Public bug reported:
We observe spontaneous and not (yet) reproducible freezes on many of our
heterogeneous PCs. A machine freezes such that it cannot be accessed
locally anymore (keyboard dead, screen black or with last image,
sometimes mouse can be moved but no action on clicks) but we have full
access via ssh. There are no heavy processes or such running. Freeze
happens sometime during usage but also during screen-lock without
background activity.
We have observed the problem
* on Ubuntu 12.04 and 14.04,
* on PCs running a multitude of graphics adapters (nvidia, ati, intel)
* on PCs running different versions of e.g. the nvidia driver
The only log file with some information related to this is
/var/log/Xorg.0.log where we find
==>>===================================================================
(EE) [mi] EQ overflowing. Additional events will be discarded until existing
events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7f1bd1327848]
(EE) 1: /usr/bin/X (mieqEnqueue+0x22b) [0x7f1bd130983b]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x52) [0x7f1bd11eaf72]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f1bc8621000+0x57fd)
[0x7f1bc86267fd]
(EE) 4: /usr/bin/X (0x7f1bd117e000+0x93518) [0x7f1bd1211518]
(EE) 5: /usr/bin/X (0x7f1bd117e000+0xbbc90) [0x7f1bd1239c90]
(EE) 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f1bd027a000+0x10340)
[0x7f1bd028a340]
(EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (__poll+0x10) [0x7f1bced86110]
(EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (0x7f1bcec99000+0x1284a0)
[0x7f1bcedc14a0]
(EE) 9: /lib/x86_64-linux-gnu/libnsl.so.1 (0x7f1bc7ff7000+0x515f)
[0x7f1bc7ffc15f]
(EE) 10: /lib/x86_64-linux-gnu/libnsl.so.1 (yp_match+0xb2) [0x7f1bc7ffc6a2]
(EE) 11: /lib/x86_64-linux-gnu/libnss_nis.so.2 (_nss_nis_getpwnam_r+0x68)
[0x7f1bc7df0a98]
(EE) 12: /lib/x86_64-linux-gnu/libnss_compat.so.2 (0x7f1bc8211000+0x156c)
[0x7f1bc821256c]
(EE) 13: /lib/x86_64-linux-gnu/libnss_compat.so.2 (_nss_compat_getpwnam_r+0x3f7)
[0x7f1bc8215617]
(EE) 14: /lib/x86_64-linux-gnu/libc.so.6 (getpwnam_r+0xdd) [0x7f1bced5906d]
(EE) 15: /lib/x86_64-linux-gnu/libc.so.6 (getpwnam+0x7f) [0x7f1bced589ff]
(EE) 16: /usr/bin/X (0x7f1bd117e000+0x1a7ae5) [0x7f1bd1325ae5]
(EE) 17: /usr/bin/X (0x7f1bd117e000+0x1a8ac7) [0x7f1bd1326ac7]
(EE) 18: /usr/bin/X (InvalidHost+0x170) [0x7f1bd1327180]
(EE) 19: /usr/bin/X (ClientAuthorized+0x125) [0x7f1bd1328905]
(EE) 20: /usr/bin/X (0x7f1bd117e000+0x559ac) [0x7f1bd11d39ac]
(EE) 21: /usr/bin/X (0x7f1bd117e000+0x55f0e) [0x7f1bd11d3f0e]
(EE) 22: /usr/bin/X (0x7f1bd117e000+0x59d9a) [0x7f1bd11d7d9a]
(EE) 23: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5)
[0x7f1bcecbaec5]
(EE) 24: /usr/bin/X (0x7f1bd117e000+0x451ee) [0x7f1bd11c31ee]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the
stack.
(EE) [mi] mieq is *NOT* the cause. It is a victim.
(EE) [mi] EQ overflow continuing. 100 events have been dropped.
==>>===================================================================
That then counts in steps of 100 up to 1000 and then the machine is frozen
locally. Different to other bug reports on similar issues, it appears here that
libnss_nis.so.2 and libnss_compat.so.2 are involved (user login is via yp).
Any workaround would be appreciated. I'm happy to provide more details
if required.
** Affects: nvidia-graphics-drivers-331-updates (Ubuntu)
Importance: Undecided
Status: New
** Tags: freeze graphics lightning xorg
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1536605
Title:
Machine freezes locally, Xorg EQ overflow
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-331-updates/+bug/1536605/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
