Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c"

Greg KH
2020-10-21T16:12:23Z

On Fri, Sep 25, 2020 at 06:51:39AM +0200, Christoph Hellwig wrote:
> From: David Laight <David.Laight@ACULAB.COM>
>
> This lets the compiler inline it into import_iovec() generating
> much better code.
>
> Signed-off-by: David Laight <david.laight@aculab.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> fs/read_write.c | 179 ------------------------------------------------
> lib/iov_iter.c | 176 +++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 176 insertions(+), 179 deletions(-)

Strangely, this commit causes a regression in Linus's tree right now.

I can't really figure out what the regression is, only that this commit
triggers a "large Android system binary" from working properly. There's
no kernel log messages anywhere, and I don't have any way to strace the
thing in the testing framework, so any hints that people can provide
would be most appreciated.

thanks,

greg k-h