linux-kernel - Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment

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Date:   Thu, 22 Dec 2016 13:10:19 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Dave Chinner <david@...morbit.com>, Jens Axboe <axboe@...com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Peter Anvin <hpa@...or.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0

Ok, so the numa issue was a red herring. With that fixed:

On Thu, Dec 22, 2016 at 1:06 PM, Dave Chinner <david@...morbit.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?

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.

              Linus