I'm doing some testing with loading up a new storage server. I have couple ZFS
filesystems exported via NFS over UDP.
I have a client machine (8.1 also) that has mounted those filesystems along
with some test PHP scripts that are doing a ton of read/write/fstat operations
to load it up.
If I ctrl-C to kill the scripts on the client I found that I can end up with
nfsd on the server stuck at 100% CPU and in the rc_lo state. /etc/rc.d/nfsd
restart does nothing.
# nfsstat -s -w 1 -W
GtAttr Lookup Rdlink Read Write Rename Access Rddir
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Client complaining with:
kernel: nfs server 192.168.1.2:/tank/alantest2: not responding
Top on the server:
last pid: 4776; load averages: 1.24, 1.15, 1.15
up 0+23:04:46 18:25:26
53 processes: 2 running, 35 sleeping, 16 lock
CPU: 0.0% user, 0.0% nice, 25.0% system, 0.0% interrupt, 75.0% idle
Mem: 21M Active, 5812K Inact, 2029M Wired, 88K Cache, 8592K Buf, 5857M Free
Swap: 3942M Total, 3942M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
922 root 44 0 5804K 1820K CPU2 2 63:52 100.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 1 30:23 0.00% {nfsd: service}
922 root 48 0 5804K 1820K rpcsvc 1 30:20 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 1 30:17 0.00% {nfsd: service}
922 root 48 0 5804K 1820K rpcsvc 1 30:17 0.00% {nfsd: service}
922 root 46 0 5804K 1820K rpcsvc 1 30:13 0.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 2 30:13 0.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 3 30:12 0.00% {nfsd: service}
922 root 44 0 5804K 1820K *rc_lo 0 30:10 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 2 30:07 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 0 30:03 0.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 1 30:03 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 2 30:03 0.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 2 30:02 0.00% {nfsd: service}
922 root 45 0 5804K 1820K *rc_lo 1 29:59 0.00% {nfsd: master}
922 root 45 0 5804K 1820K *rc_lo 2 29:54 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 0 29:54 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 0 29:52 0.00% {nfsd: service}
922 root 47 0 5804K 1820K *rc_lo 2 29:46 0.00% {nfsd: service}
922 root 46 0 5804K 1820K *rc_lo 1 29:44 0.00% {nfsd: service}
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