[2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive.

[2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive.

[Shaun Ruffell]

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.

Re: [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive.

[Maciej Rutecki]

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.
> --
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-- 
Maciej Rutecki
http://www.maciek.unixy.pl

Re: [2.6.39-rc2][bisected] Constant DISK_MEDIA_CHANGE_EVENTS from CDROM drive.

[Jens Axboe]

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