diff options
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index d09dc5c32c67..4d8d6f906dec 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -33,6 +33,7 @@ static int pause_on_oops; static int pause_on_oops_flag; static DEFINE_SPINLOCK(pause_on_oops_lock); static bool crash_kexec_post_notifiers; +int panic_on_warn __read_mostly; int panic_timeout = CONFIG_PANIC_TIMEOUT; EXPORT_SYMBOL_GPL(panic_timeout); @@ -244,6 +245,7 @@ static const struct tnt tnts[] = { * 'I' - Working around severe firmware bug. * 'O' - Out-of-tree module has been loaded. * 'E' - Unsigned module has been loaded. + * 'L' - A soft lockup has previously occurred. * * The string is overwritten by the next call to print_tainted(). */ @@ -427,6 +429,17 @@ static void warn_slowpath_common(const char *file, int line, void *caller, if (args) vprintk(args->fmt, args->args); + if (panic_on_warn) { + /* + * This thread may hit another WARN() in the panic path. + * Resetting this prevents additional WARN() from panicking the + * system on this thread. Other threads are blocked by the + * panic_mutex in panic(). + */ + panic_on_warn = 0; + panic("panic_on_warn set ...\n"); + } + print_modules(); dump_stack(); print_oops_end_marker(); @@ -484,6 +497,7 @@ EXPORT_SYMBOL(__stack_chk_fail); core_param(panic, panic_timeout, int, 0644); core_param(pause_on_oops, pause_on_oops, int, 0644); +core_param(panic_on_warn, panic_on_warn, int, 0644); static int __init setup_crash_kexec_post_notifiers(char *s) { |