Re: [PATCH bpf-next v3] bpf: prevent nesting overflow in bpf_try_get_buffers

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri, 14 Nov 2025 12:19:22 +0530 you wrote:
> bpf_try_get_buffers() returns one of multiple per-CPU buffers based on a
> per-CPU nesting counter. This mechanism expects that buffers are not
> endlessly acquired before being returned. migrate_disable() ensures that a
> task remains on the same CPU, but it does not prevent the task from being
> preempted by another task on that CPU.
> 
> Without disabled preemption, a task may be preempted while holding a
> buffer, allowing another task to run on same CPU and acquire an
> additional buffer. Several such preemptions can cause the per-CPU
> nest counter to exceed MAX_BPRINTF_NEST_LEVEL and trigger the warning in
> bpf_try_get_buffers(). Adding preempt_disable()/preempt_enable() around
> buffer acquisition and release prevents this task preemption and
> preserves the intended bounded nesting behavior.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] bpf: prevent nesting overflow in bpf_try_get_buffers
    https://git.kernel.org/bpf/bpf-next/c/c1da3df7191f

You are awesome, thank you!
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