usb/76204: panic while using usb attached modem

[Marcin Wisnicki]

The following reply was made to PR usb/76204; it has been noted by GNATS.

From: Marcin Wisnicki <mwisnicki at gmail.com>
To: freebsd-gnats-submit at FreeBSD.org
Cc:  
Subject: Re: usb/76204: panic while using usb attached modem
Date: Wed, 09 Feb 2005 01:49:55 +0100

 I have this problem (same backtrace) too on via vt8235 with
 ATEN/IOGEAR UC232A usb2serial adapter and isdn modem attached to it,
 using /usr/sbin/ppp, always connected. It seems to happen only under
 high load.
 
 usbdevs -v
 Controller /dev/usb0:
 addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), VIA(0x0000), rev 1.00
  port 1 addr 2: full speed, self powered, config 1, DeskJet 920C(0x1504), Hewlett-Packard(0x03f0), rev 1.00
  port 2 addr 3: full speed, power 100 mA, config 1, PL2303 Serial adapter (ATEN/IOGEAR UC232A)(0x2303), Prolific Technology(0x067b), rev 2.02
 
 uplcom.c with latest change (1.20.2.4)
 
 5.3-STABLE i386 Wed Jan 26 21:49:03 CET 2005
 
 (kgdb) bt
 #0  doadump () at pcpu.h:159
 #1  0xc04b1693 in boot (howto=0x104) at /usr/src/sys/kern/kern_shutdown.c:410
 #2  0xc04b19eb in panic (fmt=0xc0784024 "uhci_abort_xfer: not in process context")
     at /usr/src/sys/kern/kern_shutdown.c:566
 #3  0xc0770eda in uhci_abort_xfer (xfer=0xc4a52000, status=USBD_NORMAL_COMPLETION)
     at /usr/src/sys/modules/usb/../../dev/usb/uhci.c:1956
 #4  0xc07706a9 in uhci_timeout_task (addr=0x0) at /usr/src/sys/modules/usb/../../dev/usb/uhci.c:1534
 #5  0xc0769f1e in usb_task_thread (arg=0x0) at /usr/src/sys/modules/usb/../../dev/usb/usb.c:464
 #6  0xc04978cf in fork_exit (callout=0xc0769e80 <usb_task_thread>, arg=0x0, frame=0x0)
     at /usr/src/sys/kern/kern_fork.c:807
 #7  0xc05f414c in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:209