LOR in uipc_usrreq.c and kern_descrip.c

[Gleb Kozyrev]

Hello, All!

While playing with wine-20050830 I saw the following:

=========Beginning of the citation============== 
lock order reversal
 1st 0xc0971c60 unp (unp) @ /usr/src/sys/kern/uipc_usrreq.c:249
 2nd 0xc0922160 filelist lock (filelist lock) @ /usr/src/sys/kern/kern_descrip.c:2127
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c0934d08,c09346f0,c08c04cc) at kdb_backtrace+0x29
witness_checkorder(c0922160,9,c08571f2,84f) at witness_checkorder+0x564
_sx_xlock(c0922160,c08571f2,84f) at _sx_xlock+0x50
fdrop_locked(c1b41c60,0,c12f8f40,0,c08571f2) at fdrop_locked+0xa1
fdrop(c1b41c60,0,3,c15d8d80,cc8e69d4) at fdrop+0x24
closef(c1b41c60,0,c1703418,cc8e6a4c,c06762fc) at closef+0x35f
unp_discard(c1b41c60) at unp_discard+0x43
unp_scan(c1703400,c0676384) at unp_scan+0x80
unp_dispose(c1703400) at unp_dispose+0x15
sorflush(c20ac000,c20dac18,c20ac000,cc8e6b18,c067387e) at sorflush+0x119
unp_detach(c233c604,cc8e6b30,c066bb84,c20ac000,c20dac18) at unp_detach+0xc5
uipc_detach(c20ac000) at uipc_detach+0x4a
soclose(c20ac000,c20dac18,0,cc8e6b5c,c0617fb8) at soclose+0x1e0
soo_close(c20dac18,c15d8d80) at soo_close+0x4b
fdrop_locked(c20dac18,c15d8d80,c12f8ed4,0,c08571f2) at fdrop_locked+0x88
fdrop(c20dac18,c15d8d80,cc8e6ba8,c0654740,c08571f2) at fdrop+0x24
closef(c20dac18,c15d8d80) at closef+0x35f
fdfree(c15d8d80,c15fdb88,282754e4,c15d8d80,c0905500) at fdfree+0x473
exit1(c15d8d80,100,cc8e6d30,c07f22fb,c15d8d80) at exit1+0x3f6
exit1(c15d8d80,cc8e6d04,1,12b,292) at exit1
syscall(3b,3b,3b,8089200,bfbfe67c) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x281f3433, esp = 0xbfbfe2f0, ebp = 0xbfbfe30c ---
=========The end of the citation================ 

FreeBSD 6.0-BETA4 #0: Wed Sep 14, GENERIC kernel.

-- 
With best regards, Gleb Kozyrev.