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bpf: Mark tracing_multi trampolines as ftrace managed

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Since tracing_multi link does not set ftrace_managed, it would fail to
release the tracing_multi link when attaching tracing_multi link and
then attaching fentry link.

[    3.714215] WARNING: kernel/bpf/trampoline.c:1727 at bpf_trampoline_multi_detach+0x20b/0x240, CPU#1: test_progs/97
...
[    3.733170]  bpf_tracing_multi_link_release+0x14/0x30
[    3.733890]  bpf_link_free+0x58/0x130
[    3.734414]  bpf_link_release+0x23/0x30

Fix it by setting 'ftrace_managed = true' in register_fentry_multi().

Fixes: aef4dfa790 ("bpf: Add bpf_trampoline_multi_attach/detach functions")
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20260711124822.29406-2-leon.hwang@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Leon Hwang 2026-07-11 20:48:21 +08:00 committed by Kumar Kartikeya Dwivedi
parent 25935519f7
commit 30bdd6d138
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1 changed files with 1 additions and 0 deletions
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kernel/bpf/trampoline.c
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@ -1536,6 +1536,7 @@ static int register_fentry_multi(struct bpf_trampoline *tr, struct bpf_tramp_ima
if (bpf_trampoline_use_jmp(tr->flags))
addr = ftrace_jmp_set(addr);
tr->func.ftrace_managed = true;
ftrace_hash_add(data->reg, data->entry, ip, addr);
tr->cur_image = im;
return 0;