Re: shutdown umount hangs

[utz lehmann <xfs@xxxxxxxxxx>]

Hi

i will do this on monday.

utz

Russell Cattelan [cattelan@xxxxxxxxxxx] wrote:
> Utz Lehmann wrote:
> 
> Well drat...  seems to be a really problem here.
> 
> Not sure we are going to be able to debug this remotely, hopefully we will be 
> able
> to reproduce the problem here.
> But if you could extract a bit more info....
> 
> load the modules kdbm_pg and xfsidbg.
> once the system is hung break into kdb backtrace
> the unmount command, then grab the first address in
> the pagebuf_iostart function and feed it to  kdb
> kdb> pb <address>
> 
> We are looking for the pincount  and the lock status.
> It would seem somehow the pg_delwri_flush is waiting for
> the pagebuf to get unpinned, which should have already happened
> before this point.
> My guess is that somehow a pagebuf is getting re-inserted into the delwri 
> queue
> while the flush code in trying to work on pushing everything out.