Re: Panic during boot (in_arpinput).

Ian FREISLICH wrote:
> Hi
> 
> I have 2 servers each with 255 vlan interfaces and carp interfaces
> in each vlan.During the boot up while it's configuring the interfaces,
> it reliably panics.  It boots fine if no network cables are plugged
> in (and in the test evironment on a quient lan).
> 
> It's an SMP machine.  My guess (from the panic message below) is
> that an arp query arives on an interface it's in the middle of
> creating or something like that (highly unsophisticated debugging
> conjecture).
> 
> In the mean time I'm going to try a UP kernel and see if that masks
> the problem.

FWIW, a UP kernel has the same problem.

> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x5f
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc058e18b
> stack pointer           = 0x28:0xe34d9bb0
> frame pointer           = 0x28:0xe34d9c2c
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 14 (swi1: net)
> trap number             = 12
> panic: page fault
> cpuid = 0
> KDB: stack backtrace:
> db_trace_self_wrapper(c06830f9,e34d9a74,c04eff40,c0695d9f,0,...) at db_trace_
sel
> f_wrapper+0x27
> kdb_backtrace(c0695d9f,0,c067664b,e34d9a80,80,...) at kdb_backtrace+0x2f
> panic(c067664b,c0696cfe,c49135fc,1,1,...) at panic+0x129
> trap_fatal(e34d9b70,5f,1,0,e34d9ae4,...) at trap_fatal+0x332
> trap_pfault(e34d9b70,0,5f,b,5f,...) at trap_pfault+0x232
> trap(c06e0008,c4910028,e34d0028,0,c4e57800,...) at trap+0x3cb
> calltrap() at calltrap+0x5
> --- trap 0xc, eip = 0xc058e18b, esp = 0xe34d9bb0, ebp = 0xe34d9c2c ---
> in_arpinput(c4fc3200,c04e3a0f,c06e5424,0,c4fc3200,...) at in_arpinput+0x123
> arpintr(c4fc3200,c06e5424,0,c4914c40,e34d9c70,...) at arpintr+0xfb
> netisr_processqueue(c06ed4f8,c4914540,c4914c40,c4914c40,c4913460,...) at neti
sr_
> processqueue+0xcc
> swi_net(0,c4914c40,246,0,c4914c40,...) at swi_net+0x125
> ithread_execute_handlers(c4913460,c496e480,0,0,0,...) at ithread_execute_hand
ler
> s+0x165
> ithread_loop(c48f6810,e34d9d38,7fdec364,3ae77ec0,3940eec5,...) at ithread_loo
p+0
> x64
> fork_exit(c04d405d,c48f6810,e34d9d38) at fork_exit+0x83
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xe34d9d6c, ebp = 0 ---
> Uptime: 9m35s
> Physical memory: 2039 MB
> Dumping 64 MB: 49 33 17 1
> (kgdb) bt
> #0  doadump () at pcpu.h:166
> #1  0xc04efc20 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:411
> #2  0xc04effff in panic (fmt=0xc067664b "%s")
>     at /usr/src/sys/kern/kern_shutdown.c:567
> #3  0xc06508e3 in trap_fatal (frame=0xe34d9b70, eva=95)
>     at /usr/src/sys/i386/i386/trap.c:869
> #4  0xc065058d in trap_pfault (frame=0xe34d9b70, usermode=0, eva=95)
>     at /usr/src/sys/i386/i386/trap.c:778
> #5  0xc06500ff in trap (frame=
>       {tf_fs = -1066532856, tf_es = -997130200, tf_ds = -481492952, tf_edi = 
0, tf_esi = -991594496, tf_ebp = -481453012, tf_isp = -481453156, tf_ebx = 3, t
f_edx = 314, tf_ecx = -1, tf_eax = -996395008, tf_trapno = 12, tf_err = 0, tf_e
ip = -1067916917, tf_cs = 32, tf_eflags = 66118, tf_esp = -481453064, tf_ss = -
989906900}) at /usr/src/sys/i386/i386/trap.c:463
> #6  0xc063771a in calltrap () at /usr/src/sys/i386/i386/exception.s:138
> #7  0xc058e18b in in_arpinput (m=0xc4fc3200)
>     at /usr/src/sys/netinet/if_ether.c:635
> #8  0xc058e058 in arpintr (m=0xc4fc3200)
>     at /usr/src/sys/netinet/if_ether.c:552
> #9  0xc0586213 in netisr_processqueue (ni=0xc06ed4f8)
>     at /usr/src/sys/net/netisr.c:236
> #10 0xc0586464 in swi_net (dummy=0x0) at /usr/src/sys/net/netisr.c:349
> #11 0xc04d3f7b in ithread_execute_handlers (p=0xc4913460, ie=0xc496e480)
>     at /usr/src/sys/kern/kern_intr.c:666
> ---Type <return> to continue, or q <return> to quit--- 
> #12 0xc04d40c1 in ithread_loop (arg=0xc48f6810)
>     at /usr/src/sys/kern/kern_intr.c:749
> #13 0xc04d2914 in fork_exit (callout=0xc04d405d <ithread_loop>, 
>     arg=0xc49c3800, frame=0xc49c3800) at /usr/src/sys/kern/kern_fork.c:834
> #14 0xc063777c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:19
9
> (kgdb) frame 7
> #7  0xc058e18b in in_arpinput (m=0xc4fc3200)
>     at /usr/src/sys/netinet/if_ether.c:635
> 635                     if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
> (kgdb) l
> 630              * is part of carp, we call carp_iamatch to see if this is a
> 631              * request for the virtual host ip.
> 632              * XXX: This is really ugly!
> 633              */
> 634             LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
> 635                     if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
> 636                         (ia->ia_ifp == ifp)) &&
> 637                         itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
> 638                             goto match;
> 639     #ifdef DEV_CARP
> (kgdb) print bridged
> $1 = 0
> (kgdb) print ia->ia_ifp
> There is no member named ia_ifp.
> (kgdb) print ia
> $2 = (struct in_ifaddr *) 0x3

Ian

--
Ian Freislich