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jemalloc fallout for i386 on amd64?

I have an old i386 kmk binary built on 6.1

$ file kBuild/bin/netbsd.amd64/kmk 
kBuild/bin/netbsd.amd64/kmk: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked, interpreter /usr/libexec/ld.elf_so, for NetBSD 6.1.5, with debug_info, not stripped

As you might have guessed from the pathname I'm using it on amd64, b/c
I've been too lazy to build a native amd64 version.

I've just upgraded an amd64 machine to a very current current and when
I try to run that binary it segfaults with:

$ gdb -q kBuild/bin/netbsd.amd64/kmk kmk.core 
Reading symbols from kBuild/bin/netbsd.amd64/kmk...done.
[New process 1]

warning: `/usr/libexec/ld.elf_so': Shared library architecture i386:x86-64 is not compatible with target architecture i386.

warning: .dynamic section for "/usr/libexec/ld.elf_so" is not at the expected address (wrong library or version mismatch?)
Core was generated by `kmk'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0xf618abc9 in je_tcache_bin_flush_large () from /usr/lib/i386/
(gdb) bt
#0  0xf618abc9 in je_tcache_bin_flush_large () from /usr/lib/i386/
#1  0xf618b6f0 in je_tcache_event_hard () from /usr/lib/i386/
#2  0xf61f5712 in ?? () from /usr/lib/i386/
#3  0xf61f72d7 in je_arena_ralloc () from /usr/lib/i386/
#4  0xf6201f9f in realloc () from /usr/lib/i386/
#5  0x08073908 in xrealloc (ptr=0xf5910e00, size=<optimized out>)
    at kbuild/kbuild-trunk/src/kmk/misc.c:569
#6  0x08050e9d in readline (ebuf=0xfff4d42c)
    at kbuild/kbuild-trunk/src/kmk/read.c:3182
#7  0x08052cea in eval (ebuf=0xfff4d42c, set_default=1)
    at kbuild/kbuild-trunk/src/kmk/read.c:776
(gdb) x/i $eip
=> 0xf618abc9 <je_tcache_bin_flush_large+4401>: paddq  -0x138(%ebp),%xmm0
(gdb) p/x $ebp
$1 = 0xfff4cf3c
(gdb) p/x $xmm0
$2 = <unavailable>


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