/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_1.i


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


This is Ultimate 0.1.25-d623d84
[2020-07-21 17:00:34,593 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-21 17:00:34,596 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-21 17:00:34,615 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-21 17:00:34,615 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-21 17:00:34,617 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-21 17:00:34,619 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-21 17:00:34,629 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-21 17:00:34,634 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-21 17:00:34,636 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
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[2020-07-21 17:00:34,639 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-21 17:00:34,639 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-21 17:00:34,641 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-21 17:00:34,643 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-21 17:00:34,644 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-21 17:00:34,646 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-21 17:00:34,646 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-21 17:00:34,649 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-21 17:00:34,653 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-21 17:00:34,658 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-21 17:00:34,661 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-21 17:00:34,662 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-21 17:00:34,664 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-21 17:00:34,666 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2020-07-21 17:00:34,666 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-21 17:00:34,669 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-21 17:00:34,669 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
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[2020-07-21 17:00:34,670 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-07-21 17:00:34,675 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-21 17:00:34,676 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-21 17:00:34,677 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 17:00:34,705 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-21 17:00:34,705 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-21 17:00:34,706 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-21 17:00:34,706 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-21 17:00:34,707 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-21 17:00:34,707 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-21 17:00:34,707 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-21 17:00:34,707 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-21 17:00:34,707 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-21 17:00:34,707 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-21 17:00:34,708 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-21 17:00:34,708 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-21 17:00:34,708 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-21 17:00:34,708 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-21 17:00:34,708 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-21 17:00:34,709 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-21 17:00:34,709 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-21 17:00:34,709 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-21 17:00:34,709 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-21 17:00:34,709 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-21 17:00:34,710 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-21 17:00:34,710 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-21 17:00:34,710 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-21 17:00:34,710 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-21 17:00:34,710 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-21 17:00:34,711 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-21 17:00:34,711 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:34,711 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-21 17:00:34,711 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-21 17:00:34,711 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2
[2020-07-21 17:00:35,005 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-21 17:00:35,026 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-21 17:00:35,030 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-21 17:00:35,031 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-21 17:00:35,031 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-21 17:00:35,032 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-21 17:00:35,094 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bba8f39a9/e293152920ad4866bf2705de59878ce9/FLAG6fc722fce
[2020-07-21 17:00:35,493 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-21 17:00:35,493 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_1.i
[2020-07-21 17:00:35,499 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bba8f39a9/e293152920ad4866bf2705de59878ce9/FLAG6fc722fce
[2020-07-21 17:00:35,930 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bba8f39a9/e293152920ad4866bf2705de59878ce9
[2020-07-21 17:00:35,941 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-21 17:00:35,944 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-21 17:00:35,945 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-21 17:00:35,945 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-21 17:00:35,950 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-21 17:00:35,951 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:00:35" (1/1) ...
[2020-07-21 17:00:35,954 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@458b7631 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:35, skipping insertion in model container
[2020-07-21 17:00:35,954 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 05:00:35" (1/1) ...
[2020-07-21 17:00:35,962 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-21 17:00:35,977 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-21 17:00:36,130 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 17:00:36,135 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-21 17:00:36,150 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-21 17:00:36,165 INFO  L208         MainTranslator]: Completed translation
[2020-07-21 17:00:36,166 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36 WrapperNode
[2020-07-21 17:00:36,166 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-21 17:00:36,166 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-21 17:00:36,167 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-21 17:00:36,167 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-21 17:00:36,178 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,178 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,183 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,184 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,187 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,193 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,194 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (1/1) ...
[2020-07-21 17:00:36,285 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-21 17:00:36,285 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-21 17:00:36,285 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-21 17:00:36,286 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-21 17:00:36,287 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (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 17:00:36,351 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-21 17:00:36,351 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-21 17:00:36,352 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-07-21 17:00:36,352 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-07-21 17:00:36,352 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-21 17:00:36,352 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-21 17:00:36,352 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-07-21 17:00:36,352 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-07-21 17:00:36,353 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-07-21 17:00:36,353 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-21 17:00:36,353 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-21 17:00:36,353 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-21 17:00:36,353 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-21 17:00:36,515 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-21 17:00:36,516 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-07-21 17:00:36,520 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:00:36 BoogieIcfgContainer
[2020-07-21 17:00:36,520 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-21 17:00:36,521 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-21 17:00:36,522 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-21 17:00:36,525 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-21 17:00:36,525 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 05:00:35" (1/3) ...
[2020-07-21 17:00:36,526 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fa109bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:00:36, skipping insertion in model container
[2020-07-21 17:00:36,526 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 05:00:36" (2/3) ...
[2020-07-21 17:00:36,527 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fa109bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 05:00:36, skipping insertion in model container
[2020-07-21 17:00:36,527 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 05:00:36" (3/3) ...
[2020-07-21 17:00:36,528 INFO  L109   eAbstractionObserver]: Analyzing ICFG count_by_1.i
[2020-07-21 17:00:36,539 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-21 17:00:36,547 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-21 17:00:36,564 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-21 17:00:36,590 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-21 17:00:36,591 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-21 17:00:36,591 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-21 17:00:36,591 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-21 17:00:36,591 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-21 17:00:36,591 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-21 17:00:36,592 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-21 17:00:36,592 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-21 17:00:36,619 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states.
[2020-07-21 17:00:36,627 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2020-07-21 17:00:36,627 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:36,629 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:36,629 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:36,637 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:36,638 INFO  L82        PathProgramCache]: Analyzing trace with hash 650151859, now seen corresponding path program 1 times
[2020-07-21 17:00:36,649 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:36,650 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162242195]
[2020-07-21 17:00:36,650 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 17:00:36,768 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:36,768 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:36,773 INFO  L263         TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 2 conjunts are in the unsatisfiable core
[2020-07-21 17:00:36,786 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:36,850 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 17:00:36,851 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 17:00:36,852 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162242195]
[2020-07-21 17:00:36,852 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 17:00:36,853 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-07-21 17:00:36,854 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558251980]
[2020-07-21 17:00:36,859 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-07-21 17:00:36,859 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:36,874 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-07-21 17:00:36,875 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-21 17:00:36,878 INFO  L87              Difference]: Start difference. First operand 19 states. Second operand 3 states.
[2020-07-21 17:00:36,917 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:36,918 INFO  L93              Difference]: Finished difference Result 33 states and 38 transitions.
[2020-07-21 17:00:36,918 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-07-21 17:00:36,920 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 10
[2020-07-21 17:00:36,920 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:36,928 INFO  L225             Difference]: With dead ends: 33
[2020-07-21 17:00:36,928 INFO  L226             Difference]: Without dead ends: 14
[2020-07-21 17:00:36,932 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-07-21 17:00:36,950 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2020-07-21 17:00:36,967 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13.
[2020-07-21 17:00:36,968 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 13 states.
[2020-07-21 17:00:36,969 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions.
[2020-07-21 17:00:36,971 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10
[2020-07-21 17:00:36,971 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:36,972 INFO  L479      AbstractCegarLoop]: Abstraction has 13 states and 13 transitions.
[2020-07-21 17:00:36,972 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-07-21 17:00:36,972 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions.
[2020-07-21 17:00:36,973 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-07-21 17:00:36,973 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:36,973 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:37,188 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:37,189 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:37,189 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:37,190 INFO  L82        PathProgramCache]: Analyzing trace with hash -1133927695, now seen corresponding path program 1 times
[2020-07-21 17:00:37,190 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:37,191 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99375915]
[2020-07-21 17:00:37,192 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 17:00:37,218 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:37,219 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:37,220 INFO  L263         TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 3 conjunts are in the unsatisfiable core
[2020-07-21 17:00:37,221 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:37,253 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:37,253 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:00:37,296 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:37,297 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99375915]
[2020-07-21 17:00:37,297 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:00:37,298 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6
[2020-07-21 17:00:37,298 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108839153]
[2020-07-21 17:00:37,300 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-07-21 17:00:37,300 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:37,301 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-07-21 17:00:37,301 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-21 17:00:37,302 INFO  L87              Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states.
[2020-07-21 17:00:37,344 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:37,344 INFO  L93              Difference]: Finished difference Result 24 states and 26 transitions.
[2020-07-21 17:00:37,345 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-07-21 17:00:37,345 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 12
[2020-07-21 17:00:37,346 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:37,346 INFO  L225             Difference]: With dead ends: 24
[2020-07-21 17:00:37,347 INFO  L226             Difference]: Without dead ends: 19
[2020-07-21 17:00:37,348 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30
[2020-07-21 17:00:37,348 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-07-21 17:00:37,352 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-07-21 17:00:37,353 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-07-21 17:00:37,353 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions.
[2020-07-21 17:00:37,354 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12
[2020-07-21 17:00:37,354 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:37,354 INFO  L479      AbstractCegarLoop]: Abstraction has 19 states and 19 transitions.
[2020-07-21 17:00:37,355 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-07-21 17:00:37,355 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions.
[2020-07-21 17:00:37,356 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-07-21 17:00:37,356 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:37,356 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:37,558 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:37,559 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:37,560 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:37,560 INFO  L82        PathProgramCache]: Analyzing trace with hash -1338939477, now seen corresponding path program 2 times
[2020-07-21 17:00:37,561 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:37,561 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14624863]
[2020-07-21 17:00:37,562 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 17:00:37,593 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:37,594 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:37,595 INFO  L263         TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-21 17:00:37,598 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:37,684 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:37,685 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:00:37,781 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:37,781 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14624863]
[2020-07-21 17:00:37,782 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:00:37,782 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12
[2020-07-21 17:00:37,782 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470973352]
[2020-07-21 17:00:37,783 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-07-21 17:00:37,783 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:37,784 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-07-21 17:00:37,784 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-21 17:00:37,784 INFO  L87              Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 12 states.
[2020-07-21 17:00:37,841 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:37,841 INFO  L93              Difference]: Finished difference Result 36 states and 41 transitions.
[2020-07-21 17:00:37,842 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-07-21 17:00:37,842 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 18
[2020-07-21 17:00:37,842 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:37,843 INFO  L225             Difference]: With dead ends: 36
[2020-07-21 17:00:37,843 INFO  L226             Difference]: Without dead ends: 31
[2020-07-21 17:00:37,844 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132
[2020-07-21 17:00:37,845 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-07-21 17:00:37,850 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31.
[2020-07-21 17:00:37,851 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-07-21 17:00:37,852 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions.
[2020-07-21 17:00:37,852 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 18
[2020-07-21 17:00:37,852 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:37,853 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 31 transitions.
[2020-07-21 17:00:37,853 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-07-21 17:00:37,853 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions.
[2020-07-21 17:00:37,854 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-07-21 17:00:37,854 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:37,855 INFO  L422         BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:38,055 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:38,056 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:38,057 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:38,057 INFO  L82        PathProgramCache]: Analyzing trace with hash 1154594463, now seen corresponding path program 3 times
[2020-07-21 17:00:38,058 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:38,058 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939744151]
[2020-07-21 17:00:38,058 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 17:00:38,092 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:38,092 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:38,093 INFO  L263         TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-21 17:00:38,096 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:38,268 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:38,269 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:00:38,532 INFO  L134       CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:38,532 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939744151]
[2020-07-21 17:00:38,533 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:00:38,533 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24
[2020-07-21 17:00:38,533 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930239924]
[2020-07-21 17:00:38,534 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 24 states
[2020-07-21 17:00:38,534 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:38,535 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2020-07-21 17:00:38,535 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-21 17:00:38,536 INFO  L87              Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 24 states.
[2020-07-21 17:00:38,634 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:38,635 INFO  L93              Difference]: Finished difference Result 60 states and 71 transitions.
[2020-07-21 17:00:38,635 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2020-07-21 17:00:38,635 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 30
[2020-07-21 17:00:38,636 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:38,637 INFO  L225             Difference]: With dead ends: 60
[2020-07-21 17:00:38,637 INFO  L226             Difference]: Without dead ends: 55
[2020-07-21 17:00:38,638 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552
[2020-07-21 17:00:38,639 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2020-07-21 17:00:38,646 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55.
[2020-07-21 17:00:38,646 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 55 states.
[2020-07-21 17:00:38,647 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions.
[2020-07-21 17:00:38,648 INFO  L78                 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 30
[2020-07-21 17:00:38,648 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:38,648 INFO  L479      AbstractCegarLoop]: Abstraction has 55 states and 55 transitions.
[2020-07-21 17:00:38,648 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2020-07-21 17:00:38,649 INFO  L276                IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions.
[2020-07-21 17:00:38,650 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 55
[2020-07-21 17:00:38,650 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:38,650 INFO  L422         BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:38,864 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:38,865 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:38,865 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:38,866 INFO  L82        PathProgramCache]: Analyzing trace with hash -1804670329, now seen corresponding path program 4 times
[2020-07-21 17:00:38,866 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:38,867 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918564987]
[2020-07-21 17:00:38,867 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 17:00:38,905 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:38,905 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:38,907 INFO  L263         TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 24 conjunts are in the unsatisfiable core
[2020-07-21 17:00:38,910 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:39,350 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:39,351 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:00:40,330 INFO  L134       CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:40,330 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918564987]
[2020-07-21 17:00:40,331 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:00:40,331 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48
[2020-07-21 17:00:40,331 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550866547]
[2020-07-21 17:00:40,332 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 48 states
[2020-07-21 17:00:40,332 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:40,333 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants.
[2020-07-21 17:00:40,334 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-21 17:00:40,335 INFO  L87              Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 48 states.
[2020-07-21 17:00:40,528 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:40,529 INFO  L93              Difference]: Finished difference Result 108 states and 131 transitions.
[2020-07-21 17:00:40,529 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. 
[2020-07-21 17:00:40,529 INFO  L78                 Accepts]: Start accepts. Automaton has 48 states. Word has length 54
[2020-07-21 17:00:40,530 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:40,532 INFO  L225             Difference]: With dead ends: 108
[2020-07-21 17:00:40,532 INFO  L226             Difference]: Without dead ends: 103
[2020-07-21 17:00:40,534 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256
[2020-07-21 17:00:40,534 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 103 states.
[2020-07-21 17:00:40,544 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103.
[2020-07-21 17:00:40,545 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 103 states.
[2020-07-21 17:00:40,547 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions.
[2020-07-21 17:00:40,547 INFO  L78                 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 54
[2020-07-21 17:00:40,548 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:40,548 INFO  L479      AbstractCegarLoop]: Abstraction has 103 states and 103 transitions.
[2020-07-21 17:00:40,548 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 48 states.
[2020-07-21 17:00:40,548 INFO  L276                IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions.
[2020-07-21 17:00:40,551 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 103
[2020-07-21 17:00:40,551 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:40,551 INFO  L422         BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:40,764 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:40,765 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:40,765 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:40,765 INFO  L82        PathProgramCache]: Analyzing trace with hash 1210559063, now seen corresponding path program 5 times
[2020-07-21 17:00:40,766 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:40,766 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187545474]
[2020-07-21 17:00:40,766 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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
[2020-07-21 17:00:40,815 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:40,815 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:40,817 INFO  L263         TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 48 conjunts are in the unsatisfiable core
[2020-07-21 17:00:40,822 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:42,095 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:42,095 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:00:45,717 INFO  L134       CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:45,718 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187545474]
[2020-07-21 17:00:45,718 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:00:45,718 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96
[2020-07-21 17:00:45,732 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207945301]
[2020-07-21 17:00:45,733 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 96 states
[2020-07-21 17:00:45,734 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:00:45,736 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants.
[2020-07-21 17:00:45,742 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-21 17:00:45,742 INFO  L87              Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 96 states.
[2020-07-21 17:00:46,363 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:00:46,363 INFO  L93              Difference]: Finished difference Result 204 states and 251 transitions.
[2020-07-21 17:00:46,364 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. 
[2020-07-21 17:00:46,364 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states. Word has length 102
[2020-07-21 17:00:46,365 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:00:46,367 INFO  L225             Difference]: With dead ends: 204
[2020-07-21 17:00:46,367 INFO  L226             Difference]: Without dead ends: 199
[2020-07-21 17:00:46,371 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120
[2020-07-21 17:00:46,372 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 199 states.
[2020-07-21 17:00:46,387 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199.
[2020-07-21 17:00:46,387 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 199 states.
[2020-07-21 17:00:46,390 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 199 transitions.
[2020-07-21 17:00:46,390 INFO  L78                 Accepts]: Start accepts. Automaton has 199 states and 199 transitions. Word has length 102
[2020-07-21 17:00:46,390 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:00:46,391 INFO  L479      AbstractCegarLoop]: Abstraction has 199 states and 199 transitions.
[2020-07-21 17:00:46,391 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 96 states.
[2020-07-21 17:00:46,391 INFO  L276                IsEmpty]: Start isEmpty. Operand 199 states and 199 transitions.
[2020-07-21 17:00:46,394 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 199
[2020-07-21 17:00:46,394 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:00:46,394 INFO  L422         BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:00:46,608 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:46,610 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:00:46,610 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:00:46,611 INFO  L82        PathProgramCache]: Analyzing trace with hash 2113047031, now seen corresponding path program 6 times
[2020-07-21 17:00:46,611 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:00:46,612 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42043950]
[2020-07-21 17:00:46,612 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:00:46,705 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:00:46,706 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:00:46,711 INFO  L263         TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 96 conjunts are in the unsatisfiable core
[2020-07-21 17:00:46,737 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:00:51,464 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:00:51,464 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:01:05,580 INFO  L134       CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:01:05,581 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42043950]
[2020-07-21 17:01:05,581 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:01:05,581 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192
[2020-07-21 17:01:05,581 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481200958]
[2020-07-21 17:01:05,582 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 192 states
[2020-07-21 17:01:05,583 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:01:05,586 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants.
[2020-07-21 17:01:05,595 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-21 17:01:05,595 INFO  L87              Difference]: Start difference. First operand 199 states and 199 transitions. Second operand 192 states.
[2020-07-21 17:01:06,712 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:01:06,712 INFO  L93              Difference]: Finished difference Result 396 states and 491 transitions.
[2020-07-21 17:01:06,713 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. 
[2020-07-21 17:01:06,713 INFO  L78                 Accepts]: Start accepts. Automaton has 192 states. Word has length 198
[2020-07-21 17:01:06,715 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:01:06,718 INFO  L225             Difference]: With dead ends: 396
[2020-07-21 17:01:06,718 INFO  L226             Difference]: Without dead ends: 391
[2020-07-21 17:01:06,721 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672
[2020-07-21 17:01:06,722 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 391 states.
[2020-07-21 17:01:06,743 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 391.
[2020-07-21 17:01:06,743 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 391 states.
[2020-07-21 17:01:06,748 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 391 transitions.
[2020-07-21 17:01:06,748 INFO  L78                 Accepts]: Start accepts. Automaton has 391 states and 391 transitions. Word has length 198
[2020-07-21 17:01:06,749 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:01:06,749 INFO  L479      AbstractCegarLoop]: Abstraction has 391 states and 391 transitions.
[2020-07-21 17:01:06,749 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 192 states.
[2020-07-21 17:01:06,749 INFO  L276                IsEmpty]: Start isEmpty. Operand 391 states and 391 transitions.
[2020-07-21 17:01:06,756 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 391
[2020-07-21 17:01:06,756 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:01:06,756 INFO  L422         BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:01:06,970 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:01:06,971 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:01:06,971 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:01:06,971 INFO  L82        PathProgramCache]: Analyzing trace with hash 1173211447, now seen corresponding path program 7 times
[2020-07-21 17:01:06,972 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:01:06,972 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789961359]
[2020-07-21 17:01:06,973 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:01:07,109 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:01:07,110 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:01:07,124 INFO  L263         TraceCheckSpWp]: Trace formula consists of 592 conjuncts, 192 conjunts are in the unsatisfiable core
[2020-07-21 17:01:07,133 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:01:26,317 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:01:26,318 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:02:28,788 INFO  L134       CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:02:28,788 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789961359]
[2020-07-21 17:02:28,788 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:02:28,789 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384
[2020-07-21 17:02:28,789 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433661981]
[2020-07-21 17:02:28,790 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 384 states
[2020-07-21 17:02:28,790 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:02:28,806 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants.
[2020-07-21 17:02:28,816 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-21 17:02:28,817 INFO  L87              Difference]: Start difference. First operand 391 states and 391 transitions. Second operand 384 states.
[2020-07-21 17:02:33,928 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:02:33,928 INFO  L93              Difference]: Finished difference Result 780 states and 971 transitions.
[2020-07-21 17:02:33,931 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. 
[2020-07-21 17:02:33,932 INFO  L78                 Accepts]: Start accepts. Automaton has 384 states. Word has length 390
[2020-07-21 17:02:33,932 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:02:33,936 INFO  L225             Difference]: With dead ends: 780
[2020-07-21 17:02:33,936 INFO  L226             Difference]: Without dead ends: 775
[2020-07-21 17:02:33,942 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 779 GetRequests, 397 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 81.1s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072
[2020-07-21 17:02:33,944 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 775 states.
[2020-07-21 17:02:33,968 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 775.
[2020-07-21 17:02:33,969 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 775 states.
[2020-07-21 17:02:33,975 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 775 transitions.
[2020-07-21 17:02:33,975 INFO  L78                 Accepts]: Start accepts. Automaton has 775 states and 775 transitions. Word has length 390
[2020-07-21 17:02:33,980 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:02:33,980 INFO  L479      AbstractCegarLoop]: Abstraction has 775 states and 775 transitions.
[2020-07-21 17:02:33,980 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 384 states.
[2020-07-21 17:02:33,980 INFO  L276                IsEmpty]: Start isEmpty. Operand 775 states and 775 transitions.
[2020-07-21 17:02:34,014 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 775
[2020-07-21 17:02:34,014 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:02:34,015 INFO  L422         BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:02:34,229 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:02:34,230 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:02:34,230 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:02:34,231 INFO  L82        PathProgramCache]: Analyzing trace with hash 1601849271, now seen corresponding path program 8 times
[2020-07-21 17:02:34,231 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:02:34,232 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328667189]
[2020-07-21 17:02:34,232 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:02:34,532 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:02:34,533 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:02:34,591 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1168 conjuncts, 384 conjunts are in the unsatisfiable core
[2020-07-21 17:02:34,605 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 17:04:06,151 INFO  L134       CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:04:06,152 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 17:10:51,242 INFO  L134       CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 17:10:51,243 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328667189]
[2020-07-21 17:10:51,243 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 17:10:51,252 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385] total 768
[2020-07-21 17:10:51,253 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998800791]
[2020-07-21 17:10:51,255 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 768 states
[2020-07-21 17:10:51,256 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 17:10:51,298 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 768 interpolants.
[2020-07-21 17:10:51,316 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056
[2020-07-21 17:10:51,316 INFO  L87              Difference]: Start difference. First operand 775 states and 775 transitions. Second operand 768 states.
[2020-07-21 17:12:05,588 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 17:12:05,589 INFO  L93              Difference]: Finished difference Result 1548 states and 1931 transitions.
[2020-07-21 17:12:05,593 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. 
[2020-07-21 17:12:05,593 INFO  L78                 Accepts]: Start accepts. Automaton has 768 states. Word has length 774
[2020-07-21 17:12:05,595 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 17:12:05,602 INFO  L225             Difference]: With dead ends: 1548
[2020-07-21 17:12:05,603 INFO  L226             Difference]: Without dead ends: 1543
[2020-07-21 17:12:05,632 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 1547 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 766 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 495.2s TimeCoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056
[2020-07-21 17:12:05,634 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 1543 states.
[2020-07-21 17:12:05,665 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 1543 to 1543.
[2020-07-21 17:12:05,665 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 1543 states.
[2020-07-21 17:12:05,672 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 1543 states to 1543 states and 1543 transitions.
[2020-07-21 17:12:05,672 INFO  L78                 Accepts]: Start accepts. Automaton has 1543 states and 1543 transitions. Word has length 774
[2020-07-21 17:12:05,675 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-21 17:12:05,675 INFO  L479      AbstractCegarLoop]: Abstraction has 1543 states and 1543 transitions.
[2020-07-21 17:12:05,675 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 768 states.
[2020-07-21 17:12:05,675 INFO  L276                IsEmpty]: Start isEmpty. Operand 1543 states and 1543 transitions.
[2020-07-21 17:12:05,715 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 1543
[2020-07-21 17:12:05,715 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-21 17:12:05,716 INFO  L422         BasicCegarLoop]: trace histogram [766, 766, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-21 17:12:05,916 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:12:05,917 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 17:12:05,918 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 17:12:05,919 INFO  L82        PathProgramCache]: Analyzing trace with hash 2028684471, now seen corresponding path program 9 times
[2020-07-21 17:12:05,919 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 17:12:05,920 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1985991758]
[2020-07-21 17:12:05,920 INFO  L95    rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 17:12:06,861 INFO  L228   tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s)
[2020-07-21 17:12:06,861 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 17:12:07,301 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2320 conjuncts, 768 conjunts are in the unsatisfiable core
[2020-07-21 17:12:07,328 INFO  L286         TraceCheckSpWp]: Computing forward predicates...