/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c


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


This is Ultimate 0.2.0-b8ad66e
[2020-10-23 18:43:44,334 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-10-23 18:43:44,337 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-10-23 18:43:44,379 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-10-23 18:43:44,379 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-10-23 18:43:44,381 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-10-23 18:43:44,383 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-10-23 18:43:44,385 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-10-23 18:43:44,388 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-10-23 18:43:44,389 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-10-23 18:43:44,391 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-10-23 18:43:44,392 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-10-23 18:43:44,393 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-10-23 18:43:44,394 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-10-23 18:43:44,397 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-10-23 18:43:44,399 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-10-23 18:43:44,400 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-10-23 18:43:44,403 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-10-23 18:43:44,406 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-10-23 18:43:44,416 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-10-23 18:43:44,421 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-10-23 18:43:44,427 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-10-23 18:43:44,429 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-10-23 18:43:44,431 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-10-23 18:43:44,469 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-10-23 18:43:44,470 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-10-23 18:43:44,471 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-10-23 18:43:44,478 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-10-23 18:43:44,479 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-10-23 18:43:44,482 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-10-23 18:43:44,482 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-10-23 18:43:44,484 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-10-23 18:43:44,485 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-10-23 18:43:44,486 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-10-23 18:43:44,488 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-10-23 18:43:44,489 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-10-23 18:43:44,489 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-10-23 18:43:44,490 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-10-23 18:43:44,490 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-10-23 18:43:44,491 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-10-23 18:43:44,492 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-10-23 18:43:44,493 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-10-23 18:43:44,559 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-10-23 18:43:44,559 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-10-23 18:43:44,563 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-10-23 18:43:44,564 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-10-23 18:43:44,564 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-10-23 18:43:44,564 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-10-23 18:43:44,565 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-10-23 18:43:44,565 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-10-23 18:43:44,565 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-10-23 18:43:44,565 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-10-23 18:43:44,567 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-10-23 18:43:44,567 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-10-23 18:43:44,568 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-10-23 18:43:44,568 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-10-23 18:43:44,568 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-10-23 18:43:44,568 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-10-23 18:43:44,569 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-10-23 18:43:44,569 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-10-23 18:43:44,569 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-10-23 18:43:44,569 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-10-23 18:43:44,570 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-10-23 18:43:44,570 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-10-23 18:43:44,570 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-10-23 18:43:44,570 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-10-23 18:43:44,571 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-10-23 18:43:44,571 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-10-23 18:43:44,571 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-10-23 18:43:44,572 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-10-23 18:43:44,572 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-10-23 18:43:44,572 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
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$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[2020-10-23 18:43:45,093 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-10-23 18:43:45,147 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-10-23 18:43:45,150 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-10-23 18:43:45,152 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-10-23 18:43:45,152 INFO  L275        PluginConnector]: CDTParser initialized
[2020-10-23 18:43:45,153 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c
[2020-10-23 18:43:45,237 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549aba3b/b24968bd4091457387edf163ae3d0bae/FLAG43506af3a
[2020-10-23 18:43:45,842 INFO  L306              CDTParser]: Found 1 translation units.
[2020-10-23 18:43:45,842 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c
[2020-10-23 18:43:45,849 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549aba3b/b24968bd4091457387edf163ae3d0bae/FLAG43506af3a
[2020-10-23 18:43:46,230 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f549aba3b/b24968bd4091457387edf163ae3d0bae
[2020-10-23 18:43:46,235 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-10-23 18:43:46,247 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-10-23 18:43:46,249 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-10-23 18:43:46,249 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-10-23 18:43:46,253 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-10-23 18:43:46,254 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,259 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@154514ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46, skipping insertion in model container
[2020-10-23 18:43:46,259 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,268 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-10-23 18:43:46,293 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-10-23 18:43:46,468 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-23 18:43:46,479 INFO  L203         MainTranslator]: Completed pre-run
[2020-10-23 18:43:46,496 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-10-23 18:43:46,512 INFO  L208         MainTranslator]: Completed translation
[2020-10-23 18:43:46,512 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46 WrapperNode
[2020-10-23 18:43:46,513 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-10-23 18:43:46,514 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-10-23 18:43:46,514 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-10-23 18:43:46,514 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-10-23 18:43:46,528 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,528 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,535 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,536 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,541 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,545 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,547 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (1/1) ...
[2020-10-23 18:43:46,548 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-10-23 18:43:46,549 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-10-23 18:43:46,550 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-10-23 18:43:46,550 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-10-23 18:43:46,551 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (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 18:43:46,635 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-10-23 18:43:46,636 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-10-23 18:43:46,636 INFO  L138     BoogieDeclarations]: Found implementation of procedure reach_error
[2020-10-23 18:43:46,636 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-10-23 18:43:46,636 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-10-23 18:43:46,637 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-10-23 18:43:46,637 INFO  L130     BoogieDeclarations]: Found specification of procedure __assert_fail
[2020-10-23 18:43:46,637 INFO  L130     BoogieDeclarations]: Found specification of procedure reach_error
[2020-10-23 18:43:46,637 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-10-23 18:43:46,637 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-10-23 18:43:46,638 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-10-23 18:43:46,639 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-10-23 18:43:46,905 INFO  L293             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-10-23 18:43:46,906 INFO  L298             CfgBuilder]: Removed 1 assume(true) statements.
[2020-10-23 18:43:46,908 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:46 BoogieIcfgContainer
[2020-10-23 18:43:46,908 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-10-23 18:43:46,910 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-10-23 18:43:46,910 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-10-23 18:43:46,914 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-10-23 18:43:46,915 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:43:46" (1/3) ...
[2020-10-23 18:43:46,916 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2427b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:46, skipping insertion in model container
[2020-10-23 18:43:46,916 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:46" (2/3) ...
[2020-10-23 18:43:46,916 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2427b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:46, skipping insertion in model container
[2020-10-23 18:43:46,917 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:46" (3/3) ...
[2020-10-23 18:43:46,918 INFO  L111   eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c
[2020-10-23 18:43:46,932 INFO  L164   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2020-10-23 18:43:46,937 INFO  L176   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-10-23 18:43:46,953 INFO  L253      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-10-23 18:43:47,012 INFO  L377      AbstractCegarLoop]: Interprodecural is true
[2020-10-23 18:43:47,012 INFO  L378      AbstractCegarLoop]: Hoare is true
[2020-10-23 18:43:47,012 INFO  L379      AbstractCegarLoop]: Compute interpolants for FPandBP
[2020-10-23 18:43:47,013 INFO  L380      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-10-23 18:43:47,013 INFO  L381      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-10-23 18:43:47,013 INFO  L382      AbstractCegarLoop]: Difference is false
[2020-10-23 18:43:47,013 INFO  L383      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-10-23 18:43:47,013 INFO  L387      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-10-23 18:43:47,032 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states.
[2020-10-23 18:43:47,037 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-10-23 18:43:47,038 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:47,039 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:47,039 INFO  L429      AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:47,046 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:47,046 INFO  L82        PathProgramCache]: Analyzing trace with hash 783588435, now seen corresponding path program 1 times
[2020-10-23 18:43:47,056 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:47,057 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393599929]
[2020-10-23 18:43:47,057 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:47,189 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:47,319 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:47,325 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:47,343 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 18:43:47,344 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393599929]
[2020-10-23 18:43:47,345 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 18:43:47,346 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2020-10-23 18:43:47,347 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302000078]
[2020-10-23 18:43:47,353 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 3 states
[2020-10-23 18:43:47,353 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:47,369 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2020-10-23 18:43:47,371 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-23 18:43:47,374 INFO  L87              Difference]: Start difference. First operand 22 states. Second operand 3 states.
[2020-10-23 18:43:47,502 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:47,502 INFO  L93              Difference]: Finished difference Result 34 states and 38 transitions.
[2020-10-23 18:43:47,506 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-10-23 18:43:47,507 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 12
[2020-10-23 18:43:47,508 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:47,523 INFO  L225             Difference]: With dead ends: 34
[2020-10-23 18:43:47,524 INFO  L226             Difference]: Without dead ends: 13
[2020-10-23 18:43:47,529 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2020-10-23 18:43:47,549 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 13 states.
[2020-10-23 18:43:47,589 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13.
[2020-10-23 18:43:47,591 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 13 states.
[2020-10-23 18:43:47,592 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions.
[2020-10-23 18:43:47,594 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 12
[2020-10-23 18:43:47,596 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:47,596 INFO  L481      AbstractCegarLoop]: Abstraction has 13 states and 13 transitions.
[2020-10-23 18:43:47,597 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2020-10-23 18:43:47,597 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions.
[2020-10-23 18:43:47,598 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2020-10-23 18:43:47,598 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:47,598 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:47,599 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-10-23 18:43:47,599 INFO  L429      AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:47,600 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:47,600 INFO  L82        PathProgramCache]: Analyzing trace with hash 669071831, now seen corresponding path program 1 times
[2020-10-23 18:43:47,600 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:47,601 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624913280]
[2020-10-23 18:43:47,601 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:47,686 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:47,838 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:47,844 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:47,873 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 18:43:47,874 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624913280]
[2020-10-23 18:43:47,874 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-10-23 18:43:47,875 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-10-23 18:43:47,875 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682465891]
[2020-10-23 18:43:47,877 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-10-23 18:43:47,877 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:47,878 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-10-23 18:43:47,879 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-10-23 18:43:47,879 INFO  L87              Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 4 states.
[2020-10-23 18:43:48,040 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:48,041 INFO  L93              Difference]: Finished difference Result 20 states and 20 transitions.
[2020-10-23 18:43:48,042 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-10-23 18:43:48,042 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 12
[2020-10-23 18:43:48,043 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:48,044 INFO  L225             Difference]: With dead ends: 20
[2020-10-23 18:43:48,045 INFO  L226             Difference]: Without dead ends: 14
[2020-10-23 18:43:48,047 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-10-23 18:43:48,048 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2020-10-23 18:43:48,064 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14.
[2020-10-23 18:43:48,064 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 14 states.
[2020-10-23 18:43:48,066 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions.
[2020-10-23 18:43:48,066 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12
[2020-10-23 18:43:48,066 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:48,067 INFO  L481      AbstractCegarLoop]: Abstraction has 14 states and 14 transitions.
[2020-10-23 18:43:48,067 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-10-23 18:43:48,068 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions.
[2020-10-23 18:43:48,069 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-10-23 18:43:48,069 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:48,069 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:48,070 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-10-23 18:43:48,070 INFO  L429      AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:48,073 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:48,074 INFO  L82        PathProgramCache]: Analyzing trace with hash 396678398, now seen corresponding path program 1 times
[2020-10-23 18:43:48,074 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:48,074 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194559396]
[2020-10-23 18:43:48,075 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:48,127 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:48,272 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:48,275 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:48,283 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:48,284 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194559396]
[2020-10-23 18:43:48,284 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [905140932]
[2020-10-23 18:43:48,285 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:48,359 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:48,362 INFO  L263         TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core
[2020-10-23 18:43:48,368 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-10-23 18:43:48,408 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:48,408 INFO  L219   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-10-23 18:43:48,409 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6
[2020-10-23 18:43:48,409 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315698875]
[2020-10-23 18:43:48,410 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-10-23 18:43:48,410 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:48,411 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-10-23 18:43:48,411 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-10-23 18:43:48,411 INFO  L87              Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states.
[2020-10-23 18:43:48,594 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:48,594 INFO  L93              Difference]: Finished difference Result 21 states and 21 transitions.
[2020-10-23 18:43:48,594 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-10-23 18:43:48,595 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 13
[2020-10-23 18:43:48,595 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:48,596 INFO  L225             Difference]: With dead ends: 21
[2020-10-23 18:43:48,596 INFO  L226             Difference]: Without dead ends: 15
[2020-10-23 18:43:48,597 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56
[2020-10-23 18:43:48,597 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 15 states.
[2020-10-23 18:43:48,601 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15.
[2020-10-23 18:43:48,602 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 15 states.
[2020-10-23 18:43:48,603 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions.
[2020-10-23 18:43:48,603 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13
[2020-10-23 18:43:48,603 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:48,603 INFO  L481      AbstractCegarLoop]: Abstraction has 15 states and 15 transitions.
[2020-10-23 18:43:48,603 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-10-23 18:43:48,604 INFO  L276                IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions.
[2020-10-23 18:43:48,604 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-10-23 18:43:48,604 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:48,605 INFO  L422         BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:48,817 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2
[2020-10-23 18:43:48,818 INFO  L429      AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:48,819 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:48,820 INFO  L82        PathProgramCache]: Analyzing trace with hash 542416567, now seen corresponding path program 2 times
[2020-10-23 18:43:48,820 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:48,821 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628834510]
[2020-10-23 18:43:48,821 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:48,842 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:48,978 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:48,981 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:48,988 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:48,989 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628834510]
[2020-10-23 18:43:48,989 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318709729]
[2020-10-23 18:43:48,989 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:49,043 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2020-10-23 18:43:49,043 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-10-23 18:43:49,045 INFO  L263         TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core
[2020-10-23 18:43:49,046 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-10-23 18:43:49,102 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:49,103 INFO  L219   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-10-23 18:43:49,103 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7
[2020-10-23 18:43:49,103 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753854711]
[2020-10-23 18:43:49,104 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-10-23 18:43:49,104 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:49,105 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-10-23 18:43:49,105 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42
[2020-10-23 18:43:49,105 INFO  L87              Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states.
[2020-10-23 18:43:49,251 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:49,252 INFO  L93              Difference]: Finished difference Result 22 states and 22 transitions.
[2020-10-23 18:43:49,252 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-10-23 18:43:49,252 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 14
[2020-10-23 18:43:49,253 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:49,253 INFO  L225             Difference]: With dead ends: 22
[2020-10-23 18:43:49,253 INFO  L226             Difference]: Without dead ends: 16
[2020-10-23 18:43:49,254 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90
[2020-10-23 18:43:49,254 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16 states.
[2020-10-23 18:43:49,259 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16.
[2020-10-23 18:43:49,259 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16 states.
[2020-10-23 18:43:49,260 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions.
[2020-10-23 18:43:49,260 INFO  L78                 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14
[2020-10-23 18:43:49,260 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:49,260 INFO  L481      AbstractCegarLoop]: Abstraction has 16 states and 16 transitions.
[2020-10-23 18:43:49,261 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-10-23 18:43:49,261 INFO  L276                IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions.
[2020-10-23 18:43:49,261 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2020-10-23 18:43:49,261 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:49,262 INFO  L422         BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:49,473 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:49,474 INFO  L429      AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:49,475 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:49,475 INFO  L82        PathProgramCache]: Analyzing trace with hash 765332510, now seen corresponding path program 3 times
[2020-10-23 18:43:49,476 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:49,477 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917339115]
[2020-10-23 18:43:49,477 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:49,492 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:49,597 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:49,600 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:49,610 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:49,610 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917339115]
[2020-10-23 18:43:49,610 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854755505]
[2020-10-23 18:43:49,611 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:49,660 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2020-10-23 18:43:49,661 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-10-23 18:43:49,662 INFO  L263         TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 9 conjunts are in the unsatisfiable core
[2020-10-23 18:43:49,663 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-10-23 18:43:49,698 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:49,698 INFO  L219   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-10-23 18:43:49,698 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8
[2020-10-23 18:43:49,699 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80685724]
[2020-10-23 18:43:49,699 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-10-23 18:43:49,699 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:49,700 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-10-23 18:43:49,700 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2020-10-23 18:43:49,700 INFO  L87              Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states.
[2020-10-23 18:43:49,892 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:49,892 INFO  L93              Difference]: Finished difference Result 23 states and 23 transitions.
[2020-10-23 18:43:49,892 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-10-23 18:43:49,893 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 15
[2020-10-23 18:43:49,893 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:49,894 INFO  L225             Difference]: With dead ends: 23
[2020-10-23 18:43:49,894 INFO  L226             Difference]: Without dead ends: 17
[2020-10-23 18:43:49,895 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132
[2020-10-23 18:43:49,895 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 17 states.
[2020-10-23 18:43:49,900 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17.
[2020-10-23 18:43:49,900 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 17 states.
[2020-10-23 18:43:49,901 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions.
[2020-10-23 18:43:49,901 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15
[2020-10-23 18:43:49,901 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:49,902 INFO  L481      AbstractCegarLoop]: Abstraction has 17 states and 17 transitions.
[2020-10-23 18:43:49,902 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-10-23 18:43:49,902 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions.
[2020-10-23 18:43:49,902 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2020-10-23 18:43:49,903 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:49,903 INFO  L422         BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:50,115 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:50,116 INFO  L429      AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:50,117 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:50,118 INFO  L82        PathProgramCache]: Analyzing trace with hash -914207849, now seen corresponding path program 4 times
[2020-10-23 18:43:50,118 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:50,118 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317518053]
[2020-10-23 18:43:50,118 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:50,134 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:50,235 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:50,238 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:50,244 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:50,244 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317518053]
[2020-10-23 18:43:50,245 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152411307]
[2020-10-23 18:43:50,245 INFO  L93    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:50,295 INFO  L228   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2020-10-23 18:43:50,295 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-10-23 18:43:50,298 INFO  L263         TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 11 conjunts are in the unsatisfiable core
[2020-10-23 18:43:50,300 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-10-23 18:43:50,341 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:50,342 INFO  L219   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-10-23 18:43:50,342 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9
[2020-10-23 18:43:50,342 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837597142]
[2020-10-23 18:43:50,343 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-10-23 18:43:50,343 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:50,344 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-10-23 18:43:50,344 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72
[2020-10-23 18:43:50,345 INFO  L87              Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states.
[2020-10-23 18:43:50,634 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:50,634 INFO  L93              Difference]: Finished difference Result 24 states and 24 transitions.
[2020-10-23 18:43:50,635 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-10-23 18:43:50,635 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 16
[2020-10-23 18:43:50,635 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:50,636 INFO  L225             Difference]: With dead ends: 24
[2020-10-23 18:43:50,636 INFO  L226             Difference]: Without dead ends: 18
[2020-10-23 18:43:50,636 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182
[2020-10-23 18:43:50,637 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2020-10-23 18:43:50,641 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18.
[2020-10-23 18:43:50,642 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2020-10-23 18:43:50,642 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions.
[2020-10-23 18:43:50,642 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16
[2020-10-23 18:43:50,643 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:50,643 INFO  L481      AbstractCegarLoop]: Abstraction has 18 states and 18 transitions.
[2020-10-23 18:43:50,643 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-10-23 18:43:50,643 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions.
[2020-10-23 18:43:50,644 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2020-10-23 18:43:50,644 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:50,644 INFO  L422         BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:50,856 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:50,857 INFO  L429      AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:50,858 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:50,858 INFO  L82        PathProgramCache]: Analyzing trace with hash -1440351426, now seen corresponding path program 5 times
[2020-10-23 18:43:50,858 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:50,859 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418539467]
[2020-10-23 18:43:50,859 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:50,883 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:51,058 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-10-23 18:43:51,061 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-10-23 18:43:51,066 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:51,067 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418539467]
[2020-10-23 18:43:51,067 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962984402]
[2020-10-23 18:43:51,067 INFO  L93    rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2020-10-23 18:43:51,146 INFO  L228   tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s)
[2020-10-23 18:43:51,146 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2020-10-23 18:43:51,150 INFO  L263         TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core
[2020-10-23 18:43:51,151 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-10-23 18:43:51,223 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-10-23 18:43:51,224 INFO  L219   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-10-23 18:43:51,224 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10
[2020-10-23 18:43:51,224 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565254778]
[2020-10-23 18:43:51,225 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-10-23 18:43:51,225 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2020-10-23 18:43:51,226 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-10-23 18:43:51,227 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90
[2020-10-23 18:43:51,227 INFO  L87              Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states.
[2020-10-23 18:43:51,594 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-10-23 18:43:51,595 INFO  L93              Difference]: Finished difference Result 25 states and 25 transitions.
[2020-10-23 18:43:51,595 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-10-23 18:43:51,595 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 17
[2020-10-23 18:43:51,596 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-10-23 18:43:51,596 INFO  L225             Difference]: With dead ends: 25
[2020-10-23 18:43:51,597 INFO  L226             Difference]: Without dead ends: 19
[2020-10-23 18:43:51,598 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240
[2020-10-23 18:43:51,598 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2020-10-23 18:43:51,602 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2020-10-23 18:43:51,603 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2020-10-23 18:43:51,603 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions.
[2020-10-23 18:43:51,604 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17
[2020-10-23 18:43:51,604 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-10-23 18:43:51,604 INFO  L481      AbstractCegarLoop]: Abstraction has 19 states and 19 transitions.
[2020-10-23 18:43:51,604 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-10-23 18:43:51,604 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions.
[2020-10-23 18:43:51,605 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2020-10-23 18:43:51,605 INFO  L414         BasicCegarLoop]: Found error trace
[2020-10-23 18:43:51,605 INFO  L422         BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-10-23 18:43:51,817 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6
[2020-10-23 18:43:51,818 INFO  L429      AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-10-23 18:43:51,819 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-10-23 18:43:51,819 INFO  L82        PathProgramCache]: Analyzing trace with hash -570933129, now seen corresponding path program 6 times
[2020-10-23 18:43:51,819 INFO  L162   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2020-10-23 18:43:51,820 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952468481]
[2020-10-23 18:43:51,820 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-10-23 18:43:51,849 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-10-23 18:43:51,850 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-10-23 18:43:51,885 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-10-23 18:43:51,885 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-10-23 18:43:51,920 INFO  L173   FreeRefinementEngine]: Strategy CAMEL found a feasible trace
[2020-10-23 18:43:51,921 INFO  L523         BasicCegarLoop]: Counterexample might be feasible
[2020-10-23 18:43:51,921 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-10-23 18:43:51,980 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:43:51 BoogieIcfgContainer
[2020-10-23 18:43:51,980 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-10-23 18:43:51,983 INFO  L168              Benchmark]: Toolchain (without parser) took 5741.58 ms. Allocated memory was 151.0 MB in the beginning and 194.0 MB in the end (delta: 43.0 MB). Free memory was 127.1 MB in the beginning and 128.5 MB in the end (delta: -1.4 MB). Peak memory consumption was 42.8 MB. Max. memory is 8.0 GB.
[2020-10-23 18:43:51,985 INFO  L168              Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory was 124.2 MB in the beginning and 124.2 MB in the end (delta: 77.4 kB). There was no memory consumed. Max. memory is 8.0 GB.
[2020-10-23 18:43:51,987 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 264.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.3 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB.
[2020-10-23 18:43:51,988 INFO  L168              Benchmark]: Boogie Preprocessor took 34.58 ms. Allocated memory is still 151.0 MB. Free memory was 117.3 MB in the beginning and 115.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB.
[2020-10-23 18:43:51,993 INFO  L168              Benchmark]: RCFGBuilder took 358.91 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 104.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB.
[2020-10-23 18:43:51,994 INFO  L168              Benchmark]: TraceAbstraction took 5070.38 ms. Allocated memory was 151.0 MB in the beginning and 194.0 MB in the end (delta: 43.0 MB). Free memory was 103.7 MB in the beginning and 128.5 MB in the end (delta: -24.8 MB). Peak memory consumption was 19.7 MB. Max. memory is 8.0 GB.
[2020-10-23 18:43:52,006 INFO  L339   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory was 124.2 MB in the beginning and 124.2 MB in the end (delta: 77.4 kB). There was no memory consumed. Max. memory is 8.0 GB.
 * CACSL2BoogieTranslator took 264.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.3 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB.
 * Boogie Preprocessor took 34.58 ms. Allocated memory is still 151.0 MB. Free memory was 117.3 MB in the beginning and 115.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB.
 * RCFGBuilder took 358.91 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 104.1 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB.
 * TraceAbstraction took 5070.38 ms. Allocated memory was 151.0 MB in the beginning and 194.0 MB in the end (delta: 43.0 MB). Free memory was 103.7 MB in the beginning and 128.5 MB in the end (delta: -24.8 MB). Peak memory consumption was 19.7 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;
       VAL         [x=0, y=1]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=1, y=2]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=2, y=4]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=3, y=8]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=4, y=16]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=5, y=32]
[L16]  COND TRUE   x < 6
[L17]              x++
[L18]              y *= 2
       VAL         [x=6, y=64]
[L16]  COND FALSE  !(x < 6)
       VAL         [x=6, y=64]
[L21]  CALL        __VERIFIER_assert(y != 64)
       VAL         [\old(cond)=0]
[L6]   COND TRUE   !(cond)
       VAL         [\old(cond)=0, cond=0]
[L7]   CALL        reach_error()
[L3]               __assert_fail("0", "underapprox_1-1.c", 3, "reach_error")

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 5 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.9s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 83 SDtfs, 45 SDslu, 159 SDs, 0 SdLazy, 251 SolverSat, 57 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 140 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, 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, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 192 NumberOfCodeBlocks, 192 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 162 ConstructedInterpolants, 0 QuantifiedInterpolants, 8156 SizeOfPredicates, 5 NumberOfNonLiveVariables, 525 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 12 InterpolantComputations, 2 PerfectInterpolantSequences, 0/70 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...