linux-kernel - Re: Stack trace when removing Thunderbolt devices while kernel shutting down

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Message-ID: <20200218142243.GA190321@google.com>
Date:   Tue, 18 Feb 2020 08:22:43 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: Stack trace when removing Thunderbolt devices while kernel
 shutting down

On Tue, Feb 18, 2020 at 02:18:40PM +0000, Nicholas Johnson wrote:
> Hi Bjorn,
> 
> 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.
> 
> In your mind, is this cause for concern? There is no harm caused and the 
> kernel still shuts down. The main thing I am worried about is if this 
> means that the locking around the subsystem is not strict enough.
> 
> If you think this is worth looking into, I will try to learn about how 
> the native interrupts are handled and try to investigate, and I will 
> also try to get my serial console working again to capture the details.

Yes, I think this is worth looking into.