On Thu, Mar 13, 2014 at 09:40:02AM +0100, Pavel Machek wrote:
On Wed 2014-03-12 23:52:09, Chris Wilson wrote:
On Thu, Mar 13, 2014 at 12:30:39AM +0100, Pavel Machek wrote:
Hi!
This cost me two half-written mails...
So far it happened once, so it may be very infrequent; but I do not think I seen similar failure from i915 before, so it may be an regression. Well...
It's a userspace use-after-free bug. Please file a bug on bugs.freedesktop.org.
Could we get some better messages from the kernel? Userspace should not be able to produce WARN_ON()s.
Indeed, we have already pruned those errors and WARNs, in favour of a real error code, precisely because they are user triggerable.
(This is debian 6.0.8; do you think it is worth reporting? I don't think I should go to bugs.freedesktop.org...)
I guess your userspace is roughly xf86-video-intel-2.17 and friends. Quite a few changes since then, but I've forgotten if this bug was ever addressed explicitly. Most likely it has been... -Chris