bug#39774: guix incorrectly says "No space left on device"

[Julien Lepiller]

Le 24 février 2020 22:01:45 GMT-05:00, Jesse Gibbons <address@hidden> a écrit :
>I have a laptop with two drives. A few days ago, when I ran `df -h` it
>outputs:
>Filesystem      Size  Used Avail Use% Mounted on
>none             16G     0   16G   0% /dev
>/dev/sdb1       229G  189G   29G  87% /
>/dev/sda1       458G  136G  299G  32% /gnu/store
>tmpfs            16G     0   16G   0% /dev/shm
>none             16G   64K   16G   1% /run/systemd
>none             16G     0   16G   0% /run/user
>cgroup           16G     0   16G   0% /sys/fs/cgroup
>tmpfs           3.2G   16K  3.2G   1% /run/user/983
>tmpfs           3.2G   60K  3.2G   1% /run/user/1001
>
>As you can see, /dev/sda1 is the drive mounted on /gnu/store.
>Everything in the store is written to it, and it has plenty of space
>available.
>
>Guix sometimes says there is "No space left on device". This always
>happens in particular when I try `guix gc --optimize`, but it sometimes
>happens when I call `guix pull` or `guix upgrade`. When guix pull or
>guix upgrade fails with this message, I can clear up more space by
>deleting ~/.cache and emtpying my trash and it works.
>
>
>Today I have also seen this happen when I'm trying to upgrade a large
>profile. It said it could not build anything because there was no more
>disk space, even after I cleaned up /dev/sdb1 to 40% use. It finally
>recognized the empty disk space when I called guix gc and it deleted a
>few of the dependencies needed for the upgrades. But it didn't take
>long to trigger this bug again. Here's the new output of `df -h`:
>
>Filesystem      Size  Used Avail Use% Mounted on
>none             16G     0   16G   0% /dev
>/dev/sdb1       229G   86G  131G  40% /
>/dev/sda1       458G  182G  253G  42% /gnu/store
>tmpfs            16G     0   16G   0% /dev/shm
>none             16G   80K   16G   1% /run/systemd
>none             16G     0   16G   0% /run/user
>cgroup           16G     0   16G   0% /sys/fs/cgroup
>tmpfs           3.2G   24K  3.2G   1% /run/user/983
>tmpfs           3.2G   12K  3.2G   1% /run/user/1000
>tmpfs           3.2G   60K  3.2G   1% /run/user/1001
>
>Any clues why this happens and what can be done to fix it? Could it be
>related to how /dev/sdb1 is 229G large, and the total used space in /
>and /gnu/store is more than that?
>
>-Jesse

There could be two explanations: you've run out of inodes or the filesystem 
that was out of space is not the one you think (maybe it was during a build and 
your /tmp is a tmpfs?). Try `df -i`.