Dead/Live lock near VOP_LOCK1_APV?

[Xin LI]

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Hi,

I have observed a live/dead lock on a system serving both NFS and Samba
CIFS, running 8.1-STABLE.  Is this a known issue or should I investigate
further?

The system is not running with WITNESS but if further debugging is
needed I can add it.

procstat -kk shows something like:

    7 100068 zfskern          l2arc_feed_threa mi_switch
sleepq_timedwait _cv_timedwait l2arc_feed_thread fork_exit fork_trampoline
   *7 100122 zfskern          txg_thread_enter mi_switch sleepq_wait
_cv_wait txg_thread_wait txg_quiesce_thread fork_exit fork_trampoline
    7 100123 zfskern          txg_thread_enter mi_switch
sleepq_timedwait _cv_timedwait txg_thread_wait txg_sync_thread fork_exit
fork_trampoline
   *7 100184 zfskern          txg_thread_enter mi_switch sleepq_wait
_cv_wait txg_thread_wait txg_quiesce_thread fork_exit fork_trampoline
    7 100185 zfskern          txg_thread_enter mi_switch
sleepq_timedwait _cv_timedwait txg_thread_wait txg_sync_thread fork_exit
fork_trampoline

 1502 100284 nfsd             nfsd: service    mi_switch sleepq_wait
__lockmgr_args vop_stdlock VOP_LOCK1_APV _vn_lock zfs_fhtovp
nfsrv_fhtovp nfsrv_statfs nfssvc_program svc_run_internal
svc_thread_start fork_exit fork_trampoline
27663 100779 smbd             -                mi_switch sleepq_wait
__lockmgr_args vop_stdlock VOP_LOCK1_APV _vn_lock cache_lookup
vfs_cache_lookup VOP_LOOK
UP_APV lookup namei vn_open_cred kern_openat syscallenter syscall
Xfast_syscall

Full procstat -kk output can be found at:

	http://neptune.delphij.net/procstat.txt

Cheers,
- -- 
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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