Date: Sun, 1 Mar 1998 10:36:38 -0500 (EST) From: Brian Tao <taob@nbc.netcom.ca> To: FREEBSD-CURRENT <freebsd-current@FreeBSD.ORG> Subject: Lockup in inode/nfsrcv on loopback NFS mount Message-ID: <Pine.GSO.3.95.980228233143.22812B-100000@tor-adm1>
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Could someone with a recent -current (I'm using Feb 28's) try
exporting a filesystem, mounting it via localhost and copying a large
file (a few megabytes will do) to the NFS-mounted filesystem? I've
seen results from only NFS locking up, to all filesystems hanging, to
the entire system freezing.
| # showmount -e
| Exports list on localhost:
| /usr/local Everyone
|
| # mount localhost:/usr/local /mnt
| # df
| Filesystem 1K-blocks Used Avail Capacity Mounted on
| /dev/sd0a 98479 19940 70661 22% /
| /dev/sd0s2e 148703 71996 64811 53% /usr
| /dev/sd0s2f 73855 7499 60448 11% /var
| /dev/sd0s2g 1525999 781757 622163 56% /usr/local
| /dev/sd0s2h 762991 235510 466442 34% /usr/X11R6
| /dev/sd0s2d 452948 216517 200196 52% /home
| procfs 4 4 0 100% /proc
| localhost:/usr/local 1525999 781757 622163 56% /mnt
|
| # cd /mnt/tmp
| # dd if=/dev/zero of=blah
| ^C^C^C^C
At this point, the NFS server processes are waiting in inode, and
the client processes are waiting in either getblk or nfsrcv. Syslog
does manage to log a few "/kernel: nfs server localhost:/usr/local: not
responding". The first sync(8) command (if I can get to a shell) will
never exit (waiting on nfsrcv). A truss on the hung process shows the
last call was a write().
I don't have another machine here to try NFS over Ethernet, nor a
machine with a different -current to try another loopback NFS mount.
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
0 0 0 0 -18 0 0 0 sched DLs ?? 0:00.01 (swapper)
0 1 0 0 10 0 484 132 wait Is ?? 0:00.03 /sbin/init --
0 2 0 0 -18 0 0 0 psleep DL ?? 0:01.12 (pagedaemon)
0 3 0 0 28 0 0 0 psleep DL ?? 0:00.00 (vmdaemon)
0 4 0 0 28 0 0 0 update DL ?? 0:00.03 (update)
0 100 1 0 2 0 768 360 select Is ?? 0:00.10 syslogd
1 110 1 0 2 0 752 320 select Is ?? 0:00.01 portmap
0 118 1 0 2 0 464 148 select Is ?? 0:00.02 mountd -r
0 121 1 25 2 0 312 64 accept Is ?? 0:00.01 nfsd: master (nfsd)
0 125 121 0 -14 0 292 44 inode D ?? 0:00.00 nfsd: server (nfsd)
0 126 121 0 -14 0 292 44 inode D ?? 0:00.00 nfsd: server (nfsd)
0 127 121 19 -1 0 292 44 nfsrcv D ?? 0:02.03 nfsd: server (nfsd)
0 128 121 5 -14 0 292 44 inode D ?? 0:01.35 nfsd: server (nfsd)
0 132 1 9 2 0 204 16 sbwait D ?? 0:01.11 nfsiod -n 4
0 133 1 0 -1 0 204 16 nfsrcv D ?? 0:00.74 nfsiod -n 4
0 134 1 0 -1 0 204 16 nfsrcv D ?? 0:00.00 nfsiod -n 4
0 135 1 0 -1 0 204 16 nfsrcv D ?? 0:00.00 nfsiod -n 4
0 150 1 0 10 0 920 404 nanslp Is ?? 0:00.04 cron
0 154 1 77 18 0 1144 392 pause Is ?? 0:00.01 /usr/sbin/sendmail -q30m
0 196 1 59 2 0 1004 324 accept Is ?? 0:02.23 /usr/local/sbin/sshd
0 252 251 1 2 0 3516 1188 select Ss ?? 0:01.86 SCREEN (screen)
1000 253 252 0 18 0 1304 676 pause Is p1 0:00.34 -usr/local/bin/tcsh
1000 269 253 5 10 0 760 308 piocwa I+ p1 0:00.12 truss cp yamato.the-birth.mp3 blah
1000 270 269 8 -5 0 272 40 getblk D+ p1 0:00.19 cp yamato.the-birth.mp3
1000 255 252 5 18 0 1300 548 pause Is p2 0:00.28 -usr/local/bin/tcsh
1000 257 255 1 2 0 1512 564 select S+ p2 0:01.93 top
1000 256 252 0 18 0 1308 944 pause Ss p3 0:00.55 -usr/local/bin/tcsh
1000 273 256 1 -1 0 136 8 nfsrcv D p3 0:00.01 sync
1000 298 256 1 28 0 668 276 - R+ p3 0:00.00 ps -lax
--
Brian Tao (BT300, taob@netcom.ca)
"Though this be madness, yet there is method in't"
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