Expect defunct, kill -9 panics kernel?

Dave,

Is this the usual behaviour you see?

1. I run the gcc testsuite.
2. expect dies, leaving a defunct process.
3. Killing another expect panics the kernel.

At what point in the process life are we in __wake_up and __wake_up_common?
An address of 0x10 is very suspicious.

Backtrace:

Backtrace:


Kernel Fault: Code=26 regs=0000000090958ab0 (Addr=0000000000000010)

     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00001000000001001111111100001110 Not tainted
r00-03  000000ff0804ff0e 0000000090958940 00000000401332ac 00000000909589e0
r04-07  00000000408a6e40 0000000000000000 0000000044ab9c00 0000000000000000
r08-11  0000000000000000 0000000000000001 0000000000000000 0000000000000001
r12-15  000000000000001a 0000000000000000 00000000001746a8 000000004025b6a8
r16-19  0000000000000005 0000000000000000 0000000040256b1e 0000000000000000
r20-23  0000000000000000 0000000044ab9c40 0000000000000000 0000000000000000
r24-27  0000000000000000 0000000000000001 0000000045f10250 00000000408a6e40
r28-31  0000000000000000 0000000090958a80 0000000090958ab0 0000000000000003
sr00-03  0000000000027800 0000000000000000 0000000000000000 0000000000027800
sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000

IASQ: 0000000000000000 0000000000000000 IAOQ: 0000000040133214 0000000040133218
 IIR: 52820020    ISR: 0000000000000000  IOR: 0000000000000010
 CPU:        0   CR30: 0000000090958000 CR31: 0000000040844000
 ORIG_R28: 00000000408a6e40
 IAOQ[0]: __wake_up_common+0x74/0xd8
 IAOQ[1]: __wake_up_common+0x78/0xd8
 RP(r2): __wake_up+0x34/0x50
Kernel panic - not syncing: Kernel Fault

Cheers,
Carlos.