Hi,

On Wed, Mar 21, 2007 at 06:20:39PM -0400, Henry R. Bent wrote:

> I am seeing a reproducible panic here on a very recent (~1 hour ago) 
> -current kernel with USER_LDT set; it goes away if I disable USER_LDT 
> (but then mplayer fails; see below).  The panic is triggered by trying 
> to use mplayer to play anything using the win32 dlls 
> (pkgsrc/multimedia/win32-codecs).  If I disable USER_LDT I can't play 
> the files, and mplayer reminds me that I need to set USER_LDT in order 
> to load the windows codecs.  I didn't get all the guts of the panic 
> since I was copying by hand, but here's the gist of it:
> 
> mutex_enter with held simple_lock 0xcec8ae74 CPU 0 
> /usr/src/src-current/sys/arch/i386/i386/sys_machdep:296
> uvm_fault(0xcec89a80, 0, 1) -> 0xe
> kernel: supervisor trap page fault, code=0
> Stopped in pid 29.1 (mplayer) at	netbsd:db_read_bytes+0x30:	movl 
> 0
> (%esi),%eax
> db{0}> bt
> db_read_bytes(...)
> db_get_value(...)
> db_stack_trace_print(...)
> simple_lock_only_held(...)
> mutex_vector_enter(...)
> gdt_get_slot(...)
> ldt_alloc(...)
> i386_set_ldt(...)
> syscall_plain(...)
> --- syscall (number 165) ---

PR 36046 is open about this one.. I'll be taking a look tomorrow.

Cheers,
Andrew