Date: Sat, 28 Nov 2015 10:42:28 -0500 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: stable@freebsd.org, freebsd-fs <freebsd-fs@freebsd.org> Subject: cp from NFS to ZFS hung in "fifoor" Message-ID: <5659CB64.5020105@aldan.algebra.com>
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I was copying /home from an old server (narawntapu) to a new one
(aldan). The narawntapu:/home is mounted on aldan as /mnt with flags
ro,intr. On narawntapu /home was simply located on an SSD, but on aldan
I created a ZFS filesystem for it.
The copying was started thus:
root@aldan:/home (435) cp -Rpn /mnt/* .
for a while this was proceeding at a decent clip with cp making
newnfsreq-uests:
load: 0.78 cmd: cp 38711 [newnfsreq] 802.84r 1.57u 140.63s 20% 10768k
/mnt/mi/.kde/share/apps/kmail/dimap/.42838394.directory/sent/cur/1219621413.32392.hd8cl:2,S
->
./mi/.kde/share/apps/kmail/dimap/.42838394.directory/sent/cur/1219621413.32392.hd8cl:2,S
100%
load: 1.23 cmd: cp 38711 [newnfsreq] 874.19r 1.66u 154.74s 17% 4576k
/mnt/mi/.kde/share/apps/kmail/dimap/.42838394.directory/ML/cur/1219595347.32392.rMDFf:2,S
->
./mi/.kde/share/apps/kmail/dimap/.42838394.directory/ML/cur/1219595347.32392.rMDFf:2,S
100%
ZFS on the destination compressing and writing stuff out and the traffic
between the two ranging from 30 to 50Mb/s (according to systat), but
then something happened and the cp-process is now hung:
load: 0.55 cmd: cp 38711 [fifoor] 1107.67r 2.09u 194.12s 0% 3300k
load: 0.50 cmd: cp 38711 [fifoor] 1112.66r 2.09u 194.12s 0% 3300k
load: 0.22 cmd: cp 38711 [fifoor] 1642.37r 2.09u 194.12s 0% 3300k
There is nothing in the logs on the new system, but the old one has a
number of entries like:
Nov 28 10:28:45 narawntapu kernel: sonewconn: pcb
0xfffff80086231930: Listen queue overflow: 8 already in queue
awaiting acceptance (62 occurrences)
Nov 28 10:29:45 narawntapu kernel: sonewconn: pcb
0xfffff80086231930: Listen queue overflow: 8 already in queue
awaiting acceptance (50 occurrences)
Nov 28 10:30:46 narawntapu kernel: sonewconn: pcb
0xfffff80086231930: Listen queue overflow: 8 already in queue
awaiting acceptance (59 occurrences)
Nov 28 10:31:46 narawntapu kernel: sonewconn: pcb
0xfffff80086231930: Listen queue overflow: 8 already in queue
awaiting acceptance (57 occurrences)
Nov 28 10:32:46 narawntapu kernel: sonewconn: pcb
0xfffff80086231930: Listen queue overflow: 8 already in queue
awaiting acceptance (68 occurrences)
Both systems are largely idle now. I'm not in a hurry -- is anybody
interested in investigating it in situ? What is "fifoor" -- does this
point to a trouble in the ZFS, the NFS-client, or the NFS-server? Both
systems run FreeBSD/amd64 of recent 10.x-vintage.
Thanks!
-mi
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