[LU-19222] 'umount -f' of bind mount marks all imports inactive

• Type: Bug
• Resolution: Unresolved
• Priority: Critical
• Affects Version/s: Lustre 2.14.0, Lustre 2.17.0, Lustre 2.16.1
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

Unmounting a bind mount to a client filesystem with the "-f" (force) option causes the unmount process to mark all of the MDT and OST imports on the client as inactive, resulting in the other bind and regular mounts to become inoperative:

# mount -t lustre mookie-gig:/myth /myth
# mount --bind /myth /mnt/tmp
# umount -f /mnt/tmp
Lustre: setting import myth-MDT0000_UUID INACTIVE by administrator request
# lctl get_param *.*.active
mdc.myth-MDT0000-mdc-ffff9a4ee3146800.active=0
mdc.myth-MDT0001-mdc-ffff9a4ee3146800.active=0
osc.myth-OST0000-osc-ffff9a4ee3146800.active=0
osc.myth-OST0001-osc-ffff9a4ee3146800.active=0
osc.myth-OST0002-osc-ffff9a4ee3146800.active=0
osc.myth-OST0003-osc-ffff9a4ee3146800.active=0
osc.myth-OST0004-osc-ffff9a4ee3146800.active=0
# df /myth
LustreError: 1029578:0:(file.c:5579:ll_inode_revalidate_fini()) myth: revalidate FID [0x208001:0x1c08b680:0x0] error: rc = -108
df: /myth: Cannot send after transport endpoint shutdown