[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

Zhang Zhigang (zhangzhigang1996@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|                            |6.18.1

--- Comment #1 from Zhang Zhigang (zhangzhigang1996@gmail.com) ---
### Additional system information

#### Hardware

```
00:14.3 Network controller [0280]: Intel Corporation Device [8086:e440] (rev
01)
00:14.7 Bluetooth [0d11]: Intel Corporation Device [8086:e476] (rev 01)
```

#### PCI device details

```
00:14.7 Bluetooth [0d11]: Intel Corporation Device [8086:e476] (rev 01)
        Subsystem: Intel Corporation Device [8086:0011]
        Kernel driver in use: btintel_pcie
        Kernel modules: btintel_pcie
```

#### Loaded Bluetooth-related modules

```
btintel_pcie           45056  0
btintel                69632  1 btintel_pcie
bluetooth             958464  43 btintel_pcie,btintel,bnep,rfcomm
```

#### Driver information

```
filename:      
/lib/modules/6.18.1-01-perlis001-20260409003/kernel/drivers/bluetooth/btintel_pcie.ko
version:        0.1
description:    Intel Bluetooth PCIe transport driver ver 0.1
```

#### Kernel version

```
6.18.1-01-perlis001-20260409003
```

#### Firmware

Available firmware files under /lib/firmware/intel/ (ibt-*.sfi / .ddc present)

Note:
No firmware loading messages observed in dmesg.

#### dmesg (Bluetooth-related)

```
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
```

#### udev device path

```
/devices/pci0000:00/0000:00:14.7/bluetooth/hci0
```

#### Interrupts

```
IR-PCI-MSIX-0000:00:14.7    btintel_pcie
```

#### Additional observations

* systemd-udevd enters D state during shutdown
* Issue disappears when btintel_pcie is unloaded or blacklisted
* Problem reproducible under reboot stress test

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