panic: starting DAD on non-tentative address 0xfffff800034a5800,

[Bjoern A. Zeeb]

On 3 Jun 2020, at 20:15, Alexander V. Chernikov wrote:

> 03.06.2020, 11:46, "Bjoern A. Zeeb" <bzeeb-lists at lists.zabbadoz.net>:
>> Hi,
>>
>> got this with HEAD from a few days ago, just in case it rings a bell
>> with someone.
> I'm curious what are the conditions. Was it the first "up" for the 
> interface?
> It looks like we're not locking anything in nd6_dad_timer, so 
> potentially if one configures IPv6 address, waits for most of the dad 
> timer, then do down/up, this can potentially happen.

I cannot really say.  I plugged an unsupported interface into USB;  
there were two other wifi dongles on the USB hub.  When I came back to 
the machine console later in the day, I found this.  Not sure if it was 
related.


>> Otherwise I’ll go investigate when it happens again; I’ll try to
>> setup netdump to get more information.
>>
>> panic: starting DAD on non-tentative address 0xfffff800034a5800
>> cpuid = 1
>> time = 1500939739
>> KDB: stack backtrace:
>> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
>> 0xfffffe003b65a690
>> vpanic() at vpanic+0x182/frame 0xfffffe003b65a6e0
>> panic() at panic+0x43/frame 0xfffffe003b65a740
>> nd6_dad_start() at nd6_dad_start+0x3bb/frame 0xfffffe003b65a7e0
>> in6_if_up() at in6_if_up+0x62/frame 0xfffffe003b65a820
>> if_up() at if_up+0x69/frame 0xfffffe003b65a850
>> ifhwioctl() at ifhwioctl+0xbf8/frame 0xfffffe003b65a8d0
>> ifioctl() at ifioctl+0x3ac/frame 0xfffffe003b65a9a0
>> kern_ioctl() at kern_ioctl+0x27b/frame 0xfffffe003b65aa00
>> sys_ioctl() at sys_ioctl+0x127/frame 0xfffffe003b65aad0
>> amd64_syscall() at amd64_syscall+0x140/frame 0xfffffe003b65abf0
>> fast_syscall_common() at fast_syscall_common+0x101/frame
>> 0xfffffe003b65abf0
>> --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80047cd8a, rsp =
>> 0x7fffffffe258, rbp = 0x7fffffffe2b0 ---
>> KDB: enter: panic
>> [ thread pid 12247 tid 100088 ]
>> Stopped at kdb_enter+0x37: movq $0,0x10c9ad6(%rip)
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