/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/verifythis/tree_del_rec_incorrect.c


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


This is Ultimate 0.2.0-7d8eed3
[2020-11-07 00:44:45,292 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-11-07 00:44:45,295 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-11-07 00:44:45,358 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-11-07 00:44:45,359 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-11-07 00:44:45,365 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-11-07 00:44:45,370 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-11-07 00:44:45,380 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-11-07 00:44:45,384 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
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[2020-11-07 00:44:45,403 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-11-07 00:44:45,404 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-11-07 00:44:45,408 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-11-07 00:44:45,418 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-11-07 00:44:45,428 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-11-07 00:44:45,430 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-11-07 00:44:45,432 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-11-07 00:44:45,434 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-11-07 00:44:45,436 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-11-07 00:44:45,446 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2020-11-07 00:44:45,447 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-11-07 00:44:45,450 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
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[2020-11-07 00:44:45,460 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-11-07 00:44:45,474 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-11-07 00:44:45,475 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf
[2020-11-07 00:44:45,502 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-11-07 00:44:45,502 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-11-07 00:44:45,507 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-11-07 00:44:45,508 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-11-07 00:44:45,508 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-11-07 00:44:45,508 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-11-07 00:44:45,508 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-11-07 00:44:45,509 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-11-07 00:44:45,509 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-11-07 00:44:45,509 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-11-07 00:44:45,510 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-11-07 00:44:45,511 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-11-07 00:44:45,511 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-11-07 00:44:45,511 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-11-07 00:44:45,511 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-11-07 00:44:45,512 INFO  L138        SettingsManager]:  * Size of a code block=SingleStatement
[2020-11-07 00:44:45,512 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-11-07 00:44:45,512 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-11-07 00:44:45,512 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-11-07 00:44:45,512 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-11-07 00:44:45,513 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=AcceleratedInterpolation
[2020-11-07 00:44:45,513 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-11-07 00:44:45,513 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$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[2020-11-07 00:44:45,961 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-11-07 00:44:46,013 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-11-07 00:44:46,018 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-11-07 00:44:46,020 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-11-07 00:44:46,021 INFO  L275        PluginConnector]: CDTParser initialized
[2020-11-07 00:44:46,022 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c
[2020-11-07 00:44:46,106 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fb26343f/a96bf848360d4d0bb5a962fa98f6f460/FLAGa52419a95
[2020-11-07 00:44:46,800 INFO  L306              CDTParser]: Found 1 translation units.
[2020-11-07 00:44:46,801 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c
[2020-11-07 00:44:46,810 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fb26343f/a96bf848360d4d0bb5a962fa98f6f460/FLAGa52419a95
[2020-11-07 00:44:47,108 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fb26343f/a96bf848360d4d0bb5a962fa98f6f460
[2020-11-07 00:44:47,111 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-11-07 00:44:47,119 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-11-07 00:44:47,121 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-11-07 00:44:47,121 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-11-07 00:44:47,125 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-11-07 00:44:47,126 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,130 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5712c473 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47, skipping insertion in model container
[2020-11-07 00:44:47,130 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,139 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-11-07 00:44:47,160 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-11-07 00:44:47,338 WARN  L1500              CHandler]: Possible shadowing of function min
[2020-11-07 00:44:47,341 WARN  L1500              CHandler]: Possible shadowing of function min
[2020-11-07 00:44:47,367 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-11-07 00:44:47,384 INFO  L203         MainTranslator]: Completed pre-run
[2020-11-07 00:44:47,405 WARN  L1500              CHandler]: Possible shadowing of function min
[2020-11-07 00:44:47,406 WARN  L1500              CHandler]: Possible shadowing of function min
[2020-11-07 00:44:47,429 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-11-07 00:44:47,457 INFO  L208         MainTranslator]: Completed translation
[2020-11-07 00:44:47,458 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47 WrapperNode
[2020-11-07 00:44:47,458 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-11-07 00:44:47,459 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-11-07 00:44:47,459 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-11-07 00:44:47,459 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-11-07 00:44:47,474 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,474 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,487 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,488 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,523 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,529 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,533 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (1/1) ...
[2020-11-07 00:44:47,537 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-11-07 00:44:47,539 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-11-07 00:44:47,539 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-11-07 00:44:47,539 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-11-07 00:44:47,540 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (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
[2020-11-07 00:44:47,619 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-11-07 00:44:47,619 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-11-07 00:44:47,619 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-11-07 00:44:47,619 INFO  L138     BoogieDeclarations]: Found implementation of procedure reach_error
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure nondet_tree
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure min
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_del
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_inorder
[2020-11-07 00:44:47,620 INFO  L138     BoogieDeclarations]: Found implementation of procedure size
[2020-11-07 00:44:47,621 INFO  L138     BoogieDeclarations]: Found implementation of procedure task
[2020-11-07 00:44:47,621 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-11-07 00:44:47,621 INFO  L138     BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit
[2020-11-07 00:44:47,621 INFO  L130     BoogieDeclarations]: Found specification of procedure calloc
[2020-11-07 00:44:47,621 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2020-11-07 00:44:47,622 INFO  L130     BoogieDeclarations]: Found specification of procedure free
[2020-11-07 00:44:47,622 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-11-07 00:44:47,622 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-11-07 00:44:47,622 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-11-07 00:44:47,622 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-11-07 00:44:47,623 INFO  L130     BoogieDeclarations]: Found specification of procedure __assert_fail
[2020-11-07 00:44:47,623 INFO  L130     BoogieDeclarations]: Found specification of procedure reach_error
[2020-11-07 00:44:47,623 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-11-07 00:44:47,623 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-11-07 00:44:47,623 INFO  L130     BoogieDeclarations]: Found specification of procedure nondet_tree
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure min
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-11-07 00:44:47,624 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_del
[2020-11-07 00:44:47,625 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-11-07 00:44:47,625 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-11-07 00:44:47,625 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_inorder
[2020-11-07 00:44:47,625 INFO  L130     BoogieDeclarations]: Found specification of procedure size
[2020-11-07 00:44:47,625 INFO  L130     BoogieDeclarations]: Found specification of procedure task
[2020-11-07 00:44:47,626 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.meminit
[2020-11-07 00:44:47,626 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-11-07 00:44:47,626 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-11-07 00:44:47,626 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2020-11-07 00:44:47,626 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-11-07 00:44:48,536 INFO  L293             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-11-07 00:44:48,536 INFO  L298             CfgBuilder]: Removed 1 assume(true) statements.
[2020-11-07 00:44:48,539 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:44:48 BoogieIcfgContainer
[2020-11-07 00:44:48,539 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-11-07 00:44:48,541 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-11-07 00:44:48,541 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-11-07 00:44:48,545 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-11-07 00:44:48,545 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:44:47" (1/3) ...
[2020-11-07 00:44:48,546 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22dc8642 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:44:48, skipping insertion in model container
[2020-11-07 00:44:48,547 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:44:47" (2/3) ...
[2020-11-07 00:44:48,547 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22dc8642 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:44:48, skipping insertion in model container
[2020-11-07 00:44:48,547 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:44:48" (3/3) ...
[2020-11-07 00:44:48,549 INFO  L111   eAbstractionObserver]: Analyzing ICFG tree_del_rec_incorrect.c
[2020-11-07 00:44:48,567 INFO  L179   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-11-07 00:44:48,572 INFO  L191   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-11-07 00:44:48,587 INFO  L253      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-11-07 00:44:48,615 INFO  L377      AbstractCegarLoop]: Interprodecural is true
[2020-11-07 00:44:48,616 INFO  L378      AbstractCegarLoop]: Hoare is true
[2020-11-07 00:44:48,616 INFO  L379      AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation
[2020-11-07 00:44:48,616 INFO  L380      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-11-07 00:44:48,616 INFO  L381      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-11-07 00:44:48,616 INFO  L382      AbstractCegarLoop]: Difference is false
[2020-11-07 00:44:48,616 INFO  L383      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-11-07 00:44:48,617 INFO  L387      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-11-07 00:44:48,640 INFO  L276                IsEmpty]: Start isEmpty. Operand 192 states.
[2020-11-07 00:44:48,657 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 67
[2020-11-07 00:44:48,657 INFO  L414         BasicCegarLoop]: Found error trace
[2020-11-07 00:44:48,658 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-11-07 00:44:48,659 INFO  L429      AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-11-07 00:44:48,666 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-11-07 00:44:48,666 INFO  L82        PathProgramCache]: Analyzing trace with hash 1227549006, now seen corresponding path program 1 times
[2020-11-07 00:44:48,677 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-11-07 00:44:48,677 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094076073]
[2020-11-07 00:44:48,678 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-11-07 00:44:48,770 INFO  L328   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-11-07 00:44:48,918 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,224 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-11-07 00:44:49,231 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,289 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-11-07 00:44:49,292 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,297 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20
[2020-11-07 00:44:49,299 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,303 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30
[2020-11-07 00:44:49,305 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,333 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39
[2020-11-07 00:44:49,336 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,409 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-11-07 00:44:49,411 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,452 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50
[2020-11-07 00:44:49,456 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:49,477 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-11-07 00:44:49,479 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094076073]
[2020-11-07 00:44:49,481 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-11-07 00:44:49,482 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11
[2020-11-07 00:44:49,482 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917317174]
[2020-11-07 00:44:49,489 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-11-07 00:44:49,489 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-11-07 00:44:49,505 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-11-07 00:44:49,507 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110
[2020-11-07 00:44:49,510 INFO  L87              Difference]: Start difference. First operand 192 states. Second operand 11 states.
[2020-11-07 00:44:51,089 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-11-07 00:44:51,089 INFO  L93              Difference]: Finished difference Result 334 states and 390 transitions.
[2020-11-07 00:44:51,090 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-11-07 00:44:51,091 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 66
[2020-11-07 00:44:51,092 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-11-07 00:44:51,108 INFO  L225             Difference]: With dead ends: 334
[2020-11-07 00:44:51,109 INFO  L226             Difference]: Without dead ends: 194
[2020-11-07 00:44:51,116 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306
[2020-11-07 00:44:51,138 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 194 states.
[2020-11-07 00:44:51,203 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 181.
[2020-11-07 00:44:51,205 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 181 states.
[2020-11-07 00:44:51,208 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 204 transitions.
[2020-11-07 00:44:51,211 INFO  L78                 Accepts]: Start accepts. Automaton has 181 states and 204 transitions. Word has length 66
[2020-11-07 00:44:51,211 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-11-07 00:44:51,212 INFO  L481      AbstractCegarLoop]: Abstraction has 181 states and 204 transitions.
[2020-11-07 00:44:51,212 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-11-07 00:44:51,212 INFO  L276                IsEmpty]: Start isEmpty. Operand 181 states and 204 transitions.
[2020-11-07 00:44:51,217 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 87
[2020-11-07 00:44:51,217 INFO  L414         BasicCegarLoop]: Found error trace
[2020-11-07 00:44:51,218 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 2, 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, 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, 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, 1]
[2020-11-07 00:44:51,218 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-11-07 00:44:51,218 INFO  L429      AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-11-07 00:44:51,219 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-11-07 00:44:51,219 INFO  L82        PathProgramCache]: Analyzing trace with hash -1622442284, now seen corresponding path program 1 times
[2020-11-07 00:44:51,219 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-11-07 00:44:51,220 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488319840]
[2020-11-07 00:44:51,220 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-11-07 00:44:51,224 INFO  L328   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-11-07 00:44:51,248 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,352 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-11-07 00:44:51,355 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,382 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-11-07 00:44:51,387 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,423 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20
[2020-11-07 00:44:51,425 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,432 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30
[2020-11-07 00:44:51,444 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,502 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3
[2020-11-07 00:44:51,505 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,509 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-11-07 00:44:51,511 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,517 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59
[2020-11-07 00:44:51,518 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,540 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65
[2020-11-07 00:44:51,542 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,569 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70
[2020-11-07 00:44:51,572 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:51,616 INFO  L134       CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked.
[2020-11-07 00:44:51,617 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488319840]
[2020-11-07 00:44:51,617 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-11-07 00:44:51,617 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12
[2020-11-07 00:44:51,617 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42892670]
[2020-11-07 00:44:51,619 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-11-07 00:44:51,619 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-11-07 00:44:51,620 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-11-07 00:44:51,620 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2020-11-07 00:44:51,620 INFO  L87              Difference]: Start difference. First operand 181 states and 204 transitions. Second operand 12 states.
[2020-11-07 00:44:53,365 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-11-07 00:44:53,366 INFO  L93              Difference]: Finished difference Result 323 states and 368 transitions.
[2020-11-07 00:44:53,367 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-11-07 00:44:53,367 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 86
[2020-11-07 00:44:53,368 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-11-07 00:44:53,377 INFO  L225             Difference]: With dead ends: 323
[2020-11-07 00:44:53,377 INFO  L226             Difference]: Without dead ends: 193
[2020-11-07 00:44:53,385 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380
[2020-11-07 00:44:53,387 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 193 states.
[2020-11-07 00:44:53,441 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 183.
[2020-11-07 00:44:53,442 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 183 states.
[2020-11-07 00:44:53,444 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 207 transitions.
[2020-11-07 00:44:53,444 INFO  L78                 Accepts]: Start accepts. Automaton has 183 states and 207 transitions. Word has length 86
[2020-11-07 00:44:53,445 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-11-07 00:44:53,445 INFO  L481      AbstractCegarLoop]: Abstraction has 183 states and 207 transitions.
[2020-11-07 00:44:53,445 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-11-07 00:44:53,445 INFO  L276                IsEmpty]: Start isEmpty. Operand 183 states and 207 transitions.
[2020-11-07 00:44:53,447 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 108
[2020-11-07 00:44:53,447 INFO  L414         BasicCegarLoop]: Found error trace
[2020-11-07 00:44:53,448 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-11-07 00:44:53,448 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-11-07 00:44:53,448 INFO  L429      AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-11-07 00:44:53,449 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-11-07 00:44:53,449 INFO  L82        PathProgramCache]: Analyzing trace with hash -1316397024, now seen corresponding path program 1 times
[2020-11-07 00:44:53,450 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-11-07 00:44:53,450 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641959755]
[2020-11-07 00:44:53,450 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-11-07 00:44:53,454 INFO  L328   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-11-07 00:44:53,476 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,564 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-11-07 00:44:53,569 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,601 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-11-07 00:44:53,614 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,730 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7
[2020-11-07 00:44:53,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,737 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-11-07 00:44:53,740 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,747 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-11-07 00:44:53,750 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,783 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-11-07 00:44:53,788 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,794 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3
[2020-11-07 00:44:53,795 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,798 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-11-07 00:44:53,799 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,801 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 80
[2020-11-07 00:44:53,803 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,827 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 86
[2020-11-07 00:44:53,829 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,854 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91
[2020-11-07 00:44:53,857 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:53,880 INFO  L134       CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked.
[2020-11-07 00:44:53,881 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641959755]
[2020-11-07 00:44:53,882 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-11-07 00:44:53,882 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14
[2020-11-07 00:44:53,882 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058777422]
[2020-11-07 00:44:53,883 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-11-07 00:44:53,883 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-11-07 00:44:53,884 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-11-07 00:44:53,884 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182
[2020-11-07 00:44:53,884 INFO  L87              Difference]: Start difference. First operand 183 states and 207 transitions. Second operand 14 states.
[2020-11-07 00:44:55,656 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-11-07 00:44:55,656 INFO  L93              Difference]: Finished difference Result 322 states and 367 transitions.
[2020-11-07 00:44:55,657 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. 
[2020-11-07 00:44:55,657 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 107
[2020-11-07 00:44:55,658 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-11-07 00:44:55,660 INFO  L225             Difference]: With dead ends: 322
[2020-11-07 00:44:55,660 INFO  L226             Difference]: Without dead ends: 195
[2020-11-07 00:44:55,662 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600
[2020-11-07 00:44:55,663 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 195 states.
[2020-11-07 00:44:55,710 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 185.
[2020-11-07 00:44:55,710 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 185 states.
[2020-11-07 00:44:55,713 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 210 transitions.
[2020-11-07 00:44:55,713 INFO  L78                 Accepts]: Start accepts. Automaton has 185 states and 210 transitions. Word has length 107
[2020-11-07 00:44:55,714 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-11-07 00:44:55,714 INFO  L481      AbstractCegarLoop]: Abstraction has 185 states and 210 transitions.
[2020-11-07 00:44:55,714 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-11-07 00:44:55,714 INFO  L276                IsEmpty]: Start isEmpty. Operand 185 states and 210 transitions.
[2020-11-07 00:44:55,717 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 131
[2020-11-07 00:44:55,717 INFO  L414         BasicCegarLoop]: Found error trace
[2020-11-07 00:44:55,717 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1]
[2020-11-07 00:44:55,718 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-11-07 00:44:55,718 INFO  L429      AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-11-07 00:44:55,718 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-11-07 00:44:55,719 INFO  L82        PathProgramCache]: Analyzing trace with hash -1259421689, now seen corresponding path program 1 times
[2020-11-07 00:44:55,719 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-11-07 00:44:55,719 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830322736]
[2020-11-07 00:44:55,719 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-11-07 00:44:55,723 INFO  L328   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-11-07 00:44:55,757 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:55,919 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-11-07 00:44:55,923 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:55,955 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12
[2020-11-07 00:44:55,968 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,054 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7
[2020-11-07 00:44:56,058 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,063 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15
[2020-11-07 00:44:56,069 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,086 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-11-07 00:44:56,103 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,186 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3
[2020-11-07 00:44:56,188 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,191 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14
[2020-11-07 00:44:56,193 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,204 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 74
[2020-11-07 00:44:56,209 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,215 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3
[2020-11-07 00:44:56,216 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,218 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-11-07 00:44:56,219 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,222 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103
[2020-11-07 00:44:56,224 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,243 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109
[2020-11-07 00:44:56,246 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,279 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 114
[2020-11-07 00:44:56,281 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-11-07 00:44:56,359 INFO  L134       CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked.
[2020-11-07 00:44:56,360 INFO  L353   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1830322736]
[2020-11-07 00:44:56,360 INFO  L219   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-11-07 00:44:56,360 INFO  L232   FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17
[2020-11-07 00:44:56,360 INFO  L155   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953054506]
[2020-11-07 00:44:56,361 INFO  L461      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-11-07 00:44:56,361 INFO  L142   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-11-07 00:44:56,362 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-11-07 00:44:56,362 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272
[2020-11-07 00:44:56,362 INFO  L87              Difference]: Start difference. First operand 185 states and 210 transitions. Second operand 17 states.
[2020-11-07 00:44:58,599 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-11-07 00:44:58,600 INFO  L93              Difference]: Finished difference Result 305 states and 346 transitions.
[2020-11-07 00:44:58,600 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2020-11-07 00:44:58,600 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 130
[2020-11-07 00:44:58,602 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-11-07 00:44:58,605 INFO  L225             Difference]: With dead ends: 305
[2020-11-07 00:44:58,605 INFO  L226             Difference]: Without dead ends: 195
[2020-11-07 00:44:58,607 INFO  L677         BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056
[2020-11-07 00:44:58,608 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 195 states.
[2020-11-07 00:44:58,670 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 187.
[2020-11-07 00:44:58,670 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 187 states.
[2020-11-07 00:44:58,672 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 213 transitions.
[2020-11-07 00:44:58,673 INFO  L78                 Accepts]: Start accepts. Automaton has 187 states and 213 transitions. Word has length 130
[2020-11-07 00:44:58,673 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-11-07 00:44:58,673 INFO  L481      AbstractCegarLoop]: Abstraction has 187 states and 213 transitions.
[2020-11-07 00:44:58,674 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-11-07 00:44:58,674 INFO  L276                IsEmpty]: Start isEmpty. Operand 187 states and 213 transitions.
[2020-11-07 00:44:58,677 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 163
[2020-11-07 00:44:58,677 INFO  L414         BasicCegarLoop]: Found error trace
[2020-11-07 00:44:58,677 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-11-07 00:44:58,678 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-11-07 00:44:58,678 INFO  L429      AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-11-07 00:44:58,678 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-11-07 00:44:58,678 INFO  L82        PathProgramCache]: Analyzing trace with hash -1639938800, now seen corresponding path program 1 times
[2020-11-07 00:44:58,679 INFO  L162   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-11-07 00:44:58,679 INFO  L353   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420382727]
[2020-11-07 00:44:58,679 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-11-07 00:44:58,682 INFO  L328   leratedInterpolation]: No loops in this trace, falling back to nested interpolation
[2020-11-07 00:44:58,741 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-11-07 00:44:58,741 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-11-07 00:44:58,801 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-11-07 00:44:58,802 INFO  L221             TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-11-07 00:44:58,892 INFO  L173   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-11-07 00:44:58,892 INFO  L523         BasicCegarLoop]: Counterexample might be feasible
[2020-11-07 00:44:58,895 WARN  L518      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-11-07 00:44:58,938 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 12:44:58 BoogieIcfgContainer
[2020-11-07 00:44:58,938 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-11-07 00:44:58,944 INFO  L168              Benchmark]: Toolchain (without parser) took 11826.73 ms. Allocated memory was 158.3 MB in the beginning and 275.8 MB in the end (delta: 117.4 MB). Free memory was 134.4 MB in the beginning and 227.0 MB in the end (delta: -92.6 MB). Peak memory consumption was 25.1 MB. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,946 INFO  L168              Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 158.3 MB. Free memory is still 134.4 MB. There was no memory consumed. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,951 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 337.49 ms. Allocated memory is still 158.3 MB. Free memory was 133.7 MB in the beginning and 122.1 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,957 INFO  L168              Benchmark]: Boogie Preprocessor took 78.49 ms. Allocated memory is still 158.3 MB. Free memory was 122.1 MB in the beginning and 120.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,958 INFO  L168              Benchmark]: RCFGBuilder took 1000.57 ms. Allocated memory is still 158.3 MB. Free memory was 120.0 MB in the beginning and 133.7 MB in the end (delta: -13.7 MB). Peak memory consumption was 38.2 MB. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,959 INFO  L168              Benchmark]: TraceAbstraction took 10397.38 ms. Allocated memory was 158.3 MB in the beginning and 275.8 MB in the end (delta: 117.4 MB). Free memory was 133.2 MB in the beginning and 227.0 MB in the end (delta: -93.8 MB). Peak memory consumption was 23.6 MB. Max. memory is 8.0 GB.
[2020-11-07 00:44:58,964 INFO  L339   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.21 ms. Allocated memory is still 158.3 MB. Free memory is still 134.4 MB. There was no memory consumed. Max. memory is 8.0 GB.
 * CACSL2BoogieTranslator took 337.49 ms. Allocated memory is still 158.3 MB. Free memory was 133.7 MB in the beginning and 122.1 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB.
 * Boogie Preprocessor took 78.49 ms. Allocated memory is still 158.3 MB. Free memory was 122.1 MB in the beginning and 120.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB.
 * RCFGBuilder took 1000.57 ms. Allocated memory is still 158.3 MB. Free memory was 120.0 MB in the beginning and 133.7 MB in the end (delta: -13.7 MB). Peak memory consumption was 38.2 MB. Max. memory is 8.0 GB.
 * TraceAbstraction took 10397.38 ms. Allocated memory was 158.3 MB in the beginning and 275.8 MB in the end (delta: 117.4 MB). Free memory was 133.2 MB in the beginning and 227.0 MB in the end (delta: -93.8 MB). Peak memory consumption was 23.6 MB. Max. memory is 8.0 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L98]  CALL, EXPR   nondet_tree()
[L25]  COND FALSE   !(__VERIFIER_nondet_bool())
[L28]               struct node *n = (struct node *)malloc(sizeof(struct node));
[L29]               n->data = __VERIFIER_nondet_int()
[L30]  CALL, EXPR   nondet_tree()
[L25]  COND TRUE    __VERIFIER_nondet_bool()
[L26]               return 0;
[L30]  RET, EXPR    nondet_tree()
[L30]               n->left = nondet_tree()
[L31]  CALL, EXPR   nondet_tree()
[L25]  COND TRUE    __VERIFIER_nondet_bool()
[L26]               return 0;
[L31]  RET, EXPR    nondet_tree()
[L31]               n->right = nondet_tree()
[L32]               return n;
[L98]  RET, EXPR    nondet_tree()
[L98]  CALL         task(nondet_tree())
[L76]  CALL, EXPR   min(t)
[L37]  COND FALSE   !(!n)
[L40]  EXPR         n->left
[L40]  CALL, EXPR   min(n->left)
[L37]  COND TRUE    !n
[L38]               return 2147483647;
[L40]  RET, EXPR    min(n->left)
[L40]               int a = min(n->left);
[L41]  EXPR         n->right
[L41]  CALL, EXPR   min(n->right)
[L37]  COND TRUE    !n
[L38]               return 2147483647;
[L41]  RET, EXPR    min(n->right)
[L41]               int b = min(n->right);
[L42]  COND TRUE    a <= b
[L42]               return a;
[L76]  RET, EXPR    min(t)
[L76]               int a = min(t);
[L77]               int b;
[L79]  CALL, EXPR   size(t)
[L71]  COND FALSE   !(!t)
[L72]  EXPR         t->left
[L72]  CALL, EXPR   size(t->left)
[L71]  COND TRUE    !t
[L71]               return 0;
[L72]  RET, EXPR    size(t->left)
[L72]  EXPR         t->right
[L72]  CALL, EXPR   size(t->right)
[L71]  COND TRUE    !t
[L71]               return 0;
[L72]  RET, EXPR    size(t->right)
[L72]               return size(t->left) + size(t->right) + 1;
[L79]  RET, EXPR    size(t)
[L79]               int n = size(t);
[L80]  CALL         assume_abort_if_not(n != 0)
[L10]  COND FALSE   !(!cond)
[L80]  RET          assume_abort_if_not(n != 0)
[L81]  EXPR, FCALL  calloc(n, sizeof(int))
[L81]               int *x = calloc(n, sizeof(int));
[L82]  CALL         tree_inorder(t, x, n)
[L60]  COND FALSE   !(!t)
[L63]  EXPR         t->left
[L63]  CALL, EXPR   tree_inorder(t->left,  a, i)
[L60]  COND TRUE    !t
[L61]               return i;
[L63]  RET, EXPR    tree_inorder(t->left,  a, i)
[L63]               i = tree_inorder(t->left,  a, i)
[L64]  EXPR         i++
[L64]  EXPR         t->data
[L64]               a[i++] = t->data
[L65]  EXPR         t->right
[L65]  CALL, EXPR   tree_inorder(t->right, a, i)
[L60]  COND TRUE    !t
[L61]               return i;
[L65]  RET, EXPR    tree_inorder(t->right, a, i)
[L65]               i = tree_inorder(t->right, a, i)
[L66]               return i;
[L82]  RET          tree_inorder(t, x, n)
[L83]  EXPR         x[0]
[L83]  CALL         __VERIFIER_assert(a == x[0])
[L16]  COND TRUE    !cond
[L16]  CALL         reach_error()
[L14]               __assert_fail("0", "tree_del_rec_incorrect.c", 14, "reach_error")

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 13 procedures, 192 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 10.2s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 7.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 678 SDtfs, 1570 SDslu, 2443 SDs, 0 SdLazy, 4247 SolverSat, 657 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 163 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=192occurred 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: 0.2s AutomataMinimizationTime, 4 MinimizatonAttempts, 41 StatesRemovedByMinimization, 4 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...