Debugging x86 binaries on x86_64?

Subprojects LLDB
#1

Hi everyone,

I just built lldb 3.5.0 from source on a x86_64 Debian Stable machine (because there are no packages for Debian Stable). When I try to debug a 32bit (x86) application with the resulting binary, I get the following error:

$ lldb -p $(pgrep foo)
lldb: llvm-3.5.0.src/tools/lldb/source/Plugins/Process/Utility/RegisterContextLinux_x86_64.cpp:137: uint32_t GetRegisterInfoCount(const lldb_private::ArchSpec&): Assertion `!GetPrivateRegisterInfoVector ().empty () && "i386 register info not yet filled."' failed.
Aborted

Debugging x86_64 works just fine. Why is that? Is this a known bug? How can I fix this?

Best regards,

Arne

#2

It looks like debugging 32 bit processes hasn’t been implemented yet. You’ll find many things missing in the current Linux support. It’s being worked on but it will be a while. Let me know if you’re looking to help out! :slight_smile:

#3

This has been fixed back in August. You’re running an old version of lldb. I would recommend building from master if that’s possible for your use case.