Hello.
As I have already written to this list, several of my 6.2 servers are hanging very frequently.
I've managed to turn on the following options on one of them:

options         KDB
options         DDB
options         KDB_UNATTENDED
options         INVARIANTS
options         INVARIANT_SUPPORT
options         WITNESS
options         DEBUG_LOCKS
options         DEBUG_VFS_LOCKS
options         DIAGNOSTIC

I hope I can do that soon on the others too.
In the meanwhile I have seen this in the log:

Feb 24 17:51:53 soth kernel: lock order reversal:
Feb 24 17:51:53 soth kernel: 1st 0xc6a37090 inp (divinp) @ 
/usr/src/sys/netinet/ip_divert.c:336
Feb 24 17:51:53 soth kernel: 2nd 0xc070a18c tcp (tcp) @ 
/usr/src/sys/netinet/ip_fw2.c:1982
Feb 24 17:51:53 soth kernel: KDB: stack backtrace:
Feb 24 17:51:53 soth kernel: 
kdb_backtrace(0,ffffffff,c06c8f10,c06cadb0,c0694084,...) at kdb_backtrace+0x29
Feb 24 17:51:53 soth kernel: witness_checkorder(c070a18c,9,c0665b07,7be) at 
witness_checkorder+0x578
Feb 24 17:51:53 soth kernel: _mtx_lock_flags(c070a18c,0,c0665b07,7be) at 
_mtx_lock_flags+0x78
Feb 24 17:51:53 soth kernel: check_uidgid(c6a890b0,6,c6507800,46c046c1,6e,...) 
at check_uidgid+0xdf
Feb 24 17:51:53 soth kernel: ipfw_chk(e6cc49f0,c6cfdb00,c6507800,0,0,...) at 
ipfw_chk+0xd74
Feb 24 17:51:53 soth kernel: ipfw_check_out(0,e6cc4ae8,c6507800,2,0) at 
ipfw_check_out+0xe0
Feb 24 17:51:53 soth kernel: pfil_run_hooks(c0709d40,e6cc4b5c,c6507800,2,0,...) 
at pfil_run_hooks+0xc9
Feb 24 17:51:53 soth kernel: ip_output(c6cfdb00,0,e6cc4b28,22,0,...) at 
ip_output+0x66a
Feb 24 17:51:53 soth kernel: 
div_output(c67a8000,c6cfdb00,c6b35be0,0,e6cc4c08,...) at div_output+0x185
Feb 24 17:51:53 soth kernel: div_send(c67a8000,0,c6cfdb00,c6b35be0,0,...) at 
div_send+0x3f
Feb 24 17:51:53 soth kernel:
Feb 24 17:51:53 soth kernel: 
sosend(c67a8000,c6b35be0,e6cc4c3c,c6cfdb00,0,0,c657aa80) at sosend+0x5eb
Feb 24 17:51:53 soth kernel: kern_sendit(c657aa80,3,e6cc4cbc,0,0,0) at 
kern_sendit+0x104
Feb 24 17:51:53 soth kernel: sendit(c657aa80,3,e6cc4cbc,0,bfbdebc4,...) at 
sendit+0x163
Feb 24 17:51:53 soth kernel: sendto(c657aa80,e6cc4d04) at sendto+0x4d
Feb 24 17:51:53 soth kernel: syscall(3b,3b,3b,2,34,...) at syscall+0x25b
Feb 24 17:51:53 soth kernel: Xint0x80_syscall() at Xint0x80_syscall+0x1f
Feb 24 17:51:53 soth kernel: --- syscall (133, FreeBSD ELF32, sendto), eip = 
0x2812ef43, esp = 0xbfbdeafc, ebp = 0xbfbeeba8 ---
Feb 24 17:51:53 soth kernel: ipfw: 65534 Deny TCP 192.168.0.3:52325 
193.70.192.70:110 out via xl0


Any comments?

I hope I can provide other, possibly more useful informations, in the near future.

 bye & Thanks
        av.
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