On Sat, Dec 17, 2022 at 02:32:03PM +0100, [email protected] wrote:
> While doing the following actions:
>
> 1. Plugging this USB device:
>
> ugen0 at uhub0 port 7 "INNO TECH USB to Serial" rev 1.10/0.02 addr 2
>
> 2. Running (remotely via ssh)
>
> tail -f /dev/ugen0.01
>
> 3. Physically unplugging the USB device
>
> [kernel notices ugen0 detached]
>
> 4. ^C in the terminal attached to the `tail -f /dev/ugen0.01` of step 2
>
> Panic occurs.
>
> [...]
>
> kernel: page fault trap, code x0
>
> Stopped at klist_remove_locked.0x53
This indicates that there was a stray knote that referred to the
detached device.
The following patch might help. Could you test it?
Index: dev/usb/ugen.c
===================================================================
RCS file: src/sys/dev/usb/ugen.c,v
retrieving revision 1.116
diff -u -p -r1.116 ugen.c
--- dev/usb/ugen.c 2 Jul 2022 08:50:42 -0000 1.116
+++ dev/usb/ugen.c 18 Dec 2022 11:42:26 -0000
@@ -474,6 +474,8 @@ ugen_do_close(struct ugen_softc *sc, int
free(sce->ibuf, M_USBDEV, sce->ibuflen);
sce->ibuf = NULL;
}
+
+ klist_invalidate(&sce->rsel.si_note);
}
sc->sc_is_open[endpt] = 0;
