alpha/127248: System crashes when many (7) serial port terminals (vt320-vt510) connected to the server via com to usb adapter and 2-usb hubs.

[Alexey Lebedev]

The following reply was made to PR alpha/127248; it has been noted by GNATS.

From: Alexey Lebedev <alexey at zhtw.org.ru>
To: bug-followup at FreeBSD.org, alexey at zhtw.org.ru
Cc:  
Subject: Re: alpha/127248: System crashes when many (7) serial port
	terminals (vt320-vt510) connected to the server via com to usb adapter and
	2-usb hubs.
Date: Fri, 19 Sep 2008 16:06:37 +0400

 I've added KDB, GDB, DDB. That's the backtrace:
 
 Tracing pid 28 tid 100026 td 0xfffffc001f510ac0
 free_untl() at free_untl+0x114
 free_unr() at free_unr+0xc4
 devfs_free() at devfs_free+0x4c
 destroy_devl() at destroy_devl+0x280
 destroy_devl() at destroy_devl+0x78
 destory_dev() at destroy_dev+0x24
 ttyfree() at rryfree+0x30
 ucom_detach() at ucom_detach+0x68
 uplcom_detach() at uplcom_detach+0x48
 device_detach() at device_detach+0x84
 usb_disconnect_port() at usb_disconnect_port+0xf0
 uhub_explore() at uhub_explore+0x214
 uhub_explore() at uhub_explore+0x1cc
 uhub_explore() at uhub_explore+0x1cc
 uhub_explore() at uhub_explore+0x1cc
 usb_discover() at usb_discover+0x48
 usb_event_thread() at usb_event_thread+0xb8
 fork_exit() at fork_exit+0xb0
 exception_return() at exception_return
 --- root of call fraph ---
 
 I didn't find out how to copy this to email and just retyped it here by
 hands, so there maybe some mistakes, even though i was very careful.
 How to do that btw?