netdev - Re: Internal error: Oops from inet_frag_find, when inserting a IP frag into a rhashtable

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Date:   Wed, 26 May 2021 20:06:55 +0530
From:   sharathv@...eaurora.org
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     tgraf@...g.ch, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, edumazet@...gle.com
Subject: Re: Internal error: Oops  from inet_frag_find, when inserting a IP
 frag into a rhashtable

On 2021-05-19 16:50, Herbert Xu wrote:
> On Wed, May 19, 2021 at 12:52:27AM +0530, sharathv@...eaurora.org 
> wrote:
>> 
>>   784.185172:   <2>  (2)[71:kworker/2:1][20210408_17:01:54.754415]@2
>> __get_vm_area_node.llvm.17374696036975823682+0x1ac/0x1c8
>>    784.185179:   <2>  (2)[71:kworker/2:1][20210408_17:01:54.754422]@2
>> __vmalloc_node_flags_caller+0xb4/0x170
>>    784.185189:   <2>  (2)[71:kworker/2:1][20210408_17:01:54.754432]@2
>> kvmalloc_node+0x40/0xa8
>>    784.185199:   <2>  (2)[71:kworker/2:1][20210408_17:01:54.754442]@2
>> rhashtable_insert_rehash+0x84/0x264
> 
> Something very fishy is going on here.
> 
> The code path in rhashtable_insert_rehash cannot possibly trigger
> vmalloc because it uses GFP_ATOMIC.  Is this a pristine upstream
> kernel or are there patches that may change things?
> 
> Cheers,

Thanks for the reply Herbert, we have got this crash reported from 
external
folks and I am trying to get the answers for your questions.