panic: nfs sndunlock

Andriy Gapon avg at
Mon Apr 20 10:04:56 UTC 2009

System is stable/7: 7.2-PRERELEASE r191214 i386 uni-processor.

NFS mount options: ro,noauto,nfsv3,tcp,intr,rdirplus,-r=32768,-w=32768

The panic occurred on client after losing and then restoring
connectivity with NFS server. There may have been parallel access to
NFS-mounted tree at the time of the accident.

Kernel messages just before the panic:
kernel: nfs server odyssey:/usr/ports: not responding
kernel: nfs send error 57 for server odyssey:/usr/ports

kgdb information:
#0  doadump () at pcpu.h:196
#1  0xc0555a33 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2  0xc0555c7f in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3  0xc064be63 in nfs_connect_unlock (rep=0x0) at
#4  0xc064da24 in nfs_reconnect (rep=0xc40a0c80) at
#5  0xc064ff50 in nfs_request (vp=0xc4464450, mrest=0xc435a000,
procnum=3, td=0xc398cd20, cred=0xc420b800, mrp=0xdac06a04,
mdp=0xdac06a00, dposp=0xdac06a08)
    at /usr/src/sys/nfsclient/nfs_socket.c:737
#6  0xc065d3f2 in nfs_lookup (ap=0xdac06a84) at
#7  0xc0729cd6 in VOP_LOOKUP_APV (vop=0xc07a0fe0, a=0xdac06a84) at
#8  0xc05cad71 in lookup (ndp=0xdac06ba8) at vnode_if.h:57
#9  0xc05cbab8 in namei (ndp=0xdac06ba8) at
#10 0xc05db02d in kern_stat (td=0xc398cd20, path=0x2814d040 <Address
0x2814d040 out of bounds>, pathseg=UIO_USERSPACE, sbp=0xdac06c18)
    at /usr/src/sys/kern/vfs_syscalls.c:2123
#11 0xc05db21f in stat (td=0xc398cd20, uap=0xdac06cfc) at
#12 0xc0712055 in syscall (frame=0xdac06d38) at
#13 0xc06ff290 in Xint0x80_syscall () at

I am not sure why rep parameter shows up as NULL in nfs_connect_unlock
call. In frame 4:
(kgdb) p/x rep->r_nmp->nm_state
$2 = 0x10100000

I am keeping the core file.

Andriy Gapon

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