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

On 14 Jun 2021, at 17:17, Shawn Webb via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> 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:
>>> 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.
Hi Shawn,

Just to make sure, these object files are actually LLVM bitcode, right?
(Since you're trying to do LTO here.)

-Dimitry

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On Mon, Jun 14, 2021 at 06:22:41PM +0200, Dimitry Andric
wrote:
> On 14 Jun 2021, at 17:17, Shawn Webb via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> > 
> > 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:
> >>> 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.
> 
> Hi Shawn,
> 
> Just to make sure, these object files are actually LLVM bitcode, right?
> (Since you're trying to do LTO here.)
They are. I just figured out that we're not including llvm-ar in the
bootstrap tools stage, so we're using the system llvm-ar. We'll need
to bootstrap llvm-ar in order to be able to support the changes to
LLVM IR that are in llvm 12, but not in 11.

So it's looking like the bug I filed might be solved by including
llvm-ar in the bootstrap-tools stage. I'll update you as 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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