When we run fexit bpf programs (e.g. attaching tcp_recvmsg) on our servers which were running old kernels, some of these servers crashed. Finally we figured out that it was caused by the same issue resolved by commit e21aa341785c ("bpf: Fix fexit trampoline."). After we backported that commit, the crash disappears. However new issues are introduced by that commit. This patchset fixes them. PATCH #1: Fix a memory leak found on our server PATCH #2: Remove bpf trampoline selector and also fix the issue in perf caused by the name change in bpf trampoline PATCH #3: Show target_{obj,btf}_id when link to a bpf trampoline v1->v2: - Reuse the common code between __bpf_tramp_image_put_deferred and bpf_tramp_image_free (Song) - Add fixes tag in patch #1 (Song) - Restore the old bpf trampoline name format (Song) - Jiri pointed out a issue in perf - Show btf information in the tracing link info Yafang Shao (3): bpf: Fix memleak due to fentry attach failure bpf: Remove bpf trampoline selector bpf: Show target_{obj,btf}_id in tracing link info include/linux/bpf.h | 1 - kernel/bpf/syscall.c | 12 ++++++++++-- kernel/bpf/trampoline.c | 32 +++++++++++++++++++------------- tools/bpf/bpftool/link.c | 4 ++++ 4 files changed, 33 insertions(+), 16 deletions(-) -- 1.8.3.1