Request backport of 'ipv6: addrconf: fix dev refcont leak when DAD failed ' to linux-4.4.y

Request backport of 'ipv6: addrconf: fix dev refcont leak when DAD failed ' to linux-4.4.y

[Steven Schlansker]

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Hi linux-stable,

This is a request to backport

751eb6b6 ipv6: addrconf: fix dev refcont leak when DAD failed
https://github.com/torvalds/linux/commit/751eb6b6042a596b0080967c1a529a9fe98dac1d

to linux-stable 4.4.y branch.
It has already been applied to stable master, and 4.7.y, but not longterm 4.4.y

We often (1+/week) run into hosts hanging with errors like

[1637669.684652] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1
[1637679.864366] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1

and have been told that this patch likely fixes the problem.

I am not on the list so please keep me on CC for any followup.

Thanks!
Steven


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Re: Request backport of 'ipv6: addrconf: fix dev refcont leak when DAD failed ' to linux-4.4.y

[Greg KH]

On Mon, Oct 03, 2016 at 07:27:35PM +0000, Steven Schlansker wrote:
> Hi linux-stable,
> 
> This is a request to backport
> 
> 751eb6b6 ipv6: addrconf: fix dev refcont leak when DAD failed
> https://github.com/torvalds/linux/commit/751eb6b6042a596b0080967c1a529a9fe98dac1d
> 
> to linux-stable 4.4.y branch.
> It has already been applied to stable master, and 4.7.y, but not longterm 4.4.y
> 
> We often (1+/week) run into hosts hanging with errors like
> 
> [1637669.684652] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1
> [1637679.864366] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1
> 
> and have been told that this patch likely fixes the problem.

It's already in the 4.4.22 stable release, are you not already using
that release?

confused,

greg k-h

Re: Request backport of 'ipv6: addrconf: fix dev refcont leak when DAD failed ' to linux-4.4.y

[Steven Schlansker]

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On Oct 4, 2016, at 12:18 AM, Greg KH <greg@kroah.com> wrote:
> 
> On Mon, Oct 03, 2016 at 07:27:35PM +0000, Steven Schlansker wrote:
>> Hi linux-stable,
>> 
>> This is a request to backport
>> 
>> 751eb6b6 ipv6: addrconf: fix dev refcont leak when DAD failed
>> https://github.com/torvalds/linux/commit/751eb6b6042a596b0080967c1a529a9fe98dac1d
>> 
>> to linux-stable 4.4.y branch.
>> It has already been applied to stable master, and 4.7.y, but not longterm 4.4.y
>> 
>> We often (1+/week) run into hosts hanging with errors like
>> 
>> [1637669.684652] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1
>> [1637679.864366] unregister_netdevice: waiting for veth26dc718 to become free. Usage count = 1
>> 
>> and have been told that this patch likely fixes the problem.
> 
> It's already in the 4.4.22 stable release, are you not already using
> that release?
> 
> confused,

No, I am the one that is confused, I somehow managed to miss it in the history --
I think I misspelled 'refcont' as 'refcount' when searching, or something like that.

I see it now.  Thanks for pointing this out, sorry for the noise!


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