[Bug 204949] panic: mtx_lock of spin mutex @ /usr/src/head/sys/kern/vfs_subr.c:512

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204949

--- Comment #12 from Kirk McKusick <mckusick at FreeBSD.org> ---
The proposed fix by Mateusz Guzik is correct. Prior to my changes to vfs_subr.c
the v_mountedhere union element was always zero'ed. Following my changes it was
not. In the lookup function, it checks to see if v_mountedhere != NULL, and if
it is not NULL assumes that it points to a struct mount and passes it to
vfs_busy. If it contains a pointer to some other structure from a previous use
of the vnode, the call to vfs_busy chokes when it attempts to dereference a
mount mutex. I have committed the fix as noted in the above comment.

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