Re: LLVM broken on main (arm64)?

On 27 Jul 2025, at 13:33, Lexi Winter <ivy@freebsd.org> wrote:
> 
> Dimitry Andric:
>> On 27 Jul 2025, at 12:44, Herbert J. Skuhra <herbert@gojira.at> wrote:
>>> 
>>> after updating from main-n279078-1f2c178e5688 to
>>> main-n279105-9b3055d0d4bc (arm64) I have the following issue:
>>> 
>>> $ cc
>>> PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
>>> Stack dump:
>>> 0.      Program arguments: cc
>>> 1.      Compilation construction
>>> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
>>> 0  libprivatellvm.so.19 0x00000edc041485ec llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 72
>>> 1  libprivatellvm.so.19 0x00000edc041464ec llvm::sys::RunSignalHandlers() + 128
>>> 2  libprivatellvm.so.19 0x00000edc04148d48 llvm::support::detail::provider_format_adapter<int>::format(llvm::raw_ostream&, llvm::StringRef) + 412
>>> 3  libthr.so.3          0x00000edc06bafc38 _pthread_sigmask + 1320
>>> Segmentation fault
>> 
>> That's a very short trace, with no useful information. Maybe installworld was half-finished?
> 
> i am seeing something similar on amd64 after updating past 9b3055d0d4bc:
> 
> 1& 1? 172!freebsd15 ~/src/bsd/dev [lf/dev/pkgbase-toolchain]% cc
> 
> PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed source, and associated run script.
> Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
> 0  libprivatellvm.so.19 0x00001ca34ed8f2c9 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 57
> 1  libprivatellvm.so.19 0x00001ca34ed8d185 llvm::sys::RunSignalHandlers() + 85
> 2  libprivatellvm.so.19 0x00001ca34ed8f9d7 llvm::support::detail::provider_format_adapter<int>::format(llvm::raw_ostream&, llvm::StringRef) + 375
> 3  libthr.so.3          0x00001ca352fc88ec _pthread_sigmask + 1340
> 4  libthr.so.3          0x00001ca352fc7ebb pthread_signals_unblock_np + 1467
> 5  libthr.so.3          0x00001ca34449d2d3 pthread_signals_unblock_np + 18446744073462962643
> 6  libprivatellvm.so.19 0x00001ca34d5b28be llvm::cl::opt<int, false, llvm::cl::parser<int>>::~opt() + 62
> 7  libc.so.7            0x00001ca35434131f __cxa_finalize + 351
> [2]    5802 bus error (core dumped)  cc
> 
> i'm using pkgbase so unlikely to be a partial install.  could it be that
> this change requires a clean build?

I think it's likely that Kevin's https://reviews.freebsd.org/D50388 / https://cgit.freebsd.org/src/commit/?id=9b3055d0d4bc is the cause: it flips MK_LLVM_ASSERTIONS from "yes" to "no" by default. My guess is that some objects, libraries or binaries do not get rebuilt, leading to inconsistencies.

There probably has to be another depend-cleanup.sh hack to get over this. Another complication is that in depend-cleanup.sh you don't have access to the MK_xxx options from src.opts.mk.

-Dimitry