FreeBSD 10 panic with "ffs_valloc: dup alloc"

[Lev Serebryakov]

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 Filesystem in question is clean after panic reboot (!)

 SU and "native" journal are used.

 Memory check is Ok.

 System is amd64, r269936.

 What could I add to this information to help track & fix this bug?

- -- 
// Lev Serebryakov AKA Black Lion
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