Date: Wed, 3 Oct 2007 21:12:15 -0700 From: "\"John Merryweather Cooper\" <John Merryweather Cooper" <john_m_cooper@yahoo.com> To: "FreeBSD gnats submit" <FreeBSD-gnats-submit@FreeBSD.org> Subject: kern/116887: Lock Order Reversal with kbd and zyd Message-ID: <1191471135.1410@borgdemon3.temp.wsu.edu> Resent-Message-ID: <200710040520.l945K4N4017363@freefall.freebsd.org>
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>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@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:
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