On 1/15/25 2:36 AM, Puranjay Mohan wrote:
BPF programs can execute in all kinds of contexts and when a program running in a non-preemptible context uses the bpf_send_signal() kfunc, it will cause issues because this kfunc can sleep. So change `irqs_disabled()` to `!preemptible()` that covers all edge cases: preempt_count() == 0 and irqs_disabled() Reported-by: [email protected] Closes: https://lore.kernel.org/all/[email protected]/ Fixes: 1bc7896e9ef4 ("bpf: Fix deadlock with rq_lock in bpf_send_signal()") Signed-off-by: Puranjay Mohan <[email protected]>
Acked-by: Yonghong Song <[email protected]>
