Re: kern/49831: kernel panic on close of ucom tty

[Iain Hibbert <plunky%ogmig.net@localhost>]

On Tue, 28 Jun 2016, Nick Hudson wrote:

> Please try
> 
> http://www.netbsd.org/~skrll/nhusb.amd64.2.netbsd

Hmm.. boot single user with nouveau disabled .. then plug the device in, 
and immediate panic in ucom_attach()

umct0 at uhub1 port 1
umct0: Targus Group Intl Targus Group Intl, rev 1.10/1.03, addr 2
ucom0 at umct0
panic: kernel diagnostic assertion "ucaa->ucaa_bulkin != -1 || (ucaa->ucaa_ipipe && ucaa->ucaa_ixfer)" failed: file "/wrk/nhusb/src/sys/dev/usb/ucom.c", line 271 
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff80114c15 cs 8 rflags 246 cr2 706682946000 ilevel 0 rsp fffffe8040defa00
curlwp 0xfffffe81077e6160 pid 0.53 lowest kstack 0xfffffe8040dec2c0
Stopped in pid 0.53 (system) at	netbsd:breakpoint+0x5:	leave	
db{1}>
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x140
cd_play_msf() at netbsd:cd_play_msf
ucom_attach() at netbsd:ucom_attach+0x85a
config_attach_loc() at netbsd:config_attach_loc+0x17a
config_found_sm_loc() at netbsd:config_found_sm_loc+0x48
umct_attach() at netbsd:umct_attach+0x23a
config_attach_loc() at netbsd:config_attach_loc+0x17a
config_found_sm_loc() at netbsd:config_found_sm_loc+0x48
usbd_attachwholedevice() at netbsd:usbd_attachwholedevice+0x8e
usbd_probe_and_attach() at netbsd:usbd_probe_and_attach+0x46
usbd_new_device() at netbsd:usbd_new_device+0xf0d
uhub_explore() at netbsd:uhub_explore+0x2f4
usb_discover() at netbsd:usb_discover+0x6f
usb_event_thread() at netbsd:usb_event_thread+0x238
db{1}> 

I got a backtrace this time, though no core .. and also I tried with 
hw.ucom.debug=1 but no additional information was shown

iain