From: Marcel Hellwig
> Sent: 01 August 2018 11:36
> >> [<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 ?
>
> https://gist.github.com/hellow554/6b11c6c0827d5db80a7e66f71f5636ff#file-net_uipv4_udp-lst-L1892-L1895
>
> sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
> c0228ad8: e5943080 ldr r3, [r4, #128] ; 0x80
> c0228adc: e593300c ldr r3, [r3, #12]
> c0228ae0: e5823004 str r3, [r2, #4]
There are actually 2 faults, difficult to quickly sort out the merged
tracebacks.
You are also running a rather old kernel: Linux version 3.4.113.
It may well be that whichever ethernet driver generated the misaligned frame
has since been fixed.
David
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