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Message-ID: <1c3cb265-2497-537d-3c7b-ca4766775b46@linaro.org>
Date:   Wed, 20 Apr 2022 11:42:36 +0200
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Subject: Re: [PATCH v3 2/3] genirq: Always limit the affinity to online CPUs
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To:     Marc Zyngier <maz@kernel.org>
Cc:     Marek Szyprowski <m.szyprowski@samsung.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        'Linux Samsung SOC' <linux-samsung-soc@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        John Garry <john.garry@huawei.com>,
        Xiongfeng Wang <wangxiongfeng2@huawei.com>,
        David Decotigny <ddecotig@google.com>
References: <20220405185040.206297-1-maz@kernel.org>
 <20220405185040.206297-3-maz@kernel.org>
 <CGME20220413145922eucas1p2dc46908354f4d2b48db79978d086a838@eucas1p2.samsung.com>
 <4b7fc13c-887b-a664-26e8-45aed13f048a@samsung.com>
 <878rs8c2t2.wl-maz@kernel.org>
 <5dcf8d22-e9b3-f306-4c5f-256707e08fbf@samsung.com>
 <877d7sar5k.wl-maz@kernel.org>
 <39f69dfe-32e5-4cb3-118b-5c02b28cbcff@samsung.com>
 <70123e98-046f-f10e-1032-8d112edd3ecf@linaro.org>
 <87mtgg9jok.wl-maz@kernel.org>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <87mtgg9jok.wl-maz@kernel.org>
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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@hot-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