Kernel Oops on hot insertion of USB

Kernel Oops on hot insertion of USB

[Rachmel, Nir (Nir)]

Hi,

	I am running linux kernel version 2.6.14.7, and have a problem
when
	inserting / removing a disk-on-key device from my system: I get
a
	"kernel oops". Using some debugging tools I managed to trace the
	problem down to an event of "double free" that occurs within the
hot
	insertion module.
	
	googling didn't help much. Is this a known issue which is
resolved in
	later kernel versions?
	
	
Thanks in advance,

- Nir.

Re: Kernel Oops on hot insertion of USB

[Bart Van Assche]

On Thu, Apr 10, 2008 at 3:06 PM, Rachmel, Nir (Nir) <rachmel@avaya.com> wrote:
> I am running linux kernel version 2.6.14.7, and have a problem
> when inserting / removing a disk-on-key device from my system: I get
> a "kernel oops". Using some debugging tools I managed to trace the
> problem down to an event of "double free" that occurs within the
> hot insertion module.
>
> googling didn't help much. Is this a known issue which is resolved in
> later kernel versions?

Can you try yourself whether the kernel oops still occurs with a more
recent kernel, e.g. 2.6.24.4 ? If you can reproduce this with a recent
kernel, the change is much higher that someone will look at this issue
than for kernel 2.6.14.7.

Bart.

Re: Kernel Oops on hot insertion of USB

[Greg KH]

On Thu, Apr 10, 2008 at 03:06:05PM +0200, Rachmel, Nir (Nir) wrote:
> Hi,
> 
> 	I am running linux kernel version 2.6.14.7, and have a problem
> when
> 	inserting / removing a disk-on-key device from my system: I get
> a
> 	"kernel oops". Using some debugging tools I managed to trace the
> 	problem down to an event of "double free" that occurs within the
> hot
> 	insertion module.
> 	
> 	googling didn't help much. Is this a known issue which is
> resolved in
> 	later kernel versions?

Yes it is, please upgrade :)

thanks,

greg k-h

Re: Kernel Oops on hot insertion of USB

[Greg KH]

A: No.
Q: Should I include quotations after my reply?

On Sat, Apr 12, 2008 at 11:20:08AM +0200, Rachmel, Nir (Nir) wrote:
> Hi greg,
>  
> Thanks for your reply. I am aware that I am "a bit" far behind in the
> Linux revsions tree,

Just a "bit", if you consider almost 3 years and many hundreds of
thousands of changes a "bit" :)

> however it will be very difficult for me to upgrade.

Why?  Userspace should work just fine.  If you are relying on custom
kernel modules, well, I think you now know the reason the kernel
developers are saying for people to get their code upstream to prevent
this kind of issue...

> I have done much work and testing with 2.6.14.7 and would
> prefer to patch it over upgrading it to the current version.

Hopefully you are able to patch all of the bugs and security issues that
have been found in the past 3 years.

> Was this problem fixed in a specific revision, or was the fix
> introduced due to several fixes in different areas? Maybe I can look
> at the specific fix and implement it on my own version.

All of our changes are public, I would suggest going through them and
trying to find it.  Because you are relying on such an old, outdated,
and unsupported kernel version, you really are on your own.

good luck,

greg k-h

Re: Kernel Oops on hot insertion of USB

[Yinghai Lu]

On Sat, Apr 12, 2008 at 9:59 AM, Greg KH <greg@kroah.com> wrote:
> A: No.
>  Q: Should I include quotations after my reply?
>
>  On Sat, Apr 12, 2008 at 11:20:08AM +0200, Rachmel, Nir (Nir) wrote:
>  > Hi greg,
>  >
>  > Thanks for your reply. I am aware that I am "a bit" far behind in the
>  > Linux revsions tree,
>
>  Just a "bit", if you consider almost 3 years and many hundreds of
>  thousands of changes a "bit" :)
>
>  > however it will be very difficult for me to upgrade.
>
>  Why?  Userspace should work just fine.  If you are relying on custom
>  kernel modules, well, I think you now know the reason the kernel
>  developers are saying for people to get their code upstream to prevent
>  this kind of issue...
>
>  > I have done much work and testing with 2.6.14.7 and would
>  > prefer to patch it over upgrading it to the current version.
>
>  Hopefully you are able to patch all of the bugs and security issues that
>  have been found in the past 3 years.

should be typo. Is there any 2.6.14.7 ?, it could be 2.6.24.7

YH

Re: Kernel Oops on hot insertion of USB

[Simon Holm Thøgersen]

lør, 12 04 2008 kl. 12:08 -0700, skrev Yinghai Lu:
> On Sat, Apr 12, 2008 at 9:59 AM, Greg KH <greg@kroah.com> wrote:
> >  > I have done much work and testing with 2.6.14.7 and would
> >  > prefer to patch it over upgrading it to the current version.
> >
> >  Hopefully you are able to patch all of the bugs and security issues that
> >  have been found in the past 3 years.
> 
> should be typo. Is there any 2.6.14.7 ?, it could be 2.6.24.7
> 
Yes, there is a 2.6.14.7, see the ChangeLog at
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14.7


Simon Holm Thøgersen