-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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? -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJSQyVcAAoJEJrBOlT6nu75uqkH/j0zivSWfM5XsaDDJZ4gjb8i kvVlaidw9Wu2cv7lgVQB8Ml3eTmqx3ia9I72H9OWJcm324EJ10dD+3jiWAoT2T72 3uojSlbSrZ+0Yp+91EgKjc0/5D2Kz4vVI2rELHYt6ATA8rfLnA6Syrebr3zgY05m 41/pzBieT/lUBpQzWfkVxOtKk+Ma46uAmu1Ipo+G8wwFehbjT/LN57Bv3uFM4M7J sFaBAPCs8nNeAzR+Ud1Yhj6zNZnNct2bIm5oo7Lt7JPuBMzli8q+FVFLrvXOWU8M WXhkalBTYqlmNLXbNsJtYO2IfLFNlNsrYCoyS4IHKvHj8lSzlAKU/dO/OtbJFng= =/RfH -----END PGP SIGNATURE-----