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 16:57:30,672 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 16:57:30,672 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 16:57:30,672 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 16:57:30,673 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 16:57:30,694 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states.
[2020-07-20 16:57:30,700 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-07-20 16:57:30,701 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:57:30,702 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:57:30,702 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:57:30,710 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:57:30,710 INFO  L82        PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times
[2020-07-20 16:57:30,720 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:57:30,720 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722994946]
[2020-07-20 16:57:30,721 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 16:57:30,819 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 16:57:30,820 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:57:30,824 INFO  L263         TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 7 conjunts are in the unsatisfiable core
[2020-07-20 16:57:30,834 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:57:30,927 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 16:57:30,927 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 16:57:30,929 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722994946]
[2020-07-20 16:57:30,930 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 16:57:30,930 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 16:57:30,931 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205776576]
[2020-07-20 16:57:30,937 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 16:57:30,938 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:57:30,953 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 16:57:30,954 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 16:57:30,956 INFO  L87              Difference]: Start difference. First operand 20 states. Second operand 5 states.
[2020-07-20 16:57:31,019 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:57:31,020 INFO  L93              Difference]: Finished difference Result 32 states and 35 transitions.
[2020-07-20 16:57:31,021 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 16:57:31,023 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-07-20 16:57:31,023 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:57:31,035 INFO  L225             Difference]: With dead ends: 32
[2020-07-20 16:57:31,036 INFO  L226             Difference]: Without dead ends: 18
[2020-07-20 16:57:31,040 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 16:57:31,066 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2020-07-20 16:57:31,091 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18.
[2020-07-20 16:57:31,092 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2020-07-20 16:57:31,094 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions.
[2020-07-20 16:57:31,096 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13
[2020-07-20 16:57:31,096 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:57:31,096 INFO  L479      AbstractCegarLoop]: Abstraction has 18 states and 19 transitions.
[2020-07-20 16:57:31,096 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 16:57:31,097 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions.
[2020-07-20 16:57:31,098 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-07-20 16:57:31,099 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:57:31,099 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:57:31,315 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:57:31,315 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:57:31,316 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:57:31,317 INFO  L82        PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times
[2020-07-20 16:57:31,317 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:57:31,318 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [766719851]
[2020-07-20 16:57:31,319 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 16:57:31,368 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 16:57:31,369 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 16:57:31,372 INFO  L263         TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core
[2020-07-20 16:57:31,375 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 16:57:31,456 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-07-20 16:57:31,456 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 16:57:31,716 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-07-20 16:57:31,717 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [766719851]
[2020-07-20 16:57:31,718 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 16:57:31,718 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12
[2020-07-20 16:57:31,718 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220931452]
[2020-07-20 16:57:31,720 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 16:57:31,721 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 16:57:31,721 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 16:57:31,722 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:57:31,722 INFO  L87              Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states.
[2020-07-20 16:57:31,817 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 16:57:31,818 INFO  L93              Difference]: Finished difference Result 30 states and 32 transitions.
[2020-07-20 16:57:31,818 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-07-20 16:57:31,819 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 19
[2020-07-20 16:57:31,819 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 16:57:31,820 INFO  L225             Difference]: With dead ends: 30
[2020-07-20 16:57:31,820 INFO  L226             Difference]: Without dead ends: 24
[2020-07-20 16:57:31,822 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132
[2020-07-20 16:57:31,822 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2020-07-20 16:57:31,828 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24.
[2020-07-20 16:57:31,828 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 24 states.
[2020-07-20 16:57:31,829 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions.
[2020-07-20 16:57:31,829 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19
[2020-07-20 16:57:31,830 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 16:57:31,830 INFO  L479      AbstractCegarLoop]: Abstraction has 24 states and 25 transitions.
[2020-07-20 16:57:31,830 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 16:57:31,830 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions.
[2020-07-20 16:57:31,831 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-07-20 16:57:31,831 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 16:57:31,832 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 16:57:32,035 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 16:57:32,036 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 16:57:32,037 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 16:57:32,037 INFO  L82        PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times
[2020-07-20 16:57:32,038 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 16:57:32,038 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139005165]
[2020-07-20 16:57:32,039 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