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 0.1.24-13a467a-m [2019-10-15 02:59:46,063 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 02:59:46,065 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 02:59:46,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 02:59:46,077 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 02:59:46,078 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 02:59:46,080 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 02:59:46,081 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 02:59:46,083 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 02:59:46,084 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 02:59:46,085 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 02:59:46,086 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 02:59:46,086 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 02:59:46,087 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 02:59:46,088 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 02:59:46,089 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 02:59:46,090 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 02:59:46,091 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 02:59:46,092 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 02:59:46,094 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 02:59:46,098 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 02:59:46,099 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 02:59:46,101 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 02:59:46,102 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 02:59:46,107 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 02:59:46,108 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 02:59:46,108 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 02:59:46,109 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 02:59:46,109 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 02:59:46,110 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 02:59:46,111 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 02:59:46,112 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 02:59:46,112 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 02:59:46,114 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 02:59:46,117 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 02:59:46,117 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 02:59:46,118 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 02:59:46,118 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 02:59:46,118 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 02:59:46,120 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 02:59:46,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 02:59:46,124 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 [2019-10-15 02:59:46,143 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 02:59:46,143 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 02:59:46,144 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 02:59:46,145 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 02:59:46,145 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 02:59:46,145 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 02:59:46,145 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 02:59:46,145 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 02:59:46,146 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 02:59:46,146 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 02:59:46,147 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 02:59:46,147 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 02:59:46,147 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 02:59:46,148 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 02:59:46,148 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 02:59:46,148 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 02:59:46,148 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 02:59:46,148 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 02:59:46,149 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 02:59:46,149 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 02:59:46,149 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 02:59:46,149 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 02:59:46,149 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 02:59:46,149 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 02:59:46,150 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 02:59:46,150 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 02:59:46,150 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 02:59:46,150 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 02:59:46,150 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 [2019-10-15 02:59:46,422 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 02:59:46,444 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 02:59:46,447 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 02:59:46,448 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 02:59:46,448 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 02:59:46,449 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-10-15 02:59:46,520 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a45ecc774/d02c449209f84a57bf5903ea0f224799/FLAGec42438da [2019-10-15 02:59:47,109 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 02:59:47,110 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-simple/dll2n_remove_all_reverse.i [2019-10-15 02:59:47,125 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a45ecc774/d02c449209f84a57bf5903ea0f224799/FLAGec42438da [2019-10-15 02:59:47,397 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a45ecc774/d02c449209f84a57bf5903ea0f224799 [2019-10-15 02:59:47,406 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 02:59:47,408 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 02:59:47,412 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 02:59:47,412 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 02:59:47,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 02:59:47,416 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 02:59:47" (1/1) ... [2019-10-15 02:59:47,419 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fac7d7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:47, skipping insertion in model container [2019-10-15 02:59:47,419 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 02:59:47" (1/1) ... [2019-10-15 02:59:47,427 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 02:59:47,484 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 02:59:47,931 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 02:59:47,941 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 02:59:47,984 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 02:59:48,038 INFO L192 MainTranslator]: Completed translation [2019-10-15 02:59:48,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48 WrapperNode [2019-10-15 02:59:48,039 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 02:59:48,040 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 02:59:48,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 02:59:48,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 02:59:48,053 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,069 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,070 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,090 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,099 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,103 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (1/1) ... [2019-10-15 02:59:48,112 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 02:59:48,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 02:59:48,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 02:59:48,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 02:59:48,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (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 [2019-10-15 02:59:48,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 02:59:48,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 02:59:48,176 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-10-15 02:59:48,176 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-10-15 02:59:48,176 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2019-10-15 02:59:48,176 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2019-10-15 02:59:48,177 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2019-10-15 02:59:48,177 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2019-10-15 02:59:48,177 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 02:59:48,177 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 02:59:48,177 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-10-15 02:59:48,178 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-10-15 02:59:48,178 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-10-15 02:59:48,178 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-10-15 02:59:48,178 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-10-15 02:59:48,179 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-10-15 02:59:48,180 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-10-15 02:59:48,181 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-10-15 02:59:48,182 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-10-15 02:59:48,183 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-10-15 02:59:48,184 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-10-15 02:59:48,185 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 02:59:48,186 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-10-15 02:59:48,187 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 02:59:48,188 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-10-15 02:59:48,189 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-10-15 02:59:48,190 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-10-15 02:59:48,191 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-10-15 02:59:48,192 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-10-15 02:59:48,193 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2019-10-15 02:59:48,194 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-10-15 02:59:48,195 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 02:59:48,196 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 02:59:48,541 INFO L685 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2019-10-15 02:59:48,879 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 02:59:48,880 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-15 02:59:48,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 02:59:48 BoogieIcfgContainer [2019-10-15 02:59:48,881 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 02:59:48,882 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 02:59:48,882 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 02:59:48,885 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 02:59:48,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 02:59:47" (1/3) ... [2019-10-15 02:59:48,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78edd18c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 02:59:48, skipping insertion in model container [2019-10-15 02:59:48,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:59:48" (2/3) ... [2019-10-15 02:59:48,887 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78edd18c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 02:59:48, skipping insertion in model container [2019-10-15 02:59:48,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 02:59:48" (3/3) ... [2019-10-15 02:59:48,889 INFO L109 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2019-10-15 02:59:48,898 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 02:59:48,906 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 02:59:48,917 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 02:59:48,940 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 02:59:48,941 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 02:59:48,941 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 02:59:48,941 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 02:59:48,941 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 02:59:48,942 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 02:59:48,942 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 02:59:48,942 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 02:59:48,959 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-10-15 02:59:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 02:59:48,965 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:59:48,966 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:59:48,968 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:59:48,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:59:48,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1503477050, now seen corresponding path program 1 times [2019-10-15 02:59:48,983 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:59:48,984 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353874006] [2019-10-15 02:59:48,984 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:48,984 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:48,984 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:59:49,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:49,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:59:49,167 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353874006] [2019-10-15 02:59:49,168 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 02:59:49,169 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 02:59:49,169 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875707273] [2019-10-15 02:59:49,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 02:59:49,174 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:59:49,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 02:59:49,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-15 02:59:49,187 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 4 states. [2019-10-15 02:59:49,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:59:49,266 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2019-10-15 02:59:49,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 02:59:49,268 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-10-15 02:59:49,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:59:49,277 INFO L225 Difference]: With dead ends: 52 [2019-10-15 02:59:49,278 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 02:59:49,285 INFO L600 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 [2019-10-15 02:59:49,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 02:59:49,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-10-15 02:59:49,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 02:59:49,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-10-15 02:59:49,338 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 13 [2019-10-15 02:59:49,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:59:49,338 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-10-15 02:59:49,338 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 02:59:49,339 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-10-15 02:59:49,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 02:59:49,340 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:59:49,340 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:59:49,340 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:59:49,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:59:49,342 INFO L82 PathProgramCache]: Analyzing trace with hash -886044635, now seen corresponding path program 1 times [2019-10-15 02:59:49,342 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:59:49,342 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171573679] [2019-10-15 02:59:49,342 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:49,343 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:49,343 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:59:49,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:49,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:59:49,521 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171573679] [2019-10-15 02:59:49,521 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103667833] [2019-10-15 02:59:49,521 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 [2019-10-15 02:59:49,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:49,641 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 02:59:49,647 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:59:49,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 02:59:49,672 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:59:49,757 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 02:59:49,757 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 02:59:49,758 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [8] total 10 [2019-10-15 02:59:49,758 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185085145] [2019-10-15 02:59:49,759 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 02:59:49,760 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:59:49,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 02:59:49,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-10-15 02:59:49,760 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 7 states. [2019-10-15 02:59:49,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:59:49,817 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2019-10-15 02:59:49,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 02:59:49,819 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-10-15 02:59:49,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:59:49,820 INFO L225 Difference]: With dead ends: 45 [2019-10-15 02:59:49,820 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 02:59:49,821 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2019-10-15 02:59:49,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 02:59:49,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-10-15 02:59:49,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 02:59:49,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-10-15 02:59:49,827 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 20 [2019-10-15 02:59:49,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:59:49,827 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-10-15 02:59:49,827 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 02:59:49,827 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-10-15 02:59:49,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 02:59:49,828 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:59:49,828 INFO L380 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] [2019-10-15 02:59:50,036 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:59:50,039 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:59:50,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:59:50,040 INFO L82 PathProgramCache]: Analyzing trace with hash -497001908, now seen corresponding path program 1 times [2019-10-15 02:59:50,040 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:59:50,040 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636342773] [2019-10-15 02:59:50,040 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:50,040 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:50,040 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:59:50,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:50,152 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 02:59:50,152 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636342773] [2019-10-15 02:59:50,153 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 02:59:50,153 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 02:59:50,153 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859241721] [2019-10-15 02:59:50,154 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 02:59:50,154 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:59:50,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 02:59:50,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-15 02:59:50,158 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-10-15 02:59:50,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:59:50,288 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2019-10-15 02:59:50,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 02:59:50,289 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-15 02:59:50,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:59:50,290 INFO L225 Difference]: With dead ends: 40 [2019-10-15 02:59:50,290 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 02:59:50,291 INFO L600 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 [2019-10-15 02:59:50,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 02:59:50,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-10-15 02:59:50,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-15 02:59:50,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-10-15 02:59:50,296 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2019-10-15 02:59:50,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:59:50,296 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-10-15 02:59:50,296 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 02:59:50,297 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-10-15 02:59:50,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 02:59:50,299 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:59:50,299 INFO L380 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] [2019-10-15 02:59:50,299 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:59:50,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:59:50,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1275364761, now seen corresponding path program 1 times [2019-10-15 02:59:50,300 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:59:50,300 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441818368] [2019-10-15 02:59:50,300 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:50,300 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:59:50,300 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:59:50,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:50,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:59:50,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441818368] [2019-10-15 02:59:50,424 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226727591] [2019-10-15 02:59:50,424 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 [2019-10-15 02:59:50,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:59:50,589 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 02:59:50,591 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:59:50,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 02:59:50,598 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:59:50,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 02:59:50,686 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702438615] [2019-10-15 02:59:50,714 INFO L162 IcfgInterpreter]: Started Sifa with 25 locations of interest [2019-10-15 02:59:50,714 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 02:59:50,721 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 02:59:50,731 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 02:59:50,732 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 02:59:50,858 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 02:59:51,063 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:51,424 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:51,777 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:52,573 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:52,583 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:52,746 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:52,758 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:53,344 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:53,348 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 02:59:53,818 INFO L199 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2019-10-15 02:59:58,671 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 02:59:58,675 INFO L199 IcfgInterpreter]: Interpreting procedure dll_remove_last with input of size 35 for LOIs [2019-10-15 02:59:58,798 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 02:59:59,649 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2019-10-15 03:00:00,031 WARN L191 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 58 [2019-10-15 03:00:00,456 WARN L191 SmtUtils]: Spent 363.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 70 [2019-10-15 03:00:00,472 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 03:00:00,472 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [9, 6, 6] total 25 [2019-10-15 03:00:00,473 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718732445] [2019-10-15 03:00:00,474 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-15 03:00:00,474 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:00:00,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-15 03:00:00,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2019-10-15 03:00:00,475 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 16 states. [2019-10-15 03:00:01,220 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 63 [2019-10-15 03:00:01,543 WARN L191 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 69 [2019-10-15 03:00:01,943 WARN L191 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 79 [2019-10-15 03:00:02,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:00:02,080 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2019-10-15 03:00:02,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-15 03:00:02,080 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2019-10-15 03:00:02,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:00:02,083 INFO L225 Difference]: With dead ends: 48 [2019-10-15 03:00:02,083 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 03:00:02,084 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 56 SyntacticMatches, 8 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=146, Invalid=1044, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 03:00:02,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 03:00:02,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-10-15 03:00:02,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 03:00:02,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-15 03:00:02,097 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 26 [2019-10-15 03:00:02,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:00:02,098 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-15 03:00:02,098 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-15 03:00:02,098 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-15 03:00:02,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 03:00:02,100 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:00:02,100 INFO L380 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] [2019-10-15 03:00:02,310 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:00:02,310 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:00:02,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:00:02,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1313247650, now seen corresponding path program 1 times [2019-10-15 03:00:02,311 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:00:02,311 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591027076] [2019-10-15 03:00:02,312 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:02,312 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:02,312 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:00:02,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:00:02,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:00:02,453 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591027076] [2019-10-15 03:00:02,453 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640515530] [2019-10-15 03:00:02,453 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 [2019-10-15 03:00:02,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:00:02,576 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-15 03:00:02,578 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:00:02,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:00:02,584 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:00:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:00:02,657 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1229483569] [2019-10-15 03:00:02,659 INFO L162 IcfgInterpreter]: Started Sifa with 25 locations of interest [2019-10-15 03:00:02,659 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:00:02,660 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:00:02,660 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:00:02,660 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:00:02,688 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 03:00:02,813 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,013 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,241 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,559 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,570 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,612 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:03,623 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:00:05,713 INFO L199 IcfgInterpreter]: Interpreting procedure dll_create with input of size 44 for LOIs [2019-10-15 03:00:10,671 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:00:10,674 INFO L199 IcfgInterpreter]: Interpreting procedure dll_remove_last with input of size 13 for LOIs [2019-10-15 03:00:10,726 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:00:11,446 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:00:11,446 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 6, 17] total 27 [2019-10-15 03:00:11,446 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662633678] [2019-10-15 03:00:11,447 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 03:00:11,450 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:00:11,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 03:00:11,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=625, Unknown=1, NotChecked=0, Total=702 [2019-10-15 03:00:11,450 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 27 states. [2019-10-15 03:00:12,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:00:12,786 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2019-10-15 03:00:12,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 03:00:12,786 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 28 [2019-10-15 03:00:12,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:00:12,787 INFO L225 Difference]: With dead ends: 61 [2019-10-15 03:00:12,788 INFO L226 Difference]: Without dead ends: 40 [2019-10-15 03:00:12,789 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=227, Invalid=1934, Unknown=1, NotChecked=0, Total=2162 [2019-10-15 03:00:12,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-15 03:00:12,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2019-10-15 03:00:12,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-15 03:00:12,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-15 03:00:12,807 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 28 [2019-10-15 03:00:12,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:00:12,807 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-15 03:00:12,807 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-15 03:00:12,807 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-15 03:00:12,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-15 03:00:12,809 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:00:12,809 INFO L380 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] [2019-10-15 03:00:13,023 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:00:13,023 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:00:13,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:00:13,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1145109181, now seen corresponding path program 2 times [2019-10-15 03:00:13,024 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:00:13,024 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530734308] [2019-10-15 03:00:13,024 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:13,024 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:13,024 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:00:13,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:00:13,706 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:00:13,706 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530734308] [2019-10-15 03:00:13,706 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546390638] [2019-10-15 03:00:13,707 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 [2019-10-15 03:00:13,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 03:00:13,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:00:13,866 INFO L256 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 37 conjunts are in the unsatisfiable core [2019-10-15 03:00:13,869 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:00:14,132 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:00:14,132 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:00:14,282 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:00:14,282 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 03:00:14,282 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [17] total 24 [2019-10-15 03:00:14,282 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413642433] [2019-10-15 03:00:14,283 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-15 03:00:14,283 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:00:14,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-15 03:00:14,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=501, Unknown=0, NotChecked=0, Total=552 [2019-10-15 03:00:14,284 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2019-10-15 03:00:14,659 WARN L191 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 79 [2019-10-15 03:00:14,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:00:14,709 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2019-10-15 03:00:14,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:00:14,710 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 41 [2019-10-15 03:00:14,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:00:14,711 INFO L225 Difference]: With dead ends: 52 [2019-10-15 03:00:14,711 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 03:00:14,712 INFO L600 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 [2019-10-15 03:00:14,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 03:00:14,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2019-10-15 03:00:14,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-10-15 03:00:14,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2019-10-15 03:00:14,720 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 41 [2019-10-15 03:00:14,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:00:14,721 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2019-10-15 03:00:14,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-15 03:00:14,721 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2019-10-15 03:00:14,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-15 03:00:14,722 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:00:14,722 INFO L380 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] [2019-10-15 03:00:14,927 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:00:14,928 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:00:14,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:00:14,928 INFO L82 PathProgramCache]: Analyzing trace with hash -483568520, now seen corresponding path program 3 times [2019-10-15 03:00:14,929 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:00:14,929 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299160515] [2019-10-15 03:00:14,929 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:14,929 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:00:14,930 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:00:14,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:00:15,743 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:00:15,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299160515] [2019-10-15 03:00:15,744 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227780522] [2019-10-15 03:00:15,744 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 [2019-10-15 03:00:15,913 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 03:00:15,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:00:15,915 INFO L256 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 67 conjunts are in the unsatisfiable core [2019-10-15 03:00:15,921 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:00:23,485 WARN L191 SmtUtils]: Spent 4.54 s on a formula simplification that was a NOOP. DAG size: 34