linux-kernel - Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov

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Date:   Wed, 21 Oct 2020 18:13:01 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@....de>, kernel-team@...roid.com
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        David Laight <David.Laight@...lab.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, io-uring@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move
 rw_copy_check_uvector() into lib/iov_iter.c"

On Fri, Sep 25, 2020 at 06:51:39AM +0200, Christoph Hellwig wrote:
> From: David Laight <David.Laight@...LAB.COM>
> 
> This lets the compiler inline it into import_iovec() generating
> much better code.
> 
> Signed-off-by: David Laight <david.laight@...lab.com>
> Signed-off-by: Christoph Hellwig <hch@....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