Re: bdflush and postgres stuck in D state

[David Rees]

On Tue, Sep 18, 2001 at 10:49:10AM -0700, Andrew Morton wrote:
> Jakob Østergaard wrote:
> > 
> > Sorry for following up on my own post, I have a little extra
> > information.
> > 
> > I started a g++ job to try to force the machine to write out some dirty
> > buffers before I reboot.   g++ now hangs along with two sync's, bdflush
> > and the postgres process.
> > 
> 
> Since 2.4.7 several bugs have been fixed in RAID1 which would
> cause this, including a missing blockdevice unplug and failure
> to hang onto the supposedly-reserved RAID1 buffer-heads.

Even kernels as recent as 2.4.9 have this bug.  See this thread for more
info and a patch which fixes this bug.

The thread:
http://marc.theaimsgroup.com/?t=99911655500004&w=2&r=1

The patch:
http://marc.theaimsgroup.com/?l=linux-kernel&m=99913223508789&w=2

-Dave