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From:   Chuck Lever III <chuck.lever@oracle.com>
To:     Olga Kornievskaia <aglo@umich.edu>
CC:     Benjamin Coddington <bcodding@redhat.com>,
        Jeff Layton <jlayton@kernel.org>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: Is this nfsd kernel oops known?
Thread-Topic: Is this nfsd kernel oops known?
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Date:   Wed, 7 Sep 2022 04:58:37 +0000
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> On Sep 6, 2022, at 3:12 PM, Olga Kornievskaia <aglo@umich.edu> wrote:
>=20
> On Tue, Sep 6, 2022 at 2:28 PM Benjamin Coddington <bcodding@redhat.com> =
wrote:
>>=20
>> On 1 Sep 2022, at 21:27, Olga Kornievskaia wrote:
>>=20
>>> Thanks Chuck. I first, based on a hunch, narrowed down that it's
>>> coming from Al Viro's merge commit. Then I git bisected his 32patches
>>> to the following commit f0f6b614f83dbae99d283b7b12ab5dd2e04df979
>>=20
>> No crash for me after reverting f0f6b614f83dbae99d283b7b12ab5dd2e04df979=
.
>=20
> I second that. No crash after a revert here.

I bisected the new xfstests failures to the same commit:

f0f6b614f83dbae99d283b7b12ab5dd2e04df979 is the first bad commit
commit f0f6b614f83dbae99d283b7b12ab5dd2e04df979
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Thu Jun 23 17:21:37 2022 -0400

    copy_page_to_iter(): don't split high-order page in case of ITER_PIPE
   =20
    ... just shove it into one pipe_buffer.
   =20
    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

 lib/iov_iter.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)


--
Chuck Lever