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authorOleg Nesterov2023-11-14 17:32:34 +0100
committerAlexei Starovoitov2023-11-19 11:43:44 -0800
commit2d1618054f25e11c44d189dbff4a60342a4cfb4b (patch)
treef801475761d64aa6bdaed25a183a7cc23efbce55 /Documentation
parent16b3129e14bf2e7505512568b11c437c840a0c19 (diff)
bpf: task_group_seq_get_next: use __next_thread() rather than next_thread()
Lockless use of next_thread() should be avoided, kernel/bpf/task_iter.c is the last user and the usage is wrong. task_group_seq_get_next() can return the group leader twice if it races with mt-thread exec which changes the group->leader's pid. Change the main loop to use __next_thread(), kill "next_tid == common->pid" check. __next_thread() can't loop forever, we can also change this code to retry if next_tid == 0. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20231114163234.GA890@redhat.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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