Uncompressed metadata patch causes segfault

[SiegeLord]

Commit 491bc35 causes a segfault when running rustc for me. Note that the compiler is successfully built and installed at this point. My system is Linux, 64 bit. Backtrace from running just 'rustc' on the command line:

#0  open_verify (name=0x7fffffffd5c0 "/usr/local/bin/../lib/libstd-6c65cf4b443341b1-0.8-pre.so", fbp=0x7fffffffd7f0, loader=<optimized out>, 
    whatcode=<optimized out>, found_other_class=0x7fffffffd838, free_name=false) at dl-load.c:2057
#1  0x00007ffff7de0373 in open_path (name=0x4004f1 "libstd-6c65cf4b443341b1-0.8-pre.so", namelen=35, secure=0, sps=0x7ffff7ffe600, 
    realname=0x7fffffffdb40, fbp=0x7fffffffd7f0, loader=0x7ffff7ffe2e8, whatcode=4, found_other_class=0x7fffffffdb5f) at dl-load.c:2175
#2  0x00007ffff7de2a8a in _dl_map_object (loader=0x7ffff7ffe2e8, name=0x4004f1 "libstd-6c65cf4b443341b1-0.8-pre.so", type=1, trace_mode=0, mode=0, 
    nsid=0) at dl-load.c:2383
#3  0x00007ffff7de6ff2 in openaux (a=0x7fffffffddb0) at dl-deps.c:65
#4  0x00007ffff7de9186 in _dl_catch_error (objname=0x7fffffffddf0, errstring=0x7fffffffdde0, mallocedp=0x7fffffffddff, operate=0x7ffff7de6fc0 <openaux>, 
    args=0x7fffffffddb0) at dl-error.c:178
#5  0x00007ffff7de76ce in _dl_map_object_deps (map=0x7ffff7ffe2e8, preloads=<optimized out>, npreloads=<optimized out>, trace_mode=0, open_mode=0)
    at dl-deps.c:258
#6  0x00007ffff7ddd51d in dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=0x7ffff7ffe890) at rtld.c:1827
#7  0x00007ffff7defb34 in _dl_sysdep_start (start_argptr=<optimized out>, dl_main=0x7ffff7ddc6f0 <dl_main>) at ../elf/dl-sysdep.c:244
#8  0x00007ffff7ddf375 in _dl_start_final (arg=0x7fffffffe060) at rtld.c:338
#9  _dl_start (arg=0x7fffffffe060) at rtld.c:564
#10 0x00007ffff7ddb6c8 in _start () from /lib64/ld-linux-x86-64.so.2
#11 0x0000000000000001 in ?? ()
#12 0x00007fffffffe36c in ?? ()
#13 0x0000000000000000 in ?? ()

[klutzy]

cc #8745 (currenctly reverted by #8751)

[brson]

The test suite passes, so when rustc, compiletest are run as part of make check it works just fine, but when run from the command line it does this. I have no idea how to debug it.

[brson]

Fixed.