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FS#61471 - [btrfs-progs] Send from snap on / fails

Attached to Project: Arch Linux
Opened by Jan Alexander Steffens (heftig) - Saturday, 19 January 2019, 23:43 GMT
Last edited by Jan Alexander Steffens (heftig) - Saturday, 02 February 2019, 23:01 GMT
Task Type Bug Report
Category Packages: Testing
Status Closed
Assigned To S├ębastien Luttringer (seblu)
Architecture All
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No


Since 4.20, btrfs send fails for me:

~/vc/btrfs-progs> sudo btrfs send /mnt/snapshot-2019-01-19T23:25:29+00:00 >/dev/null
ERROR: failed to determine mount point for /mnt/snapshot-2019-01-19T23:25:29+00:00: No such file or directory

The snapshot is part of the FS mounted at /.
4.19.1 works fine. Send from another FS not mounted at / works with 4.20, as well.

Bisected to commit cb8abdd (Btrfs-progs: fix mount point detection due to partial prefix match).

Upstream report:
This task depends upon

Closed by  Jan Alexander Steffens (heftig)
Saturday, 02 February 2019, 23:01 GMT
Reason for closing:  Fixed
Additional comments about closing:  btrfs-progs 4.20.1-2
Comment by S├ębastien Luttringer (seblu) - Wednesday, 23 January 2019, 14:32 GMT
Unfortunately, there is no fix shipped in 4.20.1.
Comment by Jan Alexander Steffens (heftig) - Wednesday, 23 January 2019, 15:30 GMT
We could revert the commit?