kern/116887: Lock Order Reversal with kbd and zyd

["John Merryweather Cooper" <John Merryweather Cooper]

>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: