panic in ffs_write() on RELENG_5

[Kris Kennaway]

One of my U10s running RELENG_5 panicked with the following:

panic: trap: data access error
cpuid = 0
KDB: enter: panic
[thread 100047]
Stopped at      kdb_enter+0x38: ta              %xcc, 1
db> tr
panic() at panic+0x214
trap() at trap+0x13c
-- data access error %o7=0xc014fcb8 --
copyin() at copyin+0x64
ffs_write() at ffs_write+0x338
vn_rdwr() at vn_rdwr+0xb8
vn_rdwr_inchunks() at vn_rdwr_inchunks+0x98
elf64_coredump() at elf64_coredump+0x128
sigexit() at sigexit+0x884
postsig() at postsig+0x3a4
ast() at ast+0x440
-- data access error %o7=0x109600 --

Kris
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