/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o20.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-20 21:39:06,556 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 21:39:06,558 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-20 21:39:06,570 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-20 21:39:06,571 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 21:39:06,572 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 21:39:06,574 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-20 21:39:06,581 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-20 21:39:06,582 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-20 21:39:06,583 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-20 21:39:06,584 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 21:39:06,585 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 21:39:06,586 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 21:39:06,588 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 21:39:06,590 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 21:39:06,592 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 21:39:06,593 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 21:39:06,594 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 21:39:06,595 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 21:39:06,599 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-20 21:39:06,599 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-20 21:39:06,599 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
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[2020-07-20 21:39:06,601 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-20 21:39:06,602 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-20 21:39:06,602 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-20 21:39:06,607 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
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[2020-07-20 21:39:06,607 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 21:39:06,609 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 21:39:06,610 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-07-20 21:39:06,626 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 21:39:06,626 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 21:39:06,627 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 21:39:06,628 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 21:39:06,628 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 21:39:06,628 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 21:39:06,628 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 21:39:06,628 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 21:39:06,629 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 21:39:06,629 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 21:39:06,629 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 21:39:06,629 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 21:39:06,629 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 21:39:06,630 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 21:39:06,630 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 21:39:06,630 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 21:39:06,630 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 21:39:06,630 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 21:39:06,631 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 21:39:06,631 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 21:39:06,631 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 21:39:06,631 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 21:39:06,631 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 21:39:06,632 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 21:39:06,632 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 21:39:06,632 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 21:39:06,632 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:06,632 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 21:39:06,633 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 21:39:06,633 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-20 21:39:06,928 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 21:39:06,952 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 21:39:06,956 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 21:39:06,958 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 21:39:06,958 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 21:39:06,959 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o20.c
[2020-07-20 21:39:07,052 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20161c414/446e7b17036f4a0f92374a22f820b47a/FLAG225903fd4
[2020-07-20 21:39:07,576 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 21:39:07,576 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o20.c
[2020-07-20 21:39:07,583 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20161c414/446e7b17036f4a0f92374a22f820b47a/FLAG225903fd4
[2020-07-20 21:39:07,947 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/20161c414/446e7b17036f4a0f92374a22f820b47a
[2020-07-20 21:39:07,955 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 21:39:07,958 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 21:39:07,959 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 21:39:07,959 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 21:39:07,963 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 21:39:07,964 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:39:07" (1/1) ...
[2020-07-20 21:39:07,967 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41361c51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:07, skipping insertion in model container
[2020-07-20 21:39:07,967 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:39:07" (1/1) ...
[2020-07-20 21:39:07,975 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 21:39:07,991 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 21:39:08,157 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 21:39:08,161 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 21:39:08,174 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 21:39:08,187 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 21:39:08,188 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08 WrapperNode
[2020-07-20 21:39:08,188 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 21:39:08,189 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 21:39:08,189 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 21:39:08,189 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 21:39:08,199 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,199 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,204 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,205 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,208 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,210 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,211 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
[2020-07-20 21:39:08,212 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 21:39:08,213 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 21:39:08,213 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 21:39:08,213 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 21:39:08,214 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (1/1) ...
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 21:39:08,361 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 21:39:08,361 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 21:39:08,361 INFO  L138     BoogieDeclarations]: Found implementation of procedure id
[2020-07-20 21:39:08,361 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 21:39:08,361 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint
[2020-07-20 21:39:08,362 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 21:39:08,362 INFO  L130     BoogieDeclarations]: Found specification of procedure id
[2020-07-20 21:39:08,362 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 21:39:08,362 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 21:39:08,362 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 21:39:08,527 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 21:39:08,528 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 21:39:08,531 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:39:08 BoogieIcfgContainer
[2020-07-20 21:39:08,532 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 21:39:08,533 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 21:39:08,533 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 21:39:08,536 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 21:39:08,537 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:39:07" (1/3) ...
[2020-07-20 21:39:08,538 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71a67b91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:39:08, skipping insertion in model container
[2020-07-20 21:39:08,538 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:39:08" (2/3) ...
[2020-07-20 21:39:08,538 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71a67b91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:39:08, skipping insertion in model container
[2020-07-20 21:39:08,538 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:39:08" (3/3) ...
[2020-07-20 21:39:08,540 INFO  L109   eAbstractionObserver]: Analyzing ICFG id_o20.c
[2020-07-20 21:39:08,548 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 21:39:08,554 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 21:39:08,569 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 21:39:08,594 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 21:39:08,594 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 21:39:08,594 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 21:39:08,595 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 21:39:08,595 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 21:39:08,595 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 21:39:08,595 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 21:39:08,595 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 21:39:08,610 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states.
[2020-07-20 21:39:08,616 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-07-20 21:39:08,617 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:39:08,618 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 21:39:08,618 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:39:08,623 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:39:08,624 INFO  L82        PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times
[2020-07-20 21:39:08,632 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:39:08,632 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033355945]
[2020-07-20 21:39:08,633 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:08,706 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-20 21:39:08,707 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:39:08,714 INFO  L263         TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 21:39:08,734 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:39:08,877 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 21:39:08,877 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 21:39:08,879 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033355945]
[2020-07-20 21:39:08,880 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 21:39:08,880 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 21:39:08,881 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172664621]
[2020-07-20 21:39:08,887 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 21:39:08,888 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:39:08,903 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 21:39:08,904 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 21:39:08,906 INFO  L87              Difference]: Start difference. First operand 20 states. Second operand 5 states.
[2020-07-20 21:39:08,954 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:39:08,955 INFO  L93              Difference]: Finished difference Result 32 states and 35 transitions.
[2020-07-20 21:39:08,956 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 21:39:08,958 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-07-20 21:39:08,958 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:39:08,969 INFO  L225             Difference]: With dead ends: 32
[2020-07-20 21:39:08,969 INFO  L226             Difference]: Without dead ends: 18
[2020-07-20 21:39:08,973 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 21:39:08,991 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2020-07-20 21:39:09,014 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18.
[2020-07-20 21:39:09,015 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2020-07-20 21:39:09,016 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions.
[2020-07-20 21:39:09,018 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13
[2020-07-20 21:39:09,018 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:39:09,018 INFO  L479      AbstractCegarLoop]: Abstraction has 18 states and 19 transitions.
[2020-07-20 21:39:09,018 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 21:39:09,019 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions.
[2020-07-20 21:39:09,021 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2020-07-20 21:39:09,021 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:39:09,021 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 21:39:09,235 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:09,235 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:39:09,236 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:39:09,237 INFO  L82        PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times
[2020-07-20 21:39:09,237 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:39:09,238 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444120478]
[2020-07-20 21:39:09,239 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:09,270 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:39:09,271 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:39:09,273 INFO  L263         TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 11 conjunts are in the unsatisfiable core
[2020-07-20 21:39:09,275 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:39:09,328 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 21:39:09,329 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 21:39:09,531 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 21:39:09,532 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444120478]
[2020-07-20 21:39:09,532 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 21:39:09,532 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12
[2020-07-20 21:39:09,533 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548312773]
[2020-07-20 21:39:09,534 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-20 21:39:09,535 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:39:09,535 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-20 21:39:09,536 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132
[2020-07-20 21:39:09,536 INFO  L87              Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states.
[2020-07-20 21:39:09,588 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:39:09,588 INFO  L93              Difference]: Finished difference Result 30 states and 32 transitions.
[2020-07-20 21:39:09,589 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-07-20 21:39:09,589 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 19
[2020-07-20 21:39:09,589 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:39:09,590 INFO  L225             Difference]: With dead ends: 30
[2020-07-20 21:39:09,590 INFO  L226             Difference]: Without dead ends: 24
[2020-07-20 21:39:09,592 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 21:39:09,593 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2020-07-20 21:39:09,598 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24.
[2020-07-20 21:39:09,598 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 24 states.
[2020-07-20 21:39:09,599 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions.
[2020-07-20 21:39:09,600 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19
[2020-07-20 21:39:09,600 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:39:09,600 INFO  L479      AbstractCegarLoop]: Abstraction has 24 states and 25 transitions.
[2020-07-20 21:39:09,600 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-20 21:39:09,600 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions.
[2020-07-20 21:39:09,602 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-07-20 21:39:09,602 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:39:09,602 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 21:39:09,816 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:09,817 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:39:09,818 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:39:09,818 INFO  L82        PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times
[2020-07-20 21:39:09,819 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:39:09,819 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156558889]
[2020-07-20 21:39:09,820 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:09,862 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:39:09,863 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:39:09,864 INFO  L263         TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 19 conjunts are in the unsatisfiable core
[2020-07-20 21:39:09,867 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:39:10,003 INFO  L134       CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked.
[2020-07-20 21:39:10,003 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 21:39:10,463 INFO  L134       CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked.
[2020-07-20 21:39:10,463 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156558889]
[2020-07-20 21:39:10,464 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 21:39:10,464 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20
[2020-07-20 21:39:10,464 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197266656]
[2020-07-20 21:39:10,465 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 20 states
[2020-07-20 21:39:10,466 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:39:10,466 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants.
[2020-07-20 21:39:10,467 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380
[2020-07-20 21:39:10,467 INFO  L87              Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states.
[2020-07-20 21:39:14,991 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:39:14,991 INFO  L93              Difference]: Finished difference Result 42 states and 46 transitions.
[2020-07-20 21:39:14,992 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. 
[2020-07-20 21:39:14,992 INFO  L78                 Accepts]: Start accepts. Automaton has 20 states. Word has length 31
[2020-07-20 21:39:14,993 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:39:14,994 INFO  L225             Difference]: With dead ends: 42
[2020-07-20 21:39:14,995 INFO  L226             Difference]: Without dead ends: 36
[2020-07-20 21:39:14,996 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=96, Invalid=454, Unknown=2, NotChecked=0, Total=552
[2020-07-20 21:39:14,997 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2020-07-20 21:39:15,003 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36.
[2020-07-20 21:39:15,003 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 36 states.
[2020-07-20 21:39:15,004 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions.
[2020-07-20 21:39:15,005 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31
[2020-07-20 21:39:15,005 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:39:15,005 INFO  L479      AbstractCegarLoop]: Abstraction has 36 states and 37 transitions.
[2020-07-20 21:39:15,005 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 20 states.
[2020-07-20 21:39:15,006 INFO  L276                IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions.
[2020-07-20 21:39:15,007 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 56
[2020-07-20 21:39:15,007 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:39:15,008 INFO  L422         BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 21:39:15,210 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:15,211 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:39:15,212 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:39:15,212 INFO  L82        PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times
[2020-07-20 21:39:15,212 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:39:15,213 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216440320]
[2020-07-20 21:39:15,214 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:15,264 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-20 21:39:15,264 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:39:15,266 INFO  L263         TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 35 conjunts are in the unsatisfiable core
[2020-07-20 21:39:15,269 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:39:15,525 INFO  L134       CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked.
[2020-07-20 21:39:15,526 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 21:39:23,400 INFO  L134       CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 76 refuted. 1 times theorem prover too weak. 77 trivial. 0 not checked.
[2020-07-20 21:39:23,401 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216440320]
[2020-07-20 21:39:23,401 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 21:39:23,401 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36
[2020-07-20 21:39:23,402 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634453773]
[2020-07-20 21:39:23,403 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 36 states
[2020-07-20 21:39:23,403 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:39:23,403 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants.
[2020-07-20 21:39:23,404 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1073, Unknown=3, NotChecked=0, Total=1260
[2020-07-20 21:39:23,404 INFO  L87              Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states.
[2020-07-20 21:39:28,249 WARN  L193               SmtUtils]: Spent 4.20 s on a formula simplification. DAG size of input: 38 DAG size of output: 18
[2020-07-20 21:39:28,665 WARN  L193               SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11
[2020-07-20 21:39:38,002 WARN  L193               SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 28 DAG size of output: 13
[2020-07-20 21:39:40,685 WARN  L193               SmtUtils]: Spent 2.12 s on a formula simplification. DAG size of input: 23 DAG size of output: 13
[2020-07-20 21:39:49,835 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:39:49,835 INFO  L93              Difference]: Finished difference Result 66 states and 74 transitions.
[2020-07-20 21:39:49,837 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. 
[2020-07-20 21:39:49,837 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states. Word has length 55
[2020-07-20 21:39:49,838 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:39:49,840 INFO  L225             Difference]: With dead ends: 66
[2020-07-20 21:39:49,840 INFO  L226             Difference]: Without dead ends: 60
[2020-07-20 21:39:49,842 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 33.3s TimeCoverageRelationStatistics Valid=379, Invalid=1869, Unknown=8, NotChecked=0, Total=2256
[2020-07-20 21:39:49,842 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 60 states.
[2020-07-20 21:39:49,862 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60.
[2020-07-20 21:39:49,862 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 60 states.
[2020-07-20 21:39:49,866 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions.
[2020-07-20 21:39:49,867 INFO  L78                 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55
[2020-07-20 21:39:49,867 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:39:49,867 INFO  L479      AbstractCegarLoop]: Abstraction has 60 states and 61 transitions.
[2020-07-20 21:39:49,867 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 36 states.
[2020-07-20 21:39:49,868 INFO  L276                IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions.
[2020-07-20 21:39:49,874 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 104
[2020-07-20 21:39:49,874 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:39:49,877 INFO  L422         BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 21:39:50,090 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:50,091 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:39:50,092 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:39:50,092 INFO  L82        PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times
[2020-07-20 21:39:50,093 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:39:50,093 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136817327]
[2020-07-20 21:39:50,094 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:39:50,606 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 21:39:50,607 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-20 21:39:50,610 INFO  L263         TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 68 conjunts are in the unsatisfiable core
[2020-07-20 21:39:50,616 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 21:39:51,348 INFO  L134       CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked.
[2020-07-20 21:39:51,348 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 21:39:56,609 INFO  L134       CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked.
[2020-07-20 21:39:56,610 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136817327]
[2020-07-20 21:39:56,610 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 21:39:56,610 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68
[2020-07-20 21:39:56,611 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674397056]
[2020-07-20 21:39:56,612 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 68 states
[2020-07-20 21:39:56,612 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 21:39:56,613 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants.
[2020-07-20 21:39:56,614 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=3961, Unknown=0, NotChecked=0, Total=4556
[2020-07-20 21:39:56,615 INFO  L87              Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states.
[2020-07-20 21:40:14,996 WARN  L193               SmtUtils]: Spent 9.40 s on a formula simplification that was a NOOP. DAG size: 87
[2020-07-20 21:40:31,706 WARN  L193               SmtUtils]: Spent 11.22 s on a formula simplification that was a NOOP. DAG size: 85
[2020-07-20 21:40:48,963 WARN  L193               SmtUtils]: Spent 10.53 s on a formula simplification that was a NOOP. DAG size: 81
[2020-07-20 21:41:03,744 WARN  L193               SmtUtils]: Spent 7.96 s on a formula simplification that was a NOOP. DAG size: 79
[2020-07-20 21:41:14,177 WARN  L193               SmtUtils]: Spent 4.87 s on a formula simplification that was a NOOP. DAG size: 75
[2020-07-20 21:41:24,197 WARN  L193               SmtUtils]: Spent 5.49 s on a formula simplification that was a NOOP. DAG size: 73
[2020-07-20 21:41:30,514 WARN  L193               SmtUtils]: Spent 3.98 s on a formula simplification that was a NOOP. DAG size: 69
[2020-07-20 21:41:39,039 WARN  L193               SmtUtils]: Spent 6.15 s on a formula simplification that was a NOOP. DAG size: 67
[2020-07-20 21:41:42,324 WARN  L193               SmtUtils]: Spent 1.50 s on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 21:41:46,489 WARN  L193               SmtUtils]: Spent 2.57 s on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 21:41:49,669 WARN  L193               SmtUtils]: Spent 1.62 s on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 21:41:54,994 WARN  L193               SmtUtils]: Spent 3.64 s on a formula simplification that was a NOOP. DAG size: 61
[2020-07-20 21:41:59,578 WARN  L193               SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 57
[2020-07-20 21:42:01,944 WARN  L193               SmtUtils]: Spent 930.00 ms on a formula simplification that was a NOOP. DAG size: 55
[2020-07-20 21:42:03,603 WARN  L193               SmtUtils]: Spent 459.00 ms on a formula simplification that was a NOOP. DAG size: 51
[2020-07-20 21:42:05,157 WARN  L193               SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 49
[2020-07-20 21:42:06,399 WARN  L193               SmtUtils]: Spent 393.00 ms on a formula simplification that was a NOOP. DAG size: 45
[2020-07-20 21:42:07,721 WARN  L193               SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 43
[2020-07-20 21:42:08,631 WARN  L193               SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 39
[2020-07-20 21:42:09,506 WARN  L193               SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 37
[2020-07-20 21:42:17,616 WARN  L193               SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 25
[2020-07-20 21:42:18,775 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 21:42:18,776 INFO  L93              Difference]: Finished difference Result 114 states and 130 transitions.
[2020-07-20 21:42:18,776 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. 
[2020-07-20 21:42:18,776 INFO  L78                 Accepts]: Start accepts. Automaton has 68 states. Word has length 103
[2020-07-20 21:42:18,777 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 21:42:18,780 INFO  L225             Difference]: With dead ends: 114
[2020-07-20 21:42:18,781 INFO  L226             Difference]: Without dead ends: 108
[2020-07-20 21:42:18,784 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 143.6s TimeCoverageRelationStatistics Valid=1287, Invalid=7828, Unknown=5, NotChecked=0, Total=9120
[2020-07-20 21:42:18,785 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 108 states.
[2020-07-20 21:42:18,800 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108.
[2020-07-20 21:42:18,800 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 108 states.
[2020-07-20 21:42:18,802 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions.
[2020-07-20 21:42:18,803 INFO  L78                 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 103
[2020-07-20 21:42:18,804 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 21:42:18,804 INFO  L479      AbstractCegarLoop]: Abstraction has 108 states and 110 transitions.
[2020-07-20 21:42:18,804 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 68 states.
[2020-07-20 21:42:18,804 INFO  L276                IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions.
[2020-07-20 21:42:18,807 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 134
[2020-07-20 21:42:18,807 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 21:42:18,808 INFO  L422         BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 21:42:19,011 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:42:19,012 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 21:42:19,012 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 21:42:19,013 INFO  L82        PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 5 times
[2020-07-20 21:42:19,013 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 21:42:19,014 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579088993]
[2020-07-20 21:42:19,014 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:42:20,577 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-20 21:42:20,578 INFO  L229   tOrderPrioritization]: Conjunction of SSA is sat
[2020-07-20 21:42:20,578 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-20 21:42:21,847 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-07-20 21:42:21,848 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-20 21:42:21,898 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-07-20 21:42:21,898 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-07-20 21:42:22,106 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 21:42:22,167 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:42:22 BoogieIcfgContainer
[2020-07-20 21:42:22,167 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-20 21:42:22,169 INFO  L168              Benchmark]: Toolchain (without parser) took 194212.34 ms. Allocated memory was 137.4 MB in the beginning and 297.3 MB in the end (delta: 159.9 MB). Free memory was 102.3 MB in the beginning and 124.0 MB in the end (delta: -21.7 MB). Peak memory consumption was 138.2 MB. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,170 INFO  L168              Benchmark]: CDTParser took 0.70 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,171 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 229.31 ms. Allocated memory is still 137.4 MB. Free memory was 101.9 MB in the beginning and 92.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,172 INFO  L168              Benchmark]: Boogie Preprocessor took 23.48 ms. Allocated memory is still 137.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,173 INFO  L168              Benchmark]: RCFGBuilder took 318.95 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.3 MB in the beginning and 169.6 MB in the end (delta: -78.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,174 INFO  L168              Benchmark]: TraceAbstraction took 193634.37 ms. Allocated memory was 200.8 MB in the beginning and 297.3 MB in the end (delta: 96.5 MB). Free memory was 168.9 MB in the beginning and 124.0 MB in the end (delta: 44.9 MB). Peak memory consumption was 141.4 MB. Max. memory is 7.1 GB.
[2020-07-20 21:42:22,177 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.70 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 229.31 ms. Allocated memory is still 137.4 MB. Free memory was 101.9 MB in the beginning and 92.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 23.48 ms. Allocated memory is still 137.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 318.95 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.3 MB in the beginning and 169.6 MB in the end (delta: -78.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 193634.37 ms. Allocated memory was 200.8 MB in the beginning and 297.3 MB in the end (delta: 96.5 MB). Free memory was 168.9 MB in the beginning and 124.0 MB in the end (delta: 44.9 MB). Peak memory consumption was 141.4 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L10]              unsigned int input = __VERIFIER_nondet_uint();
[L11]  CALL, EXPR  id(input)
       VAL         [\old(x)=20]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=20, x=20]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=19]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=19, x=19]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=18]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=18, x=18]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=17]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=17, x=17]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=16]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=16, x=16]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=15]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=15, x=15]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=14]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=14, x=14]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=13]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=13, x=13]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=12]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=12, x=12]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=11]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=11, x=11]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=10]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=10, x=10]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=9]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=9, x=9]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=8]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=8, x=8]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=7]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=7, x=7]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=6]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=6, x=6]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=5]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=5, x=5]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=4]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=4, x=4]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=3]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=3, x=3]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=2]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=2, x=2]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=1]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=1, x=1]
[L6]   CALL, EXPR  id(x-1)
       VAL         [\old(x)=0]
[L5]   COND TRUE   x==0
[L5]               return 0;
       VAL         [\old(x)=0, \result=0, x=0]
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=1, id(x-1)=0, x=1]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=2, id(x-1)=1, x=2]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=3, id(x-1)=2, x=3]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=4, id(x-1)=3, x=4]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=5, id(x-1)=4, x=5]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=6, id(x-1)=5, x=6]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=7, id(x-1)=6, x=7]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=8, id(x-1)=7, x=8]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=9, id(x-1)=8, x=9]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=10, id(x-1)=9, x=10]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=11, id(x-1)=10, x=11]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=12, id(x-1)=11, x=12]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=13, id(x-1)=12, x=13]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=14, id(x-1)=13, x=14]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=15, id(x-1)=14, x=15]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=16, id(x-1)=15, x=16]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=17, id(x-1)=16, x=17]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=18, id(x-1)=17, x=18]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=19, id(x-1)=18, x=19]
[L6]               return id(x-1) + 1;
[L6]   RET, EXPR   id(x-1)
       VAL         [\old(x)=20, id(x-1)=19, x=20]
[L6]               return id(x-1) + 1;
[L11]  RET, EXPR   id(input)
       VAL         [id(input)=20, input=20]
[L11]              unsigned int result = id(input);
[L12]  COND TRUE   result == 20
       VAL         [input=20, result=20]
[L13]              __VERIFIER_error()
       VAL         [input=20, result=20]

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 193.5s, OverallIterations: 6, TraceHistogramMax: 21, AutomataDifference: 173.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 137 SDtfs, 2 SDslu, 2336 SDs, 0 SdLazy, 1018 SolverSat, 51 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 468 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 181.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=108occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 2.1s SatisfiabilityAnalysisTime, 15.1s InterpolantComputationTime, 354 NumberOfCodeBlocks, 325 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 420 ConstructedInterpolants, 0 QuantifiedInterpolants, 87606 SizeOfPredicates, 5 NumberOfNonLiveVariables, 423 ConjunctsInSsa, 141 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 878/1756 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 incorrect!
Received shutdown request...