* Re: thunderbolt: NULL deref in nhi_remove() from pciehp during shutdown (Titan Ridge, ThinkPad P1 Gen 3)
[not found] <CADsFipQPdiLag-w56GjdCFgvuUbKhdC4B-2hc9tPUjr31jPiLw@mail.gmail.com>
@ 2026-11-09 10:49 ` Mika Westerberg
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From: Mika Westerberg @ 2026-11-09 10:49 UTC (permalink / raw)
To: Alex; +Cc: westeri, linux-usb, Lukas Wunner
Hi,
On Fri, Nov 06, 2026 at 07:46:16PM -0800, Alex wrote:
> Hi Mika,
>
> I'm not a kernel developer, so apologies if this isn't the right way to report
> this.
>
> My ThinkPad P1 Gen 3 has been hanging instead of turning off
> for most of this year whenever it powers itself off on a low battery.
> I had an AI assistant (Claude Code) dig into it, and it found what
> looks like a double teardown of the Thunderbolt NHI during shutdown.
> The info dump below and a suggested patch are AI-generated, so please treat
> them that way.
>
> I applied the patch and it fixed the problem, and it looks like from research
> that this issue was called out as a bit of a concern when it was comitted back
> in the day, so thought I would share in case you want to fix it.
>
> Thanks,
> -Alex
>
> ------
>
> Hardware: ThinkPad P1 Gen 3 (20TH0037US), BIOS N2VET36W (1.21)
> 2021-12-27, Titan Ridge JHL7540 behind root port 00:1c.0 (pciehp,
> HotPlug+ Surprise+). Firmware connection manager. Ubuntu 24.04, kernel
> 6.8.0-138 at the time of this dump. The nvidia and ZFS modules are
> loaded, hence the taint.
Can you try with a newer kernel and see if the problem still happens?
Something like v7.3 would be good. If it does then please provide dump.
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