https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218517

--- Comment #18 from emiku...@gmail.com ---
I ran "./kernel-error.d ppp 84" followed by ppp, but it didn't produce any
output.

I think the actual errno is 17, but "./kernel-error.d ppp 17" mostly produces
"Returning 17 from _rw_runlock_cookie+0x12e", e.g.:

  2  42896        _rw_runlock_cookie:return Returning 17 from
_rw_runlock_cookie+0x12e
              kernel`ifioctl+0x2f8
              kernel`kern_ioctl+0x25f
              kernel`sys_ioctl+0x140
              kernel`amd64_syscall+0x452
              kernel`0xffffffff80d95b7b

Running ppp under truss:

 8711: 5.695770520 sendto(7,"<30>Feb  9 01:24:57 ppp[8711]: tun0: IPV6CP:
deflink: LayerUp.",62,0x0,NULL,0x0) = 62 (0x3e)
 8711: 5.695952875 socket(PF_INET6,SOCK_DGRAM,0) = 2 (0x2)
 8711: 5.697504600 ioctl(2,SIOCAIFADDR_IN6,0xffffd200) ERR#17 'File exists'
 8711: 5.697701621 sendto(7,"<30>Feb  9 01:24:57 ppp[8711]: tun0: ID0: -1 =
ioctl(2, 2156423451, 0x7fffffffd200)",83,0x0,NULL,0x0) = 83 (0x53)
 8711: 5.697964153 sendto(7,"<30>Feb  9 01:24:57 ppp[8711]: tun0: ID0: bug
218517: errno = 17 (File exists)",78,0x0,NULL,0x0) = 78 (0x4e)
 8711: 5.698235484 sendto(7,"<28>Feb  9 01:24:57 ppp[8711]: tun0: Warning:
iface add: ioctl(SIOCAIFADDR_IN6, fe80::f43e:9675:fb45:aa33 ->
fe80::72e4:22ff:fe8b:df00): Value too large to be stored in data
type",178,0x0,NULL,0x0) = 178 (0xb2)

(note ERR#17)

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