[Bug 221346] Bluetooth: btintel_pcie (8086:e476) may hang in shutdown path (synchronize_irq) during reboot stress test

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221346

--- Comment #4 from Zhang Zhigang (zhangzhigang1996@gmail.com) ---
Hi,

Thanks for your follow-up.

I’d like to clarify that I did not close the issue because the problem was
resolved. The issue still exists, but I temporarily marked it as invalid due to
lack of sufficient debugging data from my side.

Here is the current status:

1. The system still occasionally hangs during shutdown.
2. The hang happens at a relatively late stage of the shutdown process.
3. It is difficult to capture logs, since at that point most logging services
are already stopped. Currently, I can only observe the last messages on the
screen.

I also attempted to rule out Bluetooth-related causes by blacklisting the
relevant kernel modules:

* btintel_pcie
* btintel
* btusb
* bluetooth

However, even with Bluetooth disabled, the shutdown hang still occurs. This
suggests that the issue is likely unrelated to Bluetooth.

Given that my understanding of the kernel is still relatively limited, I would
greatly appreciate any suggestions on more effective debugging methods,
especially for capturing logs during late shutdown stages.

Thank you for your time and support.
Additional information:

* The issue is intermittent and not easily reproducible.
* I am willing to test patches or enable additional debug options if needed.
* Please let me know if enabling specific kernel parameters (e.g. debug,
earlyprintk, pstore, etc.) would help capture more useful logs.

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