/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:42:45,456 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:42:45,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:42:45,503 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 16:42:45,504 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 16:42:45,515 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 16:42:45,518 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 16:42:45,521 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 16:42:45,522 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 16:42:45,523 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 16:42:45,524 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 16:42:45,526 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 16:42:45,526 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:42:45,527 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:42:45,529 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:42:45,530 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:42:45,531 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:42:45,532 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:42:45,534 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:42:45,536 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:42:45,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:42:45,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:42:45,540 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:42:45,541 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:42:45,543 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 16:42:45,544 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 16:42:45,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 16:42:45,545 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 16:42:45,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 16:42:45,547 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-04 16:42:45,547 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 16:42:45,548 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 16:42:45,549 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 16:42:45,550 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 16:42:45,551 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 16:42:45,551 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 16:42:45,552 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 16:42:45,552 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 16:42:45,552 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 16:42:45,553 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 16:42:45,554 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 16:42:45,555 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:42:45,567 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:42:45,567 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:42:45,569 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:42:45,569 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:42:45,569 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:42:45,569 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:42:45,570 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:42:45,570 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:42:45,570 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:42:45,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:42:45,570 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:42:45,571 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:42:45,571 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:42:45,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:42:45,571 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:42:45,571 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:42:45,572 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:42:45,572 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:42:45,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:42:45,572 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:42:45,572 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:42:45,573 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:42:45,573 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:42:46,021 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:42:46,049 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:42:46,055 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:42:46,057 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:42:46,058 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:42:46,059 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-09-04 16:42:46,154 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/550e07e73/2af4d6ba9a53496e91b2e202dc7d41b6/FLAGd0c827e6f [2020-09-04 16:42:46,804 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:42:46,804 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-09-04 16:42:46,819 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/550e07e73/2af4d6ba9a53496e91b2e202dc7d41b6/FLAGd0c827e6f [2020-09-04 16:42:47,027 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/550e07e73/2af4d6ba9a53496e91b2e202dc7d41b6 [2020-09-04 16:42:47,041 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:42:47,043 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:42:47,045 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:42:47,045 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:42:47,049 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:42:47,050 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,054 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c0b7ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47, skipping insertion in model container [2020-09-04 16:42:47,054 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:42:47,116 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:42:47,651 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:42:47,666 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:42:47,749 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:42:47,822 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:42:47,823 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47 WrapperNode [2020-09-04 16:42:47,823 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:42:47,824 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:42:47,825 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:42:47,825 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:42:47,843 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,843 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,861 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,876 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,883 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,886 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... [2020-09-04 16:42:47,897 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:42:47,898 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:42:47,901 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:42:47,901 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:42:47,904 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:42:47,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:42:47,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:42:47,984 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-09-04 16:42:47,984 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-09-04 16:42:47,985 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-09-04 16:42:47,985 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2020-09-04 16:42:47,985 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2020-09-04 16:42:47,985 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2020-09-04 16:42:47,985 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:42:47,985 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:42:47,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 16:42:47,986 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-09-04 16:42:47,986 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-09-04 16:42:47,986 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-09-04 16:42:47,986 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-09-04 16:42:47,987 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-09-04 16:42:47,987 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-09-04 16:42:47,987 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-09-04 16:42:47,987 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-09-04 16:42:47,987 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-09-04 16:42:47,988 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-09-04 16:42:47,988 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-09-04 16:42:47,988 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-09-04 16:42:47,988 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-09-04 16:42:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-09-04 16:42:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-09-04 16:42:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-09-04 16:42:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-09-04 16:42:47,989 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-09-04 16:42:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-09-04 16:42:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-09-04 16:42:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-09-04 16:42:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-09-04 16:42:47,990 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-09-04 16:42:47,991 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-09-04 16:42:47,992 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-09-04 16:42:47,993 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-09-04 16:42:47,994 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-09-04 16:42:47,995 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-09-04 16:42:47,996 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-09-04 16:42:47,997 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-09-04 16:42:47,998 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-09-04 16:42:47,999 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-09-04 16:42:48,000 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-09-04 16:42:48,001 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-09-04 16:42:48,002 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-09-04 16:42:48,003 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2020-09-04 16:42:48,004 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-09-04 16:42:48,005 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2020-09-04 16:42:48,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 16:42:48,005 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:42:48,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:42:48,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:42:48,362 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-09-04 16:42:48,594 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:42:48,595 INFO L295 CfgBuilder]: Removed 4 assume(true) statements. [2020-09-04 16:42:48,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:42:48 BoogieIcfgContainer [2020-09-04 16:42:48,600 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:42:48,602 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:42:48,602 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:42:48,606 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:42:48,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:42:47" (1/3) ... [2020-09-04 16:42:48,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@765210fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:42:48, skipping insertion in model container [2020-09-04 16:42:48,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:42:47" (2/3) ... [2020-09-04 16:42:48,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@765210fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:42:48, skipping insertion in model container [2020-09-04 16:42:48,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:42:48" (3/3) ... [2020-09-04 16:42:48,610 INFO L109 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2020-09-04 16:42:48,622 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:42:48,632 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:42:48,653 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:42:48,678 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:42:48,678 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:42:48,678 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:42:48,678 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:42:48,679 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:42:48,679 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:42:48,679 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:42:48,679 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:42:48,695 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-09-04 16:42:48,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 16:42:48,708 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:48,709 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] [2020-09-04 16:42:48,710 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:48,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:48,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1731717969, now seen corresponding path program 1 times [2020-09-04 16:42:48,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:48,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1184124653] [2020-09-04 16:42:48,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:48,808 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:48,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:48,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:48,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:48,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-09-04 16:42:48,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:48,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2020-09-04 16:42:48,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:49,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1184124653] [2020-09-04 16:42:49,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:49,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-04 16:42:49,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916232854] [2020-09-04 16:42:49,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-04 16:42:49,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:49,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-04 16:42:49,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-04 16:42:49,037 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 4 states. [2020-09-04 16:42:49,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:49,323 INFO L93 Difference]: Finished difference Result 154 states and 184 transitions. [2020-09-04 16:42:49,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 16:42:49,325 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2020-09-04 16:42:49,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:49,338 INFO L225 Difference]: With dead ends: 154 [2020-09-04 16:42:49,338 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 16:42:49,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:42:49,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 16:42:49,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 55. [2020-09-04 16:42:49,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-04 16:42:49,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-09-04 16:42:49,401 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 29 [2020-09-04 16:42:49,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:49,402 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-09-04 16:42:49,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-04 16:42:49,402 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-09-04 16:42:49,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 16:42:49,404 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:49,404 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, 1, 1] [2020-09-04 16:42:49,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:42:49,405 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:49,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:49,405 INFO L82 PathProgramCache]: Analyzing trace with hash 632987872, now seen corresponding path program 1 times [2020-09-04 16:42:49,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:49,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501861672] [2020-09-04 16:42:49,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:49,410 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:49,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:49,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:49,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:49,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-09-04 16:42:49,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:49,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-09-04 16:42:49,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:49,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:49,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501861672] [2020-09-04 16:42:49,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:49,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-09-04 16:42:49,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369715813] [2020-09-04 16:42:49,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 16:42:49,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:49,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 16:42:49,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:42:49,568 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 6 states. [2020-09-04 16:42:49,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:49,922 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2020-09-04 16:42:49,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 16:42:49,923 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-09-04 16:42:49,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:49,925 INFO L225 Difference]: With dead ends: 143 [2020-09-04 16:42:49,925 INFO L226 Difference]: Without dead ends: 96 [2020-09-04 16:42:49,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-09-04 16:42:49,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-04 16:42:49,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 57. [2020-09-04 16:42:49,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-04 16:42:49,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-09-04 16:42:49,944 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 33 [2020-09-04 16:42:49,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:49,945 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-09-04 16:42:49,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 16:42:49,945 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-09-04 16:42:49,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-04 16:42:49,946 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:49,947 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, 1, 1, 1, 1] [2020-09-04 16:42:49,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:42:49,947 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:49,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:49,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1134974621, now seen corresponding path program 1 times [2020-09-04 16:42:49,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:49,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597389125] [2020-09-04 16:42:49,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:49,952 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:49,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:50,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:50,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2020-09-04 16:42:50,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:50,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597389125] [2020-09-04 16:42:50,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:50,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:42:50,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011241858] [2020-09-04 16:42:50,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:42:50,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:50,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:42:50,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:42:50,179 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 7 states. [2020-09-04 16:42:50,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:50,578 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2020-09-04 16:42:50,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 16:42:50,579 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 35 [2020-09-04 16:42:50,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:50,581 INFO L225 Difference]: With dead ends: 114 [2020-09-04 16:42:50,581 INFO L226 Difference]: Without dead ends: 94 [2020-09-04 16:42:50,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:42:50,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-09-04 16:42:50,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 67. [2020-09-04 16:42:50,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-09-04 16:42:50,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2020-09-04 16:42:50,599 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 35 [2020-09-04 16:42:50,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:50,600 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2020-09-04 16:42:50,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:42:50,600 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2020-09-04 16:42:50,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-04 16:42:50,603 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:50,603 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:50,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:42:50,604 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:50,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:50,604 INFO L82 PathProgramCache]: Analyzing trace with hash 226602169, now seen corresponding path program 1 times [2020-09-04 16:42:50,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:50,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677948824] [2020-09-04 16:42:50,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:50,642 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:50,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:50,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-09-04 16:42:50,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2020-09-04 16:42:50,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:50,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:50,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677948824] [2020-09-04 16:42:50,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:50,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-04 16:42:50,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748760015] [2020-09-04 16:42:50,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 16:42:50,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:50,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 16:42:50,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-04 16:42:50,752 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand 8 states. [2020-09-04 16:42:51,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:51,232 INFO L93 Difference]: Finished difference Result 168 states and 182 transitions. [2020-09-04 16:42:51,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 16:42:51,232 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 43 [2020-09-04 16:42:51,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:51,234 INFO L225 Difference]: With dead ends: 168 [2020-09-04 16:42:51,235 INFO L226 Difference]: Without dead ends: 117 [2020-09-04 16:42:51,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-09-04 16:42:51,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-09-04 16:42:51,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 74. [2020-09-04 16:42:51,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-09-04 16:42:51,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2020-09-04 16:42:51,261 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 43 [2020-09-04 16:42:51,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:51,262 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2020-09-04 16:42:51,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 16:42:51,262 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2020-09-04 16:42:51,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-04 16:42:51,270 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:51,270 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:51,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:42:51,270 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:51,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:51,271 INFO L82 PathProgramCache]: Analyzing trace with hash 360366586, now seen corresponding path program 1 times [2020-09-04 16:42:51,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:51,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147025075] [2020-09-04 16:42:51,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:51,287 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:51,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:51,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:51,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:51,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:51,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:51,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-04 16:42:51,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:51,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:51,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147025075] [2020-09-04 16:42:51,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:51,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-09-04 16:42:51,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479048577] [2020-09-04 16:42:51,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 16:42:51,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:51,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 16:42:51,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-09-04 16:42:51,514 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 12 states. [2020-09-04 16:42:52,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:52,066 INFO L93 Difference]: Finished difference Result 101 states and 108 transitions. [2020-09-04 16:42:52,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 16:42:52,066 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2020-09-04 16:42:52,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:52,070 INFO L225 Difference]: With dead ends: 101 [2020-09-04 16:42:52,070 INFO L226 Difference]: Without dead ends: 96 [2020-09-04 16:42:52,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2020-09-04 16:42:52,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-04 16:42:52,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 81. [2020-09-04 16:42:52,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-09-04 16:42:52,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2020-09-04 16:42:52,090 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 44 [2020-09-04 16:42:52,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:52,091 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2020-09-04 16:42:52,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 16:42:52,091 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2020-09-04 16:42:52,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-04 16:42:52,092 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:52,092 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:52,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 16:42:52,093 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:52,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:52,093 INFO L82 PathProgramCache]: Analyzing trace with hash -829611268, now seen corresponding path program 1 times [2020-09-04 16:42:52,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:52,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1893891256] [2020-09-04 16:42:52,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:52,102 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:52,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:52,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-09-04 16:42:52,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-09-04 16:42:52,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:52,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1893891256] [2020-09-04 16:42:52,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:52,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 16:42:52,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923205681] [2020-09-04 16:42:52,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 16:42:52,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:52,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 16:42:52,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:42:52,223 INFO L87 Difference]: Start difference. First operand 81 states and 89 transitions. Second operand 9 states. [2020-09-04 16:42:52,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:52,646 INFO L93 Difference]: Finished difference Result 117 states and 124 transitions. [2020-09-04 16:42:52,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 16:42:52,647 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2020-09-04 16:42:52,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:52,648 INFO L225 Difference]: With dead ends: 117 [2020-09-04 16:42:52,648 INFO L226 Difference]: Without dead ends: 87 [2020-09-04 16:42:52,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2020-09-04 16:42:52,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-09-04 16:42:52,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 69. [2020-09-04 16:42:52,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-09-04 16:42:52,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2020-09-04 16:42:52,663 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 45 [2020-09-04 16:42:52,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:52,664 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2020-09-04 16:42:52,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 16:42:52,664 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2020-09-04 16:42:52,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-04 16:42:52,665 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:52,665 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:52,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 16:42:52,666 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:52,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:52,666 INFO L82 PathProgramCache]: Analyzing trace with hash -642872939, now seen corresponding path program 1 times [2020-09-04 16:42:52,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:52,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241476535] [2020-09-04 16:42:52,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:52,675 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:52,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:52,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:52,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-09-04 16:42:52,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:52,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:52,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241476535] [2020-09-04 16:42:52,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:52,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 16:42:52,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963090197] [2020-09-04 16:42:52,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 16:42:52,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:52,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 16:42:52,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:42:52,801 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand 9 states. [2020-09-04 16:42:53,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:53,165 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2020-09-04 16:42:53,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 16:42:53,166 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2020-09-04 16:42:53,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:53,172 INFO L225 Difference]: With dead ends: 120 [2020-09-04 16:42:53,172 INFO L226 Difference]: Without dead ends: 99 [2020-09-04 16:42:53,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-09-04 16:42:53,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-09-04 16:42:53,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 84. [2020-09-04 16:42:53,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-09-04 16:42:53,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2020-09-04 16:42:53,212 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 51 [2020-09-04 16:42:53,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:53,213 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2020-09-04 16:42:53,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 16:42:53,213 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2020-09-04 16:42:53,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-04 16:42:53,216 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:53,217 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:53,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 16:42:53,217 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:53,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:53,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1372689452, now seen corresponding path program 2 times [2020-09-04 16:42:53,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:53,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678752783] [2020-09-04 16:42:53,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:53,232 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:53,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:53,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:53,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-09-04 16:42:53,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:53,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [678752783] [2020-09-04 16:42:53,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:53,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-09-04 16:42:53,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423606654] [2020-09-04 16:42:53,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 16:42:53,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:53,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 16:42:53,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:42:53,434 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 11 states. [2020-09-04 16:42:53,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:53,826 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2020-09-04 16:42:53,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 16:42:53,827 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 60 [2020-09-04 16:42:53,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:53,828 INFO L225 Difference]: With dead ends: 132 [2020-09-04 16:42:53,829 INFO L226 Difference]: Without dead ends: 111 [2020-09-04 16:42:53,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2020-09-04 16:42:53,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-09-04 16:42:53,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 93. [2020-09-04 16:42:53,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-04 16:42:53,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 100 transitions. [2020-09-04 16:42:53,866 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 100 transitions. Word has length 60 [2020-09-04 16:42:53,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:53,867 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 100 transitions. [2020-09-04 16:42:53,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 16:42:53,867 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 100 transitions. [2020-09-04 16:42:53,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-09-04 16:42:53,869 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:53,869 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:53,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 16:42:53,870 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:53,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:53,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1521110738, now seen corresponding path program 1 times [2020-09-04 16:42:53,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:53,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1864190073] [2020-09-04 16:42:53,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:53,879 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:53,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:53,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:53,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-09-04 16:42:53,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-09-04 16:42:54,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:54,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1864190073] [2020-09-04 16:42:54,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:54,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-09-04 16:42:54,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483730417] [2020-09-04 16:42:54,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 16:42:54,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:54,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 16:42:54,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-09-04 16:42:54,024 INFO L87 Difference]: Start difference. First operand 93 states and 100 transitions. Second operand 11 states. [2020-09-04 16:42:54,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:54,542 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2020-09-04 16:42:54,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 16:42:54,543 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 61 [2020-09-04 16:42:54,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:54,544 INFO L225 Difference]: With dead ends: 125 [2020-09-04 16:42:54,544 INFO L226 Difference]: Without dead ends: 101 [2020-09-04 16:42:54,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2020-09-04 16:42:54,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-09-04 16:42:54,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 93. [2020-09-04 16:42:54,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-09-04 16:42:54,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2020-09-04 16:42:54,575 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 61 [2020-09-04 16:42:54,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:54,575 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2020-09-04 16:42:54,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 16:42:54,576 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2020-09-04 16:42:54,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-04 16:42:54,577 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:54,577 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:54,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 16:42:54,577 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:54,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:54,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1187742581, now seen corresponding path program 3 times [2020-09-04 16:42:54,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:54,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116583951] [2020-09-04 16:42:54,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:54,589 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:54,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:54,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-09-04 16:42:54,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:54,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:54,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116583951] [2020-09-04 16:42:54,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:54,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2020-09-04 16:42:54,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033208959] [2020-09-04 16:42:54,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-04 16:42:54,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:54,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-04 16:42:54,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-09-04 16:42:54,941 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand 17 states. [2020-09-04 16:42:55,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:55,908 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2020-09-04 16:42:55,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 16:42:55,908 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 69 [2020-09-04 16:42:55,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:55,910 INFO L225 Difference]: With dead ends: 113 [2020-09-04 16:42:55,910 INFO L226 Difference]: Without dead ends: 105 [2020-09-04 16:42:55,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 16:42:55,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-09-04 16:42:55,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2020-09-04 16:42:55,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-04 16:42:55,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2020-09-04 16:42:55,928 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 69 [2020-09-04 16:42:55,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:55,929 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2020-09-04 16:42:55,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-04 16:42:55,929 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2020-09-04 16:42:55,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-09-04 16:42:55,930 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:55,930 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:55,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 16:42:55,931 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:55,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:55,931 INFO L82 PathProgramCache]: Analyzing trace with hash 979580858, now seen corresponding path program 4 times [2020-09-04 16:42:55,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:55,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406887305] [2020-09-04 16:42:55,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:55,939 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:56,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:56,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:56,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-09-04 16:42:56,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:56,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-09-04 16:42:56,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:56,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:56,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406887305] [2020-09-04 16:42:56,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:56,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-09-04 16:42:56,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688610844] [2020-09-04 16:42:56,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 16:42:56,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:56,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 16:42:56,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-09-04 16:42:56,250 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand 12 states. [2020-09-04 16:42:56,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:56,887 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2020-09-04 16:42:56,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 16:42:56,888 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 76 [2020-09-04 16:42:56,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:56,890 INFO L225 Difference]: With dead ends: 125 [2020-09-04 16:42:56,890 INFO L226 Difference]: Without dead ends: 120 [2020-09-04 16:42:56,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-09-04 16:42:56,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-09-04 16:42:56,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 113. [2020-09-04 16:42:56,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-09-04 16:42:56,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2020-09-04 16:42:56,915 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 76 [2020-09-04 16:42:56,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:56,916 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2020-09-04 16:42:56,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 16:42:56,916 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2020-09-04 16:42:56,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-09-04 16:42:56,917 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:56,917 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:42:56,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 16:42:56,918 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:56,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:56,918 INFO L82 PathProgramCache]: Analyzing trace with hash -446623556, now seen corresponding path program 2 times [2020-09-04 16:42:56,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:56,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636585282] [2020-09-04 16:42:56,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:56,943 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:56,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:57,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:42:57,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:57,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-09-04 16:42:57,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:57,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-09-04 16:42:57,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:42:57,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:42:57,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636585282] [2020-09-04 16:42:57,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:42:57,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-09-04 16:42:57,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644706614] [2020-09-04 16:42:57,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 16:42:57,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:42:57,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 16:42:57,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-09-04 16:42:57,134 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand 13 states. [2020-09-04 16:42:57,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:42:57,649 INFO L93 Difference]: Finished difference Result 163 states and 171 transitions. [2020-09-04 16:42:57,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-04 16:42:57,649 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-09-04 16:42:57,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:42:57,651 INFO L225 Difference]: With dead ends: 163 [2020-09-04 16:42:57,651 INFO L226 Difference]: Without dead ends: 122 [2020-09-04 16:42:57,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=447, Unknown=0, NotChecked=0, Total=552 [2020-09-04 16:42:57,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-09-04 16:42:57,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 110. [2020-09-04 16:42:57,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-09-04 16:42:57,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 117 transitions. [2020-09-04 16:42:57,675 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 117 transitions. Word has length 77 [2020-09-04 16:42:57,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:42:57,675 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 117 transitions. [2020-09-04 16:42:57,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 16:42:57,675 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 117 transitions. [2020-09-04 16:42:57,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-09-04 16:42:57,677 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:42:57,677 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2020-09-04 16:42:57,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-04 16:42:57,677 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:42:57,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:42:57,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1305863211, now seen corresponding path program 5 times [2020-09-04 16:42:57,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:42:57,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077207871] [2020-09-04 16:42:57,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:42:57,688 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:42:57,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:42:57,737 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:42:57,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:42:57,783 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:42:57,852 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 16:42:57,852 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 16:42:57,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-04 16:42:57,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:42:57 BoogieIcfgContainer [2020-09-04 16:42:57,884 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:42:57,893 INFO L168 Benchmark]: Toolchain (without parser) took 10843.59 ms. Allocated memory was 139.5 MB in the beginning and 322.4 MB in the end (delta: 183.0 MB). Free memory was 102.8 MB in the beginning and 163.8 MB in the end (delta: -61.0 MB). Peak memory consumption was 121.9 MB. Max. memory is 7.1 GB. [2020-09-04 16:42:57,894 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 139.5 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. [2020-09-04 16:42:57,895 INFO L168 Benchmark]: CACSL2BoogieTranslator took 779.07 ms. Allocated memory was 139.5 MB in the beginning and 206.0 MB in the end (delta: 66.6 MB). Free memory was 102.6 MB in the beginning and 172.7 MB in the end (delta: -70.1 MB). Peak memory consumption was 26.2 MB. Max. memory is 7.1 GB. [2020-09-04 16:42:57,896 INFO L168 Benchmark]: Boogie Preprocessor took 73.12 ms. Allocated memory is still 206.0 MB. Free memory was 172.7 MB in the beginning and 170.0 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-09-04 16:42:57,897 INFO L168 Benchmark]: RCFGBuilder took 702.66 ms. Allocated memory is still 206.0 MB. Free memory was 170.0 MB in the beginning and 124.4 MB in the end (delta: 45.6 MB). Peak memory consumption was 45.6 MB. Max. memory is 7.1 GB. [2020-09-04 16:42:57,907 INFO L168 Benchmark]: TraceAbstraction took 9282.78 ms. Allocated memory was 206.0 MB in the beginning and 322.4 MB in the end (delta: 116.4 MB). Free memory was 123.7 MB in the beginning and 163.8 MB in the end (delta: -40.1 MB). Peak memory consumption was 76.3 MB. Max. memory is 7.1 GB. [2020-09-04 16:42:57,910 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 139.5 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 779.07 ms. Allocated memory was 139.5 MB in the beginning and 206.0 MB in the end (delta: 66.6 MB). Free memory was 102.6 MB in the beginning and 172.7 MB in the end (delta: -70.1 MB). Peak memory consumption was 26.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 73.12 ms. Allocated memory is still 206.0 MB. Free memory was 172.7 MB in the beginning and 170.0 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 702.66 ms. Allocated memory is still 206.0 MB. Free memory was 170.0 MB in the beginning and 124.4 MB in the end (delta: 45.6 MB). Peak memory consumption was 45.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9282.78 ms. Allocated memory was 206.0 MB in the beginning and 322.4 MB in the end (delta: 116.4 MB). Free memory was 123.7 MB in the beginning and 163.8 MB in the end (delta: -40.1 MB). Peak memory consumption was 76.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 602]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L592] int len = 2; [L593] len < 32 && __VERIFIER_nondet_int() [L593] len < 32 && __VERIFIER_nondet_int() [L593] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) [L596] CALL, EXPR sll_create(len + 1) [L564] SLL head = ((void *)0); [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); [L567] COND FALSE !(((void *)0) == new_head) [L570] new_head->next = head [L571] head = new_head [L572] len-- [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); [L567] COND FALSE !(((void *)0) == new_head) [L570] new_head->next = head [L571] head = new_head [L572] len-- [L565] COND TRUE len > 0 [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); [L567] COND FALSE !(((void *)0) == new_head) [L570] new_head->next = head [L571] head = new_head [L572] len-- [L565] COND FALSE !(len > 0) [L574] return head; [L596] RET, EXPR sll_create(len + 1) [L596] SLL s = sll_create(len + 1); [L597] CALL, EXPR sll_length(s) [L577] int len = 0; [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND TRUE \read(head) [L579] len++ [L580] EXPR head->next [L580] head = head->next [L578] COND FALSE !(\read(head)) [L582] return len; [L597] RET, EXPR sll_length(s) [L597] COND TRUE len != sll_length(s) [L602] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 86 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.1s, OverallIterations: 13, TraceHistogramMax: 3, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 704 SDtfs, 1522 SDslu, 1614 SDs, 0 SdLazy, 3556 SolverSat, 235 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 266 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=113occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 12 MinimizatonAttempts, 220 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...