linux-kernel - Re: [BUG] kernel BUG at /.../block/cfq-iosched.c:3145!

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Message-ID: <5346158B.90005@fb.com>
Date:	Wed, 9 Apr 2014 21:52:43 -0600
From:	Jens Axboe <axboe@...com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Jan Kara <jack@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Brian J King <bjking1@...ibm.com>
Subject: Re: [BUG] kernel BUG at /.../block/cfq-iosched.c:3145!

On 2014-04-09 21:35, Benjamin Herrenschmidt wrote:
> On Wed, 2014-04-09 at 20:25 -0600, Jens Axboe wrote:
>> On 2014-04-09 19:36, Benjamin Herrenschmidt wrote:
>>> On Wed, 2014-04-09 at 19:31 -0600, Jens Axboe wrote:
>>>> OK, I think we're seeing different symptoms of the same bug. Stay
>>>> tuned, will have something for you to test shortly, I hope.
>>>
>>> Ah thanks. I'll defer the bisection then (it's painful on that machine
>>> for various reasons....)
>>
>> Can you try with these two patches applied?
>
> Booted to login prompt once ... and twice. Much better ! :-)

Excellent! I was hoping it was the same bug :-)
I'll amend the commit and add your tested-by.

> Not sure if it's related, but in the "good" boots (with the patch),
> I see a truckload of:
>
> systemd-udevd[3264]: starting version 204
> sr 2:6:0:0: [sr0]
> Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> sr 2:6:0:0: [sr0]
> Sense Key : Illegal Request [current]
> sr 2:6:0:0: [sr0]
> Add. Sense: Logical block address out of range
> sr 2:6:0:0: [sr0] CDB:
> Read(10): 28 00 00 00 00 00 00 00 01 00
> end_request: critical target error, dev sr0, sector 0
> Buffer I/O error on device sr0, logical block 0
> [  OK  ] Started udev Kernel Device Manager.
> sr 2:6:0:0: [sr0]
> Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> sr 2:6:0:0: [sr0]
> Sense Key : Illegal Request [current]
> sr 2:6:0:0: [sr0]
> Add. Sense: Logical block address out of range
> sr 2:6:0:0: [sr0] CDB:
>
>     etc...
>
> I might have a crap coaster in that drive. It doesn't prevent
> the machine from working otherwise, so far...

That does look like just a dud cdrom in the tray.

-- 
Jens Axboe

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