netdev - Re: Kernel panic on kernel-3.10.0-693.21.1.el7 in ndisc.h

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Date:   Mon, 14 May 2018 11:40:02 -0400
From:   Alexander Aring <aring@...atatu.com>
To:     Roman Makhov <roman.makhov@...il.com>
Cc:     linux-wpan@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Kernel panic on kernel-3.10.0-693.21.1.el7 in ndisc.h

Hi,

On Sun, May 13, 2018 at 02:35:07PM +0300, Roman Makhov wrote:
> Hello,
> 
> We have a problem with Kernel panic after upgrade from CentOS 7.3
> (kernel-3.10.0-514.el7) to CentOS 7.4 (kernel-3.10.0-693.21.1.el7).
> It occurs when we have the incoming traffic from other nodes and we
> are performing the re-configuration of IPv6 interfaces.
> 
> It is high-availability system without 802.15.4 support.
> 
> The log of crash:
> =========================================================
> #10 [ffff88043fc03cf0] async_page_fault at ffffffff816b7798
>     [exception RIP: ndisc_send_rs+238]
>     RIP: ffffffff8166575e  RSP: ffff88043fc03da8  RFLAGS: 00010202
>     RAX: 0000000000000002  RBX: ffff88042caa9000  RCX: 0000000000000001
>     RDX: 0000000000000000  RSI: 0000000000000200  RDI: ffffffff816534f7
>     RBP: ffff88043fc03dd0   R8: 0000000000000000   R9: ffffffff81e9f1c0
>     R10: 0000000000000002  R11: ffff88043fc03da8  R12: 0000000000000008
>     R13: 0000000000000006  R14: ffff88043fc03de0  R15: ffffffff81772410
>     ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
> #11 [ffff88043fc03da0] ndisc_send_rs at ffffffff81665704
> =========================================================
> 
> I see that crash points on ndisc.h, it is ndisc_ops_opt_addr_space()
> in function:
> =========================================================
> crash> kmem ffffffff8166575e
> ffffffff8166575e (T) ndisc_send_rs+238
> /usr/src/debug/kernel-3.10.0-693.21.1.el7/linux-3.10.0-693.21.1.el7.x86_64/include/net/ndisc.h:
> 251
> 
>       PAGE        PHYSICAL      MAPPING       INDEX CNT FLAGS
> ffffea0000059940   1665000                0        0  1 1fffff00000400 reserved
> crash>
> =========================================================
> 
> I checked the difference between 514 and 693 kernels is in the patch
> https://patchwork.kernel.org/patch/9179229/ .
> 
> Any suggesions about what I am doing wrong are welcome.
> 

Me as original author of this patch,

I cannot help you with such a dinosaurs kernel. Please try it with the
latest one and check if the problem still exists.

- Alex