Changing time causes ipv6 panics

[Kris Kennaway]

On Sun, Jan 15, 2006 at 07:44:38PM -0500, Kris Kennaway wrote:
> I ran ntpdate on an amd64 system with ipv6 enabled and a skewed clock
> (ntpdate stepped it back by about an hour), and immediately got a
> use-after-free panic in ifaddr.  When I rebooted with memguard enabled
> on this malloc type and retried, I got this panic upon changing the
> date forward, then back, then forward again (also note the garbage
> return data from ntpdate):

Has anyone looked at this?  This is on the TODO list for 6.1, so the
sooner it can be resolved the better.

Kris

> # date 200606011200
> Thu Jun  1 12:00:00 UTC 2006
> # ntpdate ntp.apple.com
> 16 Jan 00:40:18 ntpdate[612]: step time server 17.254.0.28 offset -~9000pm6}9426375508.195959 sec
> # date 200606011200
> Thu Jun  1 12:00:00 UTC 2006
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0xffffffff91bd2198
> fault code              = supervisor write, protection violation
> instruction pointer     = 0x8:0xffffffff80321346
> stack pointer           = 0x10:0xffffffffbcfa1b60
> frame pointer           = 0x10:0xffffffffbcfa1b90
> 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         = 14 (swi4: clock sio)
> [thread pid 14 tid 100010 ]
> Stopped at      nd6_timer+0x106:        movl    %eax,0x198(%rbx)
> db> wh
> Tracing pid 14 tid 100010 td 0xffffff03e15d6c30
> nd6_timer() at nd6_timer+0x106
> softclock() at softclock+0x279
> ithread_execute_handlers() at ithread_execute_handlers+0x12f
> ithread_loop() at ithread_loop+0x99
> fork_exit() at fork_exit+0xdf
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffbcfa1d40, rbp = 0 ---
> 
> Unfortunately I can't dump on this system, but:
> 
> (kgdb) list *(nd6_timer+0x106)
> 0xffffffff80321346 is in nd6_timer (../../../netinet6/nd6.c:585).
> 580                                     goto addrloop; /* XXX: see below */
> 581                     }
> 582                     if (IFA6_IS_DEPRECATED(ia6)) {
> 583                             int oldflags = ia6->ia6_flags;
> 584
> 585                             ia6->ia6_flags |= IN6_IFF_DEPRECATED;
> 586
> 587                             /*
> 588                              * If a temporary address has just become deprecated,
> 589                              * regenerate a new one if possible.
> 
> Kris
> 
> 


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