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From: Sebastian Roesner <sroesner-kernelorg@roesner-online.de>
To: Ming Lei <ming.lei@canonical.com>,
	Eric Wheeler <bcache@lists.ewheeler.net>
Cc: linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org,
	Ming Lin <mlin@kernel.org>, Vlad-Cosmin Miu <miuvlad@gmail.com>,
	rjones@redhat.com, Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: [BUG] NULL pointer in raid1_make_request passed to bio_trim when adding md as bcache caching dev
Date: Sat, 26 Mar 2016 17:46:16 +0100	[thread overview]
Message-ID: <56F6BCD8.70504@roesner-online.de> (raw)
In-Reply-To: <CACVXFVO7ARehcQHvBuRoVHZhc0BgA5kKxaPQTqMT7Y=4Ca6urw@mail.gmail.com>

Hello Ming, Eric,

Am 26.03.2016 um 16:40 schrieb Ming Lei:
>  From the trace, looks the bio returned from bio_clone_mddev() is NULL,
> and maybe the source bio is buggy, something like the attached patch
> might be helpful, could you apply the attached debug patch, reproduce
> and post the log?

I was able to reproduce it on a non-productive system, but only after 
copying the bcache superblocks/partition starts from the original 
system, with new created ones it worked fine.

Full trace and check_bio output can be found here:

http://pastebin.com/ngvGGHBZ

Sebastian

  reply	other threads:[~2016-03-26 16:46 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-24 15:19 Bug - bcache: "unable to handle kernel NULL pointer dereference" when trying to add a md caching device Sebastian Roesner
2016-03-25  1:49 ` Eric Wheeler
2016-03-25  4:18   ` Eric Wheeler
2016-03-25 14:11     ` Sebastian Roesner
2016-03-25 20:44       ` [BUG] NULL pointer in raid1_make_request passed to bio_trim when adding md as bcache caching dev Eric Wheeler
2016-03-25 21:32         ` Eric Wheeler
2016-03-26 18:38           ` Sebastian Roesner
2016-03-26 15:40         ` Ming Lei
2016-03-26 16:46           ` Sebastian Roesner [this message]
2016-03-28 18:10             ` Shaohua Li
2016-03-28 18:38               ` Jeff Moyer
2016-03-29  1:28               ` Ming Lei
2016-04-01 18:14               ` Eric Wheeler
2016-04-10 18:01                 ` Sebastian Roesner

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