/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/heap-manipulation/dll_of_dll-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:20:42,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:20:42,289 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:20:42,319 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:20:42,320 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:20:42,321 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:20:42,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:20:42,324 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:20:42,325 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:20:42,326 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:20:42,327 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:20:42,328 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:20:42,329 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:20:42,330 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:20:42,331 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:20:42,332 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:20:42,333 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:20:42,334 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:20:42,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:20:42,337 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:20:42,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:20:42,343 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:20:42,344 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:20:42,348 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:20:42,352 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 10:20:42,352 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 10:20:42,352 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 10:20:42,355 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 10:20:42,356 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 10:20:42,357 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 10:20:42,357 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:20:42,358 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:20:42,358 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:20:42,361 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:20:42,363 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:20:42,364 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:20:42,364 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:20:42,365 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:20:42,365 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:20:42,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:20:42,367 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:20:42,368 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:20:42,420 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:20:42,421 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:20:42,422 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:20:42,422 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:20:42,422 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:20:42,422 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:20:42,423 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:20:42,424 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:20:42,424 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:20:42,424 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:20:42,424 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:20:42,425 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:20:42,425 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:20:42,425 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:20:42,425 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:20:42,425 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:20:42,426 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:20:42,427 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:20:42,427 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:20:42,427 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:20:42,427 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:20:42,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:20:42,428 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:20:42,428 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:20:42,428 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:20:42,428 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:20:42,429 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:20:42,429 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:20:42,429 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:20:42,429 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:20:42,916 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:20:42,943 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:20:42,948 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:20:42,949 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:20:42,950 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:20:42,951 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/heap-manipulation/dll_of_dll-2.i [2020-09-21 10:20:43,038 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d753b2cd/6fdb88389bee498c9db9972429df5398/FLAG38909eb32 [2020-09-21 10:20:43,619 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:20:43,620 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/heap-manipulation/dll_of_dll-2.i [2020-09-21 10:20:43,636 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d753b2cd/6fdb88389bee498c9db9972429df5398/FLAG38909eb32 [2020-09-21 10:20:43,888 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0d753b2cd/6fdb88389bee498c9db9972429df5398 [2020-09-21 10:20:43,902 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:20:43,908 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:20:43,909 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:20:43,909 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:20:43,914 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:20:43,915 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:20:43" (1/1) ... [2020-09-21 10:20:43,920 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58b1442d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:43, skipping insertion in model container [2020-09-21 10:20:43,920 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:20:43" (1/1) ... [2020-09-21 10:20:43,930 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:20:44,007 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:20:44,600 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:20:44,612 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:20:44,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:20:44,776 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:20:44,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44 WrapperNode [2020-09-21 10:20:44,777 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:20:44,778 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:20:44,778 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:20:44,778 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:20:44,793 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,794 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,815 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,845 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,860 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,865 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... [2020-09-21 10:20:44,874 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:20:44,875 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:20:44,875 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:20:44,875 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:20:44,876 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:20:44,948 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:20:44,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:20:44,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2020-09-21 10:20:44,949 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-09-21 10:20:44,949 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-09-21 10:20:44,950 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2020-09-21 10:20:44,950 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_or_die_slave [2020-09-21 10:20:44,951 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_or_die_master [2020-09-21 10:20:44,951 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_insert_slave [2020-09-21 10:20:44,951 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create_generic [2020-09-21 10:20:44,951 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create_slave [2020-09-21 10:20:44,952 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy_slave [2020-09-21 10:20:44,953 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy_nested_lists [2020-09-21 10:20:44,953 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_reinit_nested_lists [2020-09-21 10:20:44,953 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_destroy_master [2020-09-21 10:20:44,954 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_insert_master [2020-09-21 10:20:44,954 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create_master [2020-09-21 10:20:44,954 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_base [2020-09-21 10:20:44,954 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_full [2020-09-21 10:20:44,955 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_dangling [2020-09-21 10:20:44,955 INFO L138 BoogieDeclarations]: Found implementation of procedure inspect_init [2020-09-21 10:20:44,955 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:20:44,956 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:20:44,956 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-09-21 10:20:44,958 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-09-21 10:20:44,958 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-09-21 10:20:44,958 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-09-21 10:20:44,959 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-09-21 10:20:44,959 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-09-21 10:20:44,959 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-09-21 10:20:44,959 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-09-21 10:20:44,960 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-09-21 10:20:44,960 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-09-21 10:20:44,961 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-09-21 10:20:44,962 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-09-21 10:20:44,963 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-09-21 10:20:44,964 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-09-21 10:20:44,965 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-09-21 10:20:44,965 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-09-21 10:20:44,965 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-09-21 10:20:44,965 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-09-21 10:20:44,966 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-09-21 10:20:44,966 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-09-21 10:20:44,966 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-09-21 10:20:44,966 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-09-21 10:20:44,967 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-09-21 10:20:44,967 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-09-21 10:20:44,967 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-09-21 10:20:44,967 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-09-21 10:20:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-09-21 10:20:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-09-21 10:20:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-09-21 10:20:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-09-21 10:20:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-21 10:20:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-09-21 10:20:44,970 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-09-21 10:20:44,970 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-09-21 10:20:44,970 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-09-21 10:20:44,971 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-09-21 10:20:44,971 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-09-21 10:20:44,971 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-09-21 10:20:44,971 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-09-21 10:20:44,971 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:20:44,972 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-09-21 10:20:44,972 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-09-21 10:20:44,973 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-09-21 10:20:44,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-09-21 10:20:44,975 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-09-21 10:20:44,976 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-09-21 10:20:44,977 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-09-21 10:20:44,977 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-09-21 10:20:44,977 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-09-21 10:20:44,978 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-09-21 10:20:44,978 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-09-21 10:20:44,978 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-09-21 10:20:44,978 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-09-21 10:20:44,979 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-09-21 10:20:44,980 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-09-21 10:20:44,980 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 10:20:44,980 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2020-09-21 10:20:44,981 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_or_die_slave [2020-09-21 10:20:44,981 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-21 10:20:44,982 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-21 10:20:44,982 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_or_die_master [2020-09-21 10:20:44,986 INFO L130 BoogieDeclarations]: Found specification of procedure dll_insert_slave [2020-09-21 10:20:44,986 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-21 10:20:44,986 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create_generic [2020-09-21 10:20:44,986 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:20:44,987 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2020-09-21 10:20:44,987 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2020-09-21 10:20:44,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:20:44,987 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create_slave [2020-09-21 10:20:44,988 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy_slave [2020-09-21 10:20:44,994 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy_nested_lists [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure dll_reinit_nested_lists [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure dll_destroy_master [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure dll_insert_master [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create_master [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_base [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_full [2020-09-21 10:20:44,995 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_dangling [2020-09-21 10:20:44,996 INFO L130 BoogieDeclarations]: Found specification of procedure inspect_init [2020-09-21 10:20:44,996 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:20:44,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:20:44,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:20:45,830 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:20:45,830 INFO L295 CfgBuilder]: Removed 38 assume(true) statements. [2020-09-21 10:20:45,836 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:20:45 BoogieIcfgContainer [2020-09-21 10:20:45,836 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:20:45,837 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:20:45,837 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:20:45,841 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:20:45,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:20:43" (1/3) ... [2020-09-21 10:20:45,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21223e3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:20:45, skipping insertion in model container [2020-09-21 10:20:45,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:20:44" (2/3) ... [2020-09-21 10:20:45,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21223e3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:20:45, skipping insertion in model container [2020-09-21 10:20:45,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:20:45" (3/3) ... [2020-09-21 10:20:45,845 INFO L109 eAbstractionObserver]: Analyzing ICFG dll_of_dll-2.i [2020-09-21 10:20:45,856 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:20:45,866 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:20:45,888 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:20:45,920 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:20:45,920 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:20:45,921 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:20:45,921 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:20:45,921 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:20:45,921 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:20:45,921 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:20:45,921 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:20:45,949 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states. [2020-09-21 10:20:45,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-09-21 10:20:45,960 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:45,961 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:45,961 INFO L427 AbstractCegarLoop]: === Iteration 1 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:45,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:45,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1405399524, now seen corresponding path program 1 times [2020-09-21 10:20:45,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:45,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594662926] [2020-09-21 10:20:45,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:46,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:46,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:20:46,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:46,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:46,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:46,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:46,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:46,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:46,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:46,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:46,592 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-09-21 10:20:46,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594662926] [2020-09-21 10:20:46,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:20:46,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:20:46,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482621295] [2020-09-21 10:20:46,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:20:46,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:46,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:20:46,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:20:46,626 INFO L87 Difference]: Start difference. First operand 169 states. Second operand 4 states. [2020-09-21 10:20:47,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:47,125 INFO L93 Difference]: Finished difference Result 343 states and 542 transitions. [2020-09-21 10:20:47,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:20:47,127 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 59 [2020-09-21 10:20:47,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:47,144 INFO L225 Difference]: With dead ends: 343 [2020-09-21 10:20:47,144 INFO L226 Difference]: Without dead ends: 166 [2020-09-21 10:20:47,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:20:47,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2020-09-21 10:20:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2020-09-21 10:20:47,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-09-21 10:20:47,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 184 transitions. [2020-09-21 10:20:47,244 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 184 transitions. Word has length 59 [2020-09-21 10:20:47,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:47,245 INFO L479 AbstractCegarLoop]: Abstraction has 155 states and 184 transitions. [2020-09-21 10:20:47,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:20:47,245 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 184 transitions. [2020-09-21 10:20:47,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-21 10:20:47,248 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:47,248 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:47,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:20:47,250 INFO L427 AbstractCegarLoop]: === Iteration 2 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:47,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:47,251 INFO L82 PathProgramCache]: Analyzing trace with hash 747676979, now seen corresponding path program 1 times [2020-09-21 10:20:47,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:47,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733449628] [2020-09-21 10:20:47,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:47,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:47,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:20:47,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:47,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:47,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:47,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:47,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:47,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:47,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:47,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:47,834 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-09-21 10:20:47,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733449628] [2020-09-21 10:20:47,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:47,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:20:47,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785809904] [2020-09-21 10:20:47,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:20:47,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:47,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:20:47,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:20:47,844 INFO L87 Difference]: Start difference. First operand 155 states and 184 transitions. Second operand 13 states. [2020-09-21 10:20:49,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:49,194 INFO L93 Difference]: Finished difference Result 327 states and 406 transitions. [2020-09-21 10:20:49,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:20:49,194 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 60 [2020-09-21 10:20:49,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:49,201 INFO L225 Difference]: With dead ends: 327 [2020-09-21 10:20:49,201 INFO L226 Difference]: Without dead ends: 179 [2020-09-21 10:20:49,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:20:49,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-09-21 10:20:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 168. [2020-09-21 10:20:49,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-09-21 10:20:49,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 199 transitions. [2020-09-21 10:20:49,242 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 199 transitions. Word has length 60 [2020-09-21 10:20:49,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:49,243 INFO L479 AbstractCegarLoop]: Abstraction has 168 states and 199 transitions. [2020-09-21 10:20:49,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:20:49,243 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 199 transitions. [2020-09-21 10:20:49,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-09-21 10:20:49,246 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:49,246 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:49,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:20:49,247 INFO L427 AbstractCegarLoop]: === Iteration 3 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:49,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:49,247 INFO L82 PathProgramCache]: Analyzing trace with hash 586330229, now seen corresponding path program 1 times [2020-09-21 10:20:49,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:49,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437938898] [2020-09-21 10:20:49,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:49,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:49,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:20:49,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:49,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:49,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:49,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:49,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:50,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:20:50,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:50,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:50,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:50,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:50,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:50,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:50,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:50,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:50,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-09-21 10:20:51,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:51,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:51,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:20:51,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:51,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:51,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:51,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:51,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:51,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:51,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:51,336 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 15 proven. 95 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-09-21 10:20:51,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437938898] [2020-09-21 10:20:51,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:51,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:20:51,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665365795] [2020-09-21 10:20:51,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:20:51,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:51,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:20:51,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=746, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:20:51,342 INFO L87 Difference]: Start difference. First operand 168 states and 199 transitions. Second operand 29 states. [2020-09-21 10:20:55,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:55,350 INFO L93 Difference]: Finished difference Result 358 states and 439 transitions. [2020-09-21 10:20:55,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:20:55,350 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 154 [2020-09-21 10:20:55,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:55,354 INFO L225 Difference]: With dead ends: 358 [2020-09-21 10:20:55,354 INFO L226 Difference]: Without dead ends: 196 [2020-09-21 10:20:55,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=237, Invalid=2415, Unknown=0, NotChecked=0, Total=2652 [2020-09-21 10:20:55,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2020-09-21 10:20:55,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 185. [2020-09-21 10:20:55,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-09-21 10:20:55,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 217 transitions. [2020-09-21 10:20:55,380 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 217 transitions. Word has length 154 [2020-09-21 10:20:55,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:55,380 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 217 transitions. [2020-09-21 10:20:55,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:20:55,381 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 217 transitions. [2020-09-21 10:20:55,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-09-21 10:20:55,383 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:55,383 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:55,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:20:55,384 INFO L427 AbstractCegarLoop]: === Iteration 4 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:55,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:55,384 INFO L82 PathProgramCache]: Analyzing trace with hash -467161035, now seen corresponding path program 1 times [2020-09-21 10:20:55,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:55,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518032502] [2020-09-21 10:20:55,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:55,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:55,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:55,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:55,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:20:55,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:55,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:55,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:55,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:55,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:55,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:20:56,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:56,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:56,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-09-21 10:20:56,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:20:56,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:56,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:20:56,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:20:56,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:20:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:56,859 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-09-21 10:20:56,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518032502] [2020-09-21 10:20:56,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:20:56,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:20:56,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831319067] [2020-09-21 10:20:56,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:20:56,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:20:56,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:20:56,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:20:56,863 INFO L87 Difference]: Start difference. First operand 185 states and 217 transitions. Second operand 19 states. [2020-09-21 10:20:59,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:20:59,212 INFO L93 Difference]: Finished difference Result 375 states and 445 transitions. [2020-09-21 10:20:59,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:20:59,213 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 154 [2020-09-21 10:20:59,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:20:59,216 INFO L225 Difference]: With dead ends: 375 [2020-09-21 10:20:59,217 INFO L226 Difference]: Without dead ends: 202 [2020-09-21 10:20:59,218 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:20:59,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-09-21 10:20:59,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 189. [2020-09-21 10:20:59,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-09-21 10:20:59,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 222 transitions. [2020-09-21 10:20:59,251 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 222 transitions. Word has length 154 [2020-09-21 10:20:59,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:20:59,252 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 222 transitions. [2020-09-21 10:20:59,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:20:59,252 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 222 transitions. [2020-09-21 10:20:59,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-09-21 10:20:59,259 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:20:59,260 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:20:59,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:20:59,260 INFO L427 AbstractCegarLoop]: === Iteration 5 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:20:59,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:20:59,261 INFO L82 PathProgramCache]: Analyzing trace with hash -2084601485, now seen corresponding path program 1 times [2020-09-21 10:20:59,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:20:59,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884340481] [2020-09-21 10:20:59,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:20:59,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:59,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:20:59,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:59,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:20:59,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:20:59,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:21:00,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:00,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:21:00,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-09-21 10:21:00,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:21:00,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:00,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:21:00,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:00,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:00,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:00,882 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2020-09-21 10:21:00,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884340481] [2020-09-21 10:21:00,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:21:00,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:21:00,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121424038] [2020-09-21 10:21:00,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:21:00,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:21:00,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:21:00,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:21:00,884 INFO L87 Difference]: Start difference. First operand 189 states and 222 transitions. Second operand 22 states. [2020-09-21 10:21:03,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:21:03,366 INFO L93 Difference]: Finished difference Result 327 states and 393 transitions. [2020-09-21 10:21:03,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:21:03,367 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 154 [2020-09-21 10:21:03,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:21:03,370 INFO L225 Difference]: With dead ends: 327 [2020-09-21 10:21:03,370 INFO L226 Difference]: Without dead ends: 258 [2020-09-21 10:21:03,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=1129, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:21:03,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-09-21 10:21:03,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 213. [2020-09-21 10:21:03,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-09-21 10:21:03,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 251 transitions. [2020-09-21 10:21:03,410 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 251 transitions. Word has length 154 [2020-09-21 10:21:03,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:21:03,412 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 251 transitions. [2020-09-21 10:21:03,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:21:03,413 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 251 transitions. [2020-09-21 10:21:03,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2020-09-21 10:21:03,424 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:21:03,424 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:21:03,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:21:03,425 INFO L427 AbstractCegarLoop]: === Iteration 6 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:21:03,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:21:03,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1709746076, now seen corresponding path program 1 times [2020-09-21 10:21:03,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:21:03,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458161592] [2020-09-21 10:21:03,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:21:03,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:03,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:03,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:03,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-21 10:21:03,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:04,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:04,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:04,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:21:04,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:04,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:04,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:04,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:04,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-09-21 10:21:04,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:04,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:04,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:04,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2020-09-21 10:21:04,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:05,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-21 10:21:05,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:05,630 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 44 [2020-09-21 10:21:05,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-09-21 10:21:06,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:06,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-21 10:21:06,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:07,202 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-09-21 10:21:07,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:21:07,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:21:34,757 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 257 DAG size of output: 48