Bug 95151

[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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Unread portion of the kernel message buffer:
drm0: <SiS 630> port 0xa800-0xa87f mem 0xf0000000-0xf7ffffff,0xe9800000-0xe981ffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xec000000 64MB
info: [drm] Initialized sis 1.1.0 20030826 on minor 0
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address	= 0x74
fault code		= supervisor read, page not present
instruction pointer	= 0x20:0xc0657d4d
stack pointer	        = 0x28:0xcbb21a5c
frame pointer	        = 0x28:0xcbb21a60
code segment		= base rx0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, def32 1, gran 1
processor eflags	= resume, IOPL = 3
current process		= 489 (Xorg)
trap number		= 12
panic: page fault
Uptime: 41s
Dumping 111 MB (2 chunks)
  chunk 0: 1MB (159 pages) ... ok
  chunk 1: 111MB (28412 pages) 96 80 64 48 32 16

#0  doadump () at pcpu.h:165
165		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0  doadump () at pcpu.h:165
#1  0xc0638202 in boot (howto=260) at ../../../kern/kern_shutdown.c:399
#2  0xc0638498 in panic (fmt=0xc084e5a2 "%s")
    at ../../../kern/kern_shutdown.c:555
#3  0xc0807c30 in trap_fatal (frame=0xcbb21a1c, eva=116)
    at ../../../i386/i386/trap.c:831
#4  0xc08073d2 in trap (frame=
      {tf_fs = -1066991608, tf_es = -1018757080, tf_ds = 40, tf_edi = -1053330432, tf_esi = -1053083392, tf_ebp = -877520288, tf_isp = -877520312, tf_ebx = -1053097216, tf_edx = -1053097216, tf_ecx = 0, tf_eax = -1053083360, tf_trapno = 12, tf_err = 0, tf_eip = -1067090611, tf_cs = 32, tf_eflags = 77827, tf_esp = -1053083392, tf_ss = -877520252}) at ../../../i386/i386/trap.c:267
#5  0xc07f6dca in calltrap () at ../../../i386/i386/exception.s:139
#6  0xc0657d4d in turnstile_setowner (ts=0xc13b0300, owner=0x0)
    at ../../../kern/subr_turnstile.c:417
#7  0xc0658044 in turnstile_wait (lock=0xc13774a0, owner=0x0)
    at ../../../kern/subr_turnstile.c:576
#8  0xc062fa6c in _mtx_lock_sleep (m=0xc13774a0, tid=3241883904, opts=0, 
    file=0xc17cc874 "/usr/src/sys/modules/drm/drm/../../../dev/drm/drm_vm.c", 
    line=54) at ../../../kern/kern_mutex.c:553
#9  0xc062f8d0 in _mtx_lock_flags (m=0x0, opts=0, 
    file=0xc17cc874 "/usr/src/sys/modules/drm/drm/../../../dev/drm/drm_vm.c", 
    line=54) at ../../../kern/kern_mutex.c:274
#10 0xc17cb2b7 in ?? ()
#11 0xc13774a0 in ?? ()
#12 0x00000000 in ?? ()
#13 0xc17cc874 in ?? ()
#14 0x00000036 in ?? ()
#15 0xc13774e8 in ?? ()
#16 0xc1757900 in ?? ()
#17 0xc17d1000 in ?? ()
#18 0xc17cdc80 in ?? ()
#19 0xcbb21b00 in ?? ()
#20 0xc061010b in giant_mmap (dev=0xc13774a0, offset=3246198784, 
    paddr=0xcbb21b28, nprot=3) at ../../../kern/kern_conf.c:349
Previous frame identical to this frame (corrupt stack?)
(kgdb) quit

How-To-Repeat: 'X -config xorg.conf.new'