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panic on unmount: possible double free


I just wanted to reboot a Xen3-amd64 Dom0 kernel and paniced:

unmounting / (/dev/wd0a)...panic: free 2: inuse 0, proable double free
Stopped in pid 559.1 (reboot) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x25e
free() at netbsd:free+0x283
ffs_unmount() at netbsd:ffs_unmount+0x18b
dounmount() at netbsd:dounmount+0x11f
vfs_unmountall() at netbsd:vfs_unmountall+0x7c
cpu_reboot() at netbsd:cpu_reboot+0xdc
sys_reboot() at netbsd:sys_reboot+0x52
syscall() at netbsd:syscall+0x9a

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