The patch titled
Subject: kernel/exit.c: if init dies, log a signal which killed it, if any
has been added to the -mm tree. Its filename is
kernel-exitc-if-init-dies-log-a-signal-which-killed-it-if-any.patch
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------------------------------------------------------
From: Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>
Subject: kernel/exit.c: if init dies, log a signal which killed it, if any
I just received another user's pleas for help when their init mysteriously
died. I again explained that they need to check whether it died because
of bad instruction, a segv, or something else. Which was an annoying
detour into writing a trivial C program to spawn his init and print its
exit code:
http://lists.busybox.net/pipermail/busybox/2012-January/077172.html
I hear you saying "just test it under /bin/sh". Well, the crashing init
_was_ /bin/sh.
Which prompted me to make kernel do this first step automatically. We can
print exit code, which makes it possible to see that death was from e.g.
SIGILL without writing test programs.
Signed-off-by: Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>
Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/exit.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN kernel/exit.c~kernel-exitc-if-init-dies-log-a-signal-which-killed-it-if-any kernel/exit.c
--- a/kernel/exit.c~kernel-exitc-if-init-dies-log-a-signal-which-killed-it-if-any
+++ a/kernel/exit.c
@@ -710,8 +710,11 @@ static struct task_struct *find_new_reap
if (unlikely(pid_ns->child_reaper == father)) {
write_unlock_irq(&tasklist_lock);
- if (unlikely(pid_ns == &init_pid_ns))
- panic("Attempted to kill init!");
+ if (unlikely(pid_ns == &init_pid_ns)) {
+ panic("Attempted to kill init! exitcode=%08x\n",
+ father->signal->group_exit_code ?:
+ father->exit_code);
+ }
zap_pid_ns_processes(pid_ns);
write_lock_irq(&tasklist_lock);
_
Subject: Subject: kernel/exit.c: if init dies, log a signal which killed it, if any
Patches currently in -mm which might be from vda.linux@xxxxxxxxxxxxxx are
kernel-exitc-if-init-dies-log-a-signal-which-killed-it-if-any.patch
kernel-exitc-if-init-dies-log-a-signal-which-killed-it-if-any-fix.patch
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