Udev infinite loop

Udev infinite loop

[Guillaume Chazarain]

Hi,

I've encountered a small problem with udev.
If I mount my ZIP drive with a bad option it goes
in an infinite loop and every ~0.5 second the udev
daemon wakes up and my ZIP starts spinning.

I run fedora core 3 test1 with linux-2.6.8-rc4, udev-026.
So I don't use actually use udev but it's running.

If I do :

mount /dev/hdd4 /mnt/zip -o unknown_option=unknown_value

mount will complain about the option, refuse to mount, and
the infinite loop will start.

I am sorry for the lack of details, but I am not currently at home.
If you cannot reproduce it, please ask me any details you need.

Thanks.

-- 
Guillaume



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Re: Udev infinite loop

[Greg KH]

On Fri, Aug 13, 2004 at 12:57:27PM +0200, Guillaume Chazarain wrote:
> Hi,
> 
> I've encountered a small problem with udev.
> If I mount my ZIP drive with a bad option it goes
> in an infinite loop and every ~0.5 second the udev
> daemon wakes up and my ZIP starts spinning.
> 
> I run fedora core 3 test1 with linux-2.6.8-rc4, udev-026.
> So I don't use actually use udev but it's running.
> 
> If I do :
> 
> mount /dev/hdd4 /mnt/zip -o unknown_option=unknown_value
> 
> mount will complain about the option, refuse to mount, and
> the infinite loop will start.
> 
> I am sorry for the lack of details, but I am not currently at home.
> If you cannot reproduce it, please ask me any details you need.

I need more details.  Kernel log messages.  udev log messages. something
more...

Oh, and how about upgrading to the latest version of udev, we're at 030
these days.

thanks,

greg k-h


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Re: Udev infinite loop

[Guillaume Chazarain]

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Greg KH wrote:

>On Fri, Aug 13, 2004 at 12:57:27PM +0200, Guillaume Chazarain wrote:
>  
>
>>Hi,
>>
>>I've encountered a small problem with udev.
>>If I mount my ZIP drive with a bad option it goes
>>in an infinite loop and every ~0.5 second the udev
>>daemon wakes up and my ZIP starts spinning.
>>
>>I run fedora core 3 test1 with linux-2.6.8-rc4, udev-026.
>>So I don't use actually use udev but it's running.
>>
>>If I do :
>>
>>mount /dev/hdd4 /mnt/zip -o unknown_option=unknown_value
>>
>>mount will complain about the option, refuse to mount, and
>>the infinite loop will start.
>>
>>I am sorry for the lack of details, but I am not currently at home.
>>If you cannot reproduce it, please ask me any details you need.
>>    
>>
>
>I need more details.  Kernel log messages.  udev log messages. something
>more...
>
>  
>
That's bad news, it means you cannot reproduce it :(
Here is a tar.bz2 containing strace logs of dbus-daemon-1 and udevd. 
There is also a dmesg
output, my kernel .config, /etc/udev /sys and kernel logs.
I see nothing wrong in them, but hopefully you will.

>Oh, and how about upgrading to the latest version of udev, we're at 030
>these days.
>
>  
>
OK, done.

-- 
Guillaume


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Re: Udev infinite loop

[David Zeuthen]

On Mon, 2004-08-16 at 10:12 +0200, Guillaume Chazarain wrote:
> That's bad news, it means you cannot reproduce it :(
> Here is a tar.bz2 containing strace logs of dbus-daemon-1 and udevd.
> There is also a dmesg
> output, my kernel .config, /etc/udev /sys and kernel logs.
> I see nothing wrong in them, but hopefully you will.
> 

This is not an udev problem; this is caused by the fact that hal polls
your device for media; fwiw, I've seen this with the ide-cs driver as
well when using a PCMCIA CF card reader and I'm looking into
blacklisting such devices or at least working around issues. Please
state your version of hal and include the output of 'lshal' so we can
get this resolved.

To me, it seems that if you do a 'dd if=/dev/hde of=/tmp/foo bsQ2
count\x10' then it causes a all partitions on /dev/hde to be hot
unplugged and then hot replugged. Uhm, isn't that some kind of bug in
the driver or what.

thanks,
David




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Re: Udev infinite loop

[David Zeuthen]

On Mon, 2004-08-16 at 10:43 +0200, David Zeuthen wrote:
> On Mon, 2004-08-16 at 10:12 +0200, Guillaume Chazarain wrote:
> > That's bad news, it means you cannot reproduce it :(
> > Here is a tar.bz2 containing strace logs of dbus-daemon-1 and udevd.
> > There is also a dmesg
> > output, my kernel .config, /etc/udev /sys and kernel logs.
> > I see nothing wrong in them, but hopefully you will.
> > 

Guillaume: I believe I've fixed this problem in the just released hal
0.2.97, at least it works nicely with my PCMCIA card reader which showed
the same issues. I see that you are running Fedora Core development;
updated hal-0.2.97 packages should appear in rawhide soon [1].

It would be great if you can test these packages ('rpm -q hal' should
report hal-0.2.97-1 or higher) and if it fails then please report the
bug to http://bugzilla.redhat.com or the hal@freedesktop.org mailing
list. If it just works, also feel free to mail me personally; I would
appreciate it! Thanks.

> This is not an udev problem; this is caused by the fact that hal polls
> your device for media; fwiw, I've seen this with the ide-cs driver as
> well when using a PCMCIA CF card reader and I'm looking into
> blacklisting such devices or at least working around issues. Please
> state your version of hal and include the output of 'lshal' so we can
> get this resolved.
> 
> To me, it seems that if you do a 'dd if=/dev/hde of=/tmp/foo bsQ2
> count\x10' then it causes a all partitions on /dev/hde to be hot
> unplugged and then hot replugged. Uhm, isn't that some kind of bug in
> the driver or what.

Hotplug folks: I'd just like to note that this problem is not exclusive
to hal at all, it even applies to mount(1) if the filesystem given is
'auto', cause then mount(1) access the device file and this will cause a
hotplug removal and then a hotplug add. Specifically, using udev
callouts to get the drive serial number or volume lanel will also cause
infinite loops.

Can anyone please confirm this is a bug in the IDE subsystem?

Thanks,
David

[1] : Alternatively download the (S)RPMs from here
      http://freedesktop.org/~david/rpms/



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Re: Udev infinite loop

[Guillaume Chazarain]

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David Zeuthen wrote:

>On Mon, 2004-08-16 at 10:43 +0200, David Zeuthen wrote:
>  
>
>>On Mon, 2004-08-16 at 10:12 +0200, Guillaume Chazarain wrote:
>>    
>>
>>>That's bad news, it means you cannot reproduce it :(
>>>Here is a tar.bz2 containing strace logs of dbus-daemon-1 and udevd.
>>>There is also a dmesg
>>>output, my kernel .config, /etc/udev /sys and kernel logs.
>>>I see nothing wrong in them, but hopefully you will.
>>>
>>>      
>>>
>
>Guillaume: I believe I've fixed this problem in the just released hal
>0.2.97, at least it works nicely with my PCMCIA card reader which showed
>the same issues. I see that you are running Fedora Core development;
>updated hal-0.2.97 packages should appear in rawhide soon [1].
>
>It would be great if you can test these packages ('rpm -q hal' should
>report hal-0.2.97-1 or higher) and if it fails then please report the
>bug to http://bugzilla.redhat.com or the hal@freedesktop.org mailing
>list. If it just works, also feel free to mail me personally; I would
>appreciate it! Thanks.
>  
>
Sorry for the delay, I am at work, here are two lshal outputs, one 
before mounting
and the other after.

Hopefully tomorrow you'll know if the new hal solves my problems :)

-- 
Guillaume


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