linux-kernel - Re: Glibc recvmsg from kernel netlink socket hangs forever

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Date:	Fri, 11 Mar 2016 16:13:59 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jun Wang <junwang123@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: Glibc recvmsg from kernel netlink socket hangs forever

On Fri, Mar 11, 2016 at 3:50 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Fri, Mar 11, 2016 at 11:33:17AM -0800, Jun Wang wrote:
>> Guenter,
>>
>> Which additional netlink changes from 4.2 did you patch? We still see
>> the problem with your test program with 4.1.12 which have the
>> following two patches mentioned by Herbert Xu on this thread.
>>
> Jun,
>
> Sorry, I don't recall, and I no longer have access to the kernel since
> I now work for a different company. I do recall that we had to apply
> additional patches later, but I don't remember details.

I think it is probably this one:

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/net/netlink/af_netlink.c?h=linux-4.1.y&id=a52ec6de6d1638e8c203d7188c55627f75371612

The original backport is incorrect in 4.1 branch, and it is fixed now.