Re: [PATCH bpf v2] bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()

[patchwork-bot+netdevbpf]

Hello:

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

On Tue, 29 Sep 2026 11:10:34 +0300 you wrote:
> bpf_mem_cache_free_rcu() uses this_cpu_ptr() which requires migration
> to be disabled. All callers of rhtab_delete_elem() disable migration
> except __rhtab_map_lookup_and_delete_batch(), which calls it under
> rcu_read_lock() only.
> 
> On CONFIG_PREEMPT_RCU, rcu_read_lock() does not disable preemption or
> migration, so the task can migrate between CPUs during the delete loop,
> causing this_cpu_ptr() to trigger:
> 
> [...]

Here is the summary with links:
  - [bpf,v2] bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()
    https://git.kernel.org/bpf/bpf/c/de020dc8049b

You are awesome, thank you!
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