panic, seems related to r234386

I got this with today's current, previous (working) kernel is r232719.

panic: _mtx_lock_sleep: recursed on non-recursive mutex struct mount mtx
_at_ /frontier/svn/head/sys/kern/vfs_subr.c:4595

FWIW I'm using ufs2, ext2fs, and msdosfs on this system. The panic
occurred right after loading the linux kernel module, but I'm not 100%
sure that's related. Full core.txt.0 is in my home directory on freefall.

#0  doadump (textdump=1) at /frontier/svn/head/sys/kern/kern_shutdown.c:268
268             if (textdump && textdump_pending) {
(kgdb) #0  doadump (textdump=1) at
/frontier/svn/head/sys/kern/kern_shutdown.c:268
#1  0xffffffff80482999 in kern_reboot (howto=260)
    at /frontier/svn/head/sys/kern/kern_shutdown.c:454
#2  0xffffffff804823ca in panic (fmt=0x0)
    at /frontier/svn/head/sys/kern/kern_shutdown.c:642
#3  0xffffffff80471c25 in _mtx_lock_sleep (m=Variable "m" is not available.
)
    at /frontier/svn/head/sys/kern/kern_mutex.c:363
#4  0xffffffff80471cb0 in _mtx_lock_flags (m=Variable "m" is not available.
)
    at /frontier/svn/head/sys/kern/kern_mutex.c:212
#5  0xffffffff80517353 in __mnt_vnode_first_all (mvp=0xffffff819e9f0a58,
    mp=0xfffffe00051dc310) at /frontier/svn/head/sys/kern/vfs_subr.c:4595
#6  0xffffffff8042bdd5 in ext2_sync (mp=0xfffffe00051dc310, waitfor=2)
    at /frontier/svn/head/sys/fs/ext2fs/ext2_vfsops.c:835
#7  0xffffffff80521446 in sys_sync (td=Variable "td" is not available.
)
    at /frontier/svn/head/sys/kern/vfs_syscalls.c:150
#8  0xffffffff806b1d52 in amd64_syscall (td=0xfffffe0005149480, traced=0)
    at subr_syscall.c:135
#9  0xffffffff8069d697 in Xfast_syscall ()
    at /frontier/svn/head/sys/amd64/amd64/exception.S:387
#10 0x00000008008b061c in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)


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