The steps below are they in the chronological order?
gargamel:~# dmtail 3
[1887142.765448] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 1038, rd 4529, flush 0, corrupt 0, gen 0
[1887142.795820] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 1038, rd 4530, flush 0, corrupt 0, gen 0
[1887142.826176] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 1038, rd 4531, flush 0, corrupt 0, gen 0
gargamel:~# cat /proc/partitions |grep sd[ep]
8 240 3750738264 sdp
8 241 3750737223 sdp1
gargamel:~# mount | grep sde
/dev/sde1 on /mnt/btrfs_space type btrfs (ro,noatime,compress=lzo,ssd,discard,space_cache,skip_balance,subvolid=5,subvol=/)
/dev/sde1 on /var/local/space type btrfs (ro,noexec,noatime,compress=lzo,ssd,discard,space_cache,skip_balance,subvolid=257,subvol=/varlocalspace)
/dev/sde1 on /var/cache/zoneminder type btrfs (ro,nosuid,nodev,noatime,compress=lzo,ssd,discard,space_cache,skip_balance,subvolid=257,subvol=/varlocalspace/zoneminder)
/dev/sde1 on /var/lib/mysql type btrfs (ro,nosuid,nodev,noatime,compress=lzo,ssd,discard,space_cache,skip_balance,subvolid=3648,subvol=/mysql)
gargamel:~# umount /mnt/btrfs_space; umount /var/local/space; umount /var/cache/zoneminder; umount /var/lib/mysql
gargamel:~# mount | grep sde
gargamel:~# mount /dev/sdp1 /mnt/mnt
mount: /mnt/mnt: mount(2) system call failed: File exists.
gargamel:~# dmtail 2
[1887142.826176] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 1038, rd 4531, flush 0, corrupt 0, gen 0
[1887453.610947] BTRFS warning (device sde1): duplicate device fsid:devid for 727c7ba3-f6f9-462a-8472-453dd7d46d8a:1 old:/dev/sde1 new:/dev/sdp1
Before and after --forget command
btrfs fi show -m
could have told us what devices are still mounted.
I will send a boilerplate code to dump device list from the kernel it
will help to debug. As of now this boilderplate code which I have been
using is too localized needs a lot of cleanups, will take sometime.
gargamel:/usr/local/bin# btrfs device scan --forget
gargamel:/usr/local/bin# mount /dev/sdp1 /mnt/mnt
mount: /mnt/mnt: mount(2) system call failed: File exists.
Thanks, Anand
After reboot, I made sure sde is not used by anything weird, just simple mounts:
gargamel:~# lsblk | grep sde
sde 8:64 1 931.5G 0 disk
├─sde1 8:65 1 488.3M 0 part
├─sde2 8:66 1 14.9G 0 part
├─sde3 8:67 1 80G 0 part
└─sde4 8:68 1 836.1G 0 part
Any ideas?
Marc
