Date: Fri, 6 Jul 2007 20:40:11 GMT From: "Victor Liu" <victor.liu@gmail.com> To: freebsd-usb@FreeBSD.org Subject: Re: usb/114310: USB hub attachment panics kernel during libusb device scan Message-ID: <200707062040.l66KeBE7033521@freefall.freebsd.org>
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The following reply was made to PR usb/114310; it has been noted by GNATS. From: "Victor Liu" <victor.liu@gmail.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-usb@freebsd.org, bug-followup@freebsd.org Subject: Re: usb/114310: USB hub attachment panics kernel during libusb device scan Date: Fri, 6 Jul 2007 13:08:05 -0700 Here is the code I just used to panic it just now (requires libusb): /////////// usbtest.c: #include "/usr/local/include/usb.h" int main(int argc, char **argv){ while(1){ usb_init (); usb_find_busses (); usb_find_devices (); } return 0; } //////////// Makefile: CC=gcc LD=ld CFLAGS = -g -c -Wall all: usbtest.o $(CC) -o usbtest usbtest.o /usr/local/lib/libusb.a clean: rm -f usbtest usbtest.tgz *.o *~ It took me about 15 plug-in/unplug cycles to get it to crash (sometimes as many as 30 during previous testing when I'm unlucky). There's about a 200ms window during which the panic will occur, and it's hard to say exactly when that is. You can probably add a printf to given an indication of where in the loop you're plugging in the hub, so you can change the timing around a bit. -victor On 7/6/07, M. Warner Losh <imp@bsdimp.com> wrote: > Thanks for the update Victor. > > I can't get it to happen in current. Maybe I'm doing something > differently than you. Do you have an easy recipe for causing the > panic? > > Warner > > In message: <a58ca4220707061007w66ff866esba5adbd4781ac7ed@mail.gmail.com> > "Victor Liu" <victor.liu@gmail.com> writes: > : Managed to find a newer box, and yes, I could duplicate the panic > : within less than 10 attachments. uname -a: > : FreeBSD xxxxxxxxxxxxxxxxxx 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan > : 12 11:05:30 UTC 2007 > : xxxxxxxxxxxxxxxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/SMP i386 > : > : -victor > : > : On 7/4/07, M. Warner Losh <imp@bsdimp.com> wrote: > : > The following reply was made to PR usb/114310; it has been noted by GNATS. > : > > : > From: "M. Warner Losh" <imp@bsdimp.com> > : > To: victor.liu@gmail.com > : > Cc: freebsd-gnats-submit@FreeBSD.org > : > Subject: Re: usb/114310: USB hub attachment panics kernel during libusb > : > device scan > : > Date: Wed, 04 Jul 2007 22:03:35 -0600 (MDT) > : > > : > Would you happen to know if this happens on FreeBSD -current? > : > > : > Warner > : > _______________________________________________ > : > freebsd-usb@freebsd.org mailing list > : > http://lists.freebsd.org/mailman/listinfo/freebsd-usb > : > To unsubscribe, send any mail to "freebsd-usb-unsubscribe@freebsd.org" > : > > : > : >
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