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From: Changheun Lee <nanich.lee@samsung.com>
To: bvanassche@acm.org
Cc: axboe@kernel.dk, bgoncalv@redhat.com, hch@lst.de,
	jaegeuk@kernel.org, linux-block@vger.kernel.org,
	ming.lei@redhat.com, nanich.lee@samsung.com, yi.zhang@redhat.com
Subject: Re: [PATCH v2] block: Improve limiting the bio size
Date: Thu, 29 Apr 2021 15:39:01 +0900	[thread overview]
Message-ID: <20210429063901.9593-1-nanich.lee@samsung.com> (raw)
In-Reply-To: <a1759842-eb14-e477-fdf6-b6844e5aa29f@acm.org>

> On 4/28/21 12:21 AM, Changheun Lee wrote:
> > Actually I don't know why NULL pointer dereference is occurred with Bart's
> > patch in blk_rq_map_kern(). And same problem have not occured yet in my
> > test environment with Bart's patch.
> > Maybe I missed something, or missunderstood?
> 
> The call trace that I shared on the linux-block mailing list was
> encountered inside a VM that has a SATA disk attached to it and also a
> SATA CD-ROM. Does replicating that setup allow to reproduce the NULL
> pointer dereference that I reported?
> 
> Bart.

I can reproduce and see NULL pointer dereference in same call path without
your patch. But I can't reproduced it with your patch.
I tested in ubuntu via grub. SATA disk is attached only in my environment.
Actually I didn't test in VM yet. I'll try.

Thanks,

Changheun.

  reply	other threads:[~2021-04-29  6:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-25  4:30 [PATCH v2] block: Improve limiting the bio size Bart Van Assche
2021-04-25  7:36 ` Yi Zhang
2021-04-25 16:19 ` Jens Axboe
2021-04-26  6:32   ` Yi Zhang
2021-04-26  8:34     ` Changheun Lee
2021-04-26 16:17       ` Bart Van Assche
2021-04-27  0:28         ` Changheun Lee
2021-04-27  2:46           ` Bart Van Assche
2021-04-27  4:12             ` Changheun Lee
2021-04-27 14:59               ` Bart Van Assche
2021-04-28  7:21                 ` Changheun Lee
2021-04-28 15:52                   ` Bart Van Assche
2021-04-29  6:39                     ` Changheun Lee [this message]
2021-05-03  9:28                       ` Changheun Lee
2021-05-03 16:35                         ` Bart Van Assche
2021-04-26 12:54     ` Jens Axboe
2021-04-26 23:43       ` Changheun Lee

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