freebsd stable - Feb 2019 - More CARP issues under 12

On 17.01.2019 15:19, Pete French wrote:
> so, having got a workaround for yesterdays problems, I now went to upgrade
my
> other pair of boxes using CARP. No 'pf' on these, just one shared
address.
> This is the setup I have tested in development and it works fine.
> 
> I install the new kenel and do the first reboot - and I get the panic
> below. Maybe its not carp related, but seems suspicious as the last
> thing it spits out is a carp message.
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x28
> fault code              = supervisor read data, page not present
> instruction pointer     = 0x20:0xffffffff80ca0de1
> stack pointer           = 0x28:0xfffffe00004da740
> frame pointer           = 0x28:0xfffffe00004da760
> 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         = 12 (swi4: clock (0))
> trap number             = 12
> panic: page fault
> cpuid = 0
> time = 1547727391
> KDB: stack backtrace:
> #0 0xffffffff80be8597 at kdb_backtrace+0x67
> #1 0xffffffff80b9ccf3 at vpanic+0x1a3
> #2 0xffffffff80b9cb43 at panic+0x43
> #3 0xffffffff8107382f at trap_fatal+0x35f
> #4 0xffffffff81073889 at trap_pfault+0x49
> #5 0xffffffff81072eae at trap+0x29e
> #6 0xffffffff8104e1a5 at calltrap+0x8
> #7 0xffffffff80ca0ce6 at ether_output+0x6b6
> #8 0xffffffff80d0bda4 at arprequest+0x4c4
> #9 0xffffffff80d0d9fc at garp_rexmit+0xbc
> #10 0xffffffff80bb6ba9 at softclock_call_cc+0x129
> #11 0xffffffff80bb7089 at softclock+0x79
> #12 0xffffffff80b60e79 at ithread_loop+0x169
> #13 0xffffffff80b5e012 at fork_exit+0x82
> #14 0xffffffff8104f18e at fork_trampoline+0xe
> Uptime: 19s
Hi,

What branch and revision do you use? Can you install gdb and then obtain
this information:

# kgdb

(kgdb) list *ether_output+0x6b6

-- 
WBR, Andrey V. Elsukov

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> Hi,
>
> What branch and revision do you use? Can you install gdb and then obtain
> this information:
The branch and revision is 12.0-STABLE r343538 GENERIC
> # kgdb
>
> (kgdb) list *ether_output+0x6b6
trying to do this on the actual box is hard, as it panics, but on another
machine running the same build I get this, which should suffice if you
are just interested in seeing the line in the source code ?

(kgdb)  list *ether_output+0x6b6
0xffffffff80ca1526 is in ether_output (/usr/src/sys/net/if_ethersubr.c:435).
430                     if (m == NULL)
431                             return (0);
432             }
433
434             /* Continue with link-layer output */
435             return ether_output_frame(ifp, m);
436     }
437
438     static bool
439     ether_set_pcp(struct mbuf **mp, struct ifnet *ifp, uint8_t pcp)