[Bug 193803] zvol promote failing

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193803

--- Comment #3 from kash at tripleback.net ---
ps auxwww -O wchan:

root      2   0.0  0.0      0  1424  -  DL   Mon09am    38:58.35
[zfskern]            2 zvol:io   -  DL      38:58.35 [zfskern]
root   5452   0.0  0.0  48152  2604  -  I     2:03pm     0:00.01 sudo
zfs rename   5452 select    -  I        0:00.01 sudo zfs rename
tank/[redacted]@b7 tank/[redacted]@b6
root   5467   0.0  0.0  40048  2448  -  D     2:03pm     0:00.01 zfs
rename tank/  5467 tx->tx_s  -  D        0:00.01 zfs rename
tank/[redacted]@b7 tank/[redacted]@b6
root   5474   0.0  0.0  18724  2108  0  S+    2:05pm     0:00.00 grep
zfs          5474 piperd    0  S+       0:00.00 grep zfs

# for i in 5452 5467 ; do procstat -kk $i ; done   
  PID    TID COMM             TDNAME           KSTACK                      
 5452 101591 sudo             -                mi_switch+0xde
sleepq_catch_signals+0xb2 sleepq_wait_sig+0xf _cv_wait_sig+0x16a
seltdwait+0x96 sys_poll+0x3dc amd64_syscall+0x357 Xfast_syscall+0xfb
  PID    TID COMM             TDNAME           KSTACK                      
 5467 101597 zfs              -                mi_switch+0xde
sleepq_wait+0x3a _cv_wait+0x16d txg_wait_synced+0x85 dsl_sync_task+0x1e2
dsl_dataset_rename_snapshot+0x34 zfs_ioc_rename+0x10e zfsdev_ioctl+0x478
devfs_ioctl_f+0x11f kern_ioctl+0x22e sys_ioctl+0x11f amd64_syscall+0x357
Xfast_syscall+0xfb


Looks like no disk IO:

# iostat -t da -c 5 5
       tty            ada0             ada1             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0    58 18.25  71  1.27  18.50  70  1.27   0  0  2  0 98
   0    37  4.00   0  0.00   4.00   0  0.00   0  0  0  0 100
   0    12  4.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0    12  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0    12  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0    12  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0    12  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0    12  0.00   0  0.00   0.00   0  0.00   0  0  0  0 100

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