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Date: Sun, 17 Oct 2004 10:19:34 -0400 (EDT)
From: Robert Watson <rwatson@freebsd.org>
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To: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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cc: freebsd-current@freebsd.org
Subject: Re: RELENG_5 panic [nic: _mtx_lock_sleep: recursed on
	non-recursivemutex nfsd_mtx]
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On Fri, 15 Oct 2004, Wilkinson, Alex wrote:

> Hi all,
> 
> I currently get a panic with "nfs_server_enable=YES" in /etc/rc.conf.
> 
> OS: FreeBSD 5.3-BETA4 #2: Tue Sep 14 13:55:30 UTC 2004
> 
> Backtrace
> ---------
> 
> panic: _mtx_lock_sleep: recursed on non-recursive mutex nfsd_mtx @ /usr /src/sys/nfsserver/nfs_serv.c:1947

Is the NFS server code compiled into your kernel, or is it getting loaded
as a module?  Do you have any other NFS-related entries in /etc/rc.conf?
Could you show the output of "show locks" and "show witness" with witness
compiled into the kernel?

Thanks!

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research


> cpuid = 0
> KDB: enter: panic
> [thread 100074]
> Stopped at      kdb_enter+0x32: leave
> db> tr
> kdb_enter(c068ba66,0,c068aed8,dd2ed90c,c1b6b340) at kdb_enter+0x32
> panic(c068aed8,c069885f,c0698617,79b,c0698617) at panic+0x1b0
> _mtx_lock_sleep(c071c940,c1b6b340,0,c0698617,79b) at _mtx_lock_sleep+0x16e
> _mtx_lock_flags(c071c940,0,c0698617,79b,0) at _mtx_lock_flags+0xb0
> nfsrv_create(c1eb6800,c1b98800,c1b6b340,dd2edc8c,0) at nfsrv_create+0x8c4
> nfssvc(c1b6b340,dd2edd14,8,0,2) at nfssvc+0x6ea
> syscall(2f,2f,2f,0,0) at syscall+0x13b
> Xint0x80_syscall() at Xint0x80_syscall+0x1f
> --- syscall (155, FreeBSD ELF32, nfssvc), eip = 0x280c60bf, esp = 0xbfbfeb1c, eb p = 0xbfbfeb38 ---
> 
> 
>  - aW
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