Bug 291270 - mfi_linux.ko fails to load with module loader local symbol resolution disabled
Summary: mfi_linux.ko fails to load with module loader local symbol resolution disabled
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 16.0-CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords:
Depends on:
Blocks: 207898
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Reported: 2025-11-28 18:02 UTC by Ed Maste
Modified: 2025-11-28 18:04 UTC (History)
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Description Ed Maste freebsd_committer freebsd_triage 2025-11-28 18:02:47 UTC 
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.
Comment 1 Ed Maste freebsd_committer freebsd_triage 2025-11-28 18:04:12 UTC 
Also mrsas_linux.ko

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