panic in copyin() on 5.4-R

[Kris Kennaway]

I got this during a buildworld -j8 on a quad e450 running 5.4-R.

panic: trap: data access error
cpuid = 0
KDB: enter: panic
[thread pid 27805 tid 100063 ]
Stopped at      kdb_enter+0x3c: ta              %xcc, 1
db> wh
Tracing pid 27805 tid 100063 td 0xfffff8001f77a780
panic() at panic+0x16c
trap() at trap+0x40c
-- data access error %o7=0xc0158720 --
copyin() at copyin+0x60
ffs_write() at ffs_write+0x404
vn_rdwr() at vn_rdwr+0x154
vn_rdwr_inchunks() at vn_rdwr_inchunks+0xb4
elf64_coredump() at elf64_coredump+0xe8
coredump() at coredump+0x4b8
sigexit() at sigexit+0x64
postsig() at postsig+0x154
ast() at ast+0x3bc
-- data access error %o7=0x257be7 --

Kris
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