[Linux-ha-dev] Filesystem not umounted because fuser does not see unix domain sockets

[Lars Ellenberg]

Hi there,
just to make you all aware of it.
sometimes "Filesystem stop" cannot umount the file system,
and fuser does not kill anybody.
and this time it it not NFS, for a change.

fuser misses unix domain sockets!

this is a long known issue, but it just recently hit me again
during a failover, so I thought we should work around this.

as one quasi ubiquitious program that uses unix domain sockets is
ssh-agent, let me ge you an example using it ...


# lvcreate -n scratch -L 1M vgX
# mke2fs /dev/vgX/scratch
# mkdir /scratch
# mount /dev/vgX/scratch /scratch
# ssh-agent -a /scratch/some-name
# fuser -v -m /scratch
# [ no output ]
# fuser -v /scratch/some-name
# [ the ssh-agent is listed, now! ]
# lsof /scratch
# [ no output ]
# lsof -U | grep /scratch
# ssh-agent 26782     root    3u  unix 0xffff880055f45440      242170 /scratch/some-name

so we may want to complement the "$FUSER -a -k -v -m" with
something like
 lsof -U | awk '/ \/'"$mountpoint"'\// { print $2 }' | xargs -- kill


comments?


-- 
: Lars Ellenberg                            Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
: Vivenotgasse 48, A-1120 Vienna/Europe    http://www.linbit.com :