From: Al Viro <viro@ZenIV.linux.org.uk>
To: Dave Jones <davej@codemonkey.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: iov_iter_pipe warning.
Date: Wed, 12 Apr 2017 00:48:21 +0100 [thread overview]
Message-ID: <20170411234820.GJ29622@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20170411233437.jmkghan72fb4fclg@codemonkey.org.uk>
On Tue, Apr 11, 2017 at 07:34:37PM -0400, Dave Jones wrote:
> On Wed, Apr 12, 2017 at 12:28:42AM +0100, Al Viro wrote:
> > On Tue, Apr 11, 2017 at 06:25:02PM -0400, Dave Jones wrote:
> >
> > > ffffffff812b3130 T generic_splice_sendpage
> > >
> > > This one spat out all by itself.
> >
> > No need to print ->f_op for that one - can be only socket_file_ops. Now,
> > the address family of that socket would be interesting...
>
> Turned out to be..
>
> ->splice_write = ffffffff812b2b70 sd->u.file->f_op=ffffffffa02e0980
> $ grep ffffffffa02e0980 /proc/kallsyms
> ffffffffa02e0980 r nfs4_file_operations [nfsv4]
Lovely... So now we get it not only on splice to socket, but on
splice to regular file on NFS as well? That makes lying splice_read()
more likely...
> > Interesting... How about
> > if (res > 0 && pipe == current->splice_pipe) {
> > int idx = pipe->curbuf;
> > int n = pipe->nrbufs;
> > size_t size = 0;
> > while (n--) {
> > size += pipe->bufs[idx++].len;
> > if (idx == pipe->buffers)
> > idx = 0;
> > }
> > WARN_ON(len != res);
> > }
> > just before the return in default_file_splice_read()? WARN_ON_ONCE,
> > perhaps, to avoid cascades...
>
> Sure, up next. Gimme an hour, it seems to be reproducing fairly quickly
> tonight.
Makes sense - now it screams on non-empty pipe in the beginning of loop
body; originally it was only for _full_ pipe (i.e. for leftovers from
several iterations filling the entire thing up), which should've been
harder to trigger...
next prev parent reply other threads:[~2017-04-11 23:48 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-21 20:59 iov_iter_pipe warning Dave Jones
2017-04-05 22:02 ` Dave Jones
2017-04-10 19:28 ` Al Viro
2017-04-10 19:42 ` Dave Jones
2017-04-10 19:57 ` Al Viro
2017-04-10 23:48 ` Dave Jones
2017-04-11 0:22 ` Al Viro
2017-04-11 3:05 ` Dave Jones
2017-04-11 3:28 ` Al Viro
2017-04-11 20:53 ` Dave Jones
2017-04-11 21:12 ` Al Viro
2017-04-11 22:25 ` Dave Jones
2017-04-11 23:28 ` Al Viro
2017-04-11 23:34 ` Dave Jones
2017-04-11 23:48 ` Al Viro [this message]
2017-04-11 23:45 ` Dave Jones
2017-04-11 23:51 ` Al Viro
2017-04-11 23:56 ` Al Viro
2017-04-12 0:06 ` Dave Jones
2017-04-12 0:17 ` Al Viro
2017-04-12 0:58 ` Dave Jones
2017-04-12 1:15 ` Al Viro
2017-04-12 2:29 ` Dave Jones
2017-04-12 2:58 ` Al Viro
2017-04-12 14:35 ` Dave Jones
2017-04-12 15:26 ` Al Viro
2017-04-12 16:27 ` Dave Jones
2017-04-12 17:07 ` Al Viro
2017-04-12 19:03 ` Dave Jones
2017-04-21 17:54 ` Al Viro
2017-04-27 4:19 ` Dave Jones
2017-04-27 16:34 ` Dave Jones
2017-04-27 17:39 ` Al Viro
2017-04-28 15:29 ` Dave Jones
2017-04-28 16:43 ` Al Viro
2017-04-28 16:50 ` Dave Jones
2017-04-28 17:20 ` Al Viro
2017-04-28 18:25 ` Al Viro
2017-04-29 1:58 ` Dave Jones
2017-04-29 2:47 ` Al Viro
2017-04-29 15:51 ` Dave Jones
2017-04-29 20:46 ` [git pull] vfs.git fix (Re: iov_iter_pipe warning.) Al Viro
2017-08-07 20:18 ` iov_iter_pipe warning Dave Jones
2017-08-28 20:31 ` Dave Jones
2017-08-29 4:25 ` Darrick J. Wong
2017-08-30 17:05 ` Dave Jones
2017-08-30 17:13 ` Darrick J. Wong
2017-08-30 17:17 ` Dave Jones
2017-09-06 20:03 ` Dave Jones
2017-09-06 23:46 ` Dave Chinner
2017-09-07 3:48 ` Dave Jones
2017-09-07 4:33 ` Al Viro
2017-09-08 1:04 ` Al Viro
2017-09-10 1:07 ` Dave Jones
2017-09-10 2:57 ` Al Viro
2017-09-10 16:07 ` Dave Jones
2017-09-10 20:05 ` Al Viro
2017-09-10 20:07 ` Dave Jones
2017-09-10 20:33 ` Al Viro
2017-09-10 21:11 ` Dave Chinner
2017-09-10 21:19 ` Al Viro
2017-09-10 22:08 ` Dave Chinner
2017-09-10 23:07 ` Al Viro
2017-09-10 23:15 ` Al Viro
2017-09-11 0:31 ` Dave Chinner
2017-09-11 3:32 ` Al Viro
2017-09-11 6:44 ` Dave Chinner
2017-09-11 20:07 ` Al Viro
2017-09-11 20:17 ` Al Viro
2017-09-12 6:02 ` Dave Chinner
2017-09-12 11:13 ` Al Viro
2017-09-11 12:07 ` Christoph Hellwig
2017-09-11 12:51 ` Al Viro
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