Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0

From	Dave Chinner <david@fromorbit.com>
Newsgroups	linux.kernel
Subject	Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0
Date	2016-12-22 23:20 +0100
Message-ID	<sRjSp-6Nc-3@gated-at.bofh.it> (permalink)
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On Thu, Dec 22, 2016 at 01:10:19PM -0800, Linus Torvalds wrote:
> Ok, so the numa issue was a red herring. With that fixed:
> 
> On Thu, Dec 22, 2016 at 1:06 PM, Dave Chinner <david@fromorbit.com> wrote:
> >
> > Better, but still bad. average files/s is not up to 200k files/s,
> > so still a good 10-15% off where it should be. xfs_repair is back
> > down to 10-15% off where it should be, too. bulkstat still fires off
> > a bad page reference count warning, iscsi still panics immediately.
> 
> Do you have CONFIG_BLK_WBT enabled, perhaps?

Ok, yes, that's enabled. Let me go turn it off and see what happens.

> It's new to this merge window, and I'm not convinced it's been tuned.
> Particularly for your kinds of fairly extreme IO loads.

Well, these aren't extreme IO workloads. Yes, the filesystem does a
lot of work on the CPU, but the IO loads XFS generates aren't
particularly high - maybe 2-3000 IOPS at most, and mostly the
bandwidth is below 100MB/s.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

Thread

[4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-14 23:30 +0100
  Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-14 23:40 +0100
    Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Chris Leech <cleech@redhat.com> - 2016-12-16 20:00 +0100
      Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-21 23:30 +0100
        Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-22 00:30 +0100
          Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Chris Leech <cleech@redhat.com> - 2016-12-22 01:20 +0100
            Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 06:20 +0100
              Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-22 06:50 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 08:00 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Chris Leech <cleech@redhat.com> - 2016-12-22 20:00 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Ming Lei <tom.leiming@gmail.com> - 2016-12-23 01:00 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Chris Leech <cleech@redhat.com> - 2016-12-23 01:10 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-23 11:10 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-23 20:50 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-24 10:50 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-24 11:10 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-24 14:20 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Hannes Reinecke <hare@suse.de> - 2016-12-24 14:20 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Hugh Dickins <hughd@google.com> - 2016-12-22 21:30 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Johannes Weiner <hannes@cmpxchg.org> - 2016-12-23 08:40 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Johannes Weiner <hannes@cmpxchg.org> - 2016-12-23 09:40 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Johannes Weiner <hannes@cmpxchg.org> - 2017-01-02 22:20 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Jan Kara <jack@suse.cz> - 2017-01-03 13:30 +0100
              Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 07:30 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-22 18:30 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Thomas Gleixner <tglx@linutronix.de> - 2016-12-22 21:30 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 21:50 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 22:10 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-22 22:20 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 23:20 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 23:40 +0100
                Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-23 05:00 +0100
          Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-22 07:20 +0100
            Re: [4.10, panic, regression] iscsi: null pointer deref at  iscsi_tcp_segment_done+0x20d/0x2e0 Dave Chinner <david@fromorbit.com> - 2016-12-22 07:40 +0100
              Re: [4.10, panic, regression] iscsi: null pointer deref at         iscsi_tcp_segment_done+0x20d/0x2e0 Christoph Hellwig <hch@lst.de> - 2016-12-22 07:40 +0100

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