A scrub now gave:
# btrfs scrub start -Br /dev/disk/by-label/system
ERROR: scrubbing /dev/disk/by-label/system failed for device id 1: ret=-1,
errno=5 (Input/output error)
scrub canceled for b6050e38-716a-40c3-a8df-fcf1dd7e655d
scrub started at Wed Feb 21 17:42:39 2018 and was aborted after 00:04:18
total bytes scrubbed: 116.59GiB with 1 errors
error details: csum=1
corrected errors: 0, uncorrectable errors: 0, unverified errors: 0
with that in the kernel log
Feb 21 17:43:09 heisenberg kernel: BTRFS warning (device dm-0): checksum error
at logical 16401395712 on dev /dev/mapper/system, sector 32033976, root 1830,
inode 42609350, offset 6754201600, length 4096, links 1 (path:
var/lib/libvirt/images/subsurface.qcow2)
Feb 21 17:43:09 heisenberg kernel: BTRFS warning (device dm-0): checksum error
at logical 16401395712 on dev /dev/mapper/system, sector 32033976, root 257,
inode 42609350, offset 6754201600, length 4096, links 1 (path:
var/lib/libvirt/images/subsurface.qcow2)
Feb 21 17:43:09 heisenberg kernel: BTRFS error (device dm-0): bdev
/dev/mapper/system errs: wr 0, rd 0, flush 0, corrupt 1, gen 0
Feb 21 17:46:13 heisenberg kernel: usb 1-2: USB disconnect, device number 2
Feb 21 17:46:57 heisenberg kernel: btrfs_printk: 128 callbacks suppressed
Feb 21 17:46:57 heisenberg kernel: BTRFS critical (device dm-0): unable to find
logical 4503658729209856 length 16384
Feb 21 17:46:57 heisenberg kernel: BTRFS critical (device dm-0): unable to find
logical 4503658729209856 length 4096
Feb 21 17:46:57 heisenberg kernel: BTRFS critical (device dm-0): unable to find
logical 4503658729209856 length 4096
Feb 21 17:46:57 heisenberg kernel: BTRFS critical (device dm-0): unable to find
logical 4503658729209856 length 16384
any idea on what to do?
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