[issue833] cache_lock: blocked on 0xe29c3b08 ""

[Simon 'corecode' Schubert]

David W wrote:
> OK, after having dumped qemu as a debugging solution for SMP kernels, 
> I have discovered vkernels. I am able to reproduce the bug in a vkernel
> with options QUOTA and SMP (without annoying qemu bugs). After attaching
> gdb to the vkernel I am unable to get a decent backtrace. GDB has trouble
> accessing the memory and gives Device Busy errors. Anyway I thought this
> information might be of some help. For what it's worth, I have a picture of the 
> backtrace at http://woe.likewhoa.net/~david/vkernel_bt.jpg This is after the
> vkernel gets hung up. (Note: I still use qemu, just not its smp functionality
> as this picture is of qemu running DragonFly GENERIC and a vkernel inside
> of that)

I guess a simple shell script should be sufficient so that Matt can
reproduce the bug.  Unless of course you want to get your hands dirty
yourself.  In this case I guess gdb needs to be extended to be able to
deal with multiple threads :)

cheers
  simon


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