Re: 3.15rc2 hanging processes on exit.

[Dave Jones]

On Tue, Apr 22, 2014 at 11:57:50AM -0700, Linus Torvalds wrote:
 
 > Are you testing anything new? Or is this strictly new to 3.15? The
 > only thing in this area we do differently is commit cda540ace6a1 ("mm:
 > get_user_pages(write,force) refuse to COW in shared areas"), but
 > fault_in_user_writeable() never used the force bit afaik. Adding Hugh
 > just in case.

You mean new as in additions to trinity ?
The only recent chance that might be relevant is that now, when I create
struct iovec's to pass to syscalls, I populate them solely with results
from mmap's rather than a mix of mmaps and mallocs.  The mmaps could be
all kinds of sizes, types etc. [*]  So now there's more chance I guess
that an iovec contains a bunch of hugepages, or read-only pages etc.

I took another slightly longer trace of what's going on at
http://codemonkey.org.uk/junk/trace2.out
But it looks to me to be pretty similar.

	Dave

[*] https://github.com/kernelslacker/trinity/commit/1e73841971717256089d63e9f7fc33972d48028c
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