linux-kernel - Re: [PATCH v6 02/10] irqchip/irq-msi-lib: Optionally set default irq_eoi/irq

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Message-ID: <878qq0itnl.ffs@tglx>
Date: Thu, 20 Feb 2025 15:21:18 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Mark Brown <broonie@...nel.org>, Anup Patel <apatel@...tanamicro.com>
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
 Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, hpa@...or.com, Marc
 Zyngier <maz@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
 <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
 Andrew Lunn <andrew@...n.ch>, Gregory Clement
 <gregory.clement@...tlin.com>, Sebastian Hesselbarth
 <sebastian.hesselbarth@...il.com>, Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Atish Patra
 <atishp@...shpatra.org>, Andrew Jones <ajones@...tanamicro.com>, Sunil V L
 <sunilvl@...tanamicro.com>, Anup Patel <anup@...infault.org>,
 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH v6 02/10] irqchip/irq-msi-lib: Optionally set default
 irq_eoi/irq_ack

On Thu, Feb 20 2025 at 14:54, Thomas Gleixner wrote:
> On Wed, Feb 19 2025 at 14:41, Mark Brown wrote:
>> On Mon, Feb 17, 2025 at 02:26:48PM +0530, Anup Patel wrote:
>> I'm seeing boot regressions with qemu on arm64 in -next which bisect
>> down to this patch.  We hit a NULL pointer dereference:
>>
>> <6>[    0.898900] virtio_blk virtio1: 1/0/0 default/read/poll queues
>> <5>[    0.910197] virtio_blk virtio1: [vda] 3906250 512-byte logical blocks (2.00 GB/1.86 GiB)
>> <1>[    0.924459] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
>> <1>[    0.924508] Mem abort info:
>> <1>[    0.924521]   ESR = 0x000000008600002b
>> <1>[    0.924559]   EC = 0x21: IABT (current EL), IL = 32 bits
>> <1>[    0.924580]   SET = 0, FnV = 0
>> <1>[    0.924597]   EA = 0, S1PTW = 0
>> <1>[    0.924616]   FSC = 0x2b: level -1 translation fault
>> <1>[    0.924667] [0000000000000000] user address but active_mm is swapper
>> <0>[    0.924833] Internal error: Oops: 000000008600002b [#1] PREEMPT
>> SMP
>
> Uuurg. I wish I had double checked that the final submitted patch covers
> _ALL_ incarnations of this. The below delta patch should address it.

I'll redo the branch accordingly.

Thanks,

         tglx