This bug was fixed in the package linux - 4.8.0-38.41
---
linux (4.8.0-38.41) yakkety; urgency=low
[ Thadeu Lima de Souza Cascardo ]
* Release Tracking Bug
- LP: #1661232
* Backport Dirty COW patch to prevent wineserver freeze (LP: #1658270)
- SAUCE: mm: Respect
This bug was fixed in the package linux - 4.4.0-63.84
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linux (4.4.0-63.84) xenial; urgency=low
[ Thadeu Lima de Souza Cascardo ]
* Release Tracking Bug
- LP: #1660704
* Backport Dirty COW patch to prevent wineserver freeze (LP: #1658270)
- SAUCE: mm: Respect
Tested with Yakkety 4.8.0-38-generic #41-Ubuntu, no failures
** Tags removed: verification-needed-yakkety
** Tags added: verification-done-yakkety
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Tested with Xenial 4.4.0-63-generic #84-Ubuntu, no failures.
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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https://bugs.launchpad.net/bugs/1652132
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
yakkety' to 'verification-done-yakkety'. If the problem still exists,
change the tag
FWIW, I have run this on a Xeon Phi system and not reproduced the
failure using stress-ng 0.07.16 (built in our PPA for Xenial).
This appears to have an AMI fake keyboard and mouse as the Power system that
fails does.
Bus 003 Device 003: ID 046b:ff10 American Megatrends, Inc. Virtual Keyboard
Note, the above comment was validated on a Fujitsu CX1640 Xeon Phi system with
Xenial and the stock ubuntu kernel:
Linux cx1640-1 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
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** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
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** Description changed:
+ == SRU REQUEST [Xenial, Yakkety, Zesty] ==
+
Ubuntu 16.04.1
Kernel = 4.4.0-53-generic-74-Ubuntu ppc64le
When running the stress-ng "fstat" stressor, it is trying to access the
USB bus and giving a call trace and locking up any further USB activity
(lsusb
Going to quirk this with polling to avoid the issue with the urb kill.
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
Checked this right through 4.0 to 4.10-rc5, it can be triggered with any
of these kernels with enough run time.
** Bug watch added: Linux Kernel Bug Tracker #193301
http://bugzilla.kernel.org/show_bug.cgi?id=193301
** Also affects: linux via
OK, so this is annoying race condition, so bisecting it has been causing
me some pain today. It turns out that 4.10-rc4 seems OK, whereas
4.10-rc3 and before will hang after two or 3 iterations of my stress
test.
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4.9 fails, 4.10-rc1 OK, bisecting on that
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
keyboard and mouse present
Can't break the kernel with 4.10-rc4
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
keyboard and mouse present
To
Fails on mainline 4.9 too.
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
keyboard and mouse present
To manage
Hang seems to occur when on a race when fstat'ing /dev/psaux
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
keyboard
OK, I've got access to the machine and can easily reproduce this. This
is not a stress-ng bug per-se, it's a locking issue so I'll remove
stress-ng from the bug.
** No longer affects: stress-ng
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
This test has been run dozens of times across multiple machines and
deployments and reboots. It is completely reproducible.
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Title:
Call trace
It looks to me that a reset on a USB device from an atomic context
occurred, causing __usb_queue_reset_device to be executed from a worker
thread but this got hung for some reason. The fstat stressor was being
run at the time, and that also locks up. So my current hunch is that
this may have been
FYI, Added stress-ng task as a specific test case in that tool is
exposing this issue. Just want to be sure this is not a test tool issue
instead of a legit kernel issue.
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** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: stress-ng
Assignee: (unassigned) => Colin Ian King (colin-king)
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** Also affects: stress-ng
Importance: Undecided
Status: New
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Title:
Call trace when testing fstat stressor on ppc64el with virtual
** Summary changed:
- Call trace when testing fstat stressor on ppc64el with virtual keyboard and
mouse
+ Call trace when testing fstat stressor on ppc64el with virtual keyboard and
mouse present
** Tags added: blocks-hwcert-server
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