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SubjectRe: USBDEVFS_RESET deadlocks USB bus.
On Fri, Jun 04, 2004 at 12:52:47PM -0700, Greg KH wrote:
> On Fri, Jun 04, 2004 at 03:39:11PM -0400, Zephaniah E. Hull wrote:
> > Starting at 2.6.7-rc1 or so (that is when we first noticed it) the new
> > pilot-link libusb back end started deadlocking the entire USB bus that
> > the palm device was on.
> >
> > I have finally tracked it down to happening when we make the
> > USBDEVFS_RESET ioctl, we never return from it and from that point on the
> > bus in question is completely dead, no processing is done, no
> > notifications of devices being plugged in or unplugged.
> >
> > This is still happening in 2.6.7-rc2-mm1.
> >
> > It seems to happen with both the UHCI and OHCI back ends, so it is
> > probably above that.
> >
> > Given that there were heavy locking changes, I suspect that the case in
> > question got screwed up somehow.
> This needs to go to the linux-usb-devel list, now CC:

> Anyway, can you look at the output of SysRq-T and see where the
> processes are hung?

lt-pilot-xfer D 00000000 0 11415 2709 (NOTLB)
d2ad3eb0 00000086 c022391a 00000000 3231203a 000a2e35 00000001 d2ad3ea7
d4edd000 d7fc8a00 c8449790 00000000 abb31900 000f447a c4bae4b8 c977d824
00000246 d2ad2000 d2ad3eec c0336735 c977d82c c4bae310 00000001 c4bae310
Call Trace:
[<c0336735>] __down+0x85/0x120
[<c033692f>] __down_failed+0xb/0x14
[<c026af27>] .text.lock.hub+0x69/0x82
[<c0272b7f>] usbdev_ioctl+0x19f/0x710
[<c015a45d>] file_ioctl+0x5d/0x170
[<c015a686>] sys_ioctl+0x116/0x250
[<c0103f8f>] syscall_call+0x7/0xb

This is on 2.6.7-rc2-mm1.

Please keep me in the reply list if we are pulled off of linux-kernel,
as I am not currently on linux-usb-devel.

1024D/E65A7801 Zephaniah E. Hull <>
92ED 94E4 B1E6 3624 226D 5727 4453 008B E65A 7801
CCs of replies from mailing lists are requested.

<cas> well there ya go. say something stupid in irc and have it
immortalised forever in someone's .sig file
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