From: Lukas Wunner <lukas@wunner.de>
To: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: Re: Stack trace when removing Thunderbolt devices while kernel shutting down
Date: Tue, 18 Feb 2020 16:01:24 +0100 [thread overview]
Message-ID: <20200218150124.stvsj2rozxrgxw2h@wunner.de> (raw)
In-Reply-To: <PSXP216MB0438220243C0097569D4B2DB80110@PSXP216MB0438.KORP216.PROD.OUTLOOK.COM>
On Tue, Feb 18, 2020 at 02:18:40PM +0000, Nicholas Johnson wrote:
> If I surprise remove Thunderbolt 3 devices just as the kernel is
> shutting down, I get stack dumps, when those devices would not normally
> cause stack dumps if the kernel were not shutting down.
>
> Because the kernel is shutting down, it makes it difficult to capture
> the logs without a serial console.
Hold a camera in front of the screen and try to capture the messages
as an MP4 movie which can be uploaded to YouTube or something.
If the output moves too fast to capture it, artificially slow it down
by adding a udelay() to call_console_drivers() in kernel/printk/printk.c.
Thanks,
Lukas
next prev parent reply other threads:[~2020-02-18 15:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 14:18 Stack trace when removing Thunderbolt devices while kernel shutting down Nicholas Johnson
2020-02-18 14:22 ` Bjorn Helgaas
2020-02-18 15:01 ` Lukas Wunner [this message]
2020-02-18 16:57 ` Nicholas Johnson
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