https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291272
Bug ID: 291272
Summary: tcp_bbr.ko, tcp_rack.ko fail 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: [email protected]
Reporter: [email protected]
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 tcp_bbr.ko
TCP HPTS started 1 ((unbounded)) swi interrupt threads
link_elf_obj: symbol tcp_hptsi_pace undefined
linker_load_file: /boot/kernel/tcp_bbr.ko - unsupported file type
kldload: an error occurred while loading module tcp_bbr.ko. Please check
dmesg(8) for more details.
# kldload tcp_rack.ko
TCP HPTS started 1 ((unbounded)) swi interrupt threads
link_elf_obj: symbol tcp_hptsi_pace undefined
linker_load_file: /boot/kernel/tcp_rack.ko - unsupported file type
kldload: an error occurred while loading module tcp_rack.ko. Please check
dmesg(8) for more details.
The dependent module's Makefile (i.e., the one containing tcp_hptsi_pace)
should have an EXPORT_SYMS= line that lists all of the symbols to be
intentionally exported.
Another option is to just set EXPORT_SYMS=YES. An explicit export list is
preferred over EXPORT_SYMS=YES, unless we explicitly want all symbols exported.
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