Filesystem sometimes Hangs

Mon, 29 Mar 2021 04:12:09 -0700 

Hello,
I have a filesystem which is sometimes very slow, or even currently hangs deleting a file (plain and simple rm in bash). 

Label: 'DataPool1'  uuid: c4a6a2c9-5cf0-49b8-812a-0784953f9ba3
        Total devices 2 FS bytes used 5.65TiB
        devid    1 size 7.28TiB used 6.71TiB path /dev/sda1
        devid    2 size 7.28TiB used 6.71TiB path /dev/sdh1

I did run a scrub without errors.

Checking the logs, I find:
dmesg -T |grep -i btrfs
[Mo Mär 29 09:29:16 2021] Btrfs loaded, crc32c=crc32c-intel

[Mo Mär 29 09:29:16 2021] BTRFS: device label DataPool1 devid 2 transid 
649014 /dev/sdh1 scanned by btrfs (213)
[Mo Mär 29 09:29:16 2021] BTRFS: device label DataPool1 devid 1 transid 
649014 /dev/sda1 scanned by btrfs (213)
[Mo Mär 29 09:29:16 2021] BTRFS: device label Daten devid 1 transid 
254377 /dev/sdd2 scanned by btrfs (213)
[Mo Mär 29 09:29:16 2021] BTRFS: device label DockerImages devid 1 
transid 209067 /dev/sdc2 scanned by btrfs (213)
[Mo Mär 29 09:29:21 2021] BTRFS info (device sda1): disk space caching 
is enabled

[Mo Mär 29 09:29:21 2021] BTRFS info (device sda1): has skinny extents

[Mo Mär 29 09:29:21 2021] BTRFS info (device sdd2): enabling ssd 
optimizations
[Mo Mär 29 09:29:21 2021] BTRFS info (device sdd2): disk space caching 
is enabled

[Mo Mär 29 09:29:21 2021] BTRFS info (device sdd2): has skinny extents

[Mo Mär 29 09:29:21 2021] BTRFS info (device sdc2): turning on sync 
discard
[Mo Mär 29 09:29:21 2021] BTRFS info (device sdc2): enabling ssd 
optimizations
[Mo Mär 29 09:29:21 2021] BTRFS info (device sdc2): disk space caching 
is enabled

[Mo Mär 29 09:29:21 2021] BTRFS info (device sdc2): has skinny extents

[Mo Mär 29 09:29:22 2021] BTRFS info (device sda1): bdev /dev/sda1 errs: 
wr 133, rd 133, flush 0, corrupt 0, gen 1


Maybe, the last line is concerning?


Syslog tells me:

Mar 28 20:22:19 homeserver kernel: [1297978.357508] task:btrfs-cleaner   
state:D stack:    0 pid:20078 ppid:     2 flags:0x00004000
Mar 28 20:22:19 homeserver kernel: [1297978.357547]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357564]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357577]  
btrfs_drop_snapshot+0x90/0x7f0 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357594]  ? 
btrfs_delete_unused_bgs+0x3e/0x850 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357609]  
btrfs_clean_one_deleted_snapshot+0xd7/0x130 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357622]  
cleaner_kthread+0xfa/0x120 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.357636]  ? 
btrfs_alloc_root+0x3d0/0x3d0 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.360473]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.360488]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.360503]  
btrfs_create+0x58/0x1f0 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.363057]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.363072]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:22:19 homeserver kernel: [1297978.363086]  
btrfs_rmdir+0x5c/0x180 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024321] task:btrfs-cleaner   
state:D stack:    0 pid:20078 ppid:     2 flags:0x00004000
Mar 28 20:26:20 homeserver kernel: [1298220.024382]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024419]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024442]  
btrfs_drop_snapshot+0x90/0x7f0 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024476]  ? 
btrfs_delete_unused_bgs+0x3e/0x850 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024504]  
btrfs_clean_one_deleted_snapshot+0xd7/0x130 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024531]  
cleaner_kthread+0xfa/0x120 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.024558]  ? 
btrfs_alloc_root+0x3d0/0x3d0 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.030300]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.030331]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:26:20 homeserver kernel: [1298220.030361]  
btrfs_create+0x58/0x1f0 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854109] task:btrfs-cleaner   
state:D stack:    0 pid:20078 ppid:     2 flags:0x00004000
Mar 28 20:28:21 homeserver kernel: [1298340.854151]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854169]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854183]  
btrfs_drop_snapshot+0x90/0x7f0 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854202]  ? 
btrfs_delete_unused_bgs+0x3e/0x850 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854218]  
btrfs_clean_one_deleted_snapshot+0xd7/0x130 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854232]  
cleaner_kthread+0xfa/0x120 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.854247]  ? 
btrfs_alloc_root+0x3d0/0x3d0 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.857610]  
wait_current_trans+0xc2/0x120 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.857627]  
start_transaction+0x46d/0x540 [btrfs]
Mar 28 20:28:21 homeserver kernel: [1298340.857643]  
btrfs_create+0x58/0x1f0 [btrfs]
Mar 28 20:58:34 homeserver kernel: [1300153.336160] task:btrfs-transacti 
state:D stack:    0 pid:20080 ppid:     2 flags:0x00004000
Mar 28 20:58:34 homeserver kernel: [1300153.336215]  
btrfs_commit_transaction+0x92b/0xa50 [btrfs]
Mar 28 20:58:34 homeserver kernel: [1300153.336246]  
transaction_kthread+0x15d/0x180 [btrfs]
Mar 28 20:58:34 homeserver kernel: [1300153.336273]  ? 
btrfs_cleanup_transaction+0x590/0x590 [btrfs]



What could I do to find the cause?

Regards,
Hendrik























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