Panic in nd6_prefix_offlink()

[Mark Johnston]

On Sat, Jan 07, 2017 at 08:11:19PM +0100, Jim wrote:
> Hello,
> 
> I observe frequent crashes on Beagle Bone Black running CURRENT r311106 at home.
> My home LAN is connected to DSL provider. The CPE router gets assigned IPv6 address (ds-lite) and advertises prefix/route to the LAN.
> Every night the DSL connection is terminated by provider. Upon connection is reestablished the new IPv6 prefix is assigned to router and then advertised to LAN. 
> This event seems to cause kernel panic on Beagelebone board which goes to db> prompt.
> 
> Backtrace shows:  nd6_timer() -> nd6_prefix_offlink() -> witness_assert() -> vpanic() 
> Here is the backtrace:

Thanks for the report. This should be addressed by r311695.