Am 13.9.2018 10:40, schrieb Nikolay Borisov:
On 13.09.2018 11:34, Jürgen Herrmann wrote:
Hello!
I have a newly installed laptop running a freshly installed (abt. two
months ago) laptop running latest linux mint 19. Root filesystem is on
a
1TB Samsung 860 M.2 SSD with btrfs on top of a LUKS encrypted 900G
partition. Timeshift-btrfs is enabled for root (@) and home (@home)
subvolumes. I want to transfer snapshots to a server with a separated
disk via "btrfs send" and ssh.
Here's the list of snapshot directories, each containing tow snapshots
for root and home:
drwxr-xr-x 1 root root 30 Sep 12 22:08 2018-08-16_20-00-01
drwxr-xr-x 1 root root 30 Aug 17 14:00 2018-08-17_14-00-02
drwxr-xr-x 1 root root 30 Aug 23 20:00 2018-08-23_20-00-01
drwxr-xr-x 1 root root 30 Aug 30 20:00 2018-08-30_20-00-01
drwxr-xr-x 1 root root 30 Sep 6 20:00 2018-09-06_20-00-01
drwxr-xr-x 1 root root 30 Sep 6 22:00 2018-09-06_22-00-01
drwxr-xr-x 1 root root 30 Sep 8 16:00 2018-09-08_16-00-01
drwxr-xr-x 1 root root 30 Sep 10 20:00 2018-09-10_20-00-02
drwxr-xr-x 1 root root 30 Sep 11 21:00 2018-09-11_21-00-02
drwxr-xr-x 1 root root 30 Sep 12 21:00 2018-09-12_21-00-01
"btrfs send
/mnt/timeshift/backup/timeshift-btrfs/snapshots/2018-08-16_20-00-01/@
/dev/null" results in the btrfs task taking 100% cpu time on one cpu
and then all IO is blocked -> only reboot can solve the hang.
The crash does not happen immediately, as i was on the road using
cellular connection it seemed fine at first. That's how I found out
that
it transfers ~140MB of data before hanging. The snapshot is created on
the server and contains data (du shows abt 140MB).
I am running vanilla kernel 4.18.6 (compiled by myself) and btrfs
progs
4.17.1 compiled from source.
Here's the btrfs filesystem info:
Label: none uuid: a914c141-72bf-448b-847f-d64ee82d8b7b
Total devices 1 FS bytes used 342.85GiB
devid 1 size 875.44GiB used 357.05GiB path
/dev/mapper/sda3_crypt
A scrub shows no errors:
scrub status for a914c141-72bf-448b-847f-d64ee82d8b7b
scrub started at Thu Sep 13 10:20:18 2018 and finished after
00:12:19
total bytes scrubbed: 342.78GiB with 0 errors
What can I do to help debugging this issue?
You should provide output of echo w > /proc/sysrq-trigger. Also
sample the stack of /proc/[pid of btrfs send]/stack to see if it is
changing.
Best regards,
Jürgen
Hello!
dmesg output can be found here:
https://pastebin.com/g86dPGSZ
stacks can be found here:
https://pastebin.com/dCt1YgJp
Best regards,
Jürgen
--
Jürgen Herrmann
https://t-5.eu
ALbertstraße 2
94327 Bogen
