clang++ core dump when building firefox

[Thomas Klausner <tk%giga.or.at@localhost>]

Hi!

When building firefox 76.0.1 on a NetBSD-7.99.60/20200506 (built with
MKLLVM=yes), I get clang++ core dumps.

I build using pbulk in an empty chroot, i.e. all packages are
up-to-date and rebuilt as of today (if modified; but no older than
May 6).

# gdb /usr/pkg/bin/clang++ work/build/layout/style/clang++.core
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Reading symbols from /usr/pkg/bin/clang++...
[New process 15693]
bt
Core was generated by `clang++'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000075bd841ab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
345     /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp: No such file or directory.
(gdb) bt
#0  0x000075bd841ab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
#1  0x000075bd828b00b0 in _opendir (name=<optimized out>) at /disk/6/archive/foreign/src/lib/libc/gen/opendir.c:72
#2  0x000000010000000b in ?? ()
#3  0x0000000000000000 in ?? ()


Same for a second one:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000075336cbab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
345     /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp: No such file or directory.
(gdb) bt
#0  0x000075336cbab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
#1  0x000075336b2b00b0 in _opendir (name=<optimized out>) at /disk/6/archive/foreign/src/lib/libc/gen/opendir.c:72
#2  0x000000010000000b in ?? ()
#3  0x0000000000000000 in ?? ()
(gdb) quit


And a third one:

[New process 29646]
Core was generated by `clang++'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007319b83ab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
345     /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp: No such file or directory.
(gdb) bt
#0  0x00007319b83ab52c in CrashRecoverySignalHandler (Signal=11)
    at /scratch/lang/llvm/work/llvm-10.0.0.src/lib/Support/CrashRecoveryContext.cpp:345
#1  0x00007319b6ab00b0 in _opendir (name=<optimized out>) at /disk/6/archive/foreign/src/lib/libc/gen/opendir.c:72
#2  0x000000010000000b in ?? ()
#3  0x0000000000000000 in ?? ()


Any ideas?
 Thomas