[Bug libfortran/64732] [5 Regression] julia build failure: double free or corruption in libgfortran.so.3

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64732

--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to ktkachov from comment #2)
> (In reply to Richard Biener from comment #1)
> > Waiting for some kind of a testcase (or at least a pointer to what Julia is).
> 
> Judging by the .jl suffix, I'd think it's this:
> http://julialang.org/

Yes.

Here's another backtrace:

======= Backtrace: =========
/lib/libc.so.6(+0x73fbe)[0x7f3682997fbe]
/lib/libc.so.6(+0x7973d)[0x7f368299d73d]
/lib/libc.so.6(+0x79f4b)[0x7f368299df4b]
/usr/lib/gcc/x86_64-pc-linux-gnu/5.0.0/libgfortran.so.3(+0xe6aa6)[0x7f366f954aa6]
/usr/lib/gcc/x86_64-pc-linux-gnu/5.0.0/libgfortran.so.3(+0xe6bb2)[0x7f366f954bb2]
/usr/lib/gcc/x86_64-pc-linux-gnu/5.0.0/libgfortran.so.3(+0x1a7f9)[0x7f366f8887f9]
/lib64/ld-linux-x86-64.so.2(+0xf927)[0x7f368399a927]
/lib/libc.so.6(+0x3686a)[0x7f368295a86a]
/lib/libc.so.6(+0x368b5)[0x7f368295a8b5]
/lib/libc.so.6(__libc_start_main+0xf7)[0x7f3682943fd7]
/var/tmp/julia/usr/bin/julia[0x4014d5]

addr2line shows:

libgfortran/io/unit.c:718 : 718   free_format_hash_table (u);
libgfortran/io/unit.c:764
libgfortran/runtime/main.c:292

Don't know how to come up with a small testcase yet.