[Bug 200585] [nlm] Fatal trap 9 when printing out KASSERT trying to run umount -f on an NFS share while it's trying to print out "lockd not responding" in nlm(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200585

Konstantin Belousov <kib at FreeBSD.org> changed:

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                 CC|                            |kib at FreeBSD.org

--- Comment #4 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Peter Holm from comment #3)
Indeed, the unmount which drops the last reference on the nfs mount credentials
is the culprit.  This sole issue can be easily handled by taking additional
reference on the mnt_cred, before the vnode is unlocked.

If there are further problems from the mnt disappearing, we could try to busy
the filesystem after the vnode is unlocked.  But this would have bad
consequences for the unmount -f.  Lets try the minimal patch first.

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