[Bug 250309] devmatch: panic: general protection fault: sysctl_devices() -> sysctl_root_handler_locked() in hw.bus.devices sysctl handler when plugging in USB mouse

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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 24 Feb 2025 05:38:44 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250309

--- Comment #10 from Warner Losh <imp@FreeBSD.org> ---
I've tested similar patches, but they have lead to deadlock or inconsistent
device data. This protects the children and global lists but not other data.
It's held in child deleted callback, which is what lead to the deadlock, though
i forget the bus driver at fault.

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