From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Maninder Singh <maninder1.s@samsung.com>
Cc: linus.walleij@linaro.org, ardb@kernel.org,
ndesaulniers@google.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] arm: traps: remove fp underflow checking
Date: Fri, 24 Apr 2026 13:21:38 +0100 [thread overview]
Message-ID: <aetgUvRidhdUeY2G@shell.armlinux.org.uk> (raw)
In-Reply-To: <20260424043029.4101133-1-maninder1.s@samsung.com>
On Fri, Apr 24, 2026 at 10:00:29AM +0530, Maninder Singh wrote:
> with IRQSTACKS fp can point outside of thread's stack.
> And when there is crash reported from IRQ side, it always report
> "frame pointer underflow", which is not real underflow.
>
> Unhandled fault: page domain fault (0x81b) at 0x00000000
> ..
> PC is at handle_irq_desc+0x68/0xa4
> LR is at generic_handle_domain_irq+0x18/0x1c
> ..
>
> Call trace: frame pointer underflow
> handle_irq_desc from generic_handle_domain_irq+0x18/0x1c
> generic_handle_domain_irq from gic_handle_irq+0x78/0x8c
> gic_handle_irq from generic_handle_arch_irq+0x3c/0x4c
> ..
>
> It is just warning print and there is no decision based on this
> to stop backtrack or etc. So it can be removed.
Please find a way to check whether the frame pointer is within the
IRQ stack rather than removing this.
Thanks.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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prev parent reply other threads:[~2026-04-24 12:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20260424043122epcas5p17e2f88653e398c5a53c0ffa4c1e01bc1@epcas5p1.samsung.com>
2026-04-24 4:30 ` [PATCH 1/1] arm: traps: remove fp underflow checking Maninder Singh
2026-04-24 12:21 ` Russell King (Oracle) [this message]
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