Basti’s Buggy Blog

Poking at software.

LVM LUKS Volume on External USB HDD Buffer I/O Error After Suspend

Symptoms

  • External USB HDD with LUKS in LVM cannot be mounted after suspend
  • Mounting or unlocking through any Gnome GUI results in a GNOME Error “Error unlocking device” Gnome GUI error
  • Unlocking the LUKS volume gives an error:
# cryptsetup open /dev/extvg/extlv ext-hdd
Device /dev/extvg/extlv is not a valid LUKS device.
  • journalctl -k -b shows errors after mount attempt:
buffer_io_error: 78 callbacks suppressed
Buffer I/O error on dev dm-3, logical block 0, async page read
Buffer I/O error on dev dm-3, logical block 1, async page read
Buffer I/O error on dev dm-3, logical block 2, async page read
Buffer I/O error on dev dm-3, logical block 3, async page read
Buffer I/O error on dev dm-3, logical block 4, async page read
Buffer I/O error on dev dm-3, logical block 5, async page read
Buffer I/O error on dev dm-3, logical block 6, async page read
Buffer I/O error on dev dm-3, logical block 7, async page read
Buffer I/O error on dev dm-3, logical block 0, async page read
Buffer I/O error on dev dm-3, logical block 1, async page read

Cause

Unknown

Solution

Recreating the /dev/mapper symlinks seems to help.

  1. Lookup the dm-ID (dm-3 here)
# ls -la /dev/mapper/
total 0
drwxr-xr-x  2 root root     160 18. Jan 19:26 .
drwxr-xr-x 24 root root    4600 18. Jan 19:28 ..
...
crw-------  1 root root 10, 236 17. Jan 22:49 control
lrwxrwxrwx  1 root root       7 18. Jan 19:06 extvg-extlv -> ../dm-3
  1. Remove the LVM volume via dmsetup
# dmsetup remove /dev/dm-3
  1. Check the attributes in the LVM logical volumes scanner (lvs): The a (active) attribute is missing!
# lvs
  LV          VG      Attr       LSize
...
  other-lv    arch-vg -wi-ao---- 220.97g
  extlv       extvg   -wi-------  <7.28t
  1. Set the volume group to active to create the /dev/mapper symlinks
vgchange -a y extvg
  1. Mount your drive as usual

See Also