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Date:	Wed, 02 Jul 2014 23:54:08 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	punnaiah choudary kalluri <punnaia@...inx.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: Kernel BUG while sending data on 10mbps halfduplex link

On Thu, 2014-07-03 at 09:07 +0530, punnaiah choudary kalluri wrote:
> Hi,
> 
>   While sending the data traffic on zynq development board using 10 mbps
>  half-duplex link, observed the kernel BUG in skbuff handling.
> 
> Zynq setup:
> ifconfig eth0 192.186.1.2
> 
> Host machine setup:
> ifconfig eth0 192.186.1.3
> ethtool -s eth0 speed 10 duplex half
> tcpreplay -i eth0 kernelpaniccapturejune24.pcap
> 
>  Any pointers/directions for finding the root cause for this issue ?
> 
> root@...q:~# [  128.841470] random: nonblocking pool is initialized
> [  141.726352] skbuff: skb_over_panic: text:c031b890 len:16383
> put:16383 head:eea80000 data:eea80040 tail:0xeea8403f end:0xeea80640
> dev:eth0
> [  141.726354] ------------[ cut here ]------------
> [  141.726354] kernel BUG at net/core/skbuff.c:126!
> [  141.726355] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
> [  141.726356] Modules linked in: ipv6
> [  141.726357] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0-xilinx #1
> [  141.726358] task: c06af670 ti: c06a4000 task.ti: c06a4000
> [  141.726358] PC is at skb_panic+0x50/0x5c
> [  141.726359] LR is at skb_panic+0x50/0x5c
> [  141.726360] pc : [<c0494d68>]    lr : [<c0494d68>]    psr: 60070113
> [  141.726360] sp : c06a5de8  ip : c07b8da8  fp : 2ea80040
> [  141.726362] r10: ef10b810  r9 : c06af344  r8 : 00000000
> [  141.726362] r7 : c05d39c4  r6 : eea80000  r5 : eea80040  r4 : eea8403f
> [  141.726364] r3 : c06af670  r2 : 00000000  r1 : 60070113  r0 : 0000007d
> [  141.726365] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
> Segment kernel
> [  141.726366] Control: 18c5387d  Table: 2e9c404a  DAC: 00000015
> [  141.726367] Process swapper/0 (pid: 0, stack limit = 0xc06a4240)
> [  141.726368] Stack: (0xc06a5de8 to 0xc06a6000)
> 
> Regards,

Kernel stack trace would be useful.



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