Re: ps hang in 241-pre10

[torvalds@transmeta.com (Linus Torvalds)]

In article <3A737061.F1B914A3@linux.com>, David Ford  <david@linux.com> wrote:
>Unfortunately klogd reads /proc....erg.
>
>So the following is a painstakingly slow hand translation, I'll only print
>the D state entries unless someone asks otherwise.

You seem to be pretty much able to reproduce this at will, right?

I'd really like to see the raw System.map and dmesg output if your
syslogd doesn't do a proper job of getting the symbols interpreted: just
send the things by email, and I'll put something together.  It's too
hard to interpret your half-way decoded thing, and I really want to see
what this xmms thing is doing.. 

>xmms      D CACC5EA8  4116   713    155   715  (NOTLB)    1493   674
>Call Trace: [<c0124966>] [<c012412f>] [<c01242b8>] [<c0144138>] [<c014238e>]
>[<c0131cd0>] [<c01236b2>]
>       [<c01239f2>] [<c01ac5ca>] [<c010d1f6>] [<c0108e7c>] [<c0108d5f>]
>
>c01248e4 T ___wait_on_page
>c0124984 t __lock_page
>
>c01240dc t truncate_list_pages
>c0124268 T truncate_inode_pages
>c01242d4 t writeout_one_page

This is the smoking gun here, I bet, but I'd like to make sure I see the
whole thing. I don't see _why_ we'd have deadlocked on __wait_on_page(),
but I think this is the thread that hangs on to the mm semaphore.

		Linus
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