From: Alexander Nyberg <alexn@dsv.su.se>
Prevent recursive faults in do_exit() by leaving the task alone and wait
for reboot. This may allow a more graceful shutdown and possibly save the
original oops.
Signed-off-by: Alexander Nyberg <alexn@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
kernel/exit.c | 11 +++++++++++
1 files changed, 11 insertions(+)
diff -puN kernel/exit.c~avoid-recursive-oopses kernel/exit.c
--- 25/kernel/exit.c~avoid-recursive-oopses 2005-05-06 18:03:45.000000000 -0700
+++ 25-akpm/kernel/exit.c 2005-05-06 18:06:01.000000000 -0700
@@ -795,6 +795,17 @@ fastcall NORET_TYPE void do_exit(long co
ptrace_notify((PTRACE_EVENT_EXIT << 8) | SIGTRAP);
}
+ /*
+ * We're taking recursive faults here in do_exit. Safest is to just
+ * leave this task alone and wait for reboot.
+ */
+ if (unlikely(tsk->flags & PF_EXITING)) {
+ printk(KERN_ALERT
+ "Fixing recursive fault but reboot is needed!\n");
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule();
+ }
+
tsk->flags |= PF_EXITING;
/*
_