[llvm-dev] llvm 12 regression bug with llvm-ar

[Shawn Webb via llvm-dev]

Hey all,

As a little bit of background, HardenedBSD compiles (nearly) the whole
operating system (static/shared libraries and applications) with LTO.
HardenedBSD is a derivative of FreeBSD that follows FreeBSD very
closely (we merge in changes from FreeBSD every six hours).

Over the weekend, FreeBSD merged in llvm 12 (upgrading from llvm 11).
We've found at least one regression with llvm-ar. Below is the log of
the llvm error output. I'm sure you all will need more context, so
please let me know how I can help in that regard.

==== BEGIN LOG ====
===> lib/libzstd (obj,all,install)
building static zstd library
ar rcv libprivatezstd.a entropy_common.o error_private.o fse_decompress.o pool.o threading.o xxhash.o zstd_common.o fse_compress.o huf_compress.o zstd_compress.o zstd_compress_literals.o zstd_compress_sequences.o zstd_compress_superblock.o zstdmt_compress.o huf_decompress.o zstd_ddict.o zstd_decompress.o zstd_decompress_block.o zbuff_common.o zbuff_compress.o zbuff_decompress.o cover.o divsufsort.o zdict.o zstd_fast.o zstd_lazy.o zstd_ldm.o zstd_opt.o zstd_double_fast.o debug.o hist.o fastcover.o  
Assertion failed: ((Record[i] == 5 || Record[i] == 6) && "Invalid attribute group entry"), function parseAttributeGroupBlock, file /usr/src/contrib/llvm-project/llvm/lib/Bitcode/Reader/BitcodeReader.cpp, line 1645.
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace.
Stack dump:
0.      Program arguments: ar rcv libprivatezstd.a entropy_common.o error_private.o fse_decompress.o pool.o threading.o xxhash.o zstd_common.o fse_compress.o huf_compress.o zstd_compress.o zstd_compress_literals.o zstd_compress_sequences.o zstd_compress_superblock.o zstdmt_compress.o huf_decompress.o zstd_ddict.o zstd_decompress.o zstd_decompress_block.o zbuff_common.o zbuff_compress.o zbuff_decompress.o cover.o divsufsort.o zdict.o zstd_fast.o zstd_lazy.o zstd_ldm.o zstd_opt.o zstd_double_fast.o debug.o hist.o fastcover.o 
#0 0x0000010ea28e6f86 llvm::sys::PrintStackTrace(llvm::raw_ostream&) /usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
#1 0x0000010ea28e4de1 llvm::sys::RunSignalHandlers() /usr/src/contrib/llvm-project/llvm/lib/Support/Signals.cpp:69:18
#2 0x0000010ea28e7815 SignalHandler /usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#3 0x000003a50c98161e handle_signal /usr/src/lib/libthr/thread/thr_sig.c:0:3
==== END LOG ====

Thanks,

-- 
Shawn Webb
Cofounder / Security Engineer
HardenedBSD

https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc
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