[PATCH] avoid resursive oopses

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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 2ef2ad540201..c2bdf6fb61a5 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -793,6 +793,17 @@ fastcall NORET_TYPE void do_exit(long code)
                 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;
 
         /*