Date: Tue, 29 Sep 2009 14:13:47 -0700 (PDT) From: Ben Jackson <ben@ben.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/139243: unplug prolific USB serial -> uhci_abort_xfer: not in process context Message-ID: <200909292113.n8TLDl1W003955@kronos.home.ben.com> Resent-Message-ID: <200909292200.n8TM0BqL062140@freefall.freebsd.org>
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>Number: 139243
>Category: kern
>Synopsis: unplug prolific USB serial -> uhci_abort_xfer: not in process context
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Sep 29 22:00:11 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Ben Jackson
>Release: FreeBSD 7.2-STABLE amd64
>Organization:
>Environment:
System: FreeBSD kronos.home.ben.com 7.2-STABLE FreeBSD 7.2-STABLE #2: Tue Sep 15 22:53:16 PDT 2009 bjj@kronos.home.ben.com:/usr/obj/usr/src/sys/GENERIC amd64
Built from source on the day of the csup
>Description:
I have been using a Prolific USB serial adapter for a long time with
FreeBSD. It serves a faxmodem with mgetty. As soon as I unplugged it, the
kernel panicked. mgetty probably had it open at the time (it's in /etc/ttys)
Sep 28 11:25:48 kronos kernel: usb4: <UHCI (generic) USB controller> on uhci3
Sep 28 11:25:48 kronos kernel: usb4: USB revision 1.0
Sep 28 11:25:48 kronos kernel: uhub4: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb4
Sep 28 11:25:48 kronos kernel: uhub4: 2 ports with 2 removable, self powered
Sep 28 11:25:48 kronos kernel: uhci4: <UHCI (generic) USB controller> port 0xe400-0xe41f irq 19 at device 29.1 on pci0
Sep 28 11:25:48 kronos kernel: uhci4: [GIANT-LOCKED]
Sep 28 11:25:48 kronos kernel: uhci4: [ITHREAD]
Sep 28 11:25:48 kronos kernel: ucom0: <Prolific Technology Inc. USB-Serial Controller, class 0/0, rev 1.10/3.00, addr 2> on uhub4
...
Sep 29 13:17:40 kronos kernel: ucom0: ucomreadcb: IOERROR
Sep 29 13:20:40 kronos syslogd: kernel boot file is /boot/kernel/kernel
Sep 29 13:20:40 kronos kernel: ucom0: at uhub4 port 1 (addr 2) disconnected
Sep 29 13:20:40 kronos kernel: panic: uhci_abort_xfer: not in process context
Sep 29 13:20:40 kronos kernel: cpuid = 0
Sep 29 13:20:40 kronos kernel: Uptime: 1d1h52m8s
* 41 Thread 100040 (PID=40: usb4) doadump () at pcpu.h:195
(kgdb) bt
#0 doadump () at pcpu.h:195
#1 0x0000000000000004 in ?? ()
#2 0xffffffff8051b1e9 in boot (howto=260)
at /usr/src/sys/kern/kern_shutdown.c:418
#3 0xffffffff8051b5f2 in panic (fmt=0x104 <Address 0x104 out of bounds>)
at /usr/src/sys/kern/kern_shutdown.c:574
#4 0xffffffff8047c69b in uhci_abort_xfer (xfer=Variable "xfer" is not available.
)
at /usr/src/sys/dev/usb/uhci.c:2039
#5 0xffffffff8048d50c in usbd_abort_pipe (pipe=0xffffff0023a72400)
at /usr/src/sys/dev/usb/usbdi.c:881
#6 0xffffffff804882fa in uplcom_detach (self=Variable "self" is not available.
)
at /usr/src/sys/dev/usb/uplcom.c:565
#7 0xffffffff805445f4 in device_detach (dev=0xffffff0004050600)
at device_if.h:212
#8 0xffffffff8048b61a in usb_disconnect_port (up=0xffffff000373b7b8, parent=Variable "parent" is not available.
)
at /usr/src/sys/dev/usb/usb_subr.c:1376
#9 0xffffffff80481b9e in uhub_explore (dev=0xffffff000370ea00)
at /usr/src/sys/dev/usb/uhub.c:462
#10 0xffffffff8048990b in usb_discover (v=Variable "v" is not available.
) at /usr/src/sys/dev/usb/usb.c:724
#11 0xffffffff8048a8bc in usb_event_thread (arg=Variable "arg" is not available.
)
at /usr/src/sys/dev/usb/usb.c:440
#12 0xffffffff804f63e3 in fork_exit (
callout=0xffffffff8048a840 <usb_event_thread>, arg=0xffffff000373c480,
---Type <return> to continue, or q <return> to quit---
frame=0xffffff807723bc80) at /usr/src/sys/kern/kern_fork.c:811
#13 0xffffffff807c8fce in fork_trampoline ()
at /usr/src/sys/amd64/amd64/exception.S:554
(kgdb) list
2034 splx(s);
2035 return;
2036 }
2037
2038 if (xfer->device->bus->intr_context || !curproc)
2039 panic("uhci_abort_xfer: not in process context");
2040
2041 /*
2042 * If an abort is already in progress then just wait for it to
2043 * complete and return.
>How-To-Repeat:
Presumably just boot, start mgetty, unplug the USB serial adapter. I
have loaned it out (hence the unplug!) and will not be able to try a
repro until next week.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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