Hello:
This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:
On Mon, 11 Sep 2023 15:28:14 +0200 you wrote:
> Sysbot discovered that the queue and stack maps can deadlock if they are
> being used from a BPF program that can be called from NMI context (such as
> one that is attached to a perf HW counter event). To fix this, add an
> in_nmi() check and use raw_spin_trylock() in NMI context, erroring out if
> grabbing the lock fails.
>
> Fixes: f1a2e44a3aec ("bpf: add queue and stack maps")
> Reported-by: Hsin-Wei Hung <hsinweih@xxxxxxx>
> Tested-by: Hsin-Wei Hung <hsinweih@xxxxxxx>
> Co-developed-by: Hsin-Wei Hung <hsinweih@xxxxxxx>
> Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
>
> [...]
Here is the summary with links:
- [bpf] bpf: Avoid deadlock when using queue and stack maps from NMI
https://git.kernel.org/bpf/bpf/c/a34a9f1a19af
You are awesome, thank you!
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