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Date:      Wed, 27 Jul 2011 12:16:50 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        <freebsd-fs@FreeBSD.ORG>
Subject:   zfs process hang on pool access
Message-ID:  <A14F1C768A41483C876AD77502A864D6@multiplay.co.uk>

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Got a machine which is hung accessing a specific zfs pool, other
volumes seem unaffected, there's no errors showing on zpool status and
no errors in /var/log/messages

Processes seem to be hung in a variaty of stats including:-
STOP, zfs, zio->i, db->db, tx->tx

zfs list also hangs.

Here's some procstat -k -k <pid> from some hung processes and the output
from zfs-stats -a

The machine is running 8.2-RELEASE

procstat -k -k 94003
  PID    TID COMM             TDNAME           KSTACK
94003 100341 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100417 java             initial thread   mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait+0x5e syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100459 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100536 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100544 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 
_cv_timedwait_sig+0x134 seltdwait+0x98 poll+0x2f8 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100751 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 100925 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101268 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101319 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101417 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101486 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101498 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101555 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait_uint_private+0x64 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101563 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101565 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101566 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101804 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101897 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101971 java             -                mi_switch+0x176 sleepq_wait+0x42 _sx_xlock_hard+0x305 _sx_xlock+0x4e 
txg_hold_open+0x4f dmu_tx_assign+0x189 zfs_freebsd_create+0x2f2 VOP_CREATE_APV+0x31 vn_open_cred+0x4ab kern_openat+0x181 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 101984 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 102164 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _cv_wait_sig+0x128 
seltdwait+0x110 poll+0x2f8 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 102627 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103546 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103636 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 zio_wait+0x61 dbuf_read+0x39a 
dbuf_findbp+0xf7 dbuf_hold_impl+0xc2 dbuf_hold_level+0x1a dmu_tx_check_ioerr+0x52 dmu_tx_count_write+0x297 dmu_tx_hold_write+0x4a 
zfs_freebsd_write+0x397 VOP_WRITE_APV+0xb2 vn_write+0x2d7 dofilewrite+0x8b kern_writev+0x60 write+0x55 syscallenter+0x1e5
94003 103676 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103728 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103748 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103749 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103750 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
94003 103751 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 zio_wait+0x61 dbuf_read+0x39a 
dbuf_findbp+0xf7 dbuf_hold_impl+0xc2 dbuf_hold_level+0x1a dmu_tx_check_ioerr+0x52 dmu_tx_count_write+0x297 dmu_tx_hold_write+0x4a 
zfs_freebsd_write+0x397 VOP_WRITE_APV+0xb2 vn_write+0x2d7 dofilewrite+0x8b kern_writev+0x60 write+0x55 syscallenter+0x1e5



procstat -k -k 39568
  PID    TID COMM             TDNAME           KSTACK
39568 100303 find             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 zio_wait+0x61 dbuf_read+0x39a 
dmu_buf_hold+0xcc zap_lockdir+0x55 zap_cursor_retrieve+0x194 zfs_freebsd_readdir+0x2b6 kern_getdirentries+0x217 getdirentries+0x23 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2



zfs-stats -a
------------------------------------------------------------------------
ZFS Subsystem Report                            Wed Jul 27 10:57:12 2011
------------------------------------------------------------------------
System Information:

        Kernel Version:                         802000 (osreldate)
        Hardware Platform:                      amd64
        Processor Architecture:                 amd64

FreeBSD 8.2-RELEASE #0: Fri Mar 18 10:58:44 UTC 2011 root
10:57AM  up 112 days, 21 mins, 1 user, load averages: 0.56, 0.39, 0.34
------------------------------------------------------------------------
System Memory Statistics:
        Physical Memory:                        24555.62M
        Kernel Memory:                          2076.86M
        DATA:                           99.50%  2066.54M
        TEXT:                           0.50%   10.32M
------------------------------------------------------------------------
ZFS pool information:
        Storage pool Version (spa):             15
        Filesystem Version (zpl):               4
------------------------------------------------------------------------
ARC Misc:
        Deleted:                                122887476
        Recycle Misses:                         2985802
        Mutex Misses:                           51968
        Evict Skips:                            51968

ARC Size:
        Current Size (arcsize):         12.50%  2847.37M
        Target Size (Adaptive, c):      12.50%  2847.48M
        Min Size (Hard Limit, c_min):   12.50%  2847.48M
        Max Size (High Water, c_max):   ~8:1    22779.81M

ARC Size Breakdown:
        Recently Used Cache Size (p):   29.47%  839.09M
        Freq. Used Cache Size (c-p):    70.53%  2008.38M

ARC Hash Breakdown:
        Elements Max:                           1093246
        Elements Current:               34.92%  381795
        Collisions:                             496215463
        Chain Max:                              11
        Chains:                                 86474

ARC Eviction Statistics:
        Evicts Total:                           2581704887296
        Evicts Eligible for L2:         93.73%  2419921712128
        Evicts Ineligible for L2:       6.27%   161783175168
        Evicts Cached to L2:                    0

ARC Efficiency:
        Cache Access Total:                     17042848480
        Cache Hit Ratio:                99.85%  17017691729
        Cache Miss Ratio:               0.15%   25156751
        Actual Hit Ratio:               88.30%  15049590290

        Data Demand Efficiency:         99.90%
        Data Prefetch Efficiency:       86.74%

        CACHE HITS BY CACHE LIST:
          Anonymously Used:             11.48%  1952878601
          Most Recently Used (mru):     5.30%   901233481
          Most Frequently Used (mfu):   83.14%  14148356809
          MRU Ghost (mru_ghost):        0.03%   5560514
          MFU Ghost (mfu_ghost):        0.06%   9662324

        CACHE HITS BY DATA TYPE:
          Demand Data:                  65.68%  11176417108
          Prefetch Data:                0.26%   44828929
          Demand Metadata:              6.89%   1173279354
          Prefetch Metadata:            27.17%  4623166338

        CACHE MISSES BY DATA TYPE:
          Demand Data:                  44.65%  11232287
          Prefetch Data:                27.24%  6852876
          Demand Metadata:              23.17%  5829877
          Prefetch Metadata:            4.94%   1241711
------------------------------------------------------------------------
VDEV Cache Summary:
        Access Total:                           6646743
        Hits Ratio:                     67.29%  4472518
        Miss Ratio:                     32.71%  2174225
        Delegations:                            350939
------------------------------------------------------------------------
File-Level Prefetch Stats (DMU):

DMU Efficiency:
        Access Total:                           119890457768
        Hit Ratio:                      91.27%  109423001264
        Miss Ratio:                     8.73%   10467456504

        Colinear Access Total:                  10467456504
        Colinear Hit Ratio:             0.01%   632312
        Colinear Miss Ratio:            99.99%  10466824192

        Stride Access Total:                    107333142359
        Stride Hit Ratio:               99.99%  107326197075
        Stride Miss Ratio:              0.01%   6945284

DMU misc:
        Reclaim successes:                      2967491512
        Reclaim failures:                       7499332680
        Stream resets:                          58396
        Stream noresets:                        1273657946
        Bogus streams:                          0
------------------------------------------------------------------------
ZFS Tunable (sysctl):
        kern.maxusers=384
        vfs.zfs.l2c_only_size=0
        vfs.zfs.mfu_ghost_data_lsize=495015424
        vfs.zfs.mfu_ghost_metadata_lsize=96888320
        vfs.zfs.mfu_ghost_size=591903744
        vfs.zfs.mfu_data_lsize=17817088
        vfs.zfs.mfu_metadata_lsize=286173184
        vfs.zfs.mfu_size=563621376
        vfs.zfs.mru_ghost_data_lsize=1540046336
        vfs.zfs.mru_ghost_metadata_lsize=849328128
        vfs.zfs.mru_ghost_size=2389374464
        vfs.zfs.mru_data_lsize=232126464
        vfs.zfs.mru_metadata_lsize=118643712
        vfs.zfs.mru_size=531284992
        vfs.zfs.anon_data_lsize=0
        vfs.zfs.anon_metadata_lsize=0
        vfs.zfs.anon_size=68533248
        vfs.zfs.l2arc_norw=1
        vfs.zfs.l2arc_feed_again=1
        vfs.zfs.l2arc_noprefetch=0
        vfs.zfs.l2arc_feed_min_ms=200
        vfs.zfs.l2arc_feed_secs=1
        vfs.zfs.l2arc_headroom=2
        vfs.zfs.l2arc_write_boost=8388608
        vfs.zfs.l2arc_write_max=8388608
        vfs.zfs.arc_meta_limit=5971591168
        vfs.zfs.arc_meta_used=2665786824
        vfs.zfs.mdcomp_disable=0
        vfs.zfs.arc_min=2985795584
        vfs.zfs.arc_max=23886364672
        vfs.zfs.zfetch.array_rd_sz=1048576
        vfs.zfs.zfetch.block_cap=256
        vfs.zfs.zfetch.min_sec_reap=2
        vfs.zfs.zfetch.max_streams=8
        vfs.zfs.prefetch_disable=0
        vfs.zfs.check_hostid=1
        vfs.zfs.recover=0
        vfs.zfs.txg.write_limit_override=0
        vfs.zfs.txg.synctime=5
        vfs.zfs.txg.timeout=30
        vfs.zfs.scrub_limit=10
        vfs.zfs.vdev.cache.bshift=16
        vfs.zfs.vdev.cache.size=10485760
        vfs.zfs.vdev.cache.max=16384
        vfs.zfs.vdev.aggregation_limit=131072
        vfs.zfs.vdev.ramp_rate=2
        vfs.zfs.vdev.time_shift=6
        vfs.zfs.vdev.min_pending=4
        vfs.zfs.vdev.max_pending=10
        vfs.zfs.cache_flush_disable=0
        vfs.zfs.zil_disable=0
        vfs.zfs.zio.use_uma=0
        vfs.zfs.version.zpl=4
        vfs.zfs.version.spa=15
        vfs.zfs.version.dmu_backup_stream=1
        vfs.zfs.version.dmu_backup_header=2
        vfs.zfs.version.acl=1
        vfs.zfs.debug=0
        vfs.zfs.super_owner=0
        vm.kmem_size=24960106496
        vm.kmem_size_scale=1
        vm.kmem_size_min=0
        vm.kmem_size_max=329853485875
------------------------------------------------------------------------


procstat -k -k 36541
  PID    TID COMM             TDNAME           KSTACK
36541 100971 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101251 java             initial thread   mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait+0x5e syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101591 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101648 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101781 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101798 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 101993 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102037 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102059 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102191 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait_uint_private+0x64 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102208 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102210 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102221 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102253 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102279 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102298 java             -                mi_switch+0x176 sleepq_wait+0x42 _sx_xlock_hard+0x305 _sx_xlock+0x4e 
txg_hold_open+0x4f dmu_tx_assign+0x189 zfs_freebsd_create+0x2f2 VOP_CREATE_APV+0x31 vn_open_cred+0x4ab kern_openat+0x181 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102426 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102594 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 zio_wait+0x61 
dmu_buf_hold_array_by_dnode+0x217 dmu_buf_hold_array+0x6a dmu_read_uio+0x3f zfs_freebsd_read+0x5d3 vn_read+0x2cc dofileread+0xa1 
kern_readv+0x60 read+0x55 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 102775 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 103293 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 103790 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 103791 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36541 103797 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 zio_wait+0x61 dbuf_read+0x39a 
dmu_buf_hold+0xcc zap_lockdir+0x55 zap_lookup_norm+0x45 zap_lookup+0x2e zfs_dirent_lock+0x534 zfs_dirlook+0x69 zfs_lookup+0x26b 
zfs_freebsd_lookup+0x81 vfs_cache_lookup+0xf0 VOP_LOOKUP_APV+0x40 lookup+0x452 namei+0x53a kern_statat_vnhook+0x8f
36541 103809 java             -                mi_switch+0x176 sleepq_wait+0x42 __lockmgr_args+0x75a vop_stdlock+0x39 
VOP_LOCK1_APV+0x46 _vn_lock+0x47 vget+0x70 cache_lookup+0x50f vfs_cache_lookup+0xc0 VOP_LOOKUP_APV+0x40 lookup+0x452 namei+0x53a 
vn_open_cred+0x3ac kern_openat+0x181 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2



 procstat -k -k 36732
  PID    TID COMM             TDNAME           KSTACK
36732 100369 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100790 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100794 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100830 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100853 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100873 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100957 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 100977 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 101124 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait_uint_private+0x64 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 101130 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 101190 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 101326 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_cv_wait+0x871 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 102146 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 102257 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 102316 java             -                mi_switch+0x176 sleepq_wait+0x42 _sx_xlock_hard+0x305 _sx_xlock+0x4e 
txg_hold_open+0x4f dmu_tx_assign+0x189 zfs_freebsd_create+0x2f2 VOP_CREATE_APV+0x31 vn_open_cred+0x4ab kern_openat+0x181 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 102484 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 dmu_buf_hold_array_by_dnode+0x28f 
dmu_buf_hold_array+0x6a dmu_read_uio+0x3f zfs_freebsd_read+0x5d3 vn_read+0x2cc dofileread+0xa1 kern_readv+0x60 read+0x55 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 102943 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _cv_wait_sig+0x128 
seltdwait+0x110 poll+0x2f8 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 103102 java             initial thread   mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_wait_sig+0x16 _sleep+0x269 
do_wait+0x72a __umtx_op_wait+0x5e syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 103255 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 _sleep+0x1b1 
do_cv_wait+0x640 __umtx_op_cv_wait+0x5c syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 103292 java             -                mi_switch+0x176 sleepq_catch_signals+0x31c sleepq_timedwait_sig+0x19 
_cv_timedwait_sig+0x134 seltdwait+0x98 poll+0x2f8 syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
36732 103481 java             -                mi_switch+0x176 sleepq_wait+0x42 _cv_wait+0x129 dmu_buf_hold_array_by_dnode+0x28f 
dmu_buf_hold_array+0x6a dmu_read_uio+0x3f zfs_freebsd_read+0x5d3 vn_read+0x2cc dofileread+0xa1 kern_readv+0x60 read+0x55 
syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2 


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