Maxim Sobolev wrote:
> Any ideas?

Looks like some other processes was modifying the mountlist while
vfs_unmountall() was running.  Is this an SMP box ?  It would be nice if
you could check in gdb which other process was holding the mountlist_mtx
mutex if any.  The vfs_unmountall() function doesn't acquire the
mounstlist_mtx and states this is OK in a comment because this functions
is ran upon reboot, but I suspect this is incorrect and we still need to
do the locking.  I'll write a patch tonight to add locking into
vfs_unmountall(), but it may be hard to test unless you know of a way to
reproduce this panic easily.


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