llvm dev - Jun 2021 - llvm 12 regression bug with llvm-ar

On 6/14/21 5:31 AM, Shawn Webb via llvm-dev wrote:
> 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.
> 

Can you file a bug for this and put release-12.0.1 in the blocks field.

We are getting close to the release, so there may not be enough time to
fix this, but I would like to track this bug anyway.

-Tom

> ==== 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,
> 
> 
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> llvm-dev at lists.llvm.org
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>

On Mon, Jun 14, 2021 at 07:45:06AM -0700, Tom Stellard
wrote:
> On 6/14/21 5:31 AM, Shawn Webb via llvm-dev wrote:
> > 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.
> > 
> 
> 
> Can you file a bug for this and put release-12.0.1 in the blocks field.
> 
> We are getting close to the release, so there may not be enough time to
> fix this, but I would like to track this bug anyway.
Thanks for the response! I've filed a bug report here:
https://bugs.llvm.org/show_bug.cgi?id=50706

I'm going to try to figure out which specific object file is causing
llvm-ar to crash. I'll report back when I know more.

Thanks,

-- 
Shawn Webb
Cofounder / Security Engineer
HardenedBSD

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