kern/116887: Lock Order Reversal with kbd and zyd

[John Merryweather Cooper]

The following reply was made to PR kern/116887; it has been noted by GNATS.

From: John Merryweather Cooper <john_m_cooper at yahoo.com>
To: FreeBSD gnats submit <FreeBSD-gnats-submit at FreeBSD.org>
Cc:  
Subject: Re: kern/116887: Lock Order Reversal with kbd and zyd
Date: Wed, 03 Oct 2007 22:28:09 -0700

 "John Merryweather Cooper" <John Merryweather Cooper wrote:
 >> Number:         116887
 >> Category:       kern
 >> Synopsis:       Lock Order Reversal with kbd and zyd
 >> Confidential:   no
 >> Severity:       non-critical
 >> Priority:       low
 >> Responsible:    freebsd-bugs
 >> State:          open
 >> Quarter:        
 >> Keywords:       
 >> Date-Required:
 >> Class:          sw-bug
 >> Submitter-Id:   current-users
 >> Arrival-Date:   Thu Oct 04 05:20:04 GMT 2007
 >> Closed-Date:
 >> Last-Modified:
 >> Originator:     John Merryweather Cooper
 >> Release:        FreeBSD 7.0-CURRENT amd64
 >> Organization:
 >> Environment:
 >>     
 >
 >
 > System: FreeBSD 7.0-CURRENT #8: Mon Oct  1 12:32:21 PDT 2007
 >     root at borgdemon3.temp.wsu.edu:/usr/obj/usr/src/sys/TURION
 >
 >
 >
 >   
 >> Description:
 >>     
 >
 >
 > Usually, when the zyd0 interface accepts a DHCP IP or roams, I get the attached lock order reversal.  Rarely, this is accompanied by a system freeze.
 >
 >
 >   
 >> How-To-Repeat:
 >>     
 >
 >
 > plugin my Belkin dongle
 >
 >
 >   
 >> Fix:
 >>     
 >
 >
 > unknown
 >
 > --- lock-order-reversal begins here ---
 > Oct  3 19:27:26 borgdemon3 kernel: lock order reversal: (Giant after non-sleepable)
 > Oct  3 19:27:26 borgdemon3 kernel: 1st 0xffffff0001674cf0 inp (udpinp) @ /usr/src/sys/netinet/in_mcast.c:670
 > Oct  3 19:27:26 borgdemon3 kernel: 2nd 0xffffffff8078e3c0 Giant (Giant) @ /usr/src/sys/netinet/in_mcast.c:317
 > Oct  3 19:27:26 borgdemon3 kernel: KDB: stack backtrace:
 > Oct  3 19:27:26 borgdemon3 kernel: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
 > Oct  3 19:27:26 borgdemon3 kernel: witness_checkorder() at witness_checkorder+0x64b
 > Oct  3 19:27:26 borgdemon3 kernel: _mtx_lock_flags() at _mtx_lock_flags+0x75
 > Oct  3 19:27:26 borgdemon3 kernel: in_addmulti() at in_addmulti+0x1e3
 > Oct  3 19:27:26 borgdemon3 kernel: inp_setmoptions() at inp_setmoptions+0x111c
 > Oct  3 19:27:26 borgdemon3 kernel: ip_ctloutput() at ip_ctloutput+0x16f
 > Oct  3 19:27:26 borgdemon3 kernel: sosetopt() at sosetopt+0x3b
 > Oct  3 19:27:26 borgdemon3 kernel: kern_setsockopt() at kern_setsockopt+0xa2
 > Oct  3 19:27:26 borgdemon3 kernel: setsockopt() at setsockopt+0x22
 > Oct  3 19:27:26 borgdemon3 kernel: syscall() at syscall+0x1ca
 > Oct  3 19:27:26 borgdemon3 kernel: Xfast_syscall() at 
 > Oct  3 19:27:26 borgdemon3 kernel: Xfast_syscall+0xab
 > Oct  3 19:27:26 borgdemon3 kernel: --- syscall (105, FreeBSD ELF64, setsockopt), rip = 0x800eb8ebc, rsp = 0x7fffffffeb18, rbp = 0x7fffffffeb90 ---
 >
 > --- lock-order-reversal ends here ---
 >
 >
 >
 >   
 >> Release-Note:
 >> Audit-Trail:
 >> Unformatted:
 >>     
 > _______________________________________________
 > freebsd-bugs at freebsd.org mailing list
 > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs
 > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe at freebsd.org"
 >
 >   
 This is a duplicate of kern/116886 (my usual mail relay is wacking out 
 on me).
 
 jmc