lock order reversal FreeBSD-8.0-CURRENT

mymtom

启动后会出现：

1. 
   
2. lock order reversal:
   
3. 1st 0xc25aed80 kqueue (kqueue) @ /usr/src/sys/kern/kern_event.c:1397
   
4. 2nd 0xc20f57d8 sleep mtxpool (sleep mtxpool) @ /usr/src/sys/kern/sys_generic.c:1255
   
5. KDB: stack backtrace:
   
6. db_trace_self_wrapper(c0b082bc,cd10aaa4,c079cafe,c0b0a7aa,c20f57d8,...) at db_trace_self_wrapper+0x26
   
7. kdb_backtrace(c0b0a7aa,c20f57d8,c0b03f8d,c0b03f8d,c0b0aa61,...) at kdb_backtrace+0x29
   
8. witness_checkorder(c20f57d8,9,c0b0aa61,4e7,c25aed80,...) at witness_checkorder+0x6de
   
9. _mtx_lock_flags(c20f57d8,0,c0b0aa61,4e7,1,...) at _mtx_lock_flags+0xbc
   
10. selrecord(c2587880,c25aedac,c0b016fe,575,c25aed80,...) at selrecord+0x9d
    
11. kqueue_poll(c246c168,1,c25ddd00,c2587880,cd10ab74,...) at kqueue_poll+0x65
    
12. poll(c2587880,cd10acfc,c,c0b0b16c,c0bb74b8,...) at poll+0x2cc
    
13. syscall(cd10ad38) at syscall+0x2b3
    
14. Xint0x80_syscall() at Xint0x80_syscall+0x20
    
15. --- syscall (209, FreeBSD ELF32, poll), eip = 0x282e5b4f, esp = 0xbfbfea6c, ebp = 0xbfbfea88 ---
    

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是什么意思啊，有什么问题么？
系统版本：

1. 
   
2. $ uname -a
   
3. FreeBSD freebsd8.mymtom.cn 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Dec 24 21:28:02 CST 2007     [email]root@freebsd8.mymtom.cn[/email]:/usr/obj/usr/src/sys/GENERIC  i386
   

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