jasonmolenda wrote:
> I have fixed/worked around the mach exception issue in a [followup
> commit](https://github.com/llvm/llvm-project/commit/b903badd73a2467fdd4e363231f2bf9b0704b546)
> with a `settings set platform.plugin.darwin.ignored-exceptions
> EXC_BAD_INSTRUCTION`. Now the process gets a SIGILL as expected, but it still
> fails at the backtrace step (the second one, after stopping inside the
> handler).
Oh, that's a clever idea, I forgot about that setting.
If you add `process handle -p true -s false SIGILL` (lldb was stopping on the
SIGILL signal before sigtramp / the registered handler ran), then
sigill_handler is called,
```
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
* frame #0: 0x0000000100003f4c a.out`sigill_handler(signo=4) + 20 at
signal-in-leaf-function-aarch64.c:10
frame #1: 0x0000000197f93584 libsystem_platform.dylib`_sigtramp + 56
frame #2: 0x0000000100003f7c a.out`main + 44 at
signal-in-leaf-function-aarch64.c:14
frame #3: 0x0000000197bda0e0 dyld`start + 2360
```
https://github.com/llvm/llvm-project/pull/91321
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