Bug#788050: systemd-fsck : Check disks at each reboot

Michael Biebl email at michaelbiebl.de
Sat Sep 10 16:31:42 BST 2016

Am 10.09.2016 um 15:16 schrieb Michael Biebl:
> On Wed, 7 Sep 2016 18:31:12 +0200 Michal Schmidt <mschmidt at redhat.com>
> wrote:
>> systemd-fsckd's event loop terminates if nothing happens for 30 seconds
>> (IDLE_TIME_SECONDS). Usually fsck writes progress updates more frequently
>> than that, but the interval is not guaranteed. So systemd-fsckd may exit
>> by itself while fsck is busy working. When this happens, fsck will
>> receive SIGPIPE as soon as it tries to write the next progress update.
>> It is possible to reproduce this using the dm-delay DM target for
>> a block device.
>> The bug is specific to Debian/Ubuntu, because systemd-fsckd is not
>> present in upstream.
> So, with Michal's hint I've setup a really slow dm-delayed device. Then
> I ran a systemd-fsck@ check on that device.
> systemd-fsckd does indeed exit before the fsck process has finished,
> *but* I don't get a failing fsck because of that.
> So I wonder if there were some changes in either util-linux or e2fsprogs
> which handle SIGPIPE differently now in fsck.
> Maybe tytso has some insight here.
> For anyone who was able to reproduce the issue, which versions of
> util-linux and e2fsprogs do you have installed which show this problem?
> Can you still reproduce it on an up-to-date stretch system?

Nvm, I was actually to reproduce the problem and have a patch ready.
Anyone want to give it a try?

Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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