[Bug 231117] I/O lockups inside bhyve vms

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231117

--- Comment #13 from Kristian K. Christensen <kkc at duckpond.dk> ---
(In reply to Kristian K. Christensen from comment #12)

So success - procstats below. Is there anything else that would be helpful?

zfskern:

  PID    TID COMM                TDNAME              KSTACK                     
    5 100034 zfskern             arc_reclaim_thread  mi_switch+0xe6
sleepq_timedwait+0x2f _cv_timedwait_sbt+0x18c arc_reclaim_thread+0x286
fork_exit+0x83 fork_trampoline+0xe 
    5 100035 zfskern             arc_dnlc_evicts_thr mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e arc_dnlc_evicts_thread+0xff fork_exit+0x83
fork_trampoline+0xe 
    5 100037 zfskern             dbuf_evict_thread   mi_switch+0xe6
sleepq_timedwait+0x2f _cv_timedwait_sbt+0x18c dbuf_evict_thread+0x127
fork_exit+0x83 fork_trampoline+0xe 
    5 100054 zfskern             l2arc_feed_thread   mi_switch+0xe6
sleepq_timedwait+0x2f _cv_timedwait_sbt+0x18c l2arc_feed_thread+0x2e9
fork_exit+0x83 fork_trampoline+0xe 
    5 100302 zfskern             trim zroot          mi_switch+0xe6
sleepq_timedwait+0x2f _cv_timedwait_sbt+0x18c trim_thread+0xab fork_exit+0x83
fork_trampoline+0xe 
    5 100320 zfskern             txg_thread_enter    mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e txg_quiesce+0x17b txg_quiesce_thread+0x166
fork_exit+0x83 fork_trampoline+0xe 
    5 100321 zfskern             txg_thread_enter    mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e txg_sync_thread+0x1cb fork_exit+0x83
fork_trampoline+0xe 
    5 100322 zfskern             solthread 0xfffffff mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e zthr_procedure+0x9b fork_exit+0x83
fork_trampoline+0xe 
    5 100323 zfskern             solthread 0xfffffff mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e zthr_procedure+0x9b fork_exit+0x83
fork_trampoline+0xe 

pkg upgrade -fy (what got it to lock up this time):
  PID    TID COMM                TDNAME              KSTACK                     
15809 100406 pkg                 -                   mi_switch+0xe6
sleepq_catch_signals+0x40c sleepq_wait_sig+0xf _sleep+0x231 kern_wait6+0x4cd
sys_wait4+0x78 amd64_syscall+0xa38 fast_syscall_common+0x101 

(the second process):
  PID    TID COMM                TDNAME              KSTACK                     
15810 100344 pkg                 -                   mi_switch+0xe6
sleepq_wait+0x2c _cv_wait+0x16e zil_commit_impl+0xdeb zfs_freebsd_fsync+0xa7
VOP_FSYNC_APV+0x82 kern_fsync+0x1c3 amd64_syscall+0xa38
fast_syscall_common+0x101

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