From: Breno Leitao <leitao@debian.org>
To: Sudeep Holla <sudeep.holla@kernel.org>
Cc: Jassi Brar <jassisinghbrar@gmail.com>,
Adam Young <admiyo@os.amperecomputing.com>,
linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
rmikey@meta.com, kernel-team@meta.com
Subject: Re: [PATCH] mailbox: pcc: Free the channel before unmapping the shared memory
Date: Thu, 13 Aug 2026 01:18:58 -0700 [thread overview]
Message-ID: <an19sQf5myJJnRq3@gmail.com> (raw)
In-Reply-To: <20260813-furry-seriema-of-prestige-af2a76@sudeepholla>
Hello Sudeep,
On Thu, Aug 13, 2026 at 03:57:29AM +0100, Sudeep Holla wrote:
> On Wed, Aug 12, 2026 at 05:36:03AM -0700, Breno Leitao wrote:
> > I am seeing a crash on PCC that is related to a an shared memory being
> > unmapped before the IRQ is disabled, and the IRQ kicks in and hits the
> > unmapped (NULL) address. This is a summary of what I see on my box:
> >
> > scmi_protocol scmi_dev.1: Message for 1 type 0 is not expected!
> > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004
> > __handle_irq_event_percpu+0x1c4/0x9e0
> > handle_irq_event+0x98/0x218
> > handle_fasteoi_irq+0x230/0x750
> > generic_handle_domain_irq+0xac/0x138
> > gic_handle_irq+0x344/0x740
> > call_on_irq_stack+0x30/0x48
> >
>
> Just curious as how are you testing ACPI PCC + SCMI using upstream and
> on which platform ?
I am using Arm AGI CPU with the latest SCMI patches that are being under
discussion in the mailing list.
--breno
next prev parent reply other threads:[~2026-08-13 8:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-12 12:36 [PATCH] mailbox: pcc: Free the channel before unmapping the shared memory Breno Leitao
2026-08-13 2:57 ` Sudeep Holla
2026-08-13 8:18 ` Breno Leitao [this message]
2026-08-13 10:45 ` Sudeep Holla
2026-08-13 10:54 ` Sudeep Holla
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