On Fri, May 01, 2020 at 03:06:26PM +0000, Luis Chamberlain wrote:

quoted

You have access to a block device here, please use dev_warn() instead
here for that, that makes it obvious as to what device a "concurrent
blktrace" was attempted for.

The block device may be empty, one example is for scsi-generic, but I'll
use buts->name.

Is blktrace on /dev/sg something we intentionally support, or just by
some accident of history?  Given all the pains it causes I'd be tempted
to just remove the support and see if anyone screams.