[Bug 248811] panic: deadlres_td_sleep_q: possible deadlock detected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248811

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
Looking at core.txt.8:

These prints are not the problem, but it would be nice to fix the drm driver
not to do lock asserts during panic:

WARNING !drm_modeset_is_locked(&plane->mutex) failed at
/usr/local/sys/modules/drm-current-kmod/drivers/gpu/drm/drm_atomic_helper.c:821
#0 0xffffffff82ebb673 at linux_dump_stack+0x23

It's a shame deadlkres doesn't do something like print_lockchain().  That'd
help diagnose these things.

ps shows the only find process is blocked on nfs:

    0 61433 61429 0  52  0   18540   5752 nfs      D     -      0:13.33 [find]

There are several nfscl threads sleeping on nfscl, which indicates renewthread,
i.e., probably we're waiting on a server that went away.  I'd guess that's what
find is also waiting on.

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