Re: [PATCH block/for-3.3/core] block: an exiting task should beallowed to create io_context

From: Tejun Heo
Date: Wed Dec 28 2011 - 16:19:48 EST

On Wed, Dec 28, 2011 at 09:55:12AM -0800, Tejun Heo wrote:
> Hello,
> On Wed, Dec 28, 2011 at 9:50 AM, Hugh Dickins <hughd@xxxxxxxxxx> wrote:
> > "It's the tmpfs swapping test that I've been running, with variations,
> > for years.  System booted with mem=700M and 1.5G swap, two repetitious
> > make -j20 kernel builds (of a 2.6.24 kernel: I stuck with that because
> > the balance of built to unbuilt source grows smaller with later kernels),
> > one directly in a tmpfs, the other in a 1k-block ext2 (that I drive with
> > ext4's CONFIG_EXT4_USE_FOR_EXT23) on /dev/loop0 on a 450MB tmpfs file."
> >
> > I doubt much of that (quoted from an older mail to someone else about
> > one of the many other bugs it's found) is relevant: maybe just plenty
> > of file I/O and swapping.
> Plain -j4 build isn't triggering anything. I'll try to replicate the condition.

It's not too reliable but I can reproduce it with -j 22 allmodconfig
build inside qemu w/ 512M of memory. I'll try to find out what's
going on.


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