Diagnosing "In procedure symlink: No space left on device"

[David Wilson]

Hello Guix!

Recently on one of my machines I've not been able to update one of my profiles 
due to a "No space left on device" error (see snippet below).  My device is 
most definitely not out of space (/dev/dm-0 has 42gb free):

---
λ df -h
Filesystem      Size  Used Avail Use% Mounted on
none            7.8G     0  7.8G   0% /dev
/dev/dm-0       234G  180G   42G  82% /
/dev/nvme0n1p2  495M   43M  453M   9% /boot/efi
tmpfs           7.8G     0  7.8G   0% /dev/shm
none            7.8G   28K  7.8G   1% /run/systemd
none            7.8G     0  7.8G   0% /run/user
cgroup          7.8G     0  7.8G   0% /sys/fs/cgroup
tmpfs           1.6G  4.0K  1.6G   1% /run/user/1000
---

Here's the backtrace from `guix package -m <my manifest file>`

---
Backtrace:
 8 (primitive-load "/gnu/store/mablf146gb6vb0m1lj9a9yr4cfj…")
In guix/build/profiles.scm:
 157:2 7 (build-profile "/gnu/store/mdzxrmx68qkpakhy1n5vk6lzvnq…" …)
In unknown file:
 6 (hash-for-each #<procedure 7ffff2e7cb80 at guix/build/…> …)
 5 (hash-for-each #<procedure 7ffff2852e40 at guix/build/…> …)
 4 (hash-for-each #<procedure 7ffff2852a40 at guix/build/…> …)
 3 (hash-for-each #<procedure 7ffff2889e00 at guix/build/…> …)
 2 (hash-for-each #<procedure 7ffff783e200 at guix/build/…> …)
 1 (hash-for-each #<procedure 7ffff2e068c0 at guix/build/…> …)
 0 (symlink "/gnu/store/z74railpdshvi28i1rfa97fp2d9rg79d-…" …)

ERROR: In procedure symlink:
In procedure symlink: No space left on device
---

Is there some other reason that Guix might think that I'm out of space?  Is 
there any other command I can run that might help illuminate why I'm getting 
this error?

Thanks!

David