linux-kernel - Re: NULL deref around blkmq in v4.0-rc1

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Message-ID: <alpine.LSU.2.20.1504092352140.14912@nerf40.vanv.qr>
Date:	Fri, 10 Apr 2015 00:29:02 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: NULL deref around blkmq in v4.0-rc1–rc7


On Thursday 2015-04-09 23:12, Linus Torvalds wrote:
>That ->sense_buffer thing is supposed to be initialized by the
>blk_mq_ops.init_request() function, which is called - if it exists =
>when the array of requests ('->rqs[]') is initialized.
>[...]
>Does this entirely untested patch make any difference?

Yes, this seems to solve it for me.


>Anyway, I assume that the actual "disk" in question is mpt fusion?

I had two setups, one non-virtual AHCI, and one emulated mpt,
both of which had failed and are now fixed for what I can tell.
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