/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/list-ext2-properties/list_and_tree_cnstr-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 15:30:11,805 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 15:30:11,808 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 15:30:11,832 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 15:30:11,832 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 15:30:11,834 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 15:30:11,835 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 15:30:11,837 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 15:30:11,838 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 15:30:11,839 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 15:30:11,840 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 15:30:11,841 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 15:30:11,842 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 15:30:11,843 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 15:30:11,844 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 15:30:11,845 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 15:30:11,846 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 15:30:11,846 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 15:30:11,848 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 15:30:11,851 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 15:30:11,853 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 15:30:11,856 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 15:30:11,859 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 15:30:11,861 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 15:30:11,866 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 15:30:11,867 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 15:30:11,867 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 15:30:11,869 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 15:30:11,870 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 15:30:11,871 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 15:30:11,871 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 15:30:11,872 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 15:30:11,873 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 15:30:11,874 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 15:30:11,875 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 15:30:11,879 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 15:30:11,880 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 15:30:11,880 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 15:30:11,880 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 15:30:11,881 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 15:30:11,883 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 15:30:11,884 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 [2020-08-18 15:30:11,934 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 15:30:11,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 15:30:11,935 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 15:30:11,935 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 15:30:11,940 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 15:30:11,940 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 15:30:11,940 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 15:30:11,941 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 15:30:11,941 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 15:30:11,941 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 15:30:11,941 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 15:30:11,941 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 15:30:11,942 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 15:30:11,942 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 15:30:11,942 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 15:30:11,942 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 15:30:11,942 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 15:30:11,942 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 15:30:11,945 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 15:30:11,945 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 15:30:11,945 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 15:30:11,945 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 15:30:11,946 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 15:30:11,946 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 15:30:11,946 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 15:30:11,946 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 15:30:11,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 15:30:11,947 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 15:30:11,947 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 15:30:11,947 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 [2020-08-18 15:30:12,286 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 15:30:12,301 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 15:30:12,307 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 15:30:12,308 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 15:30:12,309 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 15:30:12,310 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 15:30:12,376 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd2f5ae9d/7f0a5b00999a4d6f997dd8f259c0fe12/FLAG62e4c0b3e [2020-08-18 15:30:12,906 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 15:30:12,907 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-18 15:30:12,922 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd2f5ae9d/7f0a5b00999a4d6f997dd8f259c0fe12/FLAG62e4c0b3e [2020-08-18 15:30:13,247 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bd2f5ae9d/7f0a5b00999a4d6f997dd8f259c0fe12 [2020-08-18 15:30:13,257 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 15:30:13,259 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 15:30:13,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 15:30:13,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 15:30:13,265 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 15:30:13,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:13,268 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38917b5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13, skipping insertion in model container [2020-08-18 15:30:13,269 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:13,277 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 15:30:13,320 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 15:30:13,804 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:30:13,821 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 15:30:13,903 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:30:13,953 INFO L208 MainTranslator]: Completed translation [2020-08-18 15:30:13,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13 WrapperNode [2020-08-18 15:30:13,954 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 15:30:13,955 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 15:30:13,955 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 15:30:13,956 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 15:30:13,970 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:13,971 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:13,989 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:13,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:14,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:14,022 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:14,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (1/1) ... [2020-08-18 15:30:14,034 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 15:30:14,035 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 15:30:14,035 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 15:30:14,035 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 15:30:14,036 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (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 [2020-08-18 15:30:14,100 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 15:30:14,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 15:30:14,101 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-18 15:30:14,101 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-18 15:30:14,101 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-18 15:30:14,101 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 15:30:14,102 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 15:30:14,102 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 15:30:14,102 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-18 15:30:14,102 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-18 15:30:14,103 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-18 15:30:14,104 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-18 15:30:14,105 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-18 15:30:14,106 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-18 15:30:14,107 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-18 15:30:14,108 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-18 15:30:14,109 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-18 15:30:14,110 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-18 15:30:14,111 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-18 15:30:14,112 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-18 15:30:14,113 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-18 15:30:14,114 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-18 15:30:14,115 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-18 15:30:14,116 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 15:30:14,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 15:30:14,118 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 15:30:14,119 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 15:30:14,437 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-18 15:30:14,776 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 15:30:14,777 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-08-18 15:30:14,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:30:14 BoogieIcfgContainer [2020-08-18 15:30:14,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 15:30:14,784 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 15:30:14,784 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 15:30:14,787 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 15:30:14,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 03:30:13" (1/3) ... [2020-08-18 15:30:14,789 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d77cd4c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:30:14, skipping insertion in model container [2020-08-18 15:30:14,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:30:13" (2/3) ... [2020-08-18 15:30:14,790 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d77cd4c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:30:14, skipping insertion in model container [2020-08-18 15:30:14,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:30:14" (3/3) ... [2020-08-18 15:30:14,792 INFO L109 eAbstractionObserver]: Analyzing ICFG list_and_tree_cnstr-1.i [2020-08-18 15:30:14,804 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 15:30:14,812 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 15:30:14,828 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 15:30:14,856 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 15:30:14,857 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 15:30:14,857 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 15:30:14,858 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 15:30:14,858 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 15:30:14,859 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 15:30:14,859 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 15:30:14,859 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 15:30:14,880 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states. [2020-08-18 15:30:14,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 15:30:14,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:14,890 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:14,890 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:14,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:14,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1575706012, now seen corresponding path program 1 times [2020-08-18 15:30:14,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:14,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607940633] [2020-08-18 15:30:14,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:15,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:15,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:30:15,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607940633] [2020-08-18 15:30:15,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:15,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 15:30:15,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522335548] [2020-08-18 15:30:15,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 15:30:15,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:15,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 15:30:15,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:30:15,202 INFO L87 Difference]: Start difference. First operand 57 states. Second operand 3 states. [2020-08-18 15:30:15,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:15,386 INFO L93 Difference]: Finished difference Result 108 states and 166 transitions. [2020-08-18 15:30:15,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 15:30:15,388 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-18 15:30:15,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:15,396 INFO L225 Difference]: With dead ends: 108 [2020-08-18 15:30:15,397 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 15:30:15,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 15:30:15,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 15:30:15,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 15:30:15,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 15:30:15,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2020-08-18 15:30:15,440 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 20 [2020-08-18 15:30:15,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:15,441 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2020-08-18 15:30:15,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 15:30:15,441 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2020-08-18 15:30:15,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 15:30:15,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:15,443 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:15,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 15:30:15,443 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:15,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:15,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1627887593, now seen corresponding path program 1 times [2020-08-18 15:30:15,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:15,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009502535] [2020-08-18 15:30:15,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:15,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:15,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:30:15,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009502535] [2020-08-18 15:30:15,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:15,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 15:30:15,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657790460] [2020-08-18 15:30:15,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 15:30:15,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:15,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 15:30:15,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:30:15,542 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand 4 states. [2020-08-18 15:30:15,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:15,683 INFO L93 Difference]: Finished difference Result 75 states and 101 transitions. [2020-08-18 15:30:15,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 15:30:15,683 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-08-18 15:30:15,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:15,687 INFO L225 Difference]: With dead ends: 75 [2020-08-18 15:30:15,687 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 15:30:15,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:30:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 15:30:15,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 15:30:15,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 15:30:15,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 77 transitions. [2020-08-18 15:30:15,699 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 77 transitions. Word has length 25 [2020-08-18 15:30:15,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:15,700 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 77 transitions. [2020-08-18 15:30:15,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 15:30:15,700 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 77 transitions. [2020-08-18 15:30:15,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 15:30:15,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:15,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:15,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 15:30:15,702 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:15,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:15,703 INFO L82 PathProgramCache]: Analyzing trace with hash -164754602, now seen corresponding path program 1 times [2020-08-18 15:30:15,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:15,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577700689] [2020-08-18 15:30:15,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:15,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:15,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:15,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 15:30:15,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577700689] [2020-08-18 15:30:15,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:15,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 15:30:15,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870849040] [2020-08-18 15:30:15,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 15:30:15,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:15,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 15:30:15,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:30:15,825 INFO L87 Difference]: Start difference. First operand 55 states and 77 transitions. Second operand 4 states. [2020-08-18 15:30:15,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:15,974 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2020-08-18 15:30:15,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 15:30:15,975 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 31 [2020-08-18 15:30:15,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:15,976 INFO L225 Difference]: With dead ends: 93 [2020-08-18 15:30:15,977 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 15:30:15,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:30:15,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 15:30:15,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 15:30:15,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 15:30:15,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2020-08-18 15:30:15,986 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2020-08-18 15:30:15,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:15,986 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2020-08-18 15:30:15,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 15:30:15,986 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2020-08-18 15:30:15,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 15:30:15,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:15,988 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:15,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 15:30:15,988 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:15,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:15,989 INFO L82 PathProgramCache]: Analyzing trace with hash -982403052, now seen corresponding path program 1 times [2020-08-18 15:30:15,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:15,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [911988339] [2020-08-18 15:30:15,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:16,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:16,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:16,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [911988339] [2020-08-18 15:30:16,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:16,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 15:30:16,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192185674] [2020-08-18 15:30:16,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:30:16,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:16,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:30:16,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:30:16,075 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand 6 states. [2020-08-18 15:30:16,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:16,282 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2020-08-18 15:30:16,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:30:16,283 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-08-18 15:30:16,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:16,285 INFO L225 Difference]: With dead ends: 82 [2020-08-18 15:30:16,285 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 15:30:16,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:30:16,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 15:30:16,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2020-08-18 15:30:16,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 15:30:16,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 91 transitions. [2020-08-18 15:30:16,296 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 91 transitions. Word has length 31 [2020-08-18 15:30:16,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:16,296 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 91 transitions. [2020-08-18 15:30:16,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:30:16,297 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 91 transitions. [2020-08-18 15:30:16,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 15:30:16,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:16,298 INFO L422 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, 1, 1, 1, 1, 1] [2020-08-18 15:30:16,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 15:30:16,299 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:16,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:16,299 INFO L82 PathProgramCache]: Analyzing trace with hash 852152367, now seen corresponding path program 1 times [2020-08-18 15:30:16,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:16,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738964265] [2020-08-18 15:30:16,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:16,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:16,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,423 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:16,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738964265] [2020-08-18 15:30:16,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:16,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 15:30:16,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455821556] [2020-08-18 15:30:16,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:30:16,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:16,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:30:16,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:30:16,427 INFO L87 Difference]: Start difference. First operand 66 states and 91 transitions. Second operand 6 states. [2020-08-18 15:30:16,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:16,650 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 15:30:16,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:30:16,650 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 15:30:16,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:16,651 INFO L225 Difference]: With dead ends: 84 [2020-08-18 15:30:16,652 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 15:30:16,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:30:16,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 15:30:16,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2020-08-18 15:30:16,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 15:30:16,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 88 transitions. [2020-08-18 15:30:16,661 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 88 transitions. Word has length 33 [2020-08-18 15:30:16,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:16,661 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 88 transitions. [2020-08-18 15:30:16,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:30:16,661 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 88 transitions. [2020-08-18 15:30:16,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 15:30:16,662 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:16,663 INFO L422 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, 1, 1, 1, 1, 1] [2020-08-18 15:30:16,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 15:30:16,663 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:16,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:16,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1876855343, now seen corresponding path program 1 times [2020-08-18 15:30:16,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:16,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952465519] [2020-08-18 15:30:16,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:16,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:16,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:16,732 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:16,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952465519] [2020-08-18 15:30:16,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:30:16,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 15:30:16,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550979247] [2020-08-18 15:30:16,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 15:30:16,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:16,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 15:30:16,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 15:30:16,735 INFO L87 Difference]: Start difference. First operand 64 states and 88 transitions. Second operand 6 states. [2020-08-18 15:30:16,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:16,917 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-18 15:30:16,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 15:30:16,917 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-18 15:30:16,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:16,919 INFO L225 Difference]: With dead ends: 84 [2020-08-18 15:30:16,920 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 15:30:16,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:30:16,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 15:30:16,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 61. [2020-08-18 15:30:16,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 15:30:16,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 84 transitions. [2020-08-18 15:30:16,937 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 84 transitions. Word has length 33 [2020-08-18 15:30:16,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:16,938 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 84 transitions. [2020-08-18 15:30:16,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 15:30:16,938 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 84 transitions. [2020-08-18 15:30:16,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 15:30:16,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:16,939 INFO L422 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:16,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 15:30:16,942 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:16,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:16,942 INFO L82 PathProgramCache]: Analyzing trace with hash -778946181, now seen corresponding path program 1 times [2020-08-18 15:30:16,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:16,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62917162] [2020-08-18 15:30:16,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:16,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:17,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:17,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:17,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:17,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62917162] [2020-08-18 15:30:17,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:17,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 15:30:17,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875133980] [2020-08-18 15:30:17,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 15:30:17,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:17,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 15:30:17,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 15:30:17,099 INFO L87 Difference]: Start difference. First operand 61 states and 84 transitions. Second operand 9 states. [2020-08-18 15:30:17,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:17,443 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2020-08-18 15:30:17,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 15:30:17,443 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 15:30:17,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:17,445 INFO L225 Difference]: With dead ends: 86 [2020-08-18 15:30:17,445 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 15:30:17,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:30:17,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 15:30:17,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2020-08-18 15:30:17,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 15:30:17,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 92 transitions. [2020-08-18 15:30:17,463 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 92 transitions. Word has length 35 [2020-08-18 15:30:17,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:17,466 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 92 transitions. [2020-08-18 15:30:17,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 15:30:17,466 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 92 transitions. [2020-08-18 15:30:17,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 15:30:17,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:17,469 INFO L422 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, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:17,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 15:30:17,469 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:17,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:17,472 INFO L82 PathProgramCache]: Analyzing trace with hash 84455483, now seen corresponding path program 1 times [2020-08-18 15:30:17,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:17,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289762817] [2020-08-18 15:30:17,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:17,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:17,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:17,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:17,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:17,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289762817] [2020-08-18 15:30:17,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:17,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 15:30:17,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570322667] [2020-08-18 15:30:17,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 15:30:17,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:17,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 15:30:17,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 15:30:17,589 INFO L87 Difference]: Start difference. First operand 68 states and 92 transitions. Second operand 9 states. [2020-08-18 15:30:17,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:17,953 INFO L93 Difference]: Finished difference Result 95 states and 123 transitions. [2020-08-18 15:30:17,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 15:30:17,954 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-18 15:30:17,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:17,956 INFO L225 Difference]: With dead ends: 95 [2020-08-18 15:30:17,956 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 15:30:17,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:30:17,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 15:30:17,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2020-08-18 15:30:17,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 15:30:17,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2020-08-18 15:30:17,964 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 35 [2020-08-18 15:30:17,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:17,964 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2020-08-18 15:30:17,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 15:30:17,964 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2020-08-18 15:30:17,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 15:30:17,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:17,966 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:17,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 15:30:17,966 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:17,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:17,967 INFO L82 PathProgramCache]: Analyzing trace with hash -169587242, now seen corresponding path program 1 times [2020-08-18 15:30:17,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:17,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106447272] [2020-08-18 15:30:17,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:17,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:18,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:18,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:18,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:18,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106447272] [2020-08-18 15:30:18,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:18,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 15:30:18,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175770413] [2020-08-18 15:30:18,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 15:30:18,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:18,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 15:30:18,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:30:18,204 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand 10 states. [2020-08-18 15:30:18,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:18,646 INFO L93 Difference]: Finished difference Result 99 states and 128 transitions. [2020-08-18 15:30:18,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 15:30:18,647 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-18 15:30:18,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:18,648 INFO L225 Difference]: With dead ends: 99 [2020-08-18 15:30:18,648 INFO L226 Difference]: Without dead ends: 95 [2020-08-18 15:30:18,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:30:18,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-18 15:30:18,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 83. [2020-08-18 15:30:18,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 15:30:18,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 111 transitions. [2020-08-18 15:30:18,657 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 111 transitions. Word has length 37 [2020-08-18 15:30:18,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:18,658 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 111 transitions. [2020-08-18 15:30:18,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 15:30:18,658 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 111 transitions. [2020-08-18 15:30:18,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:30:18,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:18,659 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:18,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 15:30:18,660 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:18,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:18,660 INFO L82 PathProgramCache]: Analyzing trace with hash 284097905, now seen corresponding path program 1 times [2020-08-18 15:30:18,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:18,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1608638693] [2020-08-18 15:30:18,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:18,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:18,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:18,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:18,872 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:18,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1608638693] [2020-08-18 15:30:18,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:18,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 15:30:18,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541564949] [2020-08-18 15:30:18,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 15:30:18,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:18,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 15:30:18,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:30:18,874 INFO L87 Difference]: Start difference. First operand 83 states and 111 transitions. Second operand 10 states. [2020-08-18 15:30:19,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:19,274 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2020-08-18 15:30:19,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 15:30:19,275 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 15:30:19,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:19,277 INFO L225 Difference]: With dead ends: 101 [2020-08-18 15:30:19,277 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 15:30:19,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:30:19,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 15:30:19,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 74. [2020-08-18 15:30:19,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 15:30:19,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 99 transitions. [2020-08-18 15:30:19,284 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 99 transitions. Word has length 39 [2020-08-18 15:30:19,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:19,285 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 99 transitions. [2020-08-18 15:30:19,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 15:30:19,285 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 99 transitions. [2020-08-18 15:30:19,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:30:19,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:19,286 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:19,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 15:30:19,286 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:19,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:19,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1308800881, now seen corresponding path program 2 times [2020-08-18 15:30:19,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:19,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86413191] [2020-08-18 15:30:19,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:19,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:19,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:19,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:19,481 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:19,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86413191] [2020-08-18 15:30:19,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:19,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 15:30:19,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833802692] [2020-08-18 15:30:19,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 15:30:19,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:19,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 15:30:19,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:30:19,484 INFO L87 Difference]: Start difference. First operand 74 states and 99 transitions. Second operand 10 states. [2020-08-18 15:30:19,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:19,875 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 15:30:19,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 15:30:19,876 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-18 15:30:19,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:19,877 INFO L225 Difference]: With dead ends: 94 [2020-08-18 15:30:19,877 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 15:30:19,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2020-08-18 15:30:19,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 15:30:19,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2020-08-18 15:30:19,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 15:30:19,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 93 transitions. [2020-08-18 15:30:19,883 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 93 transitions. Word has length 39 [2020-08-18 15:30:19,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:19,884 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 93 transitions. [2020-08-18 15:30:19,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 15:30:19,884 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 93 transitions. [2020-08-18 15:30:19,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:30:19,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:19,885 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:19,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 15:30:19,885 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:19,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:19,885 INFO L82 PathProgramCache]: Analyzing trace with hash -315248798, now seen corresponding path program 2 times [2020-08-18 15:30:19,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:19,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806680856] [2020-08-18 15:30:19,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:19,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:20,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:20,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:20,073 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:20,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806680856] [2020-08-18 15:30:20,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:20,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:30:20,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963666164] [2020-08-18 15:30:20,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:30:20,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:20,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:30:20,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:30:20,075 INFO L87 Difference]: Start difference. First operand 69 states and 93 transitions. Second operand 13 states. [2020-08-18 15:30:20,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:20,598 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-18 15:30:20,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 15:30:20,599 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 15:30:20,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:20,600 INFO L225 Difference]: With dead ends: 94 [2020-08-18 15:30:20,600 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 15:30:20,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:30:20,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 15:30:20,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2020-08-18 15:30:20,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 15:30:20,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 106 transitions. [2020-08-18 15:30:20,608 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 106 transitions. Word has length 39 [2020-08-18 15:30:20,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:20,609 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 106 transitions. [2020-08-18 15:30:20,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:30:20,610 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 106 transitions. [2020-08-18 15:30:20,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 15:30:20,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:20,612 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:20,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 15:30:20,612 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:20,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:20,613 INFO L82 PathProgramCache]: Analyzing trace with hash -15546846, now seen corresponding path program 1 times [2020-08-18 15:30:20,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:20,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792439221] [2020-08-18 15:30:20,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:20,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:20,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:20,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:20,846 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:20,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792439221] [2020-08-18 15:30:20,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:20,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:30:20,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013153426] [2020-08-18 15:30:20,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:30:20,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:20,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:30:20,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:30:20,850 INFO L87 Difference]: Start difference. First operand 80 states and 106 transitions. Second operand 13 states. [2020-08-18 15:30:21,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:21,469 INFO L93 Difference]: Finished difference Result 107 states and 137 transitions. [2020-08-18 15:30:21,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 15:30:21,470 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-18 15:30:21,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:21,471 INFO L225 Difference]: With dead ends: 107 [2020-08-18 15:30:21,472 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 15:30:21,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2020-08-18 15:30:21,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 15:30:21,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82. [2020-08-18 15:30:21,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 15:30:21,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 109 transitions. [2020-08-18 15:30:21,477 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 109 transitions. Word has length 39 [2020-08-18 15:30:21,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:21,477 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 109 transitions. [2020-08-18 15:30:21,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:30:21,477 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 109 transitions. [2020-08-18 15:30:21,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 15:30:21,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:21,478 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:21,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 15:30:21,479 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:21,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:21,479 INFO L82 PathProgramCache]: Analyzing trace with hash 2037263357, now seen corresponding path program 1 times [2020-08-18 15:30:21,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:21,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968350122] [2020-08-18 15:30:21,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:21,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:21,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:21,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:21,683 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:21,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968350122] [2020-08-18 15:30:21,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:21,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:30:21,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045411143] [2020-08-18 15:30:21,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:30:21,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:21,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:30:21,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:30:21,685 INFO L87 Difference]: Start difference. First operand 82 states and 109 transitions. Second operand 13 states. [2020-08-18 15:30:22,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:22,303 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2020-08-18 15:30:22,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 15:30:22,303 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 15:30:22,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:22,304 INFO L225 Difference]: With dead ends: 109 [2020-08-18 15:30:22,304 INFO L226 Difference]: Without dead ends: 101 [2020-08-18 15:30:22,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:30:22,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-18 15:30:22,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 91. [2020-08-18 15:30:22,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 15:30:22,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 119 transitions. [2020-08-18 15:30:22,312 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 119 transitions. Word has length 41 [2020-08-18 15:30:22,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:22,313 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 119 transitions. [2020-08-18 15:30:22,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:30:22,313 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 119 transitions. [2020-08-18 15:30:22,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 15:30:22,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:22,314 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:22,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 15:30:22,314 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:22,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:22,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1233000963, now seen corresponding path program 3 times [2020-08-18 15:30:22,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:22,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274977993] [2020-08-18 15:30:22,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:22,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:22,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:30:22,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:30:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:30:22,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274977993] [2020-08-18 15:30:22,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:30:22,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:30:22,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980035498] [2020-08-18 15:30:22,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:30:22,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:30:22,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:30:22,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:30:22,631 INFO L87 Difference]: Start difference. First operand 91 states and 119 transitions. Second operand 13 states. [2020-08-18 15:30:23,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:30:23,393 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2020-08-18 15:30:23,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 15:30:23,394 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-18 15:30:23,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:30:23,395 INFO L225 Difference]: With dead ends: 116 [2020-08-18 15:30:23,395 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 15:30:23,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2020-08-18 15:30:23,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 15:30:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2020-08-18 15:30:23,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-08-18 15:30:23,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 128 transitions. [2020-08-18 15:30:23,403 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 128 transitions. Word has length 41 [2020-08-18 15:30:23,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:30:23,403 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 128 transitions. [2020-08-18 15:30:23,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:30:23,403 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 128 transitions. [2020-08-18 15:30:23,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 15:30:23,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:30:23,404 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:30:23,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 15:30:23,404 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:30:23,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:30:23,405 INFO L82 PathProgramCache]: Analyzing trace with hash -2006936899, now seen corresponding path program 1 times [2020-08-18 15:30:23,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:30:23,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469419018] [2020-08-18 15:30:23,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:30:23,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 15:30:23,424 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 15:30:23,425 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 15:30:23,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 15:30:23,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 03:30:23 BoogieIcfgContainer [2020-08-18 15:30:23,449 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 15:30:23,451 INFO L168 Benchmark]: Toolchain (without parser) took 10191.54 ms. Allocated memory was 141.6 MB in the beginning and 309.9 MB in the end (delta: 168.3 MB). Free memory was 102.9 MB in the beginning and 101.1 MB in the end (delta: 1.8 MB). Peak memory consumption was 170.1 MB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,452 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,453 INFO L168 Benchmark]: CACSL2BoogieTranslator took 693.82 ms. Allocated memory was 141.6 MB in the beginning and 205.0 MB in the end (delta: 63.4 MB). Free memory was 102.7 MB in the beginning and 170.3 MB in the end (delta: -67.6 MB). Peak memory consumption was 24.1 MB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,454 INFO L168 Benchmark]: Boogie Preprocessor took 79.03 ms. Allocated memory is still 205.0 MB. Free memory was 170.3 MB in the beginning and 167.1 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,454 INFO L168 Benchmark]: RCFGBuilder took 747.49 ms. Allocated memory is still 205.0 MB. Free memory was 167.1 MB in the beginning and 110.3 MB in the end (delta: 56.8 MB). Peak memory consumption was 56.8 MB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,455 INFO L168 Benchmark]: TraceAbstraction took 8665.24 ms. Allocated memory was 205.0 MB in the beginning and 309.9 MB in the end (delta: 104.9 MB). Free memory was 109.7 MB in the beginning and 101.1 MB in the end (delta: 8.6 MB). Peak memory consumption was 113.5 MB. Max. memory is 7.1 GB. [2020-08-18 15:30:23,458 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 693.82 ms. Allocated memory was 141.6 MB in the beginning and 205.0 MB in the end (delta: 63.4 MB). Free memory was 102.7 MB in the beginning and 170.3 MB in the end (delta: -67.6 MB). Peak memory consumption was 24.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 79.03 ms. Allocated memory is still 205.0 MB. Free memory was 170.3 MB in the beginning and 167.1 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 747.49 ms. Allocated memory is still 205.0 MB. Free memory was 167.1 MB in the beginning and 110.3 MB in the end (delta: 56.8 MB). Peak memory consumption was 56.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8665.24 ms. Allocated memory was 205.0 MB in the beginning and 309.9 MB in the end (delta: 104.9 MB). Free memory was 109.7 MB in the beginning and 101.1 MB in the end (delta: 8.6 MB). Peak memory consumption was 113.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 609]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L541] struct TreeNode* root = malloc(sizeof(*root)), *n; [L542] root->left = ((void *)0) [L543] root->right = ((void *)0) [L544] COND FALSE !(__VERIFIER_nondet_int()) [L563] n = ((void *)0) [L564] struct TreeNode* pred; [L565] COND TRUE \read(*root) [L566] pred = ((void *)0) [L567] n = root [L568] EXPR n->left [L568] n->left || n->right [L568] EXPR n->right [L568] n->left || n->right [L568] COND FALSE !(n->left || n->right) [L575] COND FALSE !(\read(*pred)) [L581] root = ((void *)0) [L565] COND FALSE !(\read(*root)) [L584] List a = (List) malloc(sizeof(struct node)); [L585] COND FALSE !(a == 0) [L586] List t; [L587] List p = a; [L588] COND TRUE __VERIFIER_nondet_int() [L589] p->h = 1 [L590] t = (List) malloc(sizeof(struct node)) [L591] COND FALSE !(t == 0) [L592] p->n = t [L593] EXPR p->n [L593] p = p->n [L588] COND FALSE !(__VERIFIER_nondet_int()) [L595] COND TRUE __VERIFIER_nondet_int() [L596] p->h = 2 [L597] t = (List) malloc(sizeof(struct node)) [L598] COND FALSE !(t == 0) [L599] p->n = t [L600] EXPR p->n [L600] p = p->n [L595] COND FALSE !(__VERIFIER_nondet_int()) [L602] p->h = 3 [L603] p = a [L604] EXPR p->h [L604] COND FALSE !(p->h == 2) [L606] EXPR p->h [L606] COND TRUE p->h == 1 [L607] EXPR p->n [L607] p = p->n [L606] EXPR p->h [L606] COND FALSE !(p->h == 1) [L608] EXPR p->h [L608] COND TRUE p->h != 3 [L609] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 64 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.5s, OverallIterations: 16, TraceHistogramMax: 3, AutomataDifference: 5.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 855 SDtfs, 581 SDslu, 3411 SDs, 0 SdLazy, 3002 SolverSat, 254 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 222 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 154 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 559 NumberOfCodeBlocks, 559 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 503 ConstructedInterpolants, 0 QuantifiedInterpolants, 106880 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 15 InterpolantComputations, 6 PerfectInterpolantSequences, 25/71 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...