/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c


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


This is Ultimate 0.2.0-b8ad66e
[2020-10-23 21:47:50,751 INFO  L177        SettingsManager]: Resetting all preferences to default values...
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[2020-10-23 21:47:50,874 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
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[2020-10-23 21:47:50,925 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf
[2020-10-23 21:47:50,949 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-10-23 21:47:50,949 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-10-23 21:47:50,954 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-10-23 21:47:50,954 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-10-23 21:47:50,955 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-10-23 21:47:50,957 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-10-23 21:47:50,957 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-10-23 21:47:50,957 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-10-23 21:47:50,958 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-10-23 21:47:50,958 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-10-23 21:47:50,958 INFO  L138        SettingsManager]:  * Size of a code block=SingleStatement
[2020-10-23 21:47:50,959 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-10-23 21:47:50,959 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-10-23 21:47:50,959 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-10-23 21:47:50,959 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-10-23 21:47:50,959 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=AcceleratedInterpolation
[2020-10-23 21:47:50,960 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-10-23 21:47:50,960 INFO  L138        SettingsManager]:  * Use separate solver for trace checks=false
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[2020-10-23 21:47:51,479 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-10-23 21:47:51,507 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-10-23 21:47:51,511 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-10-23 21:47:51,512 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-10-23 21:47:51,513 INFO  L275        PluginConnector]: CDTParser initialized
[2020-10-23 21:47:51,514 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c
[2020-10-23 21:47:51,610 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb/FLAG44436f871
[2020-10-23 21:47:52,386 INFO  L306              CDTParser]: Found 1 translation units.
[2020-10-23 21:47:52,386 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c
[2020-10-23 21:47:52,394 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb/FLAG44436f871
[2020-10-23 21:47:52,727 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce1488ca3/63e5899792f54682be88242564c95dbb
[2020-10-23 21:47:52,731 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-10-23 21:47:52,739 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-10-23 21:47:52,741 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-10-23 21:47:52,741 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-10-23 21:47:52,745 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-10-23 21:47:52,747 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:52" (1/1) ...
[2020-10-23 21:47:52,750 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38d5935a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:52, skipping insertion in model container
[2020-10-23 21:47:52,751 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:47:52" (1/1) ...
[2020-10-23 21:47:52,760 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-10-23 21:47:52,775 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-10-23 21:47:52,982 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-23 21:47:52,994 INFO  L203         MainTranslator]: Completed pre-run
[2020-10-23 21:47:53,011 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-23 21:47:53,028 INFO  L208         MainTranslator]: Completed translation
[2020-10-23 21:47:53,029 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53 WrapperNode
[2020-10-23 21:47:53,029 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-10-23 21:47:53,030 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-10-23 21:47:53,031 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-10-23 21:47:53,031 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-10-23 21:47:53,045 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,045 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,053 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,054 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,060 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,065 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,066 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (1/1) ...
[2020-10-23 21:47:53,068 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-10-23 21:47:53,070 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-10-23 21:47:53,070 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-10-23 21:47:53,070 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-10-23 21:47:53,071 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (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
[2020-10-23 21:47:53,156 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-10-23 21:47:53,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-10-23 21:47:53,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure reach_error
[2020-10-23 21:47:53,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-10-23 21:47:53,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-10-23 21:47:53,157 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure __assert_fail
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure reach_error
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-10-23 21:47:53,158 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2020-10-23 21:47:53,159 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-10-23 21:47:53,159 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-10-23 21:47:53,159 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-10-23 21:47:53,159 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-10-23 21:47:53,581 INFO  L293             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-10-23 21:47:53,582 INFO  L298             CfgBuilder]: Removed 1 assume(true) statements.
[2020-10-23 21:47:53,586 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:53 BoogieIcfgContainer
[2020-10-23 21:47:53,587 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-10-23 21:47:53,594 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-10-23 21:47:53,596 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-10-23 21:47:53,601 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-10-23 21:47:53,602 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:47:52" (1/3) ...
[2020-10-23 21:47:53,603 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139e2fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:53, skipping insertion in model container
[2020-10-23 21:47:53,603 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:47:53" (2/3) ...
[2020-10-23 21:47:53,604 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139e2fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:47:53, skipping insertion in model container
[2020-10-23 21:47:53,605 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:47:53" (3/3) ...
[2020-10-23 21:47:53,607 INFO  L111   eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c
[2020-10-23 21:47:53,623 INFO  L164   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-10-23 21:47:53,630 INFO  L176   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-10-23 21:47:53,649 INFO  L253      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-10-23 21:47:53,703 INFO  L377      AbstractCegarLoop]: Interprodecural is true
[2020-10-23 21:47:53,704 INFO  L378      AbstractCegarLoop]: Hoare is true
[2020-10-23 21:47:53,704 INFO  L379      AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation
[2020-10-23 21:47:53,704 INFO  L380      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-10-23 21:47:53,704 INFO  L381      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-10-23 21:47:53,704 INFO  L382      AbstractCegarLoop]: Difference is false
[2020-10-23 21:47:53,705 INFO  L383      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-10-23 21:47:53,705 INFO  L387      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-10-23 21:47:53,731 INFO  L276                IsEmpty]: Start isEmpty. Operand 34 states.
[2020-10-23 21:47:53,746 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2020-10-23 21:47:53,747 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:47:53,748 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:47:53,749 INFO  L429      AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:47:53,763 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:47:53,764 INFO  L82        PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times
[2020-10-23 21:47:53,785 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:47:53,787 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612542686]
[2020-10-23 21:47:53,787 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:47:53,884 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:47:54,046 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:54,320 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:47:54,330 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:54,365 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:47:54,367 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612542686]
[2020-10-23 21:47:54,370 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:47:54,371 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-10-23 21:47:54,371 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725768790]
[2020-10-23 21:47:54,378 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-10-23 21:47:54,379 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:47:54,395 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-10-23 21:47:54,396 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2020-10-23 21:47:54,399 INFO  L87              Difference]: Start difference. First operand 34 states. Second operand 6 states.
[2020-10-23 21:47:54,670 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:47:54,670 INFO  L93              Difference]: Finished difference Result 49 states and 55 transitions.
[2020-10-23 21:47:54,671 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-10-23 21:47:54,673 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 20
[2020-10-23 21:47:54,673 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:47:54,682 INFO  L225             Difference]: With dead ends: 49
[2020-10-23 21:47:54,682 INFO  L226             Difference]: Without dead ends: 28
[2020-10-23 21:47:54,686 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2020-10-23 21:47:54,710 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28 states.
[2020-10-23 21:47:54,762 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26.
[2020-10-23 21:47:54,764 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 26 states.
[2020-10-23 21:47:54,767 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions.
[2020-10-23 21:47:54,769 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20
[2020-10-23 21:47:54,769 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:47:54,770 INFO  L481      AbstractCegarLoop]: Abstraction has 26 states and 26 transitions.
[2020-10-23 21:47:54,771 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-10-23 21:47:54,771 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions.
[2020-10-23 21:47:54,773 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-10-23 21:47:54,773 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:47:54,774 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:47:54,774 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-10-23 21:47:54,775 INFO  L429      AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:47:54,776 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:47:54,776 INFO  L82        PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times
[2020-10-23 21:47:54,776 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:47:54,777 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025431548]
[2020-10-23 21:47:54,777 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:47:54,950 WARN  L193               SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:54,968 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:47:54,970 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:47:54,994 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:55,121 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:47:55,126 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:55,137 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:47:55,137 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025431548]
[2020-10-23 21:47:55,138 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:47:55,138 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8
[2020-10-23 21:47:55,138 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842338527]
[2020-10-23 21:47:55,139 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-10-23 21:47:55,140 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:47:55,140 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-10-23 21:47:55,141 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56
[2020-10-23 21:47:55,141 INFO  L87              Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states.
[2020-10-23 21:47:55,407 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:47:55,408 INFO  L93              Difference]: Finished difference Result 39 states and 39 transitions.
[2020-10-23 21:47:55,409 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-10-23 21:47:55,409 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 25
[2020-10-23 21:47:55,409 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:47:55,410 INFO  L225             Difference]: With dead ends: 39
[2020-10-23 21:47:55,411 INFO  L226             Difference]: Without dead ends: 33
[2020-10-23 21:47:55,412 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132
[2020-10-23 21:47:55,413 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2020-10-23 21:47:55,425 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31.
[2020-10-23 21:47:55,425 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-10-23 21:47:55,426 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions.
[2020-10-23 21:47:55,427 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25
[2020-10-23 21:47:55,427 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:47:55,427 INFO  L481      AbstractCegarLoop]: Abstraction has 31 states and 31 transitions.
[2020-10-23 21:47:55,427 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-10-23 21:47:55,428 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions.
[2020-10-23 21:47:55,429 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 31
[2020-10-23 21:47:55,429 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:47:55,429 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:47:55,429 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-10-23 21:47:55,430 INFO  L429      AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:47:55,430 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:47:55,431 INFO  L82        PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times
[2020-10-23 21:47:55,431 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:47:55,431 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241645678]
[2020-10-23 21:47:55,431 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:47:55,693 WARN  L193               SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:55,955 WARN  L193               SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:56,103 WARN  L193               SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:56,106 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:47:56,108 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:47:56,127 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:56,334 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:47:56,338 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:56,348 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:47:56,349 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241645678]
[2020-10-23 21:47:56,349 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:47:56,350 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10
[2020-10-23 21:47:56,350 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455791919]
[2020-10-23 21:47:56,350 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-10-23 21:47:56,351 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:47:56,351 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-10-23 21:47:56,352 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90
[2020-10-23 21:47:56,352 INFO  L87              Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 10 states.
[2020-10-23 21:47:56,806 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:47:56,807 INFO  L93              Difference]: Finished difference Result 44 states and 44 transitions.
[2020-10-23 21:47:56,808 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-10-23 21:47:56,808 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 30
[2020-10-23 21:47:56,808 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:47:56,810 INFO  L225             Difference]: With dead ends: 44
[2020-10-23 21:47:56,810 INFO  L226             Difference]: Without dead ends: 38
[2020-10-23 21:47:56,811 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272
[2020-10-23 21:47:56,812 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 38 states.
[2020-10-23 21:47:56,834 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36.
[2020-10-23 21:47:56,835 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 36 states.
[2020-10-23 21:47:56,837 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions.
[2020-10-23 21:47:56,838 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30
[2020-10-23 21:47:56,839 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:47:56,839 INFO  L481      AbstractCegarLoop]: Abstraction has 36 states and 36 transitions.
[2020-10-23 21:47:56,840 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-10-23 21:47:56,840 INFO  L276                IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions.
[2020-10-23 21:47:56,841 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 36
[2020-10-23 21:47:56,843 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:47:56,843 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:47:56,843 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-10-23 21:47:56,844 INFO  L429      AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:47:56,845 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:47:56,845 INFO  L82        PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times
[2020-10-23 21:47:56,845 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:47:56,846 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604598053]
[2020-10-23 21:47:56,847 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:47:56,994 WARN  L193               SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:57,139 WARN  L193               SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:57,278 WARN  L193               SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:57,466 WARN  L193               SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:57,625 WARN  L193               SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:57,629 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:47:57,630 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:47:57,650 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:57,851 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:47:57,854 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:57,864 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:47:57,865 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604598053]
[2020-10-23 21:47:57,865 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:47:57,866 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12
[2020-10-23 21:47:57,866 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627858818]
[2020-10-23 21:47:57,866 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-10-23 21:47:57,867 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:47:57,867 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-10-23 21:47:57,869 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2020-10-23 21:47:57,869 INFO  L87              Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 12 states.
[2020-10-23 21:47:58,581 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:47:58,581 INFO  L93              Difference]: Finished difference Result 49 states and 49 transitions.
[2020-10-23 21:47:58,589 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-10-23 21:47:58,590 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 35
[2020-10-23 21:47:58,590 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:47:58,591 INFO  L225             Difference]: With dead ends: 49
[2020-10-23 21:47:58,591 INFO  L226             Difference]: Without dead ends: 43
[2020-10-23 21:47:58,592 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462
[2020-10-23 21:47:58,593 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 43 states.
[2020-10-23 21:47:58,608 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41.
[2020-10-23 21:47:58,609 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 41 states.
[2020-10-23 21:47:58,614 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions.
[2020-10-23 21:47:58,615 INFO  L78                 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35
[2020-10-23 21:47:58,615 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:47:58,615 INFO  L481      AbstractCegarLoop]: Abstraction has 41 states and 41 transitions.
[2020-10-23 21:47:58,616 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-10-23 21:47:58,616 INFO  L276                IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions.
[2020-10-23 21:47:58,617 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 41
[2020-10-23 21:47:58,617 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:47:58,617 INFO  L422         BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:47:58,618 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-10-23 21:47:58,618 INFO  L429      AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:47:58,620 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:47:58,620 INFO  L82        PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times
[2020-10-23 21:47:58,620 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:47:58,621 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617275109]
[2020-10-23 21:47:58,621 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:47:58,872 WARN  L193               SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:59,005 WARN  L193               SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:47:59,158 WARN  L193               SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:59,305 WARN  L193               SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:47:59,308 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:47:59,310 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:47:59,331 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:59,605 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:47:59,609 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:47:59,622 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:47:59,622 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617275109]
[2020-10-23 21:47:59,623 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:47:59,623 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14
[2020-10-23 21:47:59,623 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905918015]
[2020-10-23 21:47:59,624 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-10-23 21:47:59,624 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:47:59,624 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-10-23 21:47:59,625 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182
[2020-10-23 21:47:59,625 INFO  L87              Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 14 states.
[2020-10-23 21:48:00,531 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:48:00,532 INFO  L93              Difference]: Finished difference Result 54 states and 54 transitions.
[2020-10-23 21:48:00,533 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-10-23 21:48:00,534 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 40
[2020-10-23 21:48:00,534 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:48:00,535 INFO  L225             Difference]: With dead ends: 54
[2020-10-23 21:48:00,535 INFO  L226             Difference]: Without dead ends: 48
[2020-10-23 21:48:00,536 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=120, Invalid=582, Unknown=0, NotChecked=0, Total=702
[2020-10-23 21:48:00,537 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 48 states.
[2020-10-23 21:48:00,549 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46.
[2020-10-23 21:48:00,549 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 46 states.
[2020-10-23 21:48:00,550 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions.
[2020-10-23 21:48:00,550 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40
[2020-10-23 21:48:00,551 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:48:00,551 INFO  L481      AbstractCegarLoop]: Abstraction has 46 states and 46 transitions.
[2020-10-23 21:48:00,551 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-10-23 21:48:00,551 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions.
[2020-10-23 21:48:00,552 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 46
[2020-10-23 21:48:00,553 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:48:00,553 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:48:00,553 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-10-23 21:48:00,553 INFO  L429      AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:48:00,554 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:48:00,554 INFO  L82        PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times
[2020-10-23 21:48:00,554 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:48:00,555 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131151688]
[2020-10-23 21:48:00,555 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:48:00,678 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:48:00,808 WARN  L193               SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:48:00,947 WARN  L193               SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:48:01,103 WARN  L193               SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:48:01,250 WARN  L193               SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:48:01,253 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:48:01,255 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:48:01,302 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:48:01,630 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 21:48:01,634 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 21:48:01,645 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 21:48:01,645 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131151688]
[2020-10-23 21:48:01,645 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 21:48:01,646 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16
[2020-10-23 21:48:01,646 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578315934]
[2020-10-23 21:48:01,646 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 16 states
[2020-10-23 21:48:01,647 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-10-23 21:48:01,647 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants.
[2020-10-23 21:48:01,648 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240
[2020-10-23 21:48:01,648 INFO  L87              Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 16 states.
[2020-10-23 21:48:02,809 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 21:48:02,809 INFO  L93              Difference]: Finished difference Result 59 states and 59 transitions.
[2020-10-23 21:48:02,812 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. 
[2020-10-23 21:48:02,812 INFO  L78                 Accepts]: Start accepts. Automaton has 16 states. Word has length 45
[2020-10-23 21:48:02,812 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 21:48:02,813 INFO  L225             Difference]: With dead ends: 59
[2020-10-23 21:48:02,813 INFO  L226             Difference]: Without dead ends: 53
[2020-10-23 21:48:02,814 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992
[2020-10-23 21:48:02,815 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 53 states.
[2020-10-23 21:48:02,828 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51.
[2020-10-23 21:48:02,829 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 51 states.
[2020-10-23 21:48:02,830 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions.
[2020-10-23 21:48:02,830 INFO  L78                 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45
[2020-10-23 21:48:02,831 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 21:48:02,831 INFO  L481      AbstractCegarLoop]: Abstraction has 51 states and 51 transitions.
[2020-10-23 21:48:02,831 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 16 states.
[2020-10-23 21:48:02,831 INFO  L276                IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions.
[2020-10-23 21:48:02,832 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 51
[2020-10-23 21:48:02,832 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 21:48:02,833 INFO  L422         BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 21:48:02,833 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-10-23 21:48:02,833 INFO  L429      AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 21:48:02,834 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 21:48:02,834 INFO  L82        PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times
[2020-10-23 21:48:02,834 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-10-23 21:48:02,834 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669656639]
[2020-10-23 21:48:02,835 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 21:48:03,077 WARN  L193               SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:48:03,206 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 34
[2020-10-23 21:48:03,361 WARN  L193               SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:48:03,507 WARN  L193               SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 36
[2020-10-23 21:48:03,509 INFO  L120            Accelerator]: FastUPR could not accelerate loop because java.lang.UnsupportedOperationException: No Result found.
[2020-10-23 21:48:03,510 INFO  L321   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-10-23 21:48:03,538 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-10-23 21:48:03,538 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-10-23 21:48:03,561 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-10-23 21:48:03,561 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-10-23 21:48:03,615 INFO  L173   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-10-23 21:48:03,616 INFO  L523         BasicCegarLoop]: Counterexample might be feasible
[2020-10-23 21:48:03,617 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-10-23 21:48:03,642 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 09:48:03 BoogieIcfgContainer
[2020-10-23 21:48:03,643 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-10-23 21:48:03,649 INFO  L168              Benchmark]: Toolchain (without parser) took 10910.91 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 127.1 MB in the beginning and 119.6 MB in the end (delta: 7.5 MB). Peak memory consumption was 86.8 MB. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,650 INFO  L168              Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 126.3 MB. There was no memory consumed. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,651 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 288.81 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 117.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,651 INFO  L168              Benchmark]: Boogie Preprocessor took 38.12 ms. Allocated memory is still 151.0 MB. Free memory was 117.6 MB in the beginning and 116.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,652 INFO  L168              Benchmark]: RCFGBuilder took 518.03 ms. Allocated memory is still 151.0 MB. Free memory was 116.2 MB in the beginning and 102.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,653 INFO  L168              Benchmark]: TraceAbstraction took 10049.18 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 102.2 MB in the beginning and 119.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 61.6 MB. Max. memory is 8.0 GB.
[2020-10-23 21:48:03,659 INFO  L339   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 126.3 MB. There was no memory consumed. Max. memory is 8.0 GB.
 * CACSL2BoogieTranslator took 288.81 ms. Allocated memory is still 151.0 MB. Free memory was 126.7 MB in the beginning and 117.6 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB.
 * Boogie Preprocessor took 38.12 ms. Allocated memory is still 151.0 MB. Free memory was 117.6 MB in the beginning and 116.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB.
 * RCFGBuilder took 518.03 ms. Allocated memory is still 151.0 MB. Free memory was 116.2 MB in the beginning and 102.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB.
 * TraceAbstraction took 10049.18 ms. Allocated memory was 151.0 MB in the beginning and 229.6 MB in the end (delta: 78.6 MB). Free memory was 102.2 MB in the beginning and 119.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 61.6 MB. Max. memory is 8.0 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L13]              unsigned int x = 0;
[L14]              unsigned int y = 1;
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
[L16]  COND FALSE  !(x < 6)
[L21]  CALL        __VERIFIER_assert(x != 6)
[L6]   COND TRUE   !(cond)
[L7]   CALL        reach_error()
[L3]               __assert_fail("0", "underapprox_2-1.c", 3, "reach_error")

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.9s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 3.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 649 SDs, 0 SdLazy, 980 SolverSat, 64 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 130 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 3.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...