/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 03:56:36,454 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 03:56:36,456 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 03:56:36,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 03:56:36,468 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 03:56:36,469 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 03:56:36,472 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 03:56:36,475 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 03:56:36,479 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 03:56:36,479 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 03:56:36,484 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 03:56:36,485 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 03:56:36,486 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 03:56:36,487 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 03:56:36,491 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 03:56:36,492 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 03:56:36,494 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 03:56:36,495 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 03:56:36,500 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 03:56:36,503 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 03:56:36,506 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 03:56:36,507 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 03:56:36,508 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 03:56:36,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 03:56:36,511 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 03:56:36,511 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 03:56:36,511 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 03:56:36,512 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 03:56:36,512 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 03:56:36,513 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 03:56:36,513 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 03:56:36,514 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 03:56:36,515 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 03:56:36,515 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 03:56:36,516 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 03:56:36,516 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 03:56:36,519 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 03:56:36,520 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 03:56:36,520 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 03:56:36,521 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 03:56:36,524 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 03:56:36,525 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-07 03:56:36,545 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 03:56:36,545 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 03:56:36,547 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 03:56:36,547 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 03:56:36,547 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 03:56:36,547 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 03:56:36,547 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 03:56:36,548 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 03:56:36,548 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 03:56:36,548 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 03:56:36,548 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 03:56:36,549 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 03:56:36,550 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 03:56:36,550 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 03:56:36,550 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 03:56:36,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 03:56:36,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 03:56:36,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 03:56:36,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 03:56:36,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 03:56:36,551 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 03:56:36,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 03:56:36,552 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 03:56:36,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 03:56:36,858 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 03:56:36,879 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 03:56:36,883 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 03:56:36,884 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 03:56:36,885 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 03:56:36,885 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-11-07 03:56:36,962 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de9fd9dcd/5e7cc6a4fb1043b59c1960a33a8800d1/FLAGbd40dccc7 [2019-11-07 03:56:37,554 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 03:56:37,555 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-11-07 03:56:37,576 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de9fd9dcd/5e7cc6a4fb1043b59c1960a33a8800d1/FLAGbd40dccc7 [2019-11-07 03:56:37,806 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/de9fd9dcd/5e7cc6a4fb1043b59c1960a33a8800d1 [2019-11-07 03:56:37,814 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 03:56:37,816 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 03:56:37,817 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 03:56:37,817 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 03:56:37,820 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 03:56:37,821 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 03:56:37" (1/1) ... [2019-11-07 03:56:37,824 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@682403da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:37, skipping insertion in model container [2019-11-07 03:56:37,825 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 03:56:37" (1/1) ... [2019-11-07 03:56:37,832 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 03:56:37,889 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 03:56:38,298 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 03:56:38,307 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 03:56:38,353 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 03:56:38,405 INFO L192 MainTranslator]: Completed translation [2019-11-07 03:56:38,405 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38 WrapperNode [2019-11-07 03:56:38,406 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 03:56:38,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 03:56:38,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 03:56:38,407 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 03:56:38,419 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,436 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,437 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,463 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (1/1) ... [2019-11-07 03:56:38,469 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 03:56:38,470 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 03:56:38,470 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 03:56:38,470 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 03:56:38,471 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (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 [2019-11-07 03:56:38,531 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 03:56:38,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 03:56:38,532 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-11-07 03:56:38,532 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-11-07 03:56:38,532 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2019-11-07 03:56:38,532 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2019-11-07 03:56:38,533 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2019-11-07 03:56:38,533 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2019-11-07 03:56:38,533 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 03:56:38,533 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 03:56:38,533 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-11-07 03:56:38,534 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-11-07 03:56:38,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-11-07 03:56:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-11-07 03:56:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-11-07 03:56:38,538 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-11-07 03:56:38,539 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-11-07 03:56:38,540 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-11-07 03:56:38,541 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-11-07 03:56:38,541 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-11-07 03:56:38,541 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-11-07 03:56:38,541 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-11-07 03:56:38,541 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-11-07 03:56:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-11-07 03:56:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-11-07 03:56:38,544 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-11-07 03:56:38,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-11-07 03:56:38,546 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-11-07 03:56:38,547 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-11-07 03:56:38,548 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-11-07 03:56:38,549 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-07 03:56:38,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 03:56:38,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 03:56:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-11-07 03:56:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 03:56:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 03:56:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 03:56:38,920 INFO L688 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2019-11-07 03:56:39,252 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 03:56:39,252 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-07 03:56:39,254 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 03:56:39 BoogieIcfgContainer [2019-11-07 03:56:39,254 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 03:56:39,255 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 03:56:39,255 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 03:56:39,258 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 03:56:39,259 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 03:56:37" (1/3) ... [2019-11-07 03:56:39,260 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dd50125 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 03:56:39, skipping insertion in model container [2019-11-07 03:56:39,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 03:56:38" (2/3) ... [2019-11-07 03:56:39,260 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dd50125 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 03:56:39, skipping insertion in model container [2019-11-07 03:56:39,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 03:56:39" (3/3) ... [2019-11-07 03:56:39,262 INFO L109 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2019-11-07 03:56:39,272 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 03:56:39,281 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 03:56:39,293 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 03:56:39,315 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 03:56:39,316 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 03:56:39,316 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 03:56:39,316 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 03:56:39,316 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 03:56:39,316 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 03:56:39,317 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 03:56:39,317 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 03:56:39,331 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-11-07 03:56:39,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 03:56:39,338 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:56:39,339 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:56:39,341 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:56:39,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:56:39,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1503477050, now seen corresponding path program 1 times [2019-11-07 03:56:39,357 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:56:39,358 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931022002] [2019-11-07 03:56:39,358 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:56:39,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:39,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:56:39,557 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931022002] [2019-11-07 03:56:39,558 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:56:39,558 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-07 03:56:39,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178139187] [2019-11-07 03:56:39,564 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 03:56:39,564 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:56:39,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 03:56:39,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-07 03:56:39,582 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 4 states. [2019-11-07 03:56:39,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:56:39,651 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2019-11-07 03:56:39,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 03:56:39,653 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-07 03:56:39,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:56:39,681 INFO L225 Difference]: With dead ends: 52 [2019-11-07 03:56:39,681 INFO L226 Difference]: Without dead ends: 28 [2019-11-07 03:56:39,684 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-07 03:56:39,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-07 03:56:39,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-11-07 03:56:39,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-07 03:56:39,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-11-07 03:56:39,732 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 13 [2019-11-07 03:56:39,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:56:39,732 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-11-07 03:56:39,732 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 03:56:39,733 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-11-07 03:56:39,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 03:56:39,734 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:56:39,734 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:56:39,734 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:56:39,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:56:39,735 INFO L82 PathProgramCache]: Analyzing trace with hash -886044635, now seen corresponding path program 1 times [2019-11-07 03:56:39,735 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:56:39,735 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954668134] [2019-11-07 03:56:39,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:56:39,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:39,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:56:39,861 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954668134] [2019-11-07 03:56:39,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496277054] [2019-11-07 03:56:39,862 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:56:40,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:40,016 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 03:56:40,026 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:56:40,065 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 03:56:40,065 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 03:56:40,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 03:56:40,169 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 03:56:40,169 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 10 [2019-11-07 03:56:40,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13466521] [2019-11-07 03:56:40,172 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-07 03:56:40,176 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:56:40,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-07 03:56:40,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-11-07 03:56:40,177 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 7 states. [2019-11-07 03:56:40,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:56:40,241 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2019-11-07 03:56:40,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 03:56:40,242 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-11-07 03:56:40,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:56:40,243 INFO L225 Difference]: With dead ends: 45 [2019-11-07 03:56:40,243 INFO L226 Difference]: Without dead ends: 29 [2019-11-07 03:56:40,244 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2019-11-07 03:56:40,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-07 03:56:40,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-11-07 03:56:40,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-07 03:56:40,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-11-07 03:56:40,250 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 20 [2019-11-07 03:56:40,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:56:40,253 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-11-07 03:56:40,253 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-07 03:56:40,253 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-11-07 03:56:40,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-07 03:56:40,254 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:56:40,254 INFO L410 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] [2019-11-07 03:56:40,455 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:56:40,455 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:56:40,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:56:40,456 INFO L82 PathProgramCache]: Analyzing trace with hash -497001908, now seen corresponding path program 1 times [2019-11-07 03:56:40,456 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:56:40,456 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112005270] [2019-11-07 03:56:40,456 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:56:40,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:40,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 03:56:40,623 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112005270] [2019-11-07 03:56:40,623 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 03:56:40,623 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-07 03:56:40,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765792015] [2019-11-07 03:56:40,624 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 03:56:40,625 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:56:40,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 03:56:40,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-07 03:56:40,626 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-11-07 03:56:40,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:56:40,789 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2019-11-07 03:56:40,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 03:56:40,790 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-11-07 03:56:40,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:56:40,791 INFO L225 Difference]: With dead ends: 40 [2019-11-07 03:56:40,792 INFO L226 Difference]: Without dead ends: 27 [2019-11-07 03:56:40,792 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-11-07 03:56:40,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-07 03:56:40,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-07 03:56:40,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-07 03:56:40,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-07 03:56:40,798 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2019-11-07 03:56:40,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:56:40,798 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-07 03:56:40,798 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 03:56:40,799 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-07 03:56:40,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-07 03:56:40,799 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:56:40,800 INFO L410 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] [2019-11-07 03:56:40,800 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:56:40,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:56:40,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1275364761, now seen corresponding path program 1 times [2019-11-07 03:56:40,801 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:56:40,801 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287846023] [2019-11-07 03:56:40,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:56:40,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:40,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 03:56:40,913 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287846023] [2019-11-07 03:56:40,913 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721352333] [2019-11-07 03:56:40,914 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:56:41,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:41,069 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 03:56:41,073 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:56:41,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 03:56:41,084 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 03:56:41,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 03:56:41,184 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1864030102] [2019-11-07 03:56:41,215 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2019-11-07 03:56:41,215 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 03:56:41,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 03:56:41,238 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 03:56:41,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 03:56:41,393 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 03:56:41,575 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:41,937 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:42,235 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:42,796 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:42,808 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:42,949 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:42,959 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:43,570 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:43,577 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:43,712 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2019-11-07 03:56:48,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 03:56:48,825 INFO L197 IcfgInterpreter]: Interpreting procedure dll_remove_last with input of size 35 for LOIs [2019-11-07 03:56:48,841 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 03:56:49,124 WARN L191 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 42 [2019-11-07 03:56:49,747 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2019-11-07 03:56:49,942 WARN L191 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2019-11-07 03:56:50,123 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2019-11-07 03:56:50,125 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-11-07 03:56:50,125 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9, 6, 6] total 25 [2019-11-07 03:56:50,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711265] [2019-11-07 03:56:50,126 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-07 03:56:50,127 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:56:50,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-07 03:56:50,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2019-11-07 03:56:50,128 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 16 states. [2019-11-07 03:56:51,034 WARN L191 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 61 [2019-11-07 03:56:51,215 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 66 [2019-11-07 03:56:51,497 WARN L191 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 76 [2019-11-07 03:56:51,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:56:51,676 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2019-11-07 03:56:51,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-07 03:56:51,677 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2019-11-07 03:56:51,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:56:51,680 INFO L225 Difference]: With dead ends: 48 [2019-11-07 03:56:51,680 INFO L226 Difference]: Without dead ends: 35 [2019-11-07 03:56:51,681 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=146, Invalid=1044, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 03:56:51,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-07 03:56:51,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-11-07 03:56:51,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 03:56:51,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-11-07 03:56:51,689 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 26 [2019-11-07 03:56:51,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:56:51,690 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-11-07 03:56:51,690 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-07 03:56:51,690 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-11-07 03:56:51,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-07 03:56:51,692 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:56:51,692 INFO L410 BasicCegarLoop]: trace histogram [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] [2019-11-07 03:56:51,893 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:56:51,896 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:56:51,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:56:51,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1313247650, now seen corresponding path program 1 times [2019-11-07 03:56:51,897 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:56:51,897 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186959325] [2019-11-07 03:56:51,897 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:56:51,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:52,063 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 03:56:52,063 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186959325] [2019-11-07 03:56:52,064 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347501204] [2019-11-07 03:56:52,064 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:56:52,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:56:52,187 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 03:56:52,189 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:56:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 03:56:52,195 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 03:56:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 03:56:52,262 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059696792] [2019-11-07 03:56:52,265 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2019-11-07 03:56:52,265 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 03:56:52,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 03:56:52,266 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 03:56:52,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 03:56:52,290 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-11-07 03:56:52,355 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:52,573 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:52,958 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:53,236 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:53,299 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:53,336 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:53,392 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-11-07 03:56:54,218 INFO L197 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2019-11-07 03:56:59,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 03:56:59,122 INFO L197 IcfgInterpreter]: Interpreting procedure dll_remove_last with input of size 13 for LOIs [2019-11-07 03:56:59,179 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 03:56:59,949 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 03:56:59,949 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6, 17] total 27 [2019-11-07 03:56:59,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492148589] [2019-11-07 03:56:59,950 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-07 03:56:59,951 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:56:59,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-07 03:56:59,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=625, Unknown=1, NotChecked=0, Total=702 [2019-11-07 03:56:59,952 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 27 states. [2019-11-07 03:57:01,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:57:01,437 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2019-11-07 03:57:01,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-07 03:57:01,438 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 28 [2019-11-07 03:57:01,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:57:01,440 INFO L225 Difference]: With dead ends: 61 [2019-11-07 03:57:01,440 INFO L226 Difference]: Without dead ends: 40 [2019-11-07 03:57:01,442 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=227, Invalid=1934, Unknown=1, NotChecked=0, Total=2162 [2019-11-07 03:57:01,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-07 03:57:01,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2019-11-07 03:57:01,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-07 03:57:01,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-11-07 03:57:01,451 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 28 [2019-11-07 03:57:01,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:57:01,451 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-11-07 03:57:01,451 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-07 03:57:01,451 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-11-07 03:57:01,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-07 03:57:01,452 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:57:01,453 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:57:01,653 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:57:01,654 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:57:01,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:57:01,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1145109181, now seen corresponding path program 2 times [2019-11-07 03:57:01,655 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:57:01,655 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891137922] [2019-11-07 03:57:01,655 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:57:01,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:57:02,337 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 03:57:02,338 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891137922] [2019-11-07 03:57:02,338 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063285797] [2019-11-07 03:57:02,338 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:57:02,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 03:57:02,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 03:57:02,465 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 37 conjunts are in the unsatisfiable core [2019-11-07 03:57:02,468 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:57:02,849 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 03:57:02,849 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 03:57:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-07 03:57:03,019 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 03:57:03,019 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [17] total 24 [2019-11-07 03:57:03,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827122341] [2019-11-07 03:57:03,020 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-07 03:57:03,020 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 03:57:03,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-07 03:57:03,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=501, Unknown=0, NotChecked=0, Total=552 [2019-11-07 03:57:03,021 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2019-11-07 03:57:03,314 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 79 [2019-11-07 03:57:03,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 03:57:03,374 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2019-11-07 03:57:03,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 03:57:03,374 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2019-11-07 03:57:03,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 03:57:03,375 INFO L225 Difference]: With dead ends: 52 [2019-11-07 03:57:03,376 INFO L226 Difference]: Without dead ends: 39 [2019-11-07 03:57:03,376 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=64, Invalid=586, Unknown=0, NotChecked=0, Total=650 [2019-11-07 03:57:03,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-07 03:57:03,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2019-11-07 03:57:03,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-07 03:57:03,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2019-11-07 03:57:03,384 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 41 [2019-11-07 03:57:03,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 03:57:03,385 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2019-11-07 03:57:03,385 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-07 03:57:03,385 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2019-11-07 03:57:03,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-07 03:57:03,386 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 03:57:03,387 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 03:57:03,591 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:57:03,592 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 03:57:03,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 03:57:03,593 INFO L82 PathProgramCache]: Analyzing trace with hash -483568520, now seen corresponding path program 3 times [2019-11-07 03:57:03,593 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 03:57:03,593 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728246288] [2019-11-07 03:57:03,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 03:57:03,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 03:57:04,511 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-07 03:57:04,511 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728246288] [2019-11-07 03:57:04,511 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684932888] [2019-11-07 03:57:04,511 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 03:57:04,651 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 03:57:04,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 03:57:04,653 INFO L256 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 67 conjunts are in the unsatisfiable core [2019-11-07 03:57:04,662 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 03:57:15,943 WARN L191 SmtUtils]: Spent 5.54 s on a formula simplification that was a NOOP. DAG size: 34 [2019-11-07 03:57:17,968 WARN L860 $PredicateComparison]: unable to prove that (let ((.cse2 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|)) (.cse3 (+ (select (select |c_old(#memory_$Pointer$.offset)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|) 4))) (or (and (exists ((dll_remove_last_~snd_to_last~0.offset Int)) (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|)) (.cse1 (+ dll_remove_last_~snd_to_last~0.offset 4))) (and (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| .cse0 (store (select |c_old(#memory_$Pointer$.offset)| .cse0) .cse1 0))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) .cse1 0)))))) (not (= 0 (select (select |c_old(#memory_$Pointer$.offset)| .cse2) .cse3)))) (and (not (= 0 (select (select |c_old(#memory_$Pointer$.base)| .cse2) .cse3))) (exists ((v_prenex_39 Int)) (let ((.cse4 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|)) (.cse5 (+ v_prenex_39 4))) (and (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| .cse4 (store (select |c_old(#memory_$Pointer$.base)| .cse4) .cse5 0))) (= (store |c_old(#memory_$Pointer$.offset)| .cse4 (store (select |c_old(#memory_$Pointer$.offset)| .cse4) .cse5 0)) |c_#memory_$Pointer$.offset|))))))) is different from true [2019-11-07 03:57:18,132 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 44 [2019-11-07 03:57:18,299 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 43 [2019-11-07 03:57:18,675 WARN L191 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 52 [2019-11-07 03:57:18,870 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 1 not checked. [2019-11-07 03:57:18,870 INFO L321 TraceCheckSpWp]: Computing backward predicates...