/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c


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


This is Ultimate 0.1.25-c90d42b
[2020-09-24 15:07:58,083 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-09-24 15:07:58,088 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-09-24 15:07:58,136 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-09-24 15:07:58,136 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-09-24 15:07:58,147 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-09-24 15:07:58,149 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-09-24 15:07:58,164 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-09-24 15:07:58,164 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-09-24 15:07:58,167 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-09-24 15:07:58,170 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-09-24 15:07:58,173 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-09-24 15:07:58,175 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-09-24 15:07:58,176 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-09-24 15:07:58,179 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-09-24 15:07:58,188 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-09-24 15:07:58,191 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-09-24 15:07:58,192 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-09-24 15:07:58,193 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-09-24 15:07:58,194 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-09-24 15:07:58,197 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-09-24 15:07:58,198 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-09-24 15:07:58,198 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-09-24 15:07:58,201 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
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[2020-09-24 15:07:58,204 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
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[2020-09-24 15:07:58,209 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-09-24 15:07:58,209 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
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[2020-09-24 15:07:58,210 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-09-24 15:07:58,213 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-09-24 15:07:58,214 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-09-24 15:07:58,262 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-09-24 15:07:58,263 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-09-24 15:07:58,265 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-09-24 15:07:58,265 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-09-24 15:07:58,266 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-09-24 15:07:58,266 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-09-24 15:07:58,266 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-09-24 15:07:58,267 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-09-24 15:07:58,267 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-09-24 15:07:58,267 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-09-24 15:07:58,268 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-09-24 15:07:58,269 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-09-24 15:07:58,269 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-09-24 15:07:58,269 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-09-24 15:07:58,270 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-09-24 15:07:58,270 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-09-24 15:07:58,270 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-09-24 15:07:58,270 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-09-24 15:07:58,271 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-09-24 15:07:58,271 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-09-24 15:07:58,271 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-09-24 15:07:58,271 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-09-24 15:07:58,271 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-09-24 15:07:58,272 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-09-24 15:07:58,272 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-09-24 15:07:58,272 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-09-24 15:07:58,272 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-09-24 15:07:58,273 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-09-24 15:07:58,273 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-09-24 15:07:58,273 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 -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false
[2020-09-24 15:07:58,785 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-09-24 15:07:58,804 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-09-24 15:07:58,808 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-09-24 15:07:58,810 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-09-24 15:07:58,811 INFO  L275        PluginConnector]: CDTParser initialized
[2020-09-24 15:07:58,812 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c
[2020-09-24 15:07:58,887 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb7fd091e/3d301e38cc5e490dad2217e338f2b9fa/FLAGef903c4f7
[2020-09-24 15:07:59,359 INFO  L306              CDTParser]: Found 1 translation units.
[2020-09-24 15:07:59,359 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c
[2020-09-24 15:07:59,367 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb7fd091e/3d301e38cc5e490dad2217e338f2b9fa/FLAGef903c4f7
[2020-09-24 15:07:59,714 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb7fd091e/3d301e38cc5e490dad2217e338f2b9fa
[2020-09-24 15:07:59,729 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-09-24 15:07:59,738 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-09-24 15:07:59,742 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-09-24 15:07:59,742 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-09-24 15:07:59,746 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-09-24 15:07:59,747 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:07:59" (1/1) ...
[2020-09-24 15:07:59,752 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7702166d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:59, skipping insertion in model container
[2020-09-24 15:07:59,752 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:07:59" (1/1) ...
[2020-09-24 15:07:59,762 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-09-24 15:07:59,788 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-09-24 15:08:00,005 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 15:08:00,010 INFO  L203         MainTranslator]: Completed pre-run
[2020-09-24 15:08:00,028 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-09-24 15:08:00,046 INFO  L208         MainTranslator]: Completed translation
[2020-09-24 15:08:00,046 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00 WrapperNode
[2020-09-24 15:08:00,046 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-09-24 15:08:00,047 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-09-24 15:08:00,048 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-09-24 15:08:00,048 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-09-24 15:08:00,065 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,065 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,072 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,072 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,076 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,083 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,084 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
[2020-09-24 15:08:00,163 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-09-24 15:08:00,164 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-09-24 15:08:00,166 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-09-24 15:08:00,167 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-09-24 15:08:00,168 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/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
[2020-09-24 15:08:00,246 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-09-24 15:08:00,247 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-09-24 15:08:00,247 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-09-24 15:08:00,247 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-09-24 15:08:00,247 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-09-24 15:08:00,247 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-09-24 15:08:00,247 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-09-24 15:08:00,248 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-09-24 15:08:00,248 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-09-24 15:08:00,449 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-09-24 15:08:00,449 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-09-24 15:08:00,454 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:08:00 BoogieIcfgContainer
[2020-09-24 15:08:00,454 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-09-24 15:08:00,455 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-09-24 15:08:00,456 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-09-24 15:08:00,459 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-09-24 15:08:00,459 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 03:07:59" (1/3) ...
[2020-09-24 15:08:00,460 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@815ad88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:08:00, skipping insertion in model container
[2020-09-24 15:08:00,460 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:08:00" (2/3) ...
[2020-09-24 15:08:00,461 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@815ad88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:08:00, skipping insertion in model container
[2020-09-24 15:08:00,461 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:08:00" (3/3) ...
[2020-09-24 15:08:00,464 INFO  L109   eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c
[2020-09-24 15:08:00,473 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-09-24 15:08:00,483 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-09-24 15:08:00,505 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-09-24 15:08:00,537 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-09-24 15:08:00,537 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-09-24 15:08:00,538 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-09-24 15:08:00,538 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-09-24 15:08:00,538 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-09-24 15:08:00,538 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-09-24 15:08:00,538 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-09-24 15:08:00,538 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-09-24 15:08:00,557 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states.
[2020-09-24 15:08:00,564 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2020-09-24 15:08:00,564 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:00,565 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:00,565 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:00,573 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:00,574 INFO  L82        PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times
[2020-09-24 15:08:00,585 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:00,586 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550337900]
[2020-09-24 15:08:00,586 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:00,673 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:00,705 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:00,706 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:00,712 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:00,713 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550337900]
[2020-09-24 15:08:00,716 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 15:08:00,716 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2020-09-24 15:08:00,717 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125535714]
[2020-09-24 15:08:00,725 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 2 states
[2020-09-24 15:08:00,725 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:00,742 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2020-09-24 15:08:00,744 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-09-24 15:08:00,746 INFO  L87              Difference]: Start difference. First operand 22 states. Second operand 2 states.
[2020-09-24 15:08:00,773 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:00,773 INFO  L93              Difference]: Finished difference Result 33 states and 36 transitions.
[2020-09-24 15:08:00,774 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2020-09-24 15:08:00,775 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 11
[2020-09-24 15:08:00,776 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:00,786 INFO  L225             Difference]: With dead ends: 33
[2020-09-24 15:08:00,786 INFO  L226             Difference]: Without dead ends: 16
[2020-09-24 15:08:00,790 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2020-09-24 15:08:00,810 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16 states.
[2020-09-24 15:08:00,829 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16.
[2020-09-24 15:08:00,831 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16 states.
[2020-09-24 15:08:00,831 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions.
[2020-09-24 15:08:00,833 INFO  L78                 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11
[2020-09-24 15:08:00,833 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:00,834 INFO  L479      AbstractCegarLoop]: Abstraction has 16 states and 16 transitions.
[2020-09-24 15:08:00,834 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2020-09-24 15:08:00,834 INFO  L276                IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions.
[2020-09-24 15:08:00,835 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2020-09-24 15:08:00,835 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:00,835 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:00,835 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-09-24 15:08:00,836 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:00,836 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:00,836 INFO  L82        PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times
[2020-09-24 15:08:00,836 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:00,837 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1561572015]
[2020-09-24 15:08:00,837 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:00,866 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:00,954 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:00,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:00,959 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:00,960 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1561572015]
[2020-09-24 15:08:00,960 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-09-24 15:08:00,960 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-09-24 15:08:00,960 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867842962]
[2020-09-24 15:08:00,962 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-09-24 15:08:00,963 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:00,963 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-09-24 15:08:00,964 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-09-24 15:08:00,964 INFO  L87              Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states.
[2020-09-24 15:08:00,993 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:00,993 INFO  L93              Difference]: Finished difference Result 24 states and 24 transitions.
[2020-09-24 15:08:00,994 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-09-24 15:08:00,994 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 11
[2020-09-24 15:08:00,995 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:00,996 INFO  L225             Difference]: With dead ends: 24
[2020-09-24 15:08:00,996 INFO  L226             Difference]: Without dead ends: 19
[2020-09-24 15:08:00,997 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-09-24 15:08:00,998 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-09-24 15:08:01,002 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17.
[2020-09-24 15:08:01,003 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 17 states.
[2020-09-24 15:08:01,004 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions.
[2020-09-24 15:08:01,004 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11
[2020-09-24 15:08:01,005 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:01,005 INFO  L479      AbstractCegarLoop]: Abstraction has 17 states and 17 transitions.
[2020-09-24 15:08:01,005 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-09-24 15:08:01,005 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions.
[2020-09-24 15:08:01,006 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2020-09-24 15:08:01,006 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:01,006 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:01,007 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-09-24 15:08:01,007 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:01,008 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:01,008 INFO  L82        PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times
[2020-09-24 15:08:01,008 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,009 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510670822]
[2020-09-24 15:08:01,009 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:01,031 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,243 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:01,245 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,250 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:01,251 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510670822]
[2020-09-24 15:08:01,251 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 15:08:01,251 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6
[2020-09-24 15:08:01,252 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163506282]
[2020-09-24 15:08:01,252 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-09-24 15:08:01,253 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,253 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-09-24 15:08:01,254 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30
[2020-09-24 15:08:01,254 INFO  L87              Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states.
[2020-09-24 15:08:01,305 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:01,305 INFO  L93              Difference]: Finished difference Result 31 states and 31 transitions.
[2020-09-24 15:08:01,306 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-09-24 15:08:01,306 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 16
[2020-09-24 15:08:01,306 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:01,307 INFO  L225             Difference]: With dead ends: 31
[2020-09-24 15:08:01,307 INFO  L226             Difference]: Without dead ends: 26
[2020-09-24 15:08:01,308 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42
[2020-09-24 15:08:01,309 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 26 states.
[2020-09-24 15:08:01,313 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22.
[2020-09-24 15:08:01,314 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22 states.
[2020-09-24 15:08:01,315 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions.
[2020-09-24 15:08:01,315 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16
[2020-09-24 15:08:01,315 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:01,315 INFO  L479      AbstractCegarLoop]: Abstraction has 22 states and 22 transitions.
[2020-09-24 15:08:01,316 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-09-24 15:08:01,316 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions.
[2020-09-24 15:08:01,317 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2020-09-24 15:08:01,317 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:01,317 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:01,317 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-09-24 15:08:01,318 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:01,318 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:01,318 INFO  L82        PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times
[2020-09-24 15:08:01,318 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,319 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227042089]
[2020-09-24 15:08:01,319 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:01,341 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,502 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:01,503 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,508 INFO  L134       CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:01,508 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227042089]
[2020-09-24 15:08:01,508 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 15:08:01,509 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2020-09-24 15:08:01,509 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777764174]
[2020-09-24 15:08:01,509 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-09-24 15:08:01,510 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,510 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-09-24 15:08:01,510 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2020-09-24 15:08:01,510 INFO  L87              Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 7 states.
[2020-09-24 15:08:01,556 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:01,556 INFO  L93              Difference]: Finished difference Result 36 states and 36 transitions.
[2020-09-24 15:08:01,557 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-09-24 15:08:01,557 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 21
[2020-09-24 15:08:01,557 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:01,558 INFO  L225             Difference]: With dead ends: 36
[2020-09-24 15:08:01,558 INFO  L226             Difference]: Without dead ends: 31
[2020-09-24 15:08:01,559 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2020-09-24 15:08:01,560 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-09-24 15:08:01,564 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27.
[2020-09-24 15:08:01,565 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 27 states.
[2020-09-24 15:08:01,566 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions.
[2020-09-24 15:08:01,566 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21
[2020-09-24 15:08:01,566 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:01,567 INFO  L479      AbstractCegarLoop]: Abstraction has 27 states and 27 transitions.
[2020-09-24 15:08:01,567 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-09-24 15:08:01,567 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions.
[2020-09-24 15:08:01,568 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-09-24 15:08:01,568 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:01,568 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:01,568 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-09-24 15:08:01,569 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:01,569 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:01,569 INFO  L82        PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times
[2020-09-24 15:08:01,569 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,570 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879211412]
[2020-09-24 15:08:01,570 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:01,605 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,796 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:01,797 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:01,802 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:01,803 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879211412]
[2020-09-24 15:08:01,803 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 15:08:01,804 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-09-24 15:08:01,804 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371659835]
[2020-09-24 15:08:01,804 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-09-24 15:08:01,805 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:01,805 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-09-24 15:08:01,805 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2020-09-24 15:08:01,806 INFO  L87              Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states.
[2020-09-24 15:08:02,017 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:02,018 INFO  L93              Difference]: Finished difference Result 39 states and 39 transitions.
[2020-09-24 15:08:02,021 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-09-24 15:08:02,021 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 26
[2020-09-24 15:08:02,022 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:02,023 INFO  L225             Difference]: With dead ends: 39
[2020-09-24 15:08:02,023 INFO  L226             Difference]: Without dead ends: 34
[2020-09-24 15:08:02,025 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210
[2020-09-24 15:08:02,028 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2020-09-24 15:08:02,037 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32.
[2020-09-24 15:08:02,037 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 32 states.
[2020-09-24 15:08:02,038 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions.
[2020-09-24 15:08:02,039 INFO  L78                 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26
[2020-09-24 15:08:02,039 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:02,039 INFO  L479      AbstractCegarLoop]: Abstraction has 32 states and 32 transitions.
[2020-09-24 15:08:02,039 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-09-24 15:08:02,040 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions.
[2020-09-24 15:08:02,040 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-09-24 15:08:02,042 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:02,042 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:02,042 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-09-24 15:08:02,043 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:02,044 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:02,044 INFO  L82        PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times
[2020-09-24 15:08:02,044 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:02,044 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941727579]
[2020-09-24 15:08:02,045 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:02,076 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:02,249 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:02,250 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:02,254 INFO  L134       CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:02,255 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941727579]
[2020-09-24 15:08:02,255 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 15:08:02,255 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2020-09-24 15:08:02,256 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131553413]
[2020-09-24 15:08:02,256 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-09-24 15:08:02,256 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:02,257 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-09-24 15:08:02,257 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110
[2020-09-24 15:08:02,257 INFO  L87              Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states.
[2020-09-24 15:08:02,499 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:02,499 INFO  L93              Difference]: Finished difference Result 44 states and 44 transitions.
[2020-09-24 15:08:02,500 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-09-24 15:08:02,500 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 31
[2020-09-24 15:08:02,500 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:02,501 INFO  L225             Difference]: With dead ends: 44
[2020-09-24 15:08:02,501 INFO  L226             Difference]: Without dead ends: 39
[2020-09-24 15:08:02,502 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342
[2020-09-24 15:08:02,502 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 39 states.
[2020-09-24 15:08:02,510 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37.
[2020-09-24 15:08:02,510 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 37 states.
[2020-09-24 15:08:02,513 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions.
[2020-09-24 15:08:02,514 INFO  L78                 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31
[2020-09-24 15:08:02,514 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:02,514 INFO  L479      AbstractCegarLoop]: Abstraction has 37 states and 37 transitions.
[2020-09-24 15:08:02,514 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-09-24 15:08:02,514 INFO  L276                IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions.
[2020-09-24 15:08:02,515 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 37
[2020-09-24 15:08:02,515 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:02,516 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:02,516 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-09-24 15:08:02,516 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:02,516 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:02,517 INFO  L82        PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times
[2020-09-24 15:08:02,517 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:02,517 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588709902]
[2020-09-24 15:08:02,517 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:02,536 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:02,732 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-09-24 15:08:02,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-09-24 15:08:02,742 INFO  L134       CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-09-24 15:08:02,742 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588709902]
[2020-09-24 15:08:02,743 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-09-24 15:08:02,743 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13
[2020-09-24 15:08:02,743 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746657542]
[2020-09-24 15:08:02,745 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-09-24 15:08:02,745 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-09-24 15:08:02,746 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-09-24 15:08:02,746 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156
[2020-09-24 15:08:02,747 INFO  L87              Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states.
[2020-09-24 15:08:03,070 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-09-24 15:08:03,070 INFO  L93              Difference]: Finished difference Result 49 states and 49 transitions.
[2020-09-24 15:08:03,071 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. 
[2020-09-24 15:08:03,071 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 36
[2020-09-24 15:08:03,071 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-09-24 15:08:03,072 INFO  L225             Difference]: With dead ends: 49
[2020-09-24 15:08:03,072 INFO  L226             Difference]: Without dead ends: 44
[2020-09-24 15:08:03,073 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506
[2020-09-24 15:08:03,074 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 44 states.
[2020-09-24 15:08:03,078 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42.
[2020-09-24 15:08:03,079 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 42 states.
[2020-09-24 15:08:03,080 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions.
[2020-09-24 15:08:03,080 INFO  L78                 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36
[2020-09-24 15:08:03,080 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-09-24 15:08:03,080 INFO  L479      AbstractCegarLoop]: Abstraction has 42 states and 42 transitions.
[2020-09-24 15:08:03,081 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-09-24 15:08:03,081 INFO  L276                IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions.
[2020-09-24 15:08:03,082 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2020-09-24 15:08:03,082 INFO  L414         BasicCegarLoop]: Found error trace
[2020-09-24 15:08:03,082 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-09-24 15:08:03,082 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-09-24 15:08:03,083 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-09-24 15:08:03,083 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-09-24 15:08:03,083 INFO  L82        PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times
[2020-09-24 15:08:03,083 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-09-24 15:08:03,084 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418751431]
[2020-09-24 15:08:03,084 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-09-24 15:08:03,102 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-09-24 15:08:03,104 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-09-24 15:08:03,105 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-09-24 15:08:03,110 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-09-24 15:08:03,128 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 03:08:03 BoogieIcfgContainer
[2020-09-24 15:08:03,128 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-09-24 15:08:03,132 INFO  L168              Benchmark]: Toolchain (without parser) took 3399.16 ms. Allocated memory was 142.1 MB in the beginning and 242.2 MB in the end (delta: 100.1 MB). Free memory was 105.8 MB in the beginning and 188.1 MB in the end (delta: -82.3 MB). Peak memory consumption was 17.8 MB. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,133 INFO  L168              Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 142.1 MB. Free memory was 123.6 MB in the beginning and 123.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,134 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 305.28 ms. Allocated memory is still 142.1 MB. Free memory was 105.2 MB in the beginning and 95.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,135 INFO  L168              Benchmark]: Boogie Preprocessor took 115.86 ms. Allocated memory was 142.1 MB in the beginning and 203.4 MB in the end (delta: 61.3 MB). Free memory was 95.4 MB in the beginning and 183.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,136 INFO  L168              Benchmark]: RCFGBuilder took 290.67 ms. Allocated memory is still 203.4 MB. Free memory was 183.5 MB in the beginning and 171.1 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,137 INFO  L168              Benchmark]: TraceAbstraction took 2672.67 ms. Allocated memory was 203.4 MB in the beginning and 242.2 MB in the end (delta: 38.8 MB). Free memory was 171.1 MB in the beginning and 188.1 MB in the end (delta: -17.0 MB). Peak memory consumption was 21.8 MB. Max. memory is 7.1 GB.
[2020-09-24 15:08:03,141 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.21 ms. Allocated memory is still 142.1 MB. Free memory was 123.6 MB in the beginning and 123.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 305.28 ms. Allocated memory is still 142.1 MB. Free memory was 105.2 MB in the beginning and 95.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 115.86 ms. Allocated memory was 142.1 MB in the beginning and 203.4 MB in the end (delta: 61.3 MB). Free memory was 95.4 MB in the beginning and 183.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 290.67 ms. Allocated memory is still 203.4 MB. Free memory was 183.5 MB in the beginning and 171.1 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 2672.67 ms. Allocated memory was 203.4 MB in the beginning and 242.2 MB in the end (delta: 38.8 MB). Free memory was 171.1 MB in the beginning and 188.1 MB in the end (delta: -17.0 MB). Peak memory consumption was 21.8 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L11]              unsigned int x = 0;
[L12]              unsigned int y = 1;
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND TRUE   x < 6
[L15]              x++
[L16]              y *= 2
[L14]  COND FALSE  !(x < 6)
[L19]  CALL        __VERIFIER_assert(y != 64)
[L4]   COND TRUE   !(cond)
[L5]               __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.5s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 60 SDslu, 486 SDs, 0 SdLazy, 396 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, 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, 7 MinimizatonAttempts, 16 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 193 NumberOfCodeBlocks, 193 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 145 ConstructedInterpolants, 0 QuantifiedInterpolants, 19515 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 0/115 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...