zfs recv hangs in kmem arena

[James R. Van Artsdalen]

On 10/16/2014 11:12 AM, Xin Li wrote:
> > 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).

> What does procstat -kk 1176 (or the PID of your 'zfs' process that
> stuck in that state) say?
>
> Cheers,
>
SUPERTEX:/root# ps -lp 866
UID PID PPID CPU PRI NI   VSZ   RSS MWCHAN   STAT TT      TIME COMMAND
  0 866  863   0  52  0 66800 29716 kmem are D+    1  57:40.82 zfs recv
-duvF BIGTOX
SUPERTEX:/root# procstat -kk 866
  PID    TID COMM             TDNAME           KSTACK
      866 101573 zfs              -                mi_switch+0xe1
sleepq_wait+0x3a _cv_wait+0x16d vmem_xalloc+0x568 vmem_alloc+0x3d
kmem_malloc+0x33 keg_alloc_slab+0xcd keg_fetch_slab+0x151
zone_fetch_slab+0x7e zone_import+0x40 uma_zalloc_arg+0x34e
arc_get_data_buf+0x31a arc_buf_alloc+0xaa dmu_buf_will_fill+0x169
dmu_write+0xfc dmu_recv_stream+0xd40 zfs_ioc_recv+0x94e
zfsdev_ioctl+0x5ca
SUPERTEX:/root#