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

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

[bugzilla-daemon]

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

            Bug ID: 221346
           Summary: Bluetooth: btintel_pcie (8086:e476) may hang in
                    shutdown path (synchronize_irq) during reboot stress
                    test
           Product: Drivers
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: zhangzhigang1996@gmail.com
        Regression: No

On a system with Intel Bluetooth device [8086:e476] using the btintel_pcie
driver, the system intermittently hangs during reboot or shutdown, especially
under stress test conditions (continuous reboot cycles).

During shutdown, systemd-udevd is observed to be stuck in D state. Kernel
stack traces show the task blocked in the driver removal path, waiting in
synchronize_irq() after free_irq() is called.

The relevant call trace is:

  btintel_pcie_remove()
    → free_irq()
    → synchronize_irq()
      → __synchronize_irq()
      → wait for IRQ handler completion (never returns)

This indicates that the interrupt handler associated with the device may not
be properly quiesced before free_irq(), leading to a deadlock during teardown.

The issue is reproducible and disappears when the btintel_pcie module is
unloaded or blacklisted, suggesting the problem is specific to the btintel_pcie
driver.

No firmware loading errors are observed, and the device is otherwise functional
during normal operation.

This may indicate incomplete interrupt shutdown handling in the btintel_pcie
driver.

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

[bugzilla-daemon]

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

[bugzilla-daemon]

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

--- Comment #2 from Zhang Zhigang (zhangzhigang1996@gmail.com) ---
Created attachment 309857
  --> https://bugzilla.kernel.org/attachment.cgi?id=309857&action=edit
crash log images

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