[Bug 209408] newfs cause kernel panic on powerpc64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209408

            Bug ID: 209408
           Summary: newfs cause kernel panic on powerpc64
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: ppc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: adrian.christiansen at gmail.com

While trying to install FreeBSD/powerpc64, snapshot r298793 of 11.0-CURRENT,
the kernel would panic when the installer initialized the file system:

panic: Memory modified after free 0x713a9b0(248) val=0 @ 0x713a9b0
cpuid = 0
0xc0000000002d5de0: at .kdb_backtrace+0x5c
0xc0000000002d5f10: at .vpanic+0x190
0xc0000000002d5fd0: at .panic+0x38
0xc0000000002d6060: at .trash_ctor+0x58
0xc0000000002d60e0: at .uma_zalloc_arg+0x158
0xc0000000002d6230: at .g_vfs_strategy+0xc4
0xc0000000002d62d0: at .ffs_geom_strategy+0x228
0xc0000000002d6370: at .bufwrite+0x240
0xc0000000002d6410: at .ffs_bufwrite+0x2c8
0xc0000000002d64a0: at .bawrite+0xac
0xc0000000002d6520: at .vop_stdfsync+0x1e4
0xc0000000002d6680: at .VOP_FSYNC_APV+0x148
0xc0000000002d6710: at .sched_sync+0x3c0
0xc0000000002d6850: at .fork_exit+0xd0
0xc0000000002d68f0: at .fork_trampoline+0x10
0xc0000000002d6920: at blocked_loop+0x38
KDB: enter: panic
[ thread pid 21 tid 100061 ]
Stopped at      .kdb_enter+0x60:      ld      r2, r1, 0x28,
db>

0 > _

I tried installing it again with the powerpc installer. While I ran the
powerpc64 installer again with the drive already initialized with a file system
it didn't panic. So I ran newfs from the shell and had it panic the kernel.

This is a PowerMac G5 (PowerMac9,1), running the powerpc64 installer from CD.
The panic happens for both Apple Partition Tables and DOS MBR tables.

Please let me know if there's anything I've missed or things that I can test to
help?

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