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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2014-06-06 14:37:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-06 16:08:12 -0700
commitf06e5153f4ae2e2f3b0300f0e260e40cb7fefd45 (patch)
tree0f47c2a93b1f1a3fab27ee48aa34509e13592256
parenta219ccf4637396a2392bfbec7c12acbfe2b06b46 (diff)
downloadop-kernel-dev-f06e5153f4ae2e2f3b0300f0e260e40cb7fefd45.zip
op-kernel-dev-f06e5153f4ae2e2f3b0300f0e260e40cb7fefd45.tar.gz
kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers
Add a "crash_kexec_post_notifiers" boot option to run kdump after running panic_notifiers and dump kmsg. This can help rare situations where kdump fails because of unstable crashed kernel or hardware failure (memory corruption on critical data/code), or the 2nd kernel is already broken by the 1st kernel (it's a broken behavior, but who can guarantee that the "crashed" kernel works correctly?). Usage: add "crash_kexec_post_notifiers" to kernel boot option. Note that this actually increases risks of the failure of kdump. This option should be set only if you worry about the rare case of kdump failure rather than increasing the chance of success. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Acked-by: Motohiro Kosaki <Motohiro.Kosaki@us.fujitsu.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com> Cc: Satoru MORIYA <satoru.moriya.br@hitachi.com> Cc: Tomoki Sekiyama <tomoki.sekiyama@hds.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/kernel-parameters.txt8
-rw-r--r--kernel/panic.c23
2 files changed, 29 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9973a7e..b9f6778 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2361,6 +2361,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
timeout < 0: reboot immediately
Format: <timeout>
+ crash_kexec_post_notifiers
+ Run kdump after running panic-notifiers and dumping
+ kmsg. This only for the users who doubt kdump always
+ succeeds in any situation.
+ Note that this also increases risks of kdump failure,
+ because some panic notifiers can make the crashed
+ kernel more unstable.
+
parkbd.port= [HW] Parallel port number the keyboard adapter is
connected to, default is 0.
Format: <parport#>
diff --git a/kernel/panic.c b/kernel/panic.c
index d02fa9f..62e16ce 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -32,6 +32,7 @@ static unsigned long tainted_mask;
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_timeout = CONFIG_PANIC_TIMEOUT;
EXPORT_SYMBOL_GPL(panic_timeout);
@@ -112,9 +113,11 @@ void panic(const char *fmt, ...)
/*
* If we have crashed and we have a crash kernel loaded let it handle
* everything else.
- * Do we want to call this before we try to display a message?
+ * If we want to run this after calling panic_notifiers, pass
+ * the "crash_kexec_post_notifiers" option to the kernel.
*/
- crash_kexec(NULL);
+ if (!crash_kexec_post_notifiers)
+ crash_kexec(NULL);
/*
* Note smp_send_stop is the usual smp shutdown function, which
@@ -131,6 +134,15 @@ void panic(const char *fmt, ...)
kmsg_dump(KMSG_DUMP_PANIC);
+ /*
+ * If you doubt kdump always works fine in any situation,
+ * "crash_kexec_post_notifiers" offers you a chance to run
+ * panic_notifiers and dumping kmsg before kdump.
+ * Note: since some panic_notifiers can make crashed kernel
+ * more unstable, it can increase risks of the kdump failure too.
+ */
+ crash_kexec(NULL);
+
bust_spinlocks(0);
if (!panic_blink)
@@ -472,6 +484,13 @@ EXPORT_SYMBOL(__stack_chk_fail);
core_param(panic, panic_timeout, int, 0644);
core_param(pause_on_oops, pause_on_oops, int, 0644);
+static int __init setup_crash_kexec_post_notifiers(char *s)
+{
+ crash_kexec_post_notifiers = true;
+ return 0;
+}
+early_param("crash_kexec_post_notifiers", setup_crash_kexec_post_notifiers);
+
static int __init oops_setup(char *s)
{
if (!s)
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