Re: [PATCH v1 bpf-next] bpf: Disable migration when freeing stashed local kptr using obj drop

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Hello:

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

On Mon, 13 Mar 2023 14:46:41 -0700 you wrote:
> When a local kptr is stashed in a map and freed when the map goes away,
> currently an error like the below appears:
> 
> [   39.195695] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u32:15/2875
> [   39.196549] caller is bpf_mem_free+0x56/0xc0
> [   39.196958] CPU: 15 PID: 2875 Comm: kworker/u32:15 Tainted: G           O       6.2.0-13016-g22df776a9a86 #4477
> [   39.197897] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> [   39.198949] Workqueue: events_unbound bpf_map_free_deferred
> [   39.199470] Call Trace:
> [   39.199703]  <TASK>
> [   39.199911]  dump_stack_lvl+0x60/0x70
> [   39.200267]  check_preemption_disabled+0xbf/0xe0
> [   39.200704]  bpf_mem_free+0x56/0xc0
> [   39.201032]  ? bpf_obj_new_impl+0xa0/0xa0
> [   39.201430]  bpf_obj_free_fields+0x1cd/0x200
> [   39.201838]  array_map_free+0xad/0x220
> [   39.202193]  ? finish_task_switch+0xe5/0x3c0
> [   39.202614]  bpf_map_free_deferred+0xea/0x210
> [   39.203006]  ? lockdep_hardirqs_on_prepare+0xe/0x220
> [   39.203460]  process_one_work+0x64f/0xbe0
> [   39.203822]  ? pwq_dec_nr_in_flight+0x110/0x110
> [   39.204264]  ? do_raw_spin_lock+0x107/0x1c0
> [   39.204662]  ? lockdep_hardirqs_on_prepare+0xe/0x220
> [   39.205107]  worker_thread+0x74/0x7a0
> [   39.205451]  ? process_one_work+0xbe0/0xbe0
> [   39.205818]  kthread+0x171/0x1a0
> [   39.206111]  ? kthread_complete_and_exit+0x20/0x20
> [   39.206552]  ret_from_fork+0x1f/0x30
> [   39.206886]  </TASK>
> 
> [...]

Here is the summary with links:
  - [v1,bpf-next] bpf: Disable migration when freeing stashed local kptr using obj drop
    https://git.kernel.org/bpf/bpf-next/c/9e36a204bd43

You are awesome, thank you!
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