Finding a rogue IO source

[Phillip Susi]

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I have an unused disk ( no mounted filesystems ) that I put to sleep (
hdparm -Y ) and every 10 minutes, the link is reset to process a
request coming from a short lived process named "pool".  I think it is
a kernel work queue.  I inserted a dump_stack() but it stops when it
gets to the syscall and so doesn't trace back into what work item is
running.  How can I figure out what work item is doing this?

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