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Bug#735927: general: xserver-xorg-video-intel crashes when shared dynamic video ram runs out

Thanks for your reply Andreas.

> What else do you expect after putting the system under
> extreme memory pressure

I expect, intel driver bug-or-not ASIDE, the linux to kill the chrome
and keep the X. tmpfs is another story, because there's nothing huge to
kill except X. But again i expect the kernel to kill chrome first, X

> PS: and you would be perfectly fine if X wouldn't crash but would be
> killed by the oomkiller - with the same situation afterwards ?

Now that you're asking it, yes! because that i could fix with
Martijn's idea by setting chrome's oom_score_adj to a low value which
would kill chrome first and enough memory would free up to keep the X.

> Compare the versions of xserver-xorg-core and xserver-xorg-video-intel
> between the Ubuntu version and the Debian version you used.

Yes sir, xserver-xorg-video-intel debian: 2:2.19.0-6 ubuntu: 2:2.14.0-4

> Could you try the vesa (xserver-xorg-video-vesa) driver instead and
> see what happens under extreme memory pressure?

Excellent idea, dont know why i havent done this already. That's why i
turned to you for help. btw this is my first time on debianbts, so i'm
sorry if i do something out of etiquette - my bad english does not help

I uninstalled xserver-xorg-video-intel as i'm dumb and dont
know how to disable a driver (tried blacklist but dont know the module
name, googled, nothing, so), i rebooted, tried to crash the system,
opened 7 youtube videos, chrome got killed, X survived. Just like on my
other systems and OSes.
So it seems proven that the intel driver is the problem. Maybe because
vesa driver doesnt use dynamic video memory only a fixed size small one?

> The ret value is not returned to the
> caller (X), so that does not know about the failure.

Any chance to fix this?

> I don't think its running out of *video memory*. It's just running out
> of normal RAM.


> To me this looks like the intel driver cannot do a task because it
> cannot allocate memory

So it cannot allocate shared "video memory" ;)

> this does not neccessarily trigger the kernel's OOM killer

Yes, because that's "video memory", not system memory.

The problem is exactly what you wrote: the oom-killer cannot step in to
free memory before the intel driver crashes.

Can i somehow allocate the video memory from the system memory

> And since I suspect xserver-xorg-video-intel, you might want try a
> newer version of that driver.


# echo 'APT::Default-release "stable";' > /etc/apt/apt.conf.d/00default
# echo -e 'Package: *\nPin: release a=stable\nPin-Priority:
700\n\nPackage: *\nPin: release a=testing\nPin-Priority:
650\n\nPackage: *\nPin: release a=unstable\nPin-Priority: 600\n' > /etc/apt/preferences.d/pinning
# echo -e '\ndeb http://ftp.debian.org/debian/ jessie main contrib
non-free\ndeb-src http://ftp.debian.org/debian/ jessie main contrib
non-free\n' >> /etc/apt/sources.list # apt-get update
# apt-get install xserver-xorg-video-intel/jessie

but apt-pinning did not work, since it requires update of libc.
So, i did:

# apt-get install dpkg-dev
# apt-get build-dep xserver-xorg-video-intel/jessie
# apt-get -b source xserver-xorg-video-intel/jessie
# dpkg -i xserver-xorg-video-intel_2.21.15-1_amd64.deb

Guys, did i do this right? This building thing?

I rebooted and ran the test, it did not crash. As i started to rejoice,
i realized, i'm probably using the vesa driver, so still not knowing
how to specify or even list the driver to use, i removed the
xserver-xorg-video-vesa package and rebooted. It crashed just like with
the old driver.

You see my problem is in this current state the system is broken: it is
wrong my grandma opens 10 browser tabs and the next thing she sees is
the lightdm login screen - she doesnt know her password, she doesnt
even know she HAS a username! (autologin)
It would be totally fine if there would be only 1024-128=896
MB free ram to the system, hell i wouldnt even care if there would be
256 MB and she could just open 1 browser tab, but her aisleriot
solitaire and mahjongg games should stay intact. Very important.

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