tree ba550d1d94a11b8f758f905e40c3d2aa7494007d
parent 4c738480d21a190e3d99c7ce985ab9484f373a3c
author Andrew Morton <akpm@linux-foundation.org> 1180903841 -0700
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1180988710 -0700

vanishing ioctl handler debugging

We've had several reoprts of the CPU jumping to 0x00000000 is do_ioctl().  I
assume that there's a race and someone is zeroing out the ioctl handler while
this CPU waits for the lock_kernel().

The patch adds code to detect this, then emits stuff which will hopefuly lead
us to the culprit.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>