[pacman-dev] Strange (critical) bug with checkspace

[Nagy Gabor]

Hi!

I've run into the following bug:
$ df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs           44G   30G   13G  71% /
/dev            501M     0  501M   0% /dev
/run            503M  276K  503M   1% /run
/dev/sda3        44G   30G   13G  71% /
none            503M     0  503M   0% /dev/shm
/dev/sda1        30G   29G  1.6G  95% /c
/dev/sr0        4.2G  4.2G     0 100% /e

[Don't laugh at my mountpoints.]

$ sudo pacman -Su
...
Total Installed Size:   900.93 MiB
Net Upgrade Size:       139.47 MiB
...
error: Partition /e is mounted read only
error: not enough free disk space
error: failed to commit transaction (not enough free disk space)
Errors occurred, no packages were upgraded.

What?! I think none of our packages wants to write to /e/... I've tried
with both pacman 4.0.2-1 and pacman-git, the result is the same. I've
also tried with "pacman -S randompkg", that worked fine. I don't want
to umount /e, because I am afraid of the fact that I might not be able
to reproduce this bug any more...

The relevant part of --debug log says nothing:
[04:19:41] debug: checking available disk space
[04:19:41] debug: mountpoint: /sys
[04:19:41] debug: mountpoint: /run
[04:19:41] debug: mountpoint: /root/.gvfs
[04:19:41] debug: mountpoint: /proc
[04:19:41] debug: mountpoint: /e
[04:19:41] debug: mountpoint: /dev/shm
[04:19:41] debug: mountpoint: /dev/pts
[04:19:41] debug: mountpoint: /dev
[04:19:41] debug: mountpoint: /c
[04:19:41] debug: mountpoint: /
[04:19:41] debug: mountpoint: /
[04:19:41] error: Partition /e is mounted read only
[04:19:41] debug: partition /, needed 3897, cushion 5121, free 3727796
[04:19:41] debug: returning error 7 from _alpm_check_diskspace : not enough free disk space
[04:19:41] error: not enough free disk space
[04:19:41] error: failed to commit transaction (not enough free disk space)
[04:19:41] debug: unregistering database 'local'

NG