Re: iov_iter_pipe warning.

From	Dave Jones <davej@codemonkey.org.uk>
Newsgroups	linux.kernel
Subject	Re: iov_iter_pipe warning.
Date	2017-08-30 19:20 +0200
Message-ID	<ukeOK-2Hq-21@gated-at.bofh.it> (permalink)
References	(5 earlier) <ubWFk-5gn-25@gated-at.bofh.it> <ujyZc-1HG-37@gated-at.bofh.it> <ujGk1-6l8-1@gated-at.bofh.it> <ukeF5-2E4-31@gated-at.bofh.it> <ukeOK-2Hq-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, Aug 30, 2017 at 10:13:43AM -0700, Darrick J. Wong wrote:


 > > I reverted the debug patches mentioned above, and ran trinity for a while again,
 > > and got this which smells really suspiciously related
 > > 
 > > WARNING: CPU: 1 PID: 10380 at fs/iomap.c:993 iomap_dio_rw+0x825/0x840
 > > RAX: 00000000fffffff0 RBX: ffff88046a64d0e8 RCX: 0000000000000000
 > > 
 > > 
 > > 
 > > That's this..
 > > 
 > >  987         ret = filemap_write_and_wait_range(mapping, start, end);
 > >  988         if (ret)
 > >  989                 goto out_free_dio;
 > >  990 
 > >  991         ret = invalidate_inode_pages2_range(mapping,
 > >  992                         start >> PAGE_SHIFT, end >> PAGE_SHIFT);
 > >  993         WARN_ON_ONCE(ret);
 > > 
 > > 
 > > Plot thickens..
 > 
 > Hm, that's the WARN_ON that comes from a failed pagecache invalidation
 > prior to a dio operation, which implies that something's mixing buffered
 > and dio?

Plausible. Judging by RAX, we got -EBUSY

 > Given that it's syzkaller it wouldn't surprise me to hear that it's
 > doing that... :)

s/syzkaller/trinity/, but yes.

	Dave

Thread

Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-08-28 22:40 +0200
  Re: iov_iter_pipe warning. "Darrick J. Wong" <darrick.wong@oracle.com> - 2017-08-29 06:30 +0200
    Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-08-30 19:10 +0200
      Re: iov_iter_pipe warning. "Darrick J. Wong" <darrick.wong@oracle.com> - 2017-08-30 19:20 +0200
        Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-08-30 19:20 +0200
    Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-09-06 22:10 +0200
      Re: iov_iter_pipe warning. Dave Chinner <david@fromorbit.com> - 2017-09-07 01:50 +0200
        Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-09-07 05:50 +0200
          Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-09-07 06:40 +0200
        Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-09-08 03:10 +0200
          Re: iov_iter_pipe warning. Dave Jones <davej@codemonkey.org.uk> - 2017-09-10 03:10 +0200
            Re: iov_iter_pipe warning. Al Viro <viro@ZenIV.linux.org.uk> - 2017-09-10 05:00 +0200

csiph-web