Double fault during reboot/shutdown

[Matthew Dillon]

:On Mon, Jun 2, 2008 at 4:50 AM, Matthew Dillon
:<dillon at apollo.backplane.com> wrote:
:>    A recent commit at some point in the last few weeks is causing
:>    real-kernel reboots and shutdowns to ocassionally double-fault.
:>    vkernels also occassionally seg-fault on shutdown.
:
:Strange, I have four boxes runs HEAD from May 31.  Though rebooting of
:these boxes is not very frequent, I didn't experience the problem you
:described (both UP and MP).
:
:Best Regards,
:sephe

    I found the bug.  It's a bug in the objcache calls to free the thread
    structure.  objcache_put() is being called with td in the context of
    that same td, which is illegal.

    What I will have to do is put a one-entry TD cache back in the per-cpu
    globaldata so the TD remains valid through cpu_thread_exit().

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>