Re: kern/38528 (panic on unplugging Apple USB keyboard)

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

The following reply was made to PR kern/38528; it has been noted by GNATS.

From: Christoph Egger <Christoph_Egger%gmx.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, 
 gnats-admin%netbsd.org@localhost, drochner%NetBSD.org@localhost
Subject: Re: kern/38528 (panic on unplugging Apple USB keyboard)
Date: Mon, 26 May 2008 00:34:14 +0200

 drochner%NetBSD.org@localhost wrote:
 > I've reorganized the code somewhat, could you try with -current?
 
 A -current kernel still panics. The backtrace is different now:
 
 uhub2: uhub0 port 6 (addr 3) disconnected
 uhidev0: at uhub2 port 3 (addr 4) disconnected
 wskbd1: detached
 ukbd0: detached
 uhidev0: detached
 uhidev1: at uhub2 port 3 (addr 4) disconnected
 uvm_fault(0xffffffff80cac800, 0x0, 1) -> e
 kernel: page fault trap, code=0
 Stopped in pid 0.40 (system) at netbsd:uhidev_childdet+0x32: cmpq 
 0(%rax),%r12
 db{1}> bt
 uhidev_childdet() at netbsd:uhidev_childdet+0x32
 config_detach() at netbsd:config_detach+0x1de
 uhidev_detach() at netbsd:uhidev_detach+0x80
 config_detach() at netbsd:config_detach+0x192
 usb_disconnect_port() at netbsd:usb_disconnect_port+0x69
 uhub_detach() at netbsd:uhub_detach+0x82
 config_detach() at netbsd:uhub_detach+0x192
 usb_disconnect_port() at netbsd:usb_disconnect_port+0x69
 uhub_explore() at netbsd:uhub_explore+0x11e
 usb_discover() at netbsd:usb_discover+0x37
 usb_event_thread() at netbsd:usb_event_thread+0x3e
 
 The %rax is 0  in the cmpq 0(%rax),%r12 instruction.
 So it's a NULL dereference bug.
 
 Christoph