My computer was up for several months. On Saturday I came home from church and 
found it unresponsive except that I could move the mouse cursor and make the 
keyboard lights blink. I tried to shell in from another computer; I got a 
connection, but not a login prompt. I rebooted it with the power button and 
copied the syslog file that contains the incident. I saw "btrfs" several times 
in the section of log.

This morning, I was rsyncing some files and the same thing happened, except 
that the screen was stuck in the middle of flipping through windows with alt-
tab and I was able to switch to a console, log in as root, and reboot. Again I 
found "btrfs" in syslog.

Running dmesg produces too much information. Here is the rest of the info:
root@puma:/home/phma# uname -a
Linux puma 5.15.15-76051515-generic #202201160435~1642693824~20.04~97db1bb-
Ubuntu SMP Fri Jan 21 14: x86_64 x86_64 x86_64 GNU/Linux
root@puma:/home/phma# btrfs --version
btrfs-progs v5.4.1 
root@puma:/home/phma# btrfs fi show
Label: none  uuid: d0137494-fe35-488f-b0da-fdbe075b8832
        Total devices 1 FS bytes used 72.88GiB
        devid    1 size 673.51GiB used 75.02GiB path /dev/mapper/concolor-big

Label: none  uuid: 174643ac-cb44-46a9-a5a4-5fb5e9a4e79f
        Total devices 1 FS bytes used 48.84GiB
        devid    1 size 100.00GiB used 57.02GiB path /dev/mapper/concolor-
rootcopy

Label: none  uuid: 155a20c7-2264-4923-b082-288a3c146384
        Total devices 1 FS bytes used 101.49GiB
        devid    1 size 158.00GiB used 134.02GiB path /dev/mapper/concolor-
cougar

Label: none  uuid: 10c61748-efe7-4b9c-b1f7-041dc45d894b
        Total devices 1 FS bytes used 39.38GiB
        devid    1 size 127.98GiB used 53.04GiB path /dev/mapper/cougar-crypt

Label: none  uuid: 1f5a6f23-a7ef-46c6-92b1-84fc2f684931
        Total devices 1 FS bytes used 92.58GiB
        devid    1 size 158.00GiB used 131.00GiB path /dev/mapper/puma-cougar

root@puma:/home/phma# btrfs fi df /big
Data, single: total=74.01GiB, used=72.78GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=1.01GiB, used=101.59MiB
GlobalReserve, single: total=92.41MiB, used=0.00B
root@puma:/home/phma# btrfs fi df /rootcopy
Data, single: total=55.01GiB, used=47.68GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=2.01GiB, used=1.16GiB
GlobalReserve, single: total=113.17MiB, used=0.00B
root@puma:/home/phma# btrfs fi df /home
Data, single: total=132.01GiB, used=100.23GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=2.01GiB, used=1.26GiB
GlobalReserve, single: total=321.31MiB, used=0.00B
root@puma:/home/phma# btrfs fi df /crypt
Data, single: total=52.01GiB, used=39.29GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=91.14MiB
GlobalReserve, single: total=45.91MiB, used=0.00B
root@puma:/home/phma# btrfs fi df /olv
Data, single: total=52.01GiB, used=39.29GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=91.14MiB
GlobalReserve, single: total=45.91MiB, used=0.00B
root@puma:/home/phma# btrfs fi df /backup
Data, single: total=52.01GiB, used=39.29GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.00GiB, used=91.14MiB
GlobalReserve, single: total=45.91MiB, used=0.00B

The kernel I was running on Saturday may be older.

Please copy me, I'm not on the mailing list.

Pierre
-- 
The gostak pelled at the fostin lutt for darfs for her martle plave.
The darfs had smibbed, the lutt was thale, and the pilter had nothing snave.