linux-kernel - Re: [Regression] 6.11.0-rc1: BUG: using smp_processor_id() in preemptible when suspend the system

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Message-ID: <460216e0.a699.19108f05b46.Coremail.00107082@163.com>
Date: Wed, 31 Jul 2024 21:17:35 +0800 (CST)
From: "David Wang" <00107082@....com>
To: "Thomas Gleixner" <tglx@...utronix.de>
Cc: liaoyu15@...wei.com, linux-kernel@...r.kernel.org, 
	linux-tip-commits@...r.kernel.org, stable@...r.kernel.org, 
	x86@...nel.org
Subject: Re: [Regression] 6.11.0-rc1: BUG: using smp_processor_id() in
 preemptible when suspend the system

Hi, 

At 2024-07-30 23:07:41, "Thomas Gleixner" <tglx@...utronix.de> wrote:
>On Tue, Jul 30 2024 at 22:25, David Wang wrote:
>> When I suspend my system, via `systemctl suspend`, kernel BUG shows up in log:
>>
>>  kernel: [ 1734.412974] smpboot: CPU 2 is now offline
>>  kernel: [ 1734.414952] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-sleep/4619
>>  kernel: [ 1734.414957] caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0
>
>The below should fix that.
>
>Thanks,

I thought the offending line was smp_processor_id() used for cpumask_clear_cpu, so confused by this patch.... never mind

Sorry for the delay, I applied the patch and it dose fix the issue.

FYI
David 

>
>        tglx
>---
>--- a/kernel/time/tick-broadcast.c
>+++ b/kernel/time/tick-broadcast.c
>@@ -1141,7 +1141,6 @@ void tick_broadcast_switch_to_oneshot(vo
> #ifdef CONFIG_HOTPLUG_CPU
> void hotplug_cpu__broadcast_tick_pull(int deadcpu)
> {
>-	struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
> 	struct clock_event_device *bc;
> 	unsigned long flags;
> 
>@@ -1167,6 +1166,8 @@ void hotplug_cpu__broadcast_tick_pull(in
> 		 * device to avoid the starvation.
> 		 */
> 		if (tick_check_broadcast_expired()) {
>+			struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
>+
> 			cpumask_clear_cpu(smp_processor_id(), tick_broadcast_force_mask);
> 			tick_program_event(td->evtdev->next_event, 1);
> 		}