linux-kernel - Re: AW: PROBLEM: Kernel Oops in UDP stack

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Message-ID: <96753ca4-88fe-aa26-b439-6e22eaf8b524@gmail.com>
Date:   Wed, 1 Aug 2018 03:20:24 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Marcel Hellwig <mhellwig@...-group.com>,
        'Eric Dumazet' <eric.dumazet@...il.com>,
        "'davem@...emloft.net'" <davem@...emloft.net>,
        "'kuznet@....inr.ac.ru'" <kuznet@....inr.ac.ru>,
        "'yoshfuji@...ux-ipv6.org'" <yoshfuji@...ux-ipv6.org>,
        "'andrew@...n.ch'" <andrew@...n.ch>
Cc:     "'netdev@...r.kernel.org'" <netdev@...r.kernel.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        Matthias Wystrik <mwystrik@...-group.com>
Subject: Re: AW: PROBLEM: Kernel Oops in UDP stack



On 07/31/2018 10:55 PM, Marcel Hellwig wrote:
> 
> [<c0228adc>] (udp_recvmsg+0x284/0x33c) from [<c02306e0>] (inet_recvmsg+0x38/0x4c): net/ipv4/udp.c:1234


              sin->sin_addr.s_addr = ip_hdr(skb)->saddr;

Unaligned access trap (virtual address c14fe63a), so either sin or ip_hdr(skb) are not on a 32bit alignment

Can you produce the disassembly of the trapping instruction ?

(Is is a read at address c14fe63a, or a write ...)

Thanks.