panic: page fault

[Peter Avalos <pavalos@xxxxxxxxxxxx>]

Core is being uploaded to leaf.

It looks like this was caused by tcpdump.  From a kernel that's about a month old:

panic: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
mp_lock = 00000000; cpuid = 0; lapic.id = 00000000
fault virtual address   = 0x8
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc020bd9d
stack pointer           = 0x10:0xdaaa8b60
frame pointer           = 0x10:0xdaaa8b8c
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         = Idle
current thread          = pri 12
 <- SMP: XXX
trap number             = 12
panic: page fault
mp_lock = 00000000; cpuid = 0; lapic.id = 00000000
boot() called on cpu#0
Uptime: 34d1h19m18s

dumping to dev #da/0x20001, offset 378927

[...]

(kgdb) bt
#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:519
#1  0xc018f9b6 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:352
#2  0xc018ff51 in panic (fmt=0xc02ee9fb "%s") at /usr/src/sys/kern/kern_shutdown.c:665
#3  0xc02d1f06 in trap_fatal (frame=0xdaaa8b20, eva=0) at /usr/src/sys/i386/i386/trap.c:1134
#4  0xc02d1b53 in trap_pfault (frame=0xdaaa8b20, usermode=0, eva=8) at /usr/src/sys/i386/i386/trap.c:1034
#5  0xc02d1739 in trap (frame=
      {tf_fs = -613416936, tf_es = -749207536, tf_ds = 16, tf_edi = -626357240, tf_esi = -1070093632, tf_ebp = -626357364, tf_isp = -626357428, tf_ebx = 0, tf_edx = -749176184, tf_ecx = -1, tf_eax = -622655136, tf_trapno = 12, tf_err = 2, tf_eip = -1071596131, tf_cs = 8, tf_eflags = 66118, tf_esp = -749176184, tf_ss = -626357380})
    at /usr/src/sys/i386/i386/trap.c:614
#6  0xc02bb94f in calltrap () at /usr/src/sys/i386/i386/exception.s:776
#7  0xdb700018 in ?? ()
#8  0xd3580010 in ?? ()
#9  0x00000010 in ?? ()
#10 0xdaaa8c08 in ?? ()
#11 0xc037aac0 in tcp_syncache ()
#12 0xdaaa8b8c in ?? ()
#13 0xdaaa8b4c in ?? ()
#14 0x00000000 in ?? ()
#15 0xd3587a88 in ?? ()
#16 0xffffffff in ?? ()
#17 0xdae30960 in ?? ()
#18 0x0000000c in ?? ()
#19 0x00000002 in ?? ()
#20 0xc020bd9d in syncache_add (inc=0xdaaa8c08, to=0xdaaa8c78, th=0x0, sop=0xdaaa8c04, m=0xeec30f00) at /usr/src/sys/netinet/tcp_syncache.c:999
#21 0xc020441b in tcp_input (m=0xeec30f00) at /usr/src/sys/netinet/tcp_input.c:1022
#22 0xc01fde9e in transport_processing_oncpu (m=0xeec30f00, hlen=20, ip=0x0, nexthop=0x0) at /usr/src/sys/netinet/ip_input.c:421
#23 0xc01fe94d in ip_input (m=0xeec30f00) at /usr/src/sys/netinet/ip_input.c:1121
#24 0xc01fdf16 in ip_input_handler (msg0=0xef182780) at /usr/src/sys/netinet/ip_input.c:452
#25 0xc0208d72 in tcpmsg_service_loop (dummy=0x0) at /usr/src/sys/netinet/tcp_subr.c:391
#26 0xc0196bf9 in lwkt_create (func=0, arg=0x0, tdp=0x0, template=0x0, tdflags=0, cpu=0, fmt=0x0) at /usr/src/sys/kern/lwkt_thread.c:1355
Previous frame inner to this frame (corrupt stack?)

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