Re: Locking problems with Linux 4.9 with NFSD and `fs/iomap.c`

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On Mon, May 08, 2017 at 09:18:46AM -0400, Brian Foster wrote:
> What exactly is a NULL call? Can this be reproduced easily?

It's a sunrpc concept of a dummy procedure that does nothing but
ensures the communication works.

> It may also be interesting to enable the xfs_zero_eof() tracepoint
> (trace-cmd start -e 'xfs:xfs_zero_eof') and see what the last few
> entries are from /sys/kernel/debug/tracing/trace_pipe.

Yeah.  I have a customer that uses Linux 4.9-stable with XFS and
nfsd exports in a product, so it's certainly not something that happens
too easily, but memory pressure might be a factor.   I'll see if
I can figure out what happens if I inject ENOMEM in the said
spot.
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