From: Jens Axboe <jaxboe@fusionio.com>
To: "maciej.rutecki@gmail.com" <maciej.rutecki@gmail.com>
Cc: Shaun Ruffell <sruffell@digium.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Tejun Heo <tj@kernel.org>
Subject: Re: [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive.
Date: Sat, 16 Apr 2011 20:25:25 +0200 [thread overview]
Message-ID: <4DA9DF15.80603@fusionio.com> (raw)
In-Reply-To: <201104151913.38841.maciej.rutecki@gmail.com>
On 2011-04-15 19:13, Maciej Rutecki wrote:
> I created a Bugzilla entry at
> https://bugzilla.kernel.org/show_bug.cgi?id=33342
> for your bug report, please add your address to the CC list in there, thanks!
>
> On piątek, 8 kwietnia 2011 o 22:15:13 Shaun Ruffell wrote:
>> Running with 2.6.39-rc2 on a CentOS 5.5 installation with a "IDE interface:
>> Intel Corporation 82801CA Ultra ATA Storage Controller (rev 02)"
>> (8086:248b), I've noticed constant DISK_MEDIA_CHANGE uevents. In my
>> kernel log:
>>
>> [ 1107.530699] kobject: 'hda' (f5372610): fill_kobj_path: path =
>> '/block/hda' [ 1109.580559] kobject: 'hda' (f5372610): kobject_uevent_env
>> [ 1109.580594] kobject: 'hda' (f5372610): fill_kobj_path: path =
>> '/block/hda' [ 1111.630560] kobject: 'hda' (f5372610): kobject_uevent_env
>> [ 1111.630595] kobject: 'hda' (f5372610): fill_kobj_path: path =
>> '/block/hda' [ 1113.680560] kobject: 'hda' (f5372610): kobject_uevent_env
>>
>> And from udevmonitor --env:
>>
>> UEVENT[1302291995.789487] change@/block/hda
>> ACTION=change
>> DEVPATH=/block/hda
>> SUBSYSTEM=block
>> DISK_MEDIA_CHANGE=1
>> MAJOR=3
>> MINOR=0
>> DEVNAME=hda
>> DEVTYPE=disk
>> SEQNUM=1318
>>
>> I bisected it down to 929e27252e8ca69363f81f26af5eaba62cb4c572 'ide:
>> ide_requeue_and_plug() reinstate "always plug" behaviour'
>>
>> I haven't yet looked into how that change would result in the change in
>> behavior I'm seeing but I thought I would let you know sooner rather than
>> leter in case this is something that is already known.
Tejun, why would something like that trigger and endless stream of media
change events? I bet this is what is cauing ide-cd to hang the system as
well now. What I know:
- It only triggers on UP
- And then it only triggers when PREEMPT is completely turned off
--
Jens Axboe
prev parent reply other threads:[~2011-04-16 18:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-08 20:15 [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive Shaun Ruffell
2011-04-15 17:13 ` Maciej Rutecki
2011-04-16 18:25 ` Jens Axboe [this message]
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