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authorDenys Vlasenko <vda.linux@googlemail.com>2012-03-23 15:01:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:32 -0700
commit397a21f24d455982a8a6f9bc11b5f3326ce3c6ef (patch)
treeba92e73491599341db615f719df97cea6fdfaf6b /kernel
parentebec18a6d3aa1e7d84aab16225e87fd25170ec2b (diff)
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. [akpm@linux-foundation.org: add 0x to hex number output] Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 456329fd4ea..3db1909faed 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -711,8 +711,11 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
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=0x%08x\n",
+ father->signal->group_exit_code ?:
+ father->exit_code);
+ }
zap_pid_ns_processes(pid_ns);
write_lock_irq(&tasklist_lock);