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| author |   Don Zickus <dzickus@redhat.com> | 2015-11-05 18:44:44 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-05 19:34:48 -0800 |
| commit | ac1f591249d95372f3a5ab3828d4af5dfbf5efd3 (patch) | |
| tree | 39dfce1a0fc12de79689cd97e2876ddf777c8cab /Documentation/lockup-watchdogs.txt | |
| parent | kernel/watchdog.c: perform all-CPU backtrace in case of hard lockup (diff) | |
| download | linux-dev-ac1f591249d95372f3a5ab3828d4af5dfbf5efd3.tar.xz linux-dev-ac1f591249d95372f3a5ab3828d4af5dfbf5efd3.zip | |
kernel/watchdog.c: add sysctl knob hardlockup_panic
The only way to enable a hardlockup to panic the machine is to set
'nmi_watchdog=panic' on the kernel command line.
This makes it awkward for end users and folks who want to run automate
tests (like myself).
Mimic the softlockup_panic knob and create a /proc/sys/kernel/hardlockup_panic
knob.
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/lockup-watchdogs.txt')
| -rw-r--r-- | Documentation/lockup-watchdogs.txt | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/lockup-watchdogs.txt b/Documentation/lockup-watchdogs.txt index 22dd6af2e4bd..4a6e33e1af61 100644 --- a/Documentation/lockup-watchdogs.txt +++ b/Documentation/lockup-watchdogs.txt @@ -20,8 +20,9 @@ kernel mode for more than 10 seconds (see "Implementation" below for details), without letting other interrupts have a chance to run. Similarly to the softlockup case, the current stack trace is displayed upon detection and the system will stay locked up unless the default -behavior is changed, which can be done through a compile time knob, -"BOOTPARAM_HARDLOCKUP_PANIC", and a kernel parameter, "nmi_watchdog" +behavior is changed, which can be done through a sysctl, +'hardlockup_panic', a compile time knob, "BOOTPARAM_HARDLOCKUP_PANIC", +and a kernel parameter, "nmi_watchdog" (see "Documentation/kernel-parameters.txt" for details). The panic option can be used in combination with panic_timeout (this |