Description: Improper lock operation in btrfs
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2026485
 https://lkml.org/lkml/2021/10/18/885
 https://lkml.org/lkml/2021/9/13/2565
Notes:
 bwh> Commit message says the fix is applicable to 5.4 onward,
 bwh> but earlier versions seem to have the same bug.
Bugs:
upstream: released (5.15-rc6) [19ea40dddf1833db868533958ca066f368862211]
5.10-upstream-stable: released (5.10.75) [206868a5b6c14adc4098dd3210a2f7510d97a670]
4.19-upstream-stable: released (4.19.235) [73d55fa1b9310573f623195a4f7ab3170bbaf248]
4.9-upstream-stable: released (4.9.307) [43bfa08ba62a1ca7a22365c7092e491e04327efb]
sid: released (5.14.16-1)
5.10-bullseye-security: released (5.10.84-1)
4.19-buster-security: released (4.19.235-1)
4.9-stretch-security: released (4.9.320-2)