El 02/10/13 05:19, Chris Wilson escribió:
On Tue, Oct 01, 2013 at 06:15:00PM -0500, Alex Villacís Lasso wrote:
I have seen this graphics freeze under stock 3.10.x from the Fedora
18 x86_64 distro, and also with vanilla compiled 3.11 and 3.12-rc3.
After a few hours of working, the screen stops updating. The mouse
pointer moves around and changes if moved over different parts of
the screen, but the display itself does not change anymore. If I
check /sys/kernel/debug/dri/0/i915_error_state right then (via a
remote ssh), there is no error captured. However, if I do "echo 1 >
/sys/kernel/debug/dri/0/i915_wedged", after a few moments an error
is captured, as well as messages in the kernel log, both of which
are attached. If I try to restart the gnome-shell session, I get the
KMS console, and then the start of the graphic login, but then the
graphic login itself freezes again.
Is the attached information enough to diagnose the issue?
Afaict it was a userspace hang, the GPU was rightfully idle. Only on the
reset did it actually die.
If I do "echo 1 > /sys/kernel/debug/dri/0/i915_wedged" when the display is not
frozen, I only get the following in dmesg, and the system keeps working normally:
[ 323.441616] [drm] Manually setting wedged to 1
[ 323.441622] [drm] capturing error event; look for more information in
/sys/class/drm/card0/error
[ 348.955655] [drm] Manually setting wedged to 0
Is it to be expected that an "userspace hang" will escalate into a failed reset
when setting i915_wedged to 1, without anything being actually wrong at the kernel side,
at least at first?
I'd suggest looking at the stacktraces of the usual suspects and see who
is waiting upon whom, or if there is a more obvious lockup. Then begin
the painful process of tracing the interoperation of those two processes
to try and catch the breakdown.
-Chris
I think Xorg is one of the "usual suspects". Should gnome-shell be one too?
This is a Fedora 18 desktop with gnome-shell as installed from the DVD.
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