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

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Message-ID: <56E37014.7030305@roeck-us.net>
Date:	Fri, 11 Mar 2016 17:25:40 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Cong Wang <xiyou.wangcong@...il.com>
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 03/11/2016 04:13 PM, Cong Wang wrote:
> 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.
>
Yes, overall I would hope that 4.1.y should be up to date and working now.

Guenter