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Date: Wed, 27 Jul 2005 08:59:41 +0200
From: Jeremie Le Hen <jeremie@le-hen.org>
To: freebsd-current@FreeBSD.org
Message-ID: <20050727065941.GQ1610@obiwan.tataz.chchile.org>
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Subject: panic with null mount of an NFS mount
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Hi,

I just caught a panic while having null-mounted my NFS mounted CVS
repository :
    192.168.1.222:/usr/home/ncvs on /nfs/obiwan/cvs (nfs)
    /nfs/obiwan/cvs on /cvs (nullfs, local, read-only)

This is 100% reproducible, and my feeling is that this doesn't need a
kernel dump do be resolved, so I have not made a dump.

%%%
    panic: lockmgr: locking against myself
    KDB: stack backtrace:
    kdb_backtrace()
    panic()
    lockmgr(c29589e8,2002,c2959a0c,c28f1190,e732f9c0) at lockmgr+0x45d
    vop_stdlock(e732f9e8,c2958a0c,1,2002nc2958990) at vop_stdlock+0x2f
    VOP_LOCK_APV(c07841a0,e732f9e8,e732fae0,e732fae4,0) at VOP_LOCK_APV+0xb4
    vn_lock(c2958990,2002,c28f1190,7b4,c29c77b3) at vn_lock+0xec
    vrele(c2958990,0,c29c8940,27c,c2958990) at vrele+0x123
    null_reclaim(e732fa94,c28f1190,0,c2958880,e732fac0) at null_reclaim+0x7c
    VOP_RECLAIM_APV(c29c9c20,e732fa94,c28f1190,0,0) at VOP_RECLAIM_APV+0xac
    vgonel(c2958880,0,c9743654,8f1,e732fb20) at vgonel+0x1df
    vrecycle(c2958880,c28f1190,e732fb08,c07079bc,c732fb20) at vrecycle+0x4d
    null_inactive(e732fb20,c29588fc,c2958880,c29588fc,e732fb38) at null_inactive+0x23
    VOP_INACTIVE_APV(c29c9c20,e732fb20,e0743654,855,c0794bc0) at VOP_INACTIVE_APC+0xac
    vinactive(c2958880,c28f1190,c0743654,7e7,800) at vinactive+0x8b
    vput(c2958880,ffffffdf,c2586d80,0,c28f1190) at vput+0x1b2
    kern_lstat(c28f1190,8057148,0,e732fc6c,80246) at kern_lstat+0xb3
    lstat(c28f1190,e732fd04,8,422,2) at lstat+0x2f
    syscall()
    Xint0x80_syscall()
%%%

My sources are dated from 2005.07.24...

Regards,
-- 
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >