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SubjectRe: [BUG] cgroup lockup while upgrading udev on debian
Hello, Steven.

On Sun, Jan 21, 2018 at 09:31:08PM -0500, Steven Rostedt wrote:
> While upgrading my system, it locked up while upgrading udev. It locked
> up on vanilla v4.14.12, and it also locked up on debian's 4.14 kernel
> as well. When I booted debian's 4.9 kernel, it upgraded fine.
> Note, this is my main server and not a development box. It is not
> something I'm going to run bisects or other tests on. I don't even have
> it logging to serial console (hence the photo). It's serials are hooked
> to my test boxes. That is, it receives logs, it's not set up to send
> them.
> Attached in the photo of the crash that happened when I did:
> # dpkg --configure udev

It looks like the same bug which was fixed by 74d0833c659a ("cgroup:
fix css_task_iter crash on CSS_TASK_ITER_PROC"). The bug got
introduced durinv v4.14 cycle and triggers when cgroup1 and cgroup2
are used at the same time, which the recent versions of systemd does
when in cgroup1 mode.



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