linux-kernel - CLANG LTO compatibility issue with DEBUG_INFO

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Message-ID: <20210319113730.7ad6a609@xhacker.debian>
Date:   Fri, 19 Mar 2021 11:45:44 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        linux-kernel@...r.kernel.org
Cc:     bpf@...r.kernel.org
Subject: CLANG LTO compatibility issue with DEBUG_INFO_BTF

Hi,

When trying the latest 5.12-rc3 with both LTO_CLANG_THIN and DEBUG_INFO_BTF
enabled, I met lots of warnings such as:

...
tag__recode_dwarf_type: couldn't find 0x4a7ade5 type for 0x4ab9f88 (subroutine_type)!
ftype__recode_dwarf_types: couldn't find 0x4a7ade5 type for 0x4ab9fa4 (formal_parameter)!
...
namespace__recode_dwarf_types: couldn't find 0x4a8ff4a type for 0x4aba05c (member)!
namespace__recode_dwarf_types: couldn't find 0x4a7ae9b type for 0x4aba084 (member)!
...
WARN: multiple IDs found for 'path': 281, 729994 - using 281
WARN: multiple IDs found for 'task_struct': 421, 730101 - using 421
...

then finally get build error:
FAILED unresolved symbol vfs_truncate

Is this a known issue? Do we need to make DEBUG_INFO_BTF depend on !LTO?

pahole version: v1.20
clang version: 11.0

Thanks