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Date:      Fri, 28 Nov 2025 18:02:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 291270] mfi_linux.ko fails to load with module loader local symbol resolution disabled
Message-ID:  <bug-291270-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291270

            Bug ID: 291270
           Summary: mfi_linux.ko fails to load with module loader local
                    symbol resolution disabled
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org
            Blocks: 207898

See
https://lists.freebsd.org/archives/freebsd-current/2025-November/009500.html
for background.

To reproduce, set
debug.link_elf_leak_locals=0
debug.link_elf_obj_leak_locals=0
then

# kldload mfi_linux.ko
link_elf_obj: symbol linux_device_register_handler undefined
linker_load_file: /boot/kernel/mfi_linux.ko - unsupported file type
kldload: an error occurred while loading module mfi_linux.ko. Please check
dmesg(8) for more details.

The dependent module's Makefile should have an EXPORT_SYMS= line that lists all
of the symbols that should be intentionally exported. Another option (but not
preferred) is to just set EXPORT_SYMS=YES, unless we explicitly want all
symbols exported.


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207898
[Bug 207898] kernel linker behaves differently on amd64 vs. i386
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