zfs recv hangs in kmem arena
Xin Li
delphij at delphij.net
Thu Oct 16 16:12:35 UTC 2014
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On 10/16/14 4:25 AM, James R. Van Artsdalen wrote:
> The zfs recv / kmem arena hang happens with -CURRENT as well as
> 10-STABLE, on two different systems, with 16GB or 32GB of RAM,
> from memstick or normal multi-user environments,
>
> Hangs usually seem to hapeen 1TB to 3TB in, but last night one run
> hung after only 4.35MB.
>
> On 9/26/2014 1:42 AM, James R. Van Artsdalen wrote:
>> FreeBSD BLACKIE.housenet.jrv 10.1-BETA2 FreeBSD 10.1-BETA2 #2
>> r272070M: Wed Sep 24 17:36:56 CDT 2014
>> james at BLACKIE.housenet.jrv:/usr/obj/usr/src/sys/GENERIC amd64
>>
>> With current STABLE10 I am unable to replicate a ZFS pool using
>> zfs send/recv without zfs hanging in state "kmem arena", within
>> the first 4TB or so (of a 23TB Pool).
>>
>> The most recent attempt used this command line
>>
>> SUPERTEX:/root# zfs send -R BIGTEX/UNIX at syssnap | ssh BLACKIE zfs
>> recv -duvF BIGTOX
>>
>> though local replications fail in kmem arena too.
>>
>> The two machines I've been attempting this on have 16BG and 32GB
>> of RAM each and are otherwise idle.
>>
>> Any suggestions on how to get around, or investigate, "kmem
>> arena"?
>>
>> # top last pid: 3272; load averages: 0.22, 0.22, 0.23
>> up 0+08:25:02 01:32:07 34 processes: 1 running, 33 sleeping
>> CPU: 0.0% user, 0.0% nice, 0.1% system, 0.0% interrupt, 99.9%
>> idle Mem: 21M Active, 82M Inact, 15G Wired, 28M Cache, 450M Free
>> ARC: 12G Total, 24M MFU, 12G MRU, 23M Anon, 216M Header, 47M
>> Other Swap: 16G Total, 16G Free
>>
>> PID USERNAME THR PRI NICE SIZE RES STATE C TIME
>> WCPU COMMAND 1173 root 1 52 0 86476K 7780K select
>> 0 124:33 0.00% sshd 1176 root 1 46 0 87276K 47732K
>> kmem a 3 48:36 0.00% zfs 968 root 32 20 0 12344K
>> 1888K rpcsvc 0 0:13 0.00% nfsd 1009 root 1 20 0
>> 25452K 2864K select 3 0:01 0.00% ntpd ...
What does procstat -kk 1176 (or the PID of your 'zfs' process that
stuck in that state) say?
Cheers,
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