kern/171202: [lor] multiple LOR's during the startup

[Gleb Smirnoff]

The following reply was made to PR kern/171202; it has been noted by GNATS.

From: Gleb Smirnoff <glebius at FreeBSD.org>
To: "Eugene M. Zheganin" <emz at norma.perm.ru>
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: kern/171202: [lor] multiple LOR's during the startup
Date: Fri, 31 Aug 2012 16:30:57 +0400

 On Fri, Aug 31, 2012 at 11:21:06AM +0000, Eugene M. Zheganin wrote:
 E> --- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x800a8d6fc, rsp = 0x7fffffffccc8, rbp = 0x801009048 ---
 E> lock order reversal:
 E>  1st 0xffffffff80d50d48 PFil hook read/write mutex (PFil hook read/write mutex) @ /usr/src/sys/net/pfil.c:77
 E>  2nd 0xffffffff80d4e4f8 pcbinfohash (pcbinfohash) @ /usr/src/sys/netinet6/in6_pcb.c:1110
 ...
 E> lock order reversal:
 E>  1st 0xffffffff80d50d48 PFil hook read/write mutex (PFil hook read/write mutex) @ /usr/src/sys/net/pfil.c:77
 E>  2nd 0xfffffe00074ed168 udpinp (udpinp) @ /usr/src/sys/netinet6/in6_pcb.c:1121
 ...
 
 Just for the record: these are safe, since pfil lock is acquired as reader lock.
 
 -- 
 Totus tuus, Glebius.