dhcpcd-discuss

On Wed, Jan 23, 2019 at 11:23 AM Roy Marples <roy@xxxxxxxxxxxx> wrote:

> Hi Athan
>
> On 22/01/2019 23:30, Athan Papadimitriou wrote:
> > I'm using dhcpcd on my FreeBSD router/gateway together with mpd5 (pppoe)
> > getting ipv6 /56 prefix from ISP and distributing it to my internal
> network.
> > After updating from 7.0.8 to 7.1.0 using exactly the same build and
> > configuration setup it crashes kernel when it starts and cause system
> halt.
> >
> > dhcpcd.conf follows
> > ------------------------------
> > duid
> > noipv4
> > noipv4ll
> > noipv6rs
> > ipv6only
> > release
> > option rapid_commit
> > option interface_mtu
> > option classless_static_routes
> > require dhcp_server_identifier
> > nohook resolv.conf, hostname, ntp, test, dump
> > allowinterfaces ng0 bridge0
> > interface ng0
> >      ipv6rs
> >      ipv6ra_noautoconf
> >      ia_pd 1 bridge0/0/64
> > -------------------------------------
> >
> > ng0 is the default netgraph interface dynamically created by mpd5 and
> > bridge0 is my internal networking bridge interface.
> > This configuration worked flawlessly for years, even after upgrading to
> > FreeBSD 12.0. I had to revert to dhcpcd 7.0.8 until this issue fixed.
>
> I'm still using FreeBSD 11, I'll update my image to 12 and try it.
> Can you post a backtrace of the kernel crash though?
>
> Roy
>

Hi Roy,

Here is the backtrace

Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 06
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80c99595
stack pointer           = 0x28:0xfffffe004f30e4c0
frame pointer           = 0x28:0xfffffe004f30e4f0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1498 (dhcpcd)
trap number             = 12
panic: page fault
cpuid = 3
time = 1548198218
KDB: stack backtrace:
#0 0xffffffff80be7977 at kdb_backtrace+0x67
#1 0xffffffff80b9b563 at vpanic+0x1a3
#2 0xffffffff80b9b3b3 at panic+0x43
#3 0xffffffff8107496f at trap_fatal+0x35f
#4 0xffffffff810749c9 at trap_pfault+0x49
#5 0xffffffff81073fee at trap+0x29e
#6 0xffffffff8104f315 at calltrap+0x8
#7 0xffffffff80cc2abf at rt_getifa_fib+0x13f
#8 0xffffffff80cc15c6 at rtrequest1_fib+0x436
#9 0xffffffff80cc6b90 at route_output+0xd40
#10 0xffffffff80c325e6 at sosend_generic+0x586
#11 0xffffffff80c328f0 at sosend+0x50
#12 0xffffffff80c0d6e9 at soo_write+0x49
#13 0xffffffff80c04862 at dofilewrite+0xb2
#14 0xffffffff80c043b3 at sys_write+0xc3
#15 0xffffffff81075449 at amd64_syscall+0x369

I hope it helps

Athan