panic: mutex Giant not owned at /usr/src/sys/kern/tty_ttydisc.c:1127

Hans Petter Selasky hselasky at
Fri Jan 23 08:12:19 PST 2009

On Friday 23 January 2009, Lars Engels wrote:
> 0xf12eabd8) at /usr/src/sys/i386/i386/trap.c:318
> #17 0xc0b3fb3b in

Hi Lars,

Maksim has made a lot of changes to the Bluetooth driver. Maybe he can look 
into it?

This looks like a NULL-pointer access to me.


In the ubt_detach routine, make sure that:

0) No further commands are accepted from the Netgraph stack.
1) You drain the task queue!
2) You drain all USB transfers: "usb2_transfer_drain()" called unlocked.
3) Set the "sc_node" to NULL.


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