freebsd 7.2stable em0: discard frame w/o packet header

[Sergey Radashevskiy]

The system panic with error  kernel: em0: discard frame w/o packet header
Crach dump one
kgdb /boot/kernel/kernel /var/crash/vmcore.5
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xd9c6f105
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0x808a021f
stack pointer           = 0x28:0x85909c10
frame pointer           = 0x28:0x85909c44
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 (swi4: clock sio)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 11h51m2s
Physical memory: 1936 MB
Dumping 331 MB: 316 300 284 268 252 236 220 204 188 172 156 140 124 108 92 76 60 44 28 12

(kgdb) where
#0  doadump () at pcpu.h:196
#1  0x8069a618 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0x8069a8f5 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0x8095f294 in trap_fatal (frame=0x85909bd0, eva=3653693701) at /usr/src/sys/i386/i386/trap.c:950
#4  0x8095f4fd in trap_pfault (frame=0x85909bd0, usermode=0, eva=3653693701) at /usr/src/sys/i386/i386/trap.c:863
#5  0x8095febd in trap (frame=0x85909bd0) at /usr/src/sys/i386/i386/trap.c:541
#6  0x8094479b in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7  0x808a021f in uma_zfree_arg (zone=0x86a3b000, item=0x8cdcd580, udata=0x868fa000) at /usr/src/sys/vm/uma_core.c:2253
#8  0x8075492b in ng_netflow_expire (arg=0x868fa000) at /usr/src/sys/netgraph/netflow/netflow.c:215
#9  0x806ac441 in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:274
#10 0x806789c9 in ithread_loop (arg=0x85c9d3d0) at /usr/src/sys/kern/kern_intr.c:1181
#11 0x80675271 in fork_exit (callout=0x8067882d <ithread_loop>, arg=0x85c9d3d0, frame=0x85909d38) at /usr/src/sys/kern/kern_fork.c:811
#12 0x80944810 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:271

Crach dump two

kgdb /boot/kernel.old/kernel /var/crash/vmcore.4

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0xc
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0x806ec864
stack pointer           = 0x28:0x85912a64
frame pointer           = 0x28:0x85912a90
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         = 3 (ng_queue1)
trap number             = 12
panic: page fault
cpuid = 1
Uptime: 12h4m33s
Physical memory: 1936 MB
Dumping 154 MB: 139 123 107 91 75 59 43 27 11

(kgdb) where
#0  doadump () at pcpu.h:196
#1  0x8069a618 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0x8069a8f5 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0x8095f294 in trap_fatal (frame=0x85912a24, eva=12) at /usr/src/sys/i386/i386/trap.c:950
#4  0x8095f4fd in trap_pfault (frame=0x85912a24, usermode=0, eva=12) at /usr/src/sys/i386/i386/trap.c:863
#5  0x8095febd in trap (frame=0x85912a24) at /usr/src/sys/i386/i386/trap.c:541
#6  0x8094479b in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7  0x806ec864 in m_copym (m=0x0, off0=1496, len=1496, wait=1) at /usr/src/sys/kern/uipc_mbuf.c:539
#8  0x807912a3 in ip_fragment (ip=0x862146d6, m_frag=0x85912b5c, mtu=1500, if_hwassist_flags=38, sw_csum=1)
    at /usr/src/sys/netinet/ip_output.c:731
#9  0x80791f4d in ip_output (m=0x86214600, opt=0x0, ro=0x85912b30, flags=32, imo=0x0, inp=0x88518bf4)
    at /usr/src/sys/netinet/ip_output.c:570
#10 0x8079332f in rip_output (m=0x86341d00, so=0x87a86d00, dst=3540521226) at /usr/src/sys/netinet/raw_ip.c:408
#11 0x807933f4 in rip_send (so=0x87a86d00, flags=0, m=0x86341d00, nam=0x0, control=0x0, td=0x85cff480)
    at /usr/src/sys/netinet/raw_ip.c:880
#12 0x806f590d in sosend_generic (so=0x87a86d00, addr=0x0, uio=0x0, top=0x86341d00, control=0x0, flags=0, td=0x85cff480)
    at /usr/src/sys/kern/uipc_socket.c:1243
#13 0x806f1767 in sosend (so=0x87a86d00, addr=0x0, uio=0x0, top=0x86341d00, control=0x0, flags=0, td=0x85cff480)
    at /usr/src/sys/kern/uipc_socket.c:1285
#14 0x807652e4 in ng_ksocket_rcvdata (hook=0x89164180, item=0x86925a50) at /usr/src/sys/netgraph/ng_ksocket.c:927
#15 0x8075986f in ng_apply_item (node=0x88f33900, item=0x86925a50, rw=0) at /usr/src/sys/netgraph/ng_base.c:2336
#16 0x8075acf5 in ngthread (arg=0x0) at /usr/src/sys/netgraph/ng_base.c:3304
#17 0x80675271 in fork_exit (callout=0x8075aaa9 <ngthread>, arg=0x0, frame=0x85912d38) at /usr/src/sys/kern/kern_fork.c:811
#18 0x80944810 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:271

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