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

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Message-ID: <20210519112029.3jbw74fuqe4p2tjm@gondor.apana.org.au>
Date:   Wed, 19 May 2021 19:20:29 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     sharathv@...eaurora.org
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 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,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt