From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
To: Jeff Dike <jdike@addtoit.com>
Cc: user-mode-linux devel <user-mode-linux-devel@lists.sourceforge.net>
Subject: [uml-devel] Deadlock in ubd-aio
Date: Thu, 12 May 2005 17:00:47 +0200 [thread overview]
Message-ID: <42836F9F.4080804@fujitsu-siemens.com> (raw)
Hi Jeff,
there is a problem in ubd / aio on host 2.4, that I can
reproduce easily.
I inserted some counters into submit_aio(), not_aio_thread()
and ubd_intr(). If the problem occurs, both
submit_aio_24() and not_aio_thread() are waiting for a write to
pipe to complete, while both pipes are filled with 57 entries each.
Since SIGIO is blocked at that time, ubd_intr() isn't started,
and the system hangs.
I think, we have to add some "flowcontrol", but have no idea how
to do this.
I don't know, if this could be problem on 2.6 host also.
Bodo
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