Re: RELENG_5 panic [nic: _mtx_lock_sleep: recursed on non-recursivemutex nfsd_mtx]

1. The NFS server code is compiled into the kernel:

   options         NFSCLIENT
   options         NFSSERVER

2. The following NFS entries are in /etc/rc.conf

   nfs_client_enable="YES"
   nfs_server_enable="NO"

3. I upgraded to:

   FreeBSD 5.3-BETA7 #3: Sun Oct 17 18:51:58 CST 2004

   and the panic hasn't happened since.

Something else to note is that IPv6 was not compiled into the kernel.

 - aW



	0n Sun, Oct 17, 2004 at 10:19:34AM -0400, Robert Watson wrote: 
	
	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 _at_ /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_at_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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