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Re: guix-daemon might be unmounting filesystems


From: Myles English
Subject: Re: guix-daemon might be unmounting filesystems
Date: Wed, 15 Feb 2017 21:49:34 +0000
User-agent: mu4e 0.9.18; emacs 25.1.1


on [2017-02-14] at 16:45 Leo Famulari writes:

> On Tue, Feb 14, 2017 at 10:49:54AM +0000, Myles English wrote:
>>
>> About one time out of ten when I use a guix command my filesystems,
>> including /home, become unmounted and I have to manually remount them.
>>
>> I am not sure this is because of guix-daemon or systemd or even my zsh
>> config but in the logs I get something like this:
>>
>> Feb 14 09:57:39 bill guix-daemon[11909]: accepted connection from pid 4342, 
>> user myles
>> Feb 14 09:57:39 bill guix-daemon[11909]: spurious SIGPOLL
>> Feb 14 09:57:40 bill guix-daemon[11909]: spurious SIGPOLL
>> [...about 18 SIGPOLLs per second...]
>> Feb 14 09:58:22 bill guix-daemon[11909]: spurious SIGPOLL
>> Feb 14 09:58:22 bill guix-daemon[11909]: spurious SIGPOLL
>> Feb 14 09:58:40 bill systemd[1]: gnu.automount: Got automount request for 
>> /gnu, triggered by 4345 (guix-daemon)
>> Feb 14 09:58:40 bill systemd[1]: Mounting /gnu...
>> Feb 14 09:58:41 bill systemd[1]: Mounted /gnu.
>> Feb 14 09:58:41 bill systemd[1]: home.automount: Got automount request for 
>> /home, triggered by 835 (systemd)
>
> That's strange!
>
> I'm using Guix on Debian Sid (systemd 232), and my user's default shell
> is Zsh. I haven't experienced this problem.

Thanks for your data!  I am using the same version of systemd.  I only
suspected zsh because my shell prompt would often look strange but with
hindsight it was because my /home had been dropped.

> With a frequency of one out of ten, it should be only mildly annoying to
> reproduce while strace-ing the guix-daemon to see if it's involved.

I tried strace and there is nothing obvious that say guix is involved in
the unmounting, other than a lot of disk IO.  Based on internet search
results, and the fact that it has been happening more frequently, I am
beginning to suspect my hard drive plus or minus btrfs (not wanting to
cast aspersions because btrfs has otherwise been very well behaved).

Myles



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