On Wed, Nov 30, 2016 at 10:14:50AM -0800, Linus Torvalds wrote:

Anyway, none of this seems new per se. I'm adding Kent and Jens to the
cc (Tejun already was), in the hope that maybe they have some idea how
to control the nasty worst-case behavior wrt workqueue lockup (it's
not really a "lockup", it looks like it's just hundreds of workqueues
all waiting for IO to complete and much too deep IO queues).

 
I'll take your word for it, all I got in the end was
Kernel panic - not syncing: Hard LOCKUP
and the system stone dead when I woke up hours later.

And I think your NMI watchdog then turns the "system is no longer
responsive" into an actual kernel panic.

Ah, I see.

Thanks for the reply, and sorry for bringing in that separate thread
from the btrfs mailing list, which effectively was a suggestion similar
to what you're saying here too.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901

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