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: Fri, 28 Apr 2017 11:29:55 -0400 [thread overview]
Message-ID: <20170428152955.mafs3f22srmm34aw@codemonkey.org.uk> (raw)
In-Reply-To: <20170421175430.GT29622@ZenIV.linux.org.uk>
On Fri, Apr 21, 2017 at 06:54:30PM +0100, Al Viro wrote:
> On Wed, Apr 12, 2017 at 03:03:18PM -0400, Dave Jones wrote:
>
> > Well it's been running an hour without incident, which looks promising.
> > I'll leave it run, but I'd say you're on the right track given how quick
> > it reproduced so far.
>
> Could you try this and see if it works? What happens is that unlike
> e.g. generic_file_read_iter/generic_file_write_iter, NFS O_DIRECT handling
> does not make sure that iov_iter had been advanced by the amount
> actually transferred - it is left advanced by the amount *requested*.
Crap. So I never ran it long enough it seems. I can still hit that trace.
I re-added one of your earlier debug patches, and got this..
WARNING: CPU: 1 PID: 20100 at fs/splice.c:297 test_it+0x7d/0x120
CPU: 1 PID: 20100 Comm: trinity-c49 Not tainted 4.11.0-rc8-think+ #3
Call Trace:
dump_stack+0x68/0x93
__warn+0xcb/0xf0
warn_slowpath_null+0x1d/0x20
test_it+0x7d/0x120
generic_file_splice_read+0x19a/0x1e0
do_splice_to+0x79/0x90
splice_direct_to_actor+0xc6/0x280
? generic_pipe_buf_nosteal+0x10/0x10
do_splice_direct+0x9e/0xd0
do_sendfile+0x1d7/0x3c0
SyS_sendfile64+0xc9/0xe0
do_syscall_64+0x66/0x1d0
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f8b83b59099
RSP: 002b:00007ffd7967da68 EFLAGS: 00000246
ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000028 RCX: 00007f8b83b59099
RDX: 0000000000000000 RSI: 0000000000000131 RDI: 0000000000000195
RBP: 00007f8b840d1000 R08: 0000000000000073 R09: fffffffffffffffc
R10: 000000000000040f R11: 0000000000000246 R12: 0000000000000002
R13: 00007f8b840d1048 R14: 00007f8b8422fad8 R15: 00007f8b840d1000
---[ end trace 70d344adaede0734 ]---
asked to read 1039, claims to have read 62
actual size of data in pipe 977
[0:977
]
f_op: ffffffffa02dd980, f_flags: 313346, pos: 4478229749/4478229811, size: 4478229811
------------[ cut here ]------------
WARNING: CPU: 1 PID: 20100 at fs/splice.c:1017 splice_direct_to_actor+0x13f/0x280
CPU: 1 PID: 20100 Comm: trinity-c49 Tainted: G W 4.11.0-rc8-think+ #3
Call Trace:
dump_stack+0x68/0x93
__warn+0xcb/0xf0
warn_slowpath_null+0x1d/0x20
splice_direct_to_actor+0x13f/0x280
? generic_pipe_buf_nosteal+0x10/0x10
do_splice_direct+0x9e/0xd0
do_sendfile+0x1d7/0x3c0
SyS_sendfile64+0xc9/0xe0
do_syscall_64+0x66/0x1d0
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f8b83b59099
RSP: 002b:00007ffd7967da68 EFLAGS: 00000246
ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000028 RCX: 00007f8b83b59099
RDX: 0000000000000000 RSI: 0000000000000131 RDI: 0000000000000195
RBP: 00007f8b840d1000 R08: 0000000000000073 R09: fffffffffffffffc
R10: 000000000000040f R11: 0000000000000246 R12: 0000000000000002
R13: 00007f8b840d1048 R14: 00007f8b8422fad8 R15: 00007f8b840d1000
---[ end trace 70d344adaede0735 ]---
in->f_op = ffffffffa02dd980, ->splice_write = ffffffff812b1db0
$ grep ffffffffa02dd980 /proc/kallsyms
ffffffffa02dd980 r nfs4_file_operations [nfsv4]
$ grep ffffffff812b1db0 /proc/kallsyms
ffffffff812b1db0 T iter_file_splice_write
next prev parent reply other threads:[~2017-04-28 15:30 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
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 [this message]
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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