You are right, I looked over this state with kdb, and usb-storage
waited in usb_stor_bulk_transfer_sg, which does pass GFP_NOIO
at this scenario.
It looked suspicious though, because OOM handling was invoked
from many processes, and it didn't print about any process being
killed and it didn't complain about no processes to kill either.
(I'll look more into this, perhaps there's an OOM handling bug)
BTW, soft-rebooting the machine in that state made the USB
storage device (LEXAR, JD LIGHTNING II) inaccessible to the
BIOS. I had to do a complete power cycle in order or the BIOS
to see it again.
XIV LTD, http://www.yqcomputer.com/
da-x (at) monatomic.org, dan (at) xiv.co.il
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