linux-kernel - Re: INFO: task hung in rtnetlink_rcv

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Date:   Sat, 23 Feb 2019 01:47:00 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Joe Perches <joe@...ches.com>
Cc:     syzbot <syzbot+8218a8a0ff60c19b8eae@...kaller.appspotmail.com>,
        ast@...nel.org, christian@...uner.io, davem@...emloft.net,
        dsahern@...il.com, hawk@...nel.org, idosch@...lanox.com,
        john.fastabend@...il.com, kafai@...com, ktkhai@...tuozzo.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        petrm@...lanox.com, roopa@...ulusnetworks.com,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        xdp-newbies@...r.kernel.org, yhs@...com
Subject: Re: INFO: task hung in rtnetlink_rcv_msg

On 02/22/2019 10:45 PM, Jakub Kicinski wrote:
> On Fri, 22 Feb 2019 12:14:57 -0800, Joe Perches wrote:
>> On Fri, 2019-02-22 at 12:01 -0800, Jakub Kicinski wrote:
>>> Hi!
>>>
>>> Seems like something funny is going on with get_maintainer.pl since XDP
>>> entry got added.  We seem to have been CCed on:  
>>
>> I suggest removing the MAINTAINERS line with
>>
>> 	K:	xdp
>>
>> as xdp is a pretty generic file/patch content
>> regex match for the K: type
>>
>> $ git grep --name-only xdp | wc -l
>> 236
>>
>> Rather more files than desired.
>>
>> The N: match is dubious too.
>>
>> It's generally better to have specific lists of
>> maintained file patterns rather than using the
>> K: and N: pattern matches.
>>
>> ---
>>  MAINTAINERS | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index d7ad97b235ec..aa703e2cb882 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -16970,7 +16970,6 @@ F:	include/net/xdp.h
>>  F:	kernel/bpf/devmap.c
>>  F:	kernel/bpf/cpumap.c
>>  F:	include/trace/events/xdp.h
>> -K:	xdp
>>  N:	xdp
>>  
>>  XDP SOCKETS (AF_XDP)
> 
> Thanks for the explanation, at least now I know why it happens! :)
> I'll leave it to Daniel to decide if we really need it removed, 
> so far the false positives weren't overwhelming, just surprising.

No strong opinion. I've seen this K+N pattern in a number of places
in the maintainers file. I'm fine either way if it gets too noisy. :)