/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 true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-21 14:57:13,848 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:57:13,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:57:13,895 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:57:13,896 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:57:13,905 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:57:13,907 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:57:13,911 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:57:13,914 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:57:13,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:57:13,918 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:57:13,919 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:57:13,919 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:57:13,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:57:13,925 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:57:13,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:57:13,928 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:57:13,929 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:57:13,931 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:57:13,939 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:57:13,940 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:57:13,941 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:57:13,942 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:57:13,945 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:57:13,948 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 14:57:13,948 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 14:57:13,948 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 14:57:13,949 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 14:57:13,949 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 14:57:13,950 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 14:57:13,950 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 14:57:13,951 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 14:57:13,952 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 14:57:13,952 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 14:57:13,953 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 14:57:13,953 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 14:57:13,954 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 14:57:13,954 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 14:57:13,954 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:57:13,955 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:57:13,956 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:57:13,957 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 [2020-08-21 14:57:13,978 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:57:13,978 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:57:13,979 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:57:13,979 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:57:13,980 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:57:13,980 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:57:13,980 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:57:13,980 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:57:13,980 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:57:13,981 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:57:13,981 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:57:13,981 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:57:13,981 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:57:13,981 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:57:13,982 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:57:13,982 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:57:13,982 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:57:13,982 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:57:13,982 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:57:13,983 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:57:13,983 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:57:13,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:57:13,983 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:57:13,983 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:57:13,984 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:57:13,984 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:57:13,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:57:13,984 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:57:13,989 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:57:13,989 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; [2020-08-21 14:57:14,294 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:57:14,314 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:57:14,320 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:57:14,322 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:57:14,323 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:57:14,325 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-21 14:57:14,398 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37c15de84/bd484ab43ecd44768b7e669c7c3e50a3/FLAGb05ed90b5 [2020-08-21 14:57:15,026 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:57:15,027 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext2-properties/list_and_tree_cnstr-1.i [2020-08-21 14:57:15,046 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37c15de84/bd484ab43ecd44768b7e669c7c3e50a3/FLAGb05ed90b5 [2020-08-21 14:57:15,284 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/37c15de84/bd484ab43ecd44768b7e669c7c3e50a3 [2020-08-21 14:57:15,294 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:57:15,296 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:57:15,297 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:57:15,297 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:57:15,301 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:57:15,302 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:15,305 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64d2a1ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15, skipping insertion in model container [2020-08-21 14:57:15,305 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:15,313 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:57:15,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:57:15,829 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:57:15,839 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:57:15,891 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:57:15,966 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:57:15,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15 WrapperNode [2020-08-21 14:57:15,968 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:57:15,968 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:57:15,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:57:15,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:57:15,979 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:15,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:15,997 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:15,998 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:16,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:16,030 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:16,034 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (1/1) ... [2020-08-21 14:57:16,041 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:57:16,042 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:57:16,042 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:57:16,042 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:57:16,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (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 [2020-08-21 14:57:16,106 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:57:16,106 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:57:16,106 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-21 14:57:16,106 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-21 14:57:16,106 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-21 14:57:16,107 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:57:16,107 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:57:16,107 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 14:57:16,107 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-21 14:57:16,107 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-21 14:57:16,107 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-21 14:57:16,108 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-21 14:57:16,109 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-21 14:57:16,110 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-21 14:57:16,111 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-21 14:57:16,112 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-21 14:57:16,113 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-21 14:57:16,114 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 14:57:16,115 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-21 14:57:16,116 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-21 14:57:16,117 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-21 14:57:16,118 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-21 14:57:16,119 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-21 14:57:16,120 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-21 14:57:16,121 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-21 14:57:16,122 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 14:57:16,123 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 14:57:16,124 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 14:57:16,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:57:16,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:57:16,124 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:57:16,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:57:16,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:57:16,472 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-21 14:57:16,851 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:57:16,851 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-08-21 14:57:16,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:57:16 BoogieIcfgContainer [2020-08-21 14:57:16,861 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:57:16,864 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:57:16,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:57:16,868 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:57:16,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:57:15" (1/3) ... [2020-08-21 14:57:16,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447f7b7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:57:16, skipping insertion in model container [2020-08-21 14:57:16,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:57:15" (2/3) ... [2020-08-21 14:57:16,871 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447f7b7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:57:16, skipping insertion in model container [2020-08-21 14:57:16,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:57:16" (3/3) ... [2020-08-21 14:57:16,873 INFO L109 eAbstractionObserver]: Analyzing ICFG list_and_tree_cnstr-1.i [2020-08-21 14:57:16,884 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:57:16,893 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:57:16,908 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:57:16,936 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:57:16,937 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:57:16,937 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:57:16,946 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:57:16,946 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:57:16,946 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:57:16,947 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:57:16,947 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:57:16,967 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states. [2020-08-21 14:57:16,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 14:57:16,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:16,975 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] [2020-08-21 14:57:16,975 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:16,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:16,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1575706012, now seen corresponding path program 1 times [2020-08-21 14:57:16,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:16,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445401818] [2020-08-21 14:57:16,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:17,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:17,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,182 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:57:17,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445401818] [2020-08-21 14:57:17,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:17,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:57:17,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203109530] [2020-08-21 14:57:17,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:57:17,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:17,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:57:17,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:57:17,209 INFO L87 Difference]: Start difference. First operand 57 states. Second operand 3 states. [2020-08-21 14:57:17,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:17,424 INFO L93 Difference]: Finished difference Result 108 states and 166 transitions. [2020-08-21 14:57:17,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:57:17,425 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-08-21 14:57:17,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:17,435 INFO L225 Difference]: With dead ends: 108 [2020-08-21 14:57:17,435 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 14:57:17,439 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 [2020-08-21 14:57:17,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 14:57:17,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 14:57:17,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 14:57:17,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2020-08-21 14:57:17,484 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 20 [2020-08-21 14:57:17,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:17,485 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2020-08-21 14:57:17,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:57:17,485 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2020-08-21 14:57:17,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 14:57:17,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:17,487 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] [2020-08-21 14:57:17,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:57:17,487 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:17,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:17,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1627887593, now seen corresponding path program 1 times [2020-08-21 14:57:17,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:17,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741512346] [2020-08-21 14:57:17,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:17,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:17,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:57:17,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741512346] [2020-08-21 14:57:17,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:17,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:57:17,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049520454] [2020-08-21 14:57:17,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:57:17,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:17,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:57:17,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:57:17,605 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand 4 states. [2020-08-21 14:57:17,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:17,749 INFO L93 Difference]: Finished difference Result 75 states and 101 transitions. [2020-08-21 14:57:17,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:57:17,750 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 25 [2020-08-21 14:57:17,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:17,753 INFO L225 Difference]: With dead ends: 75 [2020-08-21 14:57:17,753 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 14:57:17,754 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 [2020-08-21 14:57:17,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 14:57:17,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 14:57:17,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 14:57:17,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 77 transitions. [2020-08-21 14:57:17,764 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 77 transitions. Word has length 25 [2020-08-21 14:57:17,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:17,765 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 77 transitions. [2020-08-21 14:57:17,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:57:17,765 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 77 transitions. [2020-08-21 14:57:17,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:57:17,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:17,767 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] [2020-08-21 14:57:17,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:57:17,767 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:17,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:17,768 INFO L82 PathProgramCache]: Analyzing trace with hash -164754602, now seen corresponding path program 1 times [2020-08-21 14:57:17,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:17,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107420682] [2020-08-21 14:57:17,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:17,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:17,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:17,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:57:17,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107420682] [2020-08-21 14:57:17,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:17,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:57:17,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195695306] [2020-08-21 14:57:17,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:57:17,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:17,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:57:17,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:57:17,834 INFO L87 Difference]: Start difference. First operand 55 states and 77 transitions. Second operand 4 states. [2020-08-21 14:57:17,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:17,962 INFO L93 Difference]: Finished difference Result 93 states and 131 transitions. [2020-08-21 14:57:17,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:57:17,963 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 31 [2020-08-21 14:57:17,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:17,964 INFO L225 Difference]: With dead ends: 93 [2020-08-21 14:57:17,964 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 14:57:17,965 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 [2020-08-21 14:57:17,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 14:57:17,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 14:57:17,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 14:57:17,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2020-08-21 14:57:17,973 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2020-08-21 14:57:17,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:17,974 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2020-08-21 14:57:17,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:57:17,974 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2020-08-21 14:57:17,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:57:17,975 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:17,976 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] [2020-08-21 14:57:17,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:57:17,976 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:17,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:17,977 INFO L82 PathProgramCache]: Analyzing trace with hash -982403052, now seen corresponding path program 1 times [2020-08-21 14:57:17,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:17,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068906996] [2020-08-21 14:57:17,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:18,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:18,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:18,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068906996] [2020-08-21 14:57:18,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:18,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 14:57:18,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455100728] [2020-08-21 14:57:18,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:57:18,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:18,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:57:18,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:57:18,072 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand 6 states. [2020-08-21 14:57:18,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:18,298 INFO L93 Difference]: Finished difference Result 82 states and 108 transitions. [2020-08-21 14:57:18,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:57:18,299 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-08-21 14:57:18,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:18,300 INFO L225 Difference]: With dead ends: 82 [2020-08-21 14:57:18,300 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 14:57:18,301 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 [2020-08-21 14:57:18,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 14:57:18,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 66. [2020-08-21 14:57:18,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 14:57:18,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 91 transitions. [2020-08-21 14:57:18,311 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 91 transitions. Word has length 31 [2020-08-21 14:57:18,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:18,311 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 91 transitions. [2020-08-21 14:57:18,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:57:18,312 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 91 transitions. [2020-08-21 14:57:18,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:57:18,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:18,313 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] [2020-08-21 14:57:18,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:57:18,314 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:18,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:18,314 INFO L82 PathProgramCache]: Analyzing trace with hash 852152367, now seen corresponding path program 1 times [2020-08-21 14:57:18,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:18,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742676407] [2020-08-21 14:57:18,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:18,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:18,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:18,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742676407] [2020-08-21 14:57:18,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:18,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 14:57:18,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792584923] [2020-08-21 14:57:18,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:57:18,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:18,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:57:18,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:57:18,417 INFO L87 Difference]: Start difference. First operand 66 states and 91 transitions. Second operand 6 states. [2020-08-21 14:57:18,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:18,660 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-21 14:57:18,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:57:18,661 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-21 14:57:18,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:18,663 INFO L225 Difference]: With dead ends: 84 [2020-08-21 14:57:18,663 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 14:57:18,668 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 [2020-08-21 14:57:18,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 14:57:18,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2020-08-21 14:57:18,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 14:57:18,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 88 transitions. [2020-08-21 14:57:18,684 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 88 transitions. Word has length 33 [2020-08-21 14:57:18,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:18,685 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 88 transitions. [2020-08-21 14:57:18,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:57:18,685 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 88 transitions. [2020-08-21 14:57:18,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:57:18,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:18,688 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] [2020-08-21 14:57:18,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:57:18,690 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:18,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:18,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1876855343, now seen corresponding path program 1 times [2020-08-21 14:57:18,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:18,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453694671] [2020-08-21 14:57:18,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:18,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:18,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:18,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453694671] [2020-08-21 14:57:18,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:57:18,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 14:57:18,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027393638] [2020-08-21 14:57:18,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:57:18,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:18,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:57:18,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:57:18,813 INFO L87 Difference]: Start difference. First operand 64 states and 88 transitions. Second operand 6 states. [2020-08-21 14:57:19,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:19,003 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2020-08-21 14:57:19,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:57:19,003 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-21 14:57:19,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:19,004 INFO L225 Difference]: With dead ends: 84 [2020-08-21 14:57:19,005 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 14:57:19,005 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 [2020-08-21 14:57:19,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 14:57:19,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 61. [2020-08-21 14:57:19,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 14:57:19,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 84 transitions. [2020-08-21 14:57:19,015 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 84 transitions. Word has length 33 [2020-08-21 14:57:19,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:19,015 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 84 transitions. [2020-08-21 14:57:19,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:57:19,016 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 84 transitions. [2020-08-21 14:57:19,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 14:57:19,018 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:19,018 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] [2020-08-21 14:57:19,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:57:19,019 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:19,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:19,019 INFO L82 PathProgramCache]: Analyzing trace with hash -778946181, now seen corresponding path program 1 times [2020-08-21 14:57:19,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:19,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705988488] [2020-08-21 14:57:19,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:19,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:19,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:19,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:19,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:19,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705988488] [2020-08-21 14:57:19,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:19,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:57:19,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003801789] [2020-08-21 14:57:19,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:57:19,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:19,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:57:19,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:57:19,166 INFO L87 Difference]: Start difference. First operand 61 states and 84 transitions. Second operand 9 states. [2020-08-21 14:57:19,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:19,504 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2020-08-21 14:57:19,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:57:19,504 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-21 14:57:19,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:19,506 INFO L225 Difference]: With dead ends: 86 [2020-08-21 14:57:19,506 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 14:57:19,506 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 [2020-08-21 14:57:19,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 14:57:19,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 68. [2020-08-21 14:57:19,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 14:57:19,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 92 transitions. [2020-08-21 14:57:19,523 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 92 transitions. Word has length 35 [2020-08-21 14:57:19,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:19,524 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 92 transitions. [2020-08-21 14:57:19,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:57:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 92 transitions. [2020-08-21 14:57:19,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 14:57:19,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:19,526 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] [2020-08-21 14:57:19,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:57:19,526 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:19,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:19,526 INFO L82 PathProgramCache]: Analyzing trace with hash 84455483, now seen corresponding path program 1 times [2020-08-21 14:57:19,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:19,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867895241] [2020-08-21 14:57:19,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:19,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:19,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:19,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:19,647 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:19,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867895241] [2020-08-21 14:57:19,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:19,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:57:19,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789402072] [2020-08-21 14:57:19,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:57:19,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:19,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:57:19,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:57:19,650 INFO L87 Difference]: Start difference. First operand 68 states and 92 transitions. Second operand 9 states. [2020-08-21 14:57:19,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:19,999 INFO L93 Difference]: Finished difference Result 95 states and 123 transitions. [2020-08-21 14:57:20,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:57:20,000 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2020-08-21 14:57:20,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:20,001 INFO L225 Difference]: With dead ends: 95 [2020-08-21 14:57:20,001 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 14:57:20,002 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 [2020-08-21 14:57:20,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 14:57:20,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2020-08-21 14:57:20,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 14:57:20,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2020-08-21 14:57:20,008 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 35 [2020-08-21 14:57:20,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:20,009 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2020-08-21 14:57:20,009 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:57:20,009 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2020-08-21 14:57:20,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 14:57:20,010 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:20,010 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] [2020-08-21 14:57:20,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:57:20,011 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:20,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:20,011 INFO L82 PathProgramCache]: Analyzing trace with hash -169587242, now seen corresponding path program 1 times [2020-08-21 14:57:20,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:20,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179828651] [2020-08-21 14:57:20,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:20,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:20,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:20,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:20,207 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:20,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179828651] [2020-08-21 14:57:20,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:20,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:57:20,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909492903] [2020-08-21 14:57:20,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:57:20,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:20,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:57:20,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:57:20,209 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand 10 states. [2020-08-21 14:57:20,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:20,634 INFO L93 Difference]: Finished difference Result 99 states and 128 transitions. [2020-08-21 14:57:20,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:57:20,635 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-21 14:57:20,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:20,636 INFO L225 Difference]: With dead ends: 99 [2020-08-21 14:57:20,636 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 14:57:20,637 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 [2020-08-21 14:57:20,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 14:57:20,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 83. [2020-08-21 14:57:20,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 14:57:20,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 111 transitions. [2020-08-21 14:57:20,643 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 111 transitions. Word has length 37 [2020-08-21 14:57:20,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:20,644 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 111 transitions. [2020-08-21 14:57:20,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:57:20,644 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 111 transitions. [2020-08-21 14:57:20,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:57:20,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:20,645 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] [2020-08-21 14:57:20,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:57:20,646 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:20,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:20,646 INFO L82 PathProgramCache]: Analyzing trace with hash 284097905, now seen corresponding path program 1 times [2020-08-21 14:57:20,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:20,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905887479] [2020-08-21 14:57:20,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:20,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:20,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:20,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:20,853 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:20,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905887479] [2020-08-21 14:57:20,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:20,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:57:20,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573768862] [2020-08-21 14:57:20,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:57:20,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:20,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:57:20,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:57:20,856 INFO L87 Difference]: Start difference. First operand 83 states and 111 transitions. Second operand 10 states. [2020-08-21 14:57:21,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:21,239 INFO L93 Difference]: Finished difference Result 101 states and 130 transitions. [2020-08-21 14:57:21,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:57:21,242 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-21 14:57:21,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:21,243 INFO L225 Difference]: With dead ends: 101 [2020-08-21 14:57:21,243 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 14:57:21,244 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 [2020-08-21 14:57:21,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 14:57:21,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 74. [2020-08-21 14:57:21,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 14:57:21,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 99 transitions. [2020-08-21 14:57:21,250 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 99 transitions. Word has length 39 [2020-08-21 14:57:21,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:21,250 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 99 transitions. [2020-08-21 14:57:21,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:57:21,250 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 99 transitions. [2020-08-21 14:57:21,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:57:21,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:21,251 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] [2020-08-21 14:57:21,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:57:21,252 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:21,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:21,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1308800881, now seen corresponding path program 2 times [2020-08-21 14:57:21,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:21,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890992560] [2020-08-21 14:57:21,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:21,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:21,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:21,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:21,489 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:21,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890992560] [2020-08-21 14:57:21,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:21,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:57:21,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160234794] [2020-08-21 14:57:21,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:57:21,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:21,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:57:21,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:57:21,491 INFO L87 Difference]: Start difference. First operand 74 states and 99 transitions. Second operand 10 states. [2020-08-21 14:57:21,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:21,955 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-21 14:57:21,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:57:21,956 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2020-08-21 14:57:21,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:21,957 INFO L225 Difference]: With dead ends: 94 [2020-08-21 14:57:21,957 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 14:57:21,958 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 [2020-08-21 14:57:21,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 14:57:21,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2020-08-21 14:57:21,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 14:57:21,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 93 transitions. [2020-08-21 14:57:21,962 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 93 transitions. Word has length 39 [2020-08-21 14:57:21,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:21,963 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 93 transitions. [2020-08-21 14:57:21,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:57:21,963 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 93 transitions. [2020-08-21 14:57:21,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:57:21,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:21,964 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] [2020-08-21 14:57:21,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:57:21,964 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:21,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:21,965 INFO L82 PathProgramCache]: Analyzing trace with hash -315248798, now seen corresponding path program 2 times [2020-08-21 14:57:21,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:21,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875302273] [2020-08-21 14:57:21,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:21,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:22,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:22,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:22,141 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:22,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875302273] [2020-08-21 14:57:22,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:22,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:57:22,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389921588] [2020-08-21 14:57:22,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:57:22,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:22,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:57:22,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:57:22,143 INFO L87 Difference]: Start difference. First operand 69 states and 93 transitions. Second operand 13 states. [2020-08-21 14:57:22,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:22,707 INFO L93 Difference]: Finished difference Result 94 states and 121 transitions. [2020-08-21 14:57:22,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:57:22,708 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-21 14:57:22,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:22,709 INFO L225 Difference]: With dead ends: 94 [2020-08-21 14:57:22,709 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 14:57:22,710 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 [2020-08-21 14:57:22,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 14:57:22,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 80. [2020-08-21 14:57:22,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 14:57:22,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 106 transitions. [2020-08-21 14:57:22,718 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 106 transitions. Word has length 39 [2020-08-21 14:57:22,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:22,720 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 106 transitions. [2020-08-21 14:57:22,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:57:22,720 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 106 transitions. [2020-08-21 14:57:22,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:57:22,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:22,723 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] [2020-08-21 14:57:22,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:57:22,723 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:22,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:22,724 INFO L82 PathProgramCache]: Analyzing trace with hash -15546846, now seen corresponding path program 1 times [2020-08-21 14:57:22,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:22,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29965448] [2020-08-21 14:57:22,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:22,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:22,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:22,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:22,918 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:22,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29965448] [2020-08-21 14:57:22,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:22,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:57:22,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180890357] [2020-08-21 14:57:22,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:57:22,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:22,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:57:22,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:57:22,924 INFO L87 Difference]: Start difference. First operand 80 states and 106 transitions. Second operand 13 states. [2020-08-21 14:57:23,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:23,536 INFO L93 Difference]: Finished difference Result 107 states and 137 transitions. [2020-08-21 14:57:23,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:57:23,537 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2020-08-21 14:57:23,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:23,538 INFO L225 Difference]: With dead ends: 107 [2020-08-21 14:57:23,538 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 14:57:23,539 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 [2020-08-21 14:57:23,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 14:57:23,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82. [2020-08-21 14:57:23,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 14:57:23,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 109 transitions. [2020-08-21 14:57:23,544 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 109 transitions. Word has length 39 [2020-08-21 14:57:23,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:23,544 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 109 transitions. [2020-08-21 14:57:23,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:57:23,545 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 109 transitions. [2020-08-21 14:57:23,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:57:23,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:23,546 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] [2020-08-21 14:57:23,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:57:23,546 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:23,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:23,546 INFO L82 PathProgramCache]: Analyzing trace with hash 2037263357, now seen corresponding path program 1 times [2020-08-21 14:57:23,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:23,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171245054] [2020-08-21 14:57:23,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:23,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:23,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:23,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:23,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171245054] [2020-08-21 14:57:23,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:23,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:57:23,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120108770] [2020-08-21 14:57:23,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:57:23,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:23,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:57:23,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:57:23,726 INFO L87 Difference]: Start difference. First operand 82 states and 109 transitions. Second operand 13 states. [2020-08-21 14:57:24,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:24,281 INFO L93 Difference]: Finished difference Result 109 states and 139 transitions. [2020-08-21 14:57:24,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:57:24,282 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-21 14:57:24,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:24,284 INFO L225 Difference]: With dead ends: 109 [2020-08-21 14:57:24,285 INFO L226 Difference]: Without dead ends: 101 [2020-08-21 14:57:24,286 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 [2020-08-21 14:57:24,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-21 14:57:24,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 91. [2020-08-21 14:57:24,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 14:57:24,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 119 transitions. [2020-08-21 14:57:24,292 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 119 transitions. Word has length 41 [2020-08-21 14:57:24,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:24,292 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 119 transitions. [2020-08-21 14:57:24,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:57:24,293 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 119 transitions. [2020-08-21 14:57:24,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:57:24,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:24,294 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] [2020-08-21 14:57:24,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 14:57:24,295 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:24,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:24,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1233000963, now seen corresponding path program 3 times [2020-08-21 14:57:24,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:24,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227055904] [2020-08-21 14:57:24,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:24,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:24,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:57:24,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:57:24,704 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 14:57:24,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227055904] [2020-08-21 14:57:24,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:57:24,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:57:24,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324709927] [2020-08-21 14:57:24,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:57:24,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:57:24,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:57:24,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:57:24,706 INFO L87 Difference]: Start difference. First operand 91 states and 119 transitions. Second operand 13 states. [2020-08-21 14:57:25,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:57:25,444 INFO L93 Difference]: Finished difference Result 116 states and 148 transitions. [2020-08-21 14:57:25,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:57:25,445 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2020-08-21 14:57:25,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:57:25,446 INFO L225 Difference]: With dead ends: 116 [2020-08-21 14:57:25,446 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 14:57:25,447 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 [2020-08-21 14:57:25,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 14:57:25,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 98. [2020-08-21 14:57:25,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-08-21 14:57:25,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 128 transitions. [2020-08-21 14:57:25,453 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 128 transitions. Word has length 41 [2020-08-21 14:57:25,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:57:25,453 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 128 transitions. [2020-08-21 14:57:25,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:57:25,454 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 128 transitions. [2020-08-21 14:57:25,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:57:25,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:57:25,454 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] [2020-08-21 14:57:25,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 14:57:25,455 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:57:25,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:57:25,455 INFO L82 PathProgramCache]: Analyzing trace with hash -2006936899, now seen corresponding path program 1 times [2020-08-21 14:57:25,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:57:25,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076743548] [2020-08-21 14:57:25,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:57:25,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:57:25,476 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:57:25,476 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:57:25,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 14:57:25,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:57:25 BoogieIcfgContainer [2020-08-21 14:57:25,499 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:57:25,501 INFO L168 Benchmark]: Toolchain (without parser) took 10205.00 ms. Allocated memory was 140.5 MB in the beginning and 313.5 MB in the end (delta: 173.0 MB). Free memory was 101.9 MB in the beginning and 144.2 MB in the end (delta: -42.4 MB). Peak memory consumption was 130.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,502 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,503 INFO L168 Benchmark]: CACSL2BoogieTranslator took 670.83 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 101.7 MB in the beginning and 166.2 MB in the end (delta: -64.6 MB). Peak memory consumption was 21.9 MB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,504 INFO L168 Benchmark]: Boogie Preprocessor took 73.21 ms. Allocated memory is still 202.9 MB. Free memory was 166.2 MB in the beginning and 162.9 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,504 INFO L168 Benchmark]: RCFGBuilder took 819.93 ms. Allocated memory is still 202.9 MB. Free memory was 162.9 MB in the beginning and 106.0 MB in the end (delta: 56.9 MB). Peak memory consumption was 56.9 MB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,505 INFO L168 Benchmark]: TraceAbstraction took 8634.39 ms. Allocated memory was 202.9 MB in the beginning and 313.5 MB in the end (delta: 110.6 MB). Free memory was 105.4 MB in the beginning and 144.2 MB in the end (delta: -38.8 MB). Peak memory consumption was 71.8 MB. Max. memory is 7.1 GB. [2020-08-21 14:57:25,508 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 670.83 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 101.7 MB in the beginning and 166.2 MB in the end (delta: -64.6 MB). Peak memory consumption was 21.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 73.21 ms. Allocated memory is still 202.9 MB. Free memory was 166.2 MB in the beginning and 162.9 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 819.93 ms. Allocated memory is still 202.9 MB. Free memory was 162.9 MB in the beginning and 106.0 MB in the end (delta: 56.9 MB). Peak memory consumption was 56.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8634.39 ms. Allocated memory was 202.9 MB in the beginning and 313.5 MB in the end (delta: 110.6 MB). Free memory was 105.4 MB in the beginning and 144.2 MB in the end (delta: -38.8 MB). Peak memory consumption was 71.8 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...