** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
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Title:
UIO: mutex used in interrupt handler causes crash
This bug was fixed in the package linux - 4.15.0-72.81
---
linux (4.15.0-72.81) bionic; urgency=medium
* bionic/linux: 4.15.0-72.81 -proposed tracker (LP: #1854027)
* [Regression] Bionic kernel 4.15.0-71.80 can not boot on ThunderX
(LP: #1853326)
- Revert "arm64: Use
Verified fix in proposed 4.15.0-71-generic.
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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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-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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Title:
UIO: mutex used in interrupt handler
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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Title:
UIO: mutex used in interrupt handler causes crash
@Tom Sounds like a winner to me! I've submitted the patch to our process
pipeline:
https://lists.ubuntu.com/archives/kernel-team/2019-October/105155.html
A post will appear here once it lands in a production Bionic kernel
(most likely in our next three-week cycle, around 18-Nov).
Thanks again
@Kamal yes this seems to fix it. I was able to run my device stress
test for over 15 minutes. With the bug I was lucky if I could make it
15 seconds.
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@Tom- Ah yes, you'll need the headers packages too, in order to build
your own modules. OK, I've now added the two "linux-headers-*" packages
to https://kernel.ubuntu.com/~kamal/lp1843487/ ... I believe you'll have
to install the pair together.
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@Kamal thanks for the quick response. I tried the files you sent over
but it looks like I need some additional packages in order to rebuild my
kernel module for that kernel. I tried to tell modprobe to force load
my module built against 4.15.0-66 and it would not load it.
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@Tom- Thanks for reporting this and isolating the cause and the fix.
Here's a test kernel which includes a backport of the fix commit. Could
you please verify that it resolves the problem?:
https://kernel.ubuntu.com/~kamal/lp1843487/
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** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)
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** Description changed:
Running:
Bionic Beaver
Ubuntu 4.15.0-62.69-generic 4.15.18
In commit 725bbc87 on 2/13/2019 in uio.c a mutex_lock was added to
uio_interrupt. This results in a "scheduling while atomic" error if
someone else owns the mutex at the time it is invoked.
- [
The following commit in the kernel mainline fixes this issue:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3d27c4de8d4fb2d4099ff324671792aa2578c6f9
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apport information
** Tags added: apport-collected
** Description changed:
Running:
Bionic Beaver
Ubuntu 4.15.0-62.69-generic 4.15.18
In commit 725bbc87 on 2/13/2019 in uio.c a mutex_lock was added to
uio_interrupt. This results in a "scheduling while atomic" error if
someone
** Tags added: bionic
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Title:
UIO: mutex used in interrupt handler causes crash
Status in linux package in Ubuntu:
Incomplete
** Description changed:
+ Running:
+ Bionic Beaver
Ubuntu 4.15.0-62.69-generic 4.15.18
In commit 725bbc87 on 2/13/2019 in uio.c a mutex_lock was added to
uio_interrupt. This results in a "scheduling while atomic" error if
someone else owns the mutex at the time it is invoked.
[
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