This is copied from a serial console.  This is repeatable - every time I do 
sysrq-f, it panics - keyboard, VGA and network go down, but USB and the serial 
console stay up (can tell from the hid-input messages the mouse is spewing in 
-mm2).  I end up having to pull the power cord to shut it down.

.config attached.

SysRq : Manual OOM execution
oom-killer: gfp_mask=0xd0
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1
cpu 0 cold: low 0, high 2, batch 1
Normal per-cpu:
cpu 0 hot: low 4, high 12, batch 2
cpu 0 cold: low 0, high 4, batch 2
HighMem per-cpu: empty
 

Free pages:        2952kB (0kB HighMem)
Active:2407 inactive:8976 dirty:23 writeback:0 unstable:0 free:738 slab:1103 
mapped:705 pagetables:62
DMA free:1376kB min:256kB low:320kB high:384kB active:580kB inactive:9444kB 
present:16384kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 46 46
Normal free:1576kB min:752kB low:940kB high:1128kB active:9048kB inactive:26460kB 
present:48064kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
HighMem free:0kB min:128kB low:160kB high:192kB active:0kB inactive:0kB 
present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 92*4kB 28*8kB 13*16kB 4*32kB 1*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 
0*4096kB = 1376kB
Normal: 22*4kB 28*8kB 11*16kB 6*32kB 4*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 
0*2048kB 0*4096kB = 1576kB
HighMem: empty
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap  = 498952kB
Total swap = 498952kB
Out of Memory: Killed process 1782 (sshd).
scheduling while atomic: swapper/0x00010002/0
  [<c0103e07>] dump_stack+0x17/0x20
  [<c03b53f3>] schedule+0x573/0x580
  [<c03b5f8b>] schedule_timeout+0x5b/0xb0
  [<c027b332>] __handle_sysrq+0x82/0x140
  [<c02762d3>] kbd_event+0x93/0xf0
  [<c02f8343>] input_event+0xd3/0x3b0
  [<c02fac4f>] atkbd_report_key+0x2f/0x90
  [<c02fae9e>] atkbd_interrupt+0x1ee/0x530
  [<c02919f4>] serio_interrupt+0x44/0xa8
  [<c0292660>] i8042_interrupt+0x140/0x310
  [<c013955a>] handle_IRQ_event+0x2a/0x60
  [<c013966d>] __do_IRQ+0xdd/0x150
  [<c010526a>] do_IRQ+0x4a/0x70
  =======================
  [<c010398e>] common_interrupt+0x1a/0x20
  [<c0101100>] cpu_idle+0x50/0x60
  [<c04ad831>] start_kernel+0x151/0x170
  [<c010019f>] 0xc010019f
bad: scheduling from the idle thread!
  [<c0103e07>] dump_stack+0x17/0x20
  [<c03b53b8>] schedule+0x538/0x580
  [<c03b5f8b>] schedule_timeout+0x5b/0xb0
  [<c027b332>] __handle_sysrq+0x82/0x140
  [<c02762d3>] kbd_event+0x93/0xf0
  [<c02f8343>] input_event+0xd3/0x3b0
  [<c02fac4f>] atkbd_report_key+0x2f/0x90
  [<c02fae9e>] atkbd_interrupt+0x1ee/0x530
  [<c02919f4>] serio_interrupt+0x44/0xa8
  [<c0292660>] i8042_interrupt+0x140/0x310
  [<c013955a>] handle_IRQ_event+0x2a/0x60
  [<c013966d>] __do_IRQ+0xdd/0x150
  [<c010526a>] do_IRQ+0x4a/0x70
  =======================
  [<c010398e>] common_interrupt+0x1a/0x20
  [<c0101100>] cpu_idle+0x50/0x60
  [<c04ad831>] start_kernel+0x151/0x170
  [<c010019f>] 0xc010019f
Unable to handle kernel NULL pointer dereference at virtual address 00000000
  printing eip:
c01143b4
*pde = 00000000
Oops: 0002 [#1]
PREEMPT
Modules linked in: tulip
CPU:    0
EIP:    0060:[<c01143b4>]    Not tainted VLI
EFLAGS: 00010092   (2.6.11-rc2-mm2)
EIP is at dequeue_task+0x14/0x70
eax: c0414ba0   ebx: c0414b80   ecx: c0414b80   edx: 00000000
esi: 00000000   edi: 00000086   ebp: c04e3e10   esp: c04e3e08
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, threadinfo=c04e3000 task=c0414b80)
Stack: c0414b80 c04e3e70 c04e3e1c c01146a0 c0414b80 c04e3e5c c03b4fae c03cb6d8
        c0414d20 00010002 00000000 00000000 c04e3e70 3b9aca00 55393de2 00000019
        c0414b80 c0414ca4 fffcc59e c04e3e70 00000086 c04e3e98 c03b5f8b c04e3e7c
Call Trace:
  [<c0103dda>] show_stack+0x7a/0x90
  [<c0103f59>] show_registers+0x149/0x1b0
  [<c010414d>] die+0xdd/0x170
  [<c01133ea>] do_page_fault+0x30a/0x65a
  [<c0103a57>] error_code+0x2b/0x30
  [<c01146a0>] deactivate_task+0x10/0x20
  [<c03b4fae>] schedule+0x12e/0x580
  [<c03b5f8b>] schedule_timeout+0x5b/0xb0
  [<c027b332>] __handle_sysrq+0x82/0x140
  [<c02762d3>] kbd_event+0x93/0xf0
  [<c02f8343>] input_event+0xd3/0x3b0
  [<c02fac4f>] atkbd_report_key+0x2f/0x90
  [<c02fae9e>] atkbd_interrupt+0x1ee/0x530
  [<c02919f4>] serio_interrupt+0x44/0xa8
  [<c0292660>] i8042_interrupt+0x140/0x310
  [<c013955a>] handle_IRQ_event+0x2a/0x60
  [<c013966d>] __do_IRQ+0xdd/0x150
  [<c010526a>] do_IRQ+0x4a/0x70
  =======================
  [<c010398e>] common_interrupt+0x1a/0x20
  [<c0101100>] cpu_idle+0x50/0x60
  [<c04ad831>] start_kernel+0x151/0x170
  [<c010019f>] 0xc010019f
Code: e8 42 0e 00 00 5d b8 e0 83 4e c0 c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 
e5 83 ec 08 89 1c 24 89 c3 8d 40 20 89 74 24 04 89 d6 <ff> 0a 8b 48 04 39 0
  <0>Kernel panic - not syncing: Fatal exception in interrupt