[Bug 221346] New: 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

            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.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are the assignee for the bug.