[ 979.223808] BTRFS: error (device sdc2) in __btrfs_cow_block:1080: errno=-5
IO failure
Are there no other messages in syslog? "IO failure" (from
fs/btrfs/super.c:75) sounds like a problem with the underlying device.
Maybe try w/o the "discard" mount option? Does "cat /dev/sdc2 > /dev/null"
complete w/o errors?
The messages prior to that were a few 100 seconds older and unrelated, I
think it was something from usb.
The dump from Ubuntu worked without any error messages. The device also
was still accessible, only RO. I could power down the system normal.
Alexander
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