/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c


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


This is Ultimate 0.1.25-d623d84
[2020-07-21 00:52:28,594 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-21 00:52:28,597 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-21 00:52:28,613 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-21 00:52:28,613 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-21 00:52:28,615 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-21 00:52:28,617 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-21 00:52:28,626 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
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[2020-07-21 00:52:28,631 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-21 00:52:28,632 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-21 00:52:28,633 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-21 00:52:28,636 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-21 00:52:28,638 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-21 00:52:28,640 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-21 00:52:28,642 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-21 00:52:28,643 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-21 00:52:28,644 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-21 00:52:28,646 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2020-07-21 00:52:28,647 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
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[2020-07-21 00:52:28,656 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-21 00:52:28,658 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-21 00:52:28,659 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-07-21 00:52:28,677 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-21 00:52:28,678 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-21 00:52:28,679 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-21 00:52:28,680 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-21 00:52:28,680 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-21 00:52:28,680 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-21 00:52:28,681 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-21 00:52:28,682 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-21 00:52:28,682 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-21 00:52:28,682 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-21 00:52:28,682 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-21 00:52:28,682 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-21 00:52:28,683 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-21 00:52:28,683 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-21 00:52:28,683 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-21 00:52:28,683 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-21 00:52:28,684 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-21 00:52:28,684 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-21 00:52:28,684 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-21 00:52:28,684 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-21 00:52:28,684 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-21 00:52:28,685 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:28,685 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-21 00:52:28,685 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-21 00:52:28,685 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-21 00:52:29,020 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-21 00:52:29,049 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-21 00:52:29,056 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-21 00:52:29,059 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-21 00:52:29,059 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-21 00:52:29,062 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c
[2020-07-21 00:52:29,178 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5/FLAGc43038504
[2020-07-21 00:52:29,883 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-21 00:52:29,884 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c
[2020-07-21 00:52:29,897 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5/FLAGc43038504
[2020-07-21 00:52:30,220 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aeb14cc19/41708b57655340a39d64d6dfcb2f80b5
[2020-07-21 00:52:30,232 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-21 00:52:30,236 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-21 00:52:30,238 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-21 00:52:30,238 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-21 00:52:30,242 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-21 00:52:30,244 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,248 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f6675be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30, skipping insertion in model container
[2020-07-21 00:52:30,249 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,261 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-21 00:52:30,282 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-21 00:52:30,493 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 00:52:30,501 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-21 00:52:30,522 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 00:52:30,544 INFO  L208         MainTranslator]: Completed translation
[2020-07-21 00:52:30,544 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30 WrapperNode
[2020-07-21 00:52:30,545 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-21 00:52:30,546 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-21 00:52:30,547 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-21 00:52:30,547 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-21 00:52:30,566 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,566 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,573 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,574 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,579 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,582 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,584 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (1/1) ...
[2020-07-21 00:52:30,586 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-21 00:52:30,587 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-21 00:52:30,587 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-21 00:52:30,587 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-21 00:52:30,589 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (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
[2020-07-21 00:52:30,784 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-21 00:52:30,784 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-21 00:52:30,785 INFO  L138     BoogieDeclarations]: Found implementation of procedure id
[2020-07-21 00:52:30,785 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-21 00:52:30,785 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-21 00:52:30,785 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-21 00:52:30,785 INFO  L130     BoogieDeclarations]: Found specification of procedure id
[2020-07-21 00:52:30,786 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-21 00:52:30,786 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-21 00:52:30,786 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-21 00:52:31,015 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-21 00:52:31,016 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-21 00:52:31,023 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:31 BoogieIcfgContainer
[2020-07-21 00:52:31,023 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-21 00:52:31,026 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-21 00:52:31,026 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-21 00:52:31,032 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-21 00:52:31,033 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 12:52:30" (1/3) ...
[2020-07-21 00:52:31,035 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c6c1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:31, skipping insertion in model container
[2020-07-21 00:52:31,035 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 12:52:30" (2/3) ...
[2020-07-21 00:52:31,037 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39c6c1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 12:52:31, skipping insertion in model container
[2020-07-21 00:52:31,037 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 12:52:31" (3/3) ...
[2020-07-21 00:52:31,040 INFO  L109   eAbstractionObserver]: Analyzing ICFG id_b3_o2-2.c
[2020-07-21 00:52:31,056 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-21 00:52:31,079 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-21 00:52:31,160 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-21 00:52:31,230 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-21 00:52:31,230 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-21 00:52:31,230 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-21 00:52:31,231 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-21 00:52:31,231 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-21 00:52:31,231 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-21 00:52:31,231 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-21 00:52:31,232 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-21 00:52:31,257 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states.
[2020-07-21 00:52:31,265 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-07-21 00:52:31,265 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 00:52:31,267 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 00:52:31,268 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 00:52:31,277 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 00:52:31,278 INFO  L82        PathProgramCache]: Analyzing trace with hash 1250208381, now seen corresponding path program 1 times
[2020-07-21 00:52:31,289 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 00:52:31,290 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318384472]
[2020-07-21 00:52:31,291 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:31,382 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-21 00:52:31,383 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 00:52:31,386 INFO  L263         TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-21 00:52:31,395 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 00:52:31,518 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 00:52:31,519 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 00:52:31,520 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318384472]
[2020-07-21 00:52:31,522 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 00:52:31,523 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-21 00:52:31,524 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138259079]
[2020-07-21 00:52:31,532 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-21 00:52:31,533 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 00:52:31,547 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-21 00:52:31,548 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-21 00:52:31,551 INFO  L87              Difference]: Start difference. First operand 21 states. Second operand 5 states.
[2020-07-21 00:52:31,628 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 00:52:31,628 INFO  L93              Difference]: Finished difference Result 33 states and 37 transitions.
[2020-07-21 00:52:31,629 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-21 00:52:31,631 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-07-21 00:52:31,632 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 00:52:31,644 INFO  L225             Difference]: With dead ends: 33
[2020-07-21 00:52:31,644 INFO  L226             Difference]: Without dead ends: 19
[2020-07-21 00:52:31,650 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
[2020-07-21 00:52:31,678 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-07-21 00:52:31,715 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-07-21 00:52:31,717 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-07-21 00:52:31,719 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions.
[2020-07-21 00:52:31,722 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13
[2020-07-21 00:52:31,722 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 00:52:31,723 INFO  L479      AbstractCegarLoop]: Abstraction has 19 states and 21 transitions.
[2020-07-21 00:52:31,723 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-21 00:52:31,723 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions.
[2020-07-21 00:52:31,726 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-21 00:52:31,727 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 00:52:31,727 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 00:52:31,942 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:31,943 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 00:52:31,943 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 00:52:31,943 INFO  L82        PathProgramCache]: Analyzing trace with hash -1951994857, now seen corresponding path program 1 times
[2020-07-21 00:52:31,943 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 00:52:31,944 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016994673]
[2020-07-21 00:52:31,944 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:31,984 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-21 00:52:31,985 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 00:52:31,986 INFO  L263         TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-21 00:52:31,989 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 00:52:32,033 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-07-21 00:52:32,034 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 00:52:32,034 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016994673]
[2020-07-21 00:52:32,035 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 00:52:32,035 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-21 00:52:32,035 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415052021]
[2020-07-21 00:52:32,037 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-21 00:52:32,038 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 00:52:32,038 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-21 00:52:32,039 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-21 00:52:32,039 INFO  L87              Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states.
[2020-07-21 00:52:32,071 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 00:52:32,072 INFO  L93              Difference]: Finished difference Result 31 states and 36 transitions.
[2020-07-21 00:52:32,072 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-21 00:52:32,073 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 20
[2020-07-21 00:52:32,073 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 00:52:32,075 INFO  L225             Difference]: With dead ends: 31
[2020-07-21 00:52:32,075 INFO  L226             Difference]: Without dead ends: 23
[2020-07-21 00:52:32,077 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-21 00:52:32,078 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2020-07-21 00:52:32,084 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21.
[2020-07-21 00:52:32,085 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 21 states.
[2020-07-21 00:52:32,086 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions.
[2020-07-21 00:52:32,087 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 20
[2020-07-21 00:52:32,087 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 00:52:32,088 INFO  L479      AbstractCegarLoop]: Abstraction has 21 states and 23 transitions.
[2020-07-21 00:52:32,088 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-21 00:52:32,088 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions.
[2020-07-21 00:52:32,089 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-07-21 00:52:32,089 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 00:52:32,090 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 00:52:32,290 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:32,293 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 00:52:32,294 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 00:52:32,294 INFO  L82        PathProgramCache]: Analyzing trace with hash -1923365706, now seen corresponding path program 1 times
[2020-07-21 00:52:32,295 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 00:52:32,295 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903373741]
[2020-07-21 00:52:32,296 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:32,345 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 00:52:32,346 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 00:52:32,348 INFO  L263         TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 7 conjunts are in the unsatisfiable core
[2020-07-21 00:52:32,351 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 00:52:32,470 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-07-21 00:52:32,471 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 00:52:32,686 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-07-21 00:52:32,687 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903373741]
[2020-07-21 00:52:32,687 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 00:52:32,688 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8
[2020-07-21 00:52:32,688 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399396689]
[2020-07-21 00:52:32,689 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-07-21 00:52:32,689 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 00:52:32,690 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-07-21 00:52:32,690 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56
[2020-07-21 00:52:32,691 INFO  L87              Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states.
[2020-07-21 00:52:32,770 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 00:52:32,771 INFO  L93              Difference]: Finished difference Result 27 states and 29 transitions.
[2020-07-21 00:52:32,772 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-21 00:52:32,772 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 20
[2020-07-21 00:52:32,773 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 00:52:32,774 INFO  L225             Difference]: With dead ends: 27
[2020-07-21 00:52:32,775 INFO  L226             Difference]: Without dead ends: 23
[2020-07-21 00:52:32,776 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 6 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2020-07-21 00:52:32,777 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2020-07-21 00:52:32,783 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23.
[2020-07-21 00:52:32,784 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 23 states.
[2020-07-21 00:52:32,785 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions.
[2020-07-21 00:52:32,786 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20
[2020-07-21 00:52:32,786 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 00:52:32,787 INFO  L479      AbstractCegarLoop]: Abstraction has 23 states and 25 transitions.
[2020-07-21 00:52:32,787 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-07-21 00:52:32,787 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions.
[2020-07-21 00:52:32,789 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-21 00:52:32,789 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 00:52:32,789 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 00:52:33,004 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:33,006 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 00:52:33,007 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 00:52:33,007 INFO  L82        PathProgramCache]: Analyzing trace with hash 376843494, now seen corresponding path program 1 times
[2020-07-21 00:52:33,008 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 00:52:33,008 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392232342]
[2020-07-21 00:52:33,009 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:33,105 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 00:52:33,106 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 00:52:33,108 INFO  L263         TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core
[2020-07-21 00:52:33,113 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 00:52:33,232 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked.
[2020-07-21 00:52:33,238 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 00:52:33,531 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked.
[2020-07-21 00:52:33,532 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392232342]
[2020-07-21 00:52:33,532 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 00:52:33,533 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11
[2020-07-21 00:52:33,533 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436659398]
[2020-07-21 00:52:33,534 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-07-21 00:52:33,535 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 00:52:33,535 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-07-21 00:52:33,536 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110
[2020-07-21 00:52:33,536 INFO  L87              Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 11 states.
[2020-07-21 00:52:33,617 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 00:52:33,618 INFO  L93              Difference]: Finished difference Result 39 states and 46 transitions.
[2020-07-21 00:52:33,619 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-07-21 00:52:33,619 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 27
[2020-07-21 00:52:33,620 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 00:52:33,621 INFO  L225             Difference]: With dead ends: 39
[2020-07-21 00:52:33,621 INFO  L226             Difference]: Without dead ends: 31
[2020-07-21 00:52:33,622 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156
[2020-07-21 00:52:33,623 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-07-21 00:52:33,630 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29.
[2020-07-21 00:52:33,631 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 29 states.
[2020-07-21 00:52:33,633 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions.
[2020-07-21 00:52:33,633 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 27
[2020-07-21 00:52:33,634 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 00:52:33,634 INFO  L479      AbstractCegarLoop]: Abstraction has 29 states and 32 transitions.
[2020-07-21 00:52:33,634 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-07-21 00:52:33,634 INFO  L276                IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions.
[2020-07-21 00:52:33,635 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-21 00:52:33,636 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 00:52:33,636 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 00:52:33,851 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:33,852 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 00:52:33,852 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 00:52:33,853 INFO  L82        PathProgramCache]: Analyzing trace with hash 405472645, now seen corresponding path program 2 times
[2020-07-21 00:52:33,854 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 00:52:33,855 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119424479]
[2020-07-21 00:52:33,855 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:33,912 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 00:52:33,913 INFO  L229   tOrderPrioritization]: Conjunction of SSA is sat
[2020-07-21 00:52:33,914 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-21 00:52:33,926 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-07-21 00:52:33,927 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-21 00:52:33,950 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-07-21 00:52:33,951 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-07-21 00:52:34,164 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 00:52:34,192 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 12:52:34 BoogieIcfgContainer
[2020-07-21 00:52:34,193 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-21 00:52:34,195 INFO  L168              Benchmark]: Toolchain (without parser) took 3960.43 ms. Allocated memory was 135.8 MB in the beginning and 227.5 MB in the end (delta: 91.8 MB). Free memory was 100.7 MB in the beginning and 152.5 MB in the end (delta: -51.8 MB). Peak memory consumption was 39.9 MB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,197 INFO  L168              Benchmark]: CDTParser took 0.85 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,198 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 307.87 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 91.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,199 INFO  L168              Benchmark]: Boogie Preprocessor took 39.93 ms. Allocated memory is still 135.8 MB. Free memory was 91.0 MB in the beginning and 89.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,199 INFO  L168              Benchmark]: RCFGBuilder took 436.49 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 166.9 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,201 INFO  L168              Benchmark]: TraceAbstraction took 3166.90 ms. Allocated memory was 199.2 MB in the beginning and 227.5 MB in the end (delta: 28.3 MB). Free memory was 166.2 MB in the beginning and 152.5 MB in the end (delta: 13.7 MB). Peak memory consumption was 42.0 MB. Max. memory is 7.1 GB.
[2020-07-21 00:52:34,205 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.85 ms. Allocated memory is still 135.8 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 307.87 ms. Allocated memory is still 135.8 MB. Free memory was 100.3 MB in the beginning and 91.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 39.93 ms. Allocated memory is still 135.8 MB. Free memory was 91.0 MB in the beginning and 89.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 436.49 ms. Allocated memory was 135.8 MB in the beginning and 199.2 MB in the end (delta: 63.4 MB). Free memory was 89.6 MB in the beginning and 166.9 MB in the end (delta: -77.2 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 3166.90 ms. Allocated memory was 199.2 MB in the beginning and 227.5 MB in the end (delta: 28.3 MB). Free memory was 166.2 MB in the beginning and 152.5 MB in the end (delta: 13.7 MB). Peak memory consumption was 42.0 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 15]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L12]              int input = __VERIFIER_nondet_int();
[L13]  CALL, EXPR  id(input)
       VAL         [\old(x)=2]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=2, x=2]
[L6]   CALL, EXPR  id((unsigned int)x-1)
       VAL         [\old(x)=1]
[L5]   COND FALSE  !(x==0)
       VAL         [\old(x)=1, x=1]
[L6]   CALL, EXPR  id((unsigned int)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((unsigned int)x-1)
       VAL         [\old(x)=1, id((unsigned int)x-1)=0, x=1]
[L6]               int ret = id((unsigned int)x-1) + 1;
[L7]   COND FALSE  !(ret > 3)
[L8]               return ret;
       VAL         [\old(x)=1, \result=1, ret=1, x=1]
[L6]   RET, EXPR   id((unsigned int)x-1)
       VAL         [\old(x)=2, id((unsigned int)x-1)=1, x=2]
[L6]               int ret = id((unsigned int)x-1) + 1;
[L7]   COND FALSE  !(ret > 3)
[L8]               return ret;
       VAL         [\old(x)=2, \result=2, ret=2, x=2]
[L13]  RET, EXPR   id(input)
       VAL         [id(input)=2, input=2]
[L13]              int result = id(input);
[L14]  COND TRUE   result == 2
       VAL         [input=2, result=2]
[L15]              __VERIFIER_error()
       VAL         [input=2, result=2]

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.9s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 77 SDtfs, 14 SDslu, 265 SDs, 0 SdLazy, 62 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 126 GetRequests, 93 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=4, 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, 4 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 107 NumberOfCodeBlocks, 101 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 121 ConstructedInterpolants, 0 QuantifiedInterpolants, 4267 SizeOfPredicates, 6 NumberOfNonLiveVariables, 193 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 30/42 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...