New warning in v6.11-rc1: BUG: using smp_processor_id() in preemptible [00000000] code: rtcwake/2121

[Kalle Valo]

Hi,

Just to make sure everyone is aware. I just updated the ath.git main
branch to v6.11-rc1 and I see a new warning in our suspend tests:

[  546.233940] BUG: using smp_processor_id() in preemptible [00000000] code: rtcwake/2121
[  546.233960] caller is debug_smp_processor_id+0x17/0x20
[  546.233970] CPU: 5 UID: 0 PID: 2121 Comm: rtcwake Not tainted 6.11.0-rc1 #1685
[  546.233975] Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0067.2021.0528.1339 05/28/2021
[  546.233978] Call Trace:
[  546.233981]  <TASK>
[  546.233985]  dump_stack_lvl+0xa4/0xe0
[  546.233991]  dump_stack+0x10/0x20
[  546.233995]  check_preemption_disabled+0xce/0xe0
[  546.234003]  debug_smp_processor_id+0x17/0x20
[  546.234008]  hotplug_cpu__broadcast_tick_pull+0x20/0x280
[  546.234017]  takedown_cpu+0x197/0x410

There's a fix already which hopefully will be in v6.11-rc2:

Subject: [PATCH] tick/broadcast: Move per CPU pointer access into the atomic section

https://lore.kernel.org/all/87ttg56ers.ffs@tglx/

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