/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 [2020-11-07 00:44:45,391 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 00:44:45,393 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 00:44:45,394 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 00:44:45,395 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 00:44:45,399 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 00:44:45,401 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [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 00:44:45,460 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 00:44:45,473 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [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...