Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ulatencyd (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1091986
Title:
** Attachment added: Photo of the screen for an example crash (1)
https://bugs.launchpad.net/ubuntu/+source/ulatencyd/+bug/1091986/+attachment/3463666/+files/IMG_20121219_092424.jpg
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** Attachment added: Photo of the screen for an example crash (2)
https://bugs.launchpad.net/ubuntu/+source/ulatencyd/+bug/1091986/+attachment/3463668/+files/IMG_20121219_093915.jpg
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Additional info: I was able to boot into recovery mode and diagnose
the system from there. However, trying to run normal boot resulted in
kernel crash every time (I booted about 30 times while trying to fix the
system). The crash occured usually before the purple Ubuntu boot
screen was visible but
Additional info: once the system is running, I can remove the exit 1
from /etc/init.d/ulatencyd and then start ulatencyd process so this
seems to be some kind of race condition in the kernel. Some crashes have
kernel watchdog messages saying Watchdog detected hard LOCKUP on cpu 1
(sometimes the
The kernels I was able to reproduce the problem with:
linux-image-3.2.0-29-generic:
Installed: 3.2.0-29.46
Candidate: 3.2.0-29.46
Version table:
*** 3.2.0-29.46 0
500 http://fi.archive.ubuntu.com/ubuntu/ precise-updates/main amd64
Packages
500
Does ulatencyd collect any data from the system that is used for
deciding grouping and scheduling changes? I see only static choices in
/etc/ulatencyd/simple.d and /etc/ulatencyd/rules but perhaps I'm missing
something...
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Possibly duplicate of Bug #1034099 ?
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https://bugs.launchpad.net/bugs/1091986
Title:
ulatencyd causes random kernel crashes during boot
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