Groups > linux.kernel > #1620640

Re: iov_iter_pipe warning.

From	Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups	linux.kernel
Subject	Re: iov_iter_pipe warning.
Date	2017-04-10 21:30 +0200
Message-ID	<tuNaF-50X-11@gated-at.bofh.it> (permalink)
References	<tnz2O-8X-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, Mar 21, 2017 at 04:59:01PM -0400, Dave Jones wrote:
> WARNING: CPU: 0 PID: 9290 at lib/iov_iter.c:836 iov_iter_pipe+0x71/0x80
> CPU: 0 PID: 9290 Comm: trinity-c7 Not tainted 4.11.0-rc3-think+ #3 
> Call Trace:
>  dump_stack+0x68/0x93
>  __warn+0xcb/0xf0
>  warn_slowpath_null+0x1d/0x20
>  iov_iter_pipe+0x71/0x80
>  generic_file_splice_read+0x37/0x140
>  do_splice_to+0x79/0x90
>  splice_direct_to_actor+0xb8/0x220
>  ? generic_pipe_buf_nosteal+0x10/0x10
>  do_splice_direct+0x9e/0xd0
>  do_sendfile+0x1d7/0x3c0
>  SyS_sendfile64+0x73/0xe0
>  do_syscall_64+0x66/0x1d0

Cute...  We have ->splice_read() called in attempt to shove something into
a full internal pipe.  How do you achieve that situation?  actor() callback
claiming to have drained more than it actually had to?

Do you have a reliable reproducer?

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Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-10 21:30 +0200
  Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-10 21:50 +0200
    Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-10 22:00 +0200
      Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-11 01:50 +0200
        Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-11 02:30 +0200
          Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-11 05:10 +0200
            Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-11 05:30 +0200
              Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-11 23:00 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-11 23:20 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 00:30 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 01:30 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 01:40 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 01:50 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 01:50 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 02:00 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 02:10 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 02:20 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 03:00 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 03:20 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 04:30 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 05:00 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 16:40 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 17:30 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 18:30 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 19:10 +0200
                Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-04-12 21:10 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-21 21:10 +0200
                Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-04-12 02:00 +0200

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