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Message-ID: <1550250855.31902.102.camel@acm.org>
Subject: Re: [dm-devel] [PATCH V15 00/18] block: support multi-page bvec
From:   Bart Van Assche <bvanassche@acm.org>
To:     Jens Axboe <axboe@kernel.dk>, Ming Lei <ming.lei@redhat.com>
Cc:     Mike Snitzer <snitzer@redhat.com>, linux-mm@kvack.org,
        dm-devel@redhat.com, Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        "Darrick J . Wong" <darrick.wong@oracle.com>,
        Omar Sandoval <osandov@fb.com>, cluster-devel@redhat.com,
        linux-ext4@vger.kernel.org,
        Kent Overstreet <kent.overstreet@gmail.com>,
        Boaz Harrosh <ooo@electrozaur.com>,
        Gao Xiang <gaoxiang25@huawei.com>, Coly Li <colyli@suse.de>,
        linux-raid@vger.kernel.org, Bob Peterson <rpeterso@redhat.com>,
        linux-bcache@vger.kernel.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Dave Chinner <dchinner@redhat.com>,
        David Sterba <dsterba@suse.com>, linux-block@vger.kernel.org,
        Theodore Ts'o <tytso@mit.edu>, linux-kernel@vger.kernel.org,
        linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-btrfs@vger.kernel.org
Date:   Fri, 15 Feb 2019 09:14:15 -0800
In-Reply-To: <c52b6a8b-d1d4-67ff-f81c-371d09cc6d5b@kernel.dk>
References: <20190215111324.30129-1-ming.lei@redhat.com>
         <c52b6a8b-d1d4-67ff-f81c-371d09cc6d5b@kernel.dk>
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On Fri, 2019-02-15 at 08:49 -0700, Jens Axboe wrote:
+AD4 On 2/15/19 4:13 AM, Ming Lei wrote:
+AD4 +AD4 This patchset brings multi-page bvec into block layer:
+AD4 
+AD4 Applied, thanks Ming. Let's hope it sticks+ACE

Hi Jens and Ming,

Test nvmeof-mp/002 fails with Jens' for-next branch from this morning.
I have not yet tried to figure out which patch introduced the failure.
Anyway, this is what I see in the kernel log for test nvmeof-mp/002:

+AFs  475.611363+AF0 BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
+AFs  475.621188+AF0 +ACM-PF error: +AFs-normal kernel read fault+AF0
+AFs  475.623148+AF0 PGD 0 P4D 0  
+AFs  475.624737+AF0 Oops: 0000 +AFsAIw-1+AF0 PREEMPT SMP KASAN
+AFs  475.626628+AF0 CPU: 1 PID: 277 Comm: kworker/1:1H Tainted: G    B             5.0.0-rc6-dbg+- +ACM-1
+AFs  475.630232+AF0 Hardware name: QEMU Standard PC (i440FX +- PIIX, 1996), BIOS 1.10.2-1 04/01/2014
+AFs  475.633855+AF0 Workqueue: kblockd blk+AF8-mq+AF8-requeue+AF8-work
+AFs  475.635777+AF0 RIP: 0010:+AF8AXw-blk+AF8-recalc+AF8-rq+AF8-segments+-0xbe/0x590
+AFs  475.670948+AF0 Call Trace:
+AFs  475.693515+AF0  blk+AF8-recalc+AF8-rq+AF8-segments+-0x2f/0x50
+AFs  475.695081+AF0  blk+AF8-insert+AF8-cloned+AF8-request+-0xbb/0x1c0
+AFs  475.701142+AF0  dm+AF8-mq+AF8-queue+AF8-rq+-0x3d1/0x770
+AFs  475.707225+AF0  blk+AF8-mq+AF8-dispatch+AF8-rq+AF8-list+-0x5fc/0xb10
+AFs  475.717137+AF0  blk+AF8-mq+AF8-sched+AF8-dispatch+AF8-requests+-0x256/0x300
+AFs  475.721767+AF0  +AF8AXw-blk+AF8-mq+AF8-run+AF8-hw+AF8-queue+-0xd6/0x180
+AFs  475.725920+AF0  +AF8AXw-blk+AF8-mq+AF8-delay+AF8-run+AF8-hw+AF8-queue+-0x25c/0x290
+AFs  475.727480+AF0  blk+AF8-mq+AF8-run+AF8-hw+AF8-queue+-0x119/0x1b0
+AFs  475.732019+AF0  blk+AF8-mq+AF8-run+AF8-hw+AF8-queues+-0x7b/0xa0
+AFs  475.733468+AF0  blk+AF8-mq+AF8-requeue+AF8-work+-0x2cb/0x300
+AFs  475.736473+AF0  process+AF8-one+AF8-work+-0x4f1/0xa40
+AFs  475.739424+AF0  worker+AF8-thread+-0x67/0x5b0
+AFs  475.741751+AF0  kthread+-0x1cf/0x1f0
+AFs  475.746034+AF0  ret+AF8-from+AF8-fork+-0x24/0x30

(gdb) list +ACo(+AF8AXw-blk+AF8-recalc+AF8-rq+AF8-segments+-0xbe)
0xffffffff816a152e is in +AF8AXw-blk+AF8-recalc+AF8-rq+AF8-segments (block/blk-merge.c:366).
361                                                  struct bio +ACo-bio)
362     +AHs
363             struct bio+AF8-vec bv, bvprv +AD0 +AHs NULL +AH0AOw
364             int prev +AD0 0+ADs
365             unsigned int seg+AF8-size, nr+AF8-phys+AF8-segs+ADs
366             unsigned front+AF8-seg+AF8-size +AD0 bio-+AD4-bi+AF8-seg+AF8-front+AF8-size+ADs
367             struct bio +ACo-fbio, +ACo-bbio+ADs
368             struct bvec+AF8-iter iter+ADs
369
370             if (+ACE-bio)

Bart.