linux-kernel - Re: [PATCH v3 2/3] genirq: Always limit the affinity to online CPUs

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Date:   Wed, 20 Apr 2022 11:42:36 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        'Linux Samsung SOC' <linux-samsung-soc@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Garry <john.garry@...wei.com>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        David Decotigny <ddecotig@...gle.com>
Subject: Re: [PATCH v3 2/3] genirq: Always limit the affinity to online CPUs

On 20/04/2022 11:40, Marc Zyngier wrote:
> It was picked up by Thomas and pushed out into tip, which is pulled by
> -next:
> 
> maz@...-poop:~/arm-platforms$ git describe --contains c48c8b829d2b966a6649827426bcdba082ccf922
> next-20220420~51^2~3^2
> 
> So it definitely is in today's -next.
> 
>> Instead of silent fail there is now "Unable to handle kernel paging
>> request at virtual address f0836644", so it is slightly different.
>>
>> See the dmesg:
>> https://krzk.eu/#/builders/21/builds/3542/steps/15/logs/serial0
> 
> This looks completely unrelated:
> 
> [   10.382010] Unable to handle kernel paging request at virtual address f0836644
> [   10.388597] [f0836644] *pgd=41c83811, *pte=00000000, *ppte=00000000
> [   10.394482] Internal error: Oops: 807 [#1] PREEMPT SMP ARM
> [   10.399567] Modules linked in:
> [   10.402583] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.18.0-rc3-next-20220420 #2
> [   10.410060] Hardware name: Samsung Exynos (Flattened Device Tree)
> [   10.416106] PC is at cpu_ca15_set_pte_ext+0x4c/0x58
> [   10.420952] LR is at handle_pte_fault+0x218/0x260
> [   10.425631] pc : [<c011d588>]    lr : [<c02ab188>]    psr: 40000113
> [   10.431874] sp : f0835df0  ip : f0835e5c  fp : 00000081
> [   10.437069] r10: c0f2eafc  r9 : c1d31000  r8 : 00000000
> [   10.442268] r7 : c1d58000  r6 : 00000081  r5 : befffff6  r4 : f0835e24
> [   10.448773] r3 : 00000000  r2 : 00000000  r1 : 00000040  r0 : f0835e44
> [   10.455273] Flags: nZcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> [   10.462381] Control: 10c5387d  Table: 4000406a  DAC: 00000051
> 
> This is a crash in cpu_ca15_set_pte_ext() when populating the
> userspace page tables, which seems unrelated to interrupt affinity.
> 
> I suggest you bisect this to find the actual problem.

Thanks for checking.


Best regards,
Krzysztof