[Bug 292132] Page fault in usb_callback_proc() after hot-unplugging uchcom(4) device

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 02 Jan 2026 16:37:37 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292132

            Bug ID: 292132
           Summary: Page fault in usb_callback_proc() after hot-unplugging
                    uchcom(4) device
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb@FreeBSD.org
          Reporter: christos@freebsd.org

Created attachment 266755
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=266755&action=edit
panic screenshot

Unfortunately I only have the panic in a screenshot right now (see attachment).

To reproduce I did the following:

1. Plug Arduino Uno board (uchcom(4)). Its device is /dev/cuaU0.
2. Open serial console with `cu -l /dev/cuaU0`.
3. Unplug.

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