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

From	Chris Leech <cleech@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0
Date	2016-12-23 01:10 +0100
Message-ID	<sRlAS-7Xi-43@gated-at.bofh.it> (permalink)
References	(5 earlier) <sR3Xj-51C-3@gated-at.bofh.it> <sR4qm-5dV-27@gated-at.bofh.it> <sR5w5-5Rl-5@gated-at.bofh.it> <sRgKR-4Er-11@gated-at.bofh.it> <sRlrb-7DS-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Dec 23, 2016 at 07:53:50AM +0800, Ming Lei wrote:
> On Fri, Dec 23, 2016 at 2:50 AM, Chris Leech <cleech@redhat.com> wrote:
> > I'm not reproducing any problems with xfstests running over iscsi_tcp
> > right now.  Two 10G luns exported from an LIO target, attached directly
> > to a test VM as sda/sdb and xfstests configured to use sda1/sdb1 as
> > TEST_DEV and SCRATCH_DEV.
> >
> > The virtio scatterlist issue that popped right away for me is triggered
> > by an hdparm ioctl, which is being run by tuned on Fedora.  And that
> > actually seems to happen back on 4.9 as well :(
> 
> Could you share us what the specific hdparm cmd line is? I tried several
> random cmds over virtio-blk/virito-scsi, looks not see this problem.

Of course, looks like I've screwed up my bisect run on this so I'm still
taking a look.  It triggers for me with 'hdparm -B /dev/vda' but may
also depend on kernel configuration.

I started with the fedora rawhide config with a lot of debug on and
trimed it down with a localmodconfig run in the VM to speed up rebuilds.

Chris

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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