From: Dave Jones <davej@codemonkey.org.uk>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: iov_iter_pipe warning.
Date: Tue, 11 Apr 2017 19:34:37 -0400 [thread overview]
Message-ID: <20170411233437.jmkghan72fb4fclg@codemonkey.org.uk> (raw)
In-Reply-To: <20170411232842.GI29622@ZenIV.linux.org.uk>
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]
dir test is running from is /home on nfs, so that makes sense.
> How about adding to that printk (under if (WARN_ON()) something like
> file = sd->u.file;
> if (file->f_op->splice_write == generic_splice_sendpage) {
> struct socket *sock = file->private_data;
> printk(KERN_ERR "socket [%d, %p]\n", sock->type, sock->ops);
> }
> printk(KERN_ERR "in->f_op = %p\n", in->f_op);
Ack.
> 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.
Dave.
next prev parent reply other threads:[~2017-04-11 23:34 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 [this message]
2017-04-11 23:48 ` Al Viro
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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