LOR kern_sig.c + vm_kern.c

$ uname -a
FreeBSD satanasso.local.net 9.0-CURRENT FreeBSD 9.0-CURRENT #1: Mon Oct 11 09:
10:51 CEST 2010     root_at_satanasso.local.net:/usr/obj/usr/src/sys/SATANASSO  
i386

lock order reversal:
1st 0xc6befdd0 process lock (process lock) _at_ /usr/src/sys/kern/kern_sig.c:3341
2nd 0xc19b60e4 system map (system map) _at_ /usr/src/sys/vm/vm_kern.c:315
KDB: stack backtrace:
db_trace_self_wrapper(c0914c5e,762f7379,6d762f6d,72656b5f,3a632e6e,...) at 
db_trace_self_wrapper+0x26
kdb_backtrace(c065397b,c0917db7,c591d340,c591e110,e83d1764,...) at 
kdb_backtrace+0x2a
_witness_debugger(c0917db7,c19b60e4,c0936364,c591e110,c09366a4,...) at 
_witness_debugger+0x26
witness_checkorder(c19b60e4,9,c09366a4,13b,0,...) at witness_checkorder+0x839
_mtx_lock_flags(c19b60e4,0,c09366a4,13b,c1995e80,...) at _mtx_lock_flags+0xc4
_vm_map_lock(c19b6088,c09366a4,13b,c09359b5,c6725b40,...) at _vm_map_lock+0x31
kmem_malloc(c19b6088,1000,101,e83d1834,c083e233,...) at kmem_malloc+0x3a
page_alloc(c5de4a80,1000,e83d1827,101,c5de4a80,...) at page_alloc+0x27
keg_alloc_slab(c1995e88,4,c09359b5,83b,e83d1874,...) at keg_alloc_slab+0xe3
keg_fetch_slab(101,8,c5e1ef24,e83d18d4,c084008d,...) at keg_fetch_slab+0x17e
zone_fetch_slab(c5de4a80,c1995e80,101,7f1,c0663577,...) at 
zone_fetch_slab+0x4c
uma_zalloc_arg(c5de4a80,0,101,e83d1918,c061d135,...) at uma_zalloc_arg+0x5dd
ksiginfo_alloc(0,e83d1918,e83d1970,17,c6befd48,...) at ksiginfo_alloc+0x37
sigqueue_add(c6d14aa8,0,c09116ff,81f,2,...) at sigqueue_add+0x175
tdsendsignal(c6befd48,c6bf6000,17,e83d1970,0,...) at tdsendsignal+0x3ce
psignal(c6befd48,17,c09116ff,d0d,c5922140,...) at psignal+0x47
pgsigio(c5a7c0e0,17,0,c5a7c000,e83d1a98,...) at pgsigio+0xf1
tty_wakeup(c5a7c000,1,c091a9ec,447,3,...) at tty_wakeup+0x44
ttydisc_rint_done(c5a7c000,7f,0,c0,0,...) at ttydisc_rint_done+0xa4
sysmouse_event(c67064c0,14,2,0,2,...) at sysmouse_event+0x210
sc_mouse_ioctl(c5a7bc00,c014630a,c67064c0,c6725b40,c090ac47,...) at 
sc_mouse_ioctl+0x2a6
sctty_ioctl(c5a7bc00,c014630a,c67064c0,c6725b40,e83d1bb4,...) at 
sctty_ioctl+0xa4
consolectl_ioctl(c5c97b00,c014630a,c67064c0,3,c6725b40,...) at 
consolectl_ioctl+0x29
giant_ioctl(c5c97b00,c014630a,c67064c0,3,c6725b40,...) at giant_ioctl+0x75
devfs_ioctl_f(c67ef000,c014630a,c67064c0,c595a300,c6725b40,...) at 
devfs_ioctl_f+0x10b
kern_ioctl(c6725b40,4,c014630a,c67064c0,13d1cec,...) at kern_ioctl+0x20d
ioctl(c6725b40,e83d1cec,e83d1d28,e83d1d80,0,...) at ioctl+0x12f
syscallenter(c6725b40,e83d1ce4,e83d1d1c,c089cc06,74a,...) at 
syscallenter+0x263
syscall(e83d1d28) at syscall+0x34
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (54, FreeBSD ELF32, ioctl), eip = 0x281b179b, esp = 0xbfbfe98c, 
ebp = 0xbfbfeb18 ---