Re: [Qemu-devel] qemu assertion failed with usb on current git master!

[Erik Rull <erik.rull@rdsoftware.de>]

Gerd Hoffmann wrote:
>    Hi,
>
>> I'm really sorry, but I don't understand what's happening - I copied the
>> qemu executable on my target system before executing it, but gdb complains
>> that the core file does not match the executable! But except the file paths
>> they are identical.
>
>> warning: core file may not match specified executable file.
>> Core was generated by `/disc/qemu-system-x86_64 -machine kernel_irqchip=on
>> -serial /dev/ttyS2 -usb -de'.
>> Program terminated with signal 6, Aborted.
>> #0  0xffffe424 in __kernel_vsyscall ()
>
> Strange.  The backtrace is bogus too.
>
>> I don't know how to proceed here.
>
> Lets try plan b: add a printf right before the assert:
>
> --- a/hw/usb.c
> +++ b/hw/usb.c
> @@ -356,6 +356,7 @@ void usb_packet_complete(USBDevice *dev, USBPacket *p)
>
>       while (!QTAILQ_EMPTY(&ep->queue)) {
>           p = QTAILQ_FIRST(&ep->queue);
> +        fprintf(stderr, "%s: packet %p\n", __func__, p);
>           assert(p->state == USB_PACKET_QUEUED);
>           ret = usb_process_one(p);
>           if (ret == USB_RET_ASYNC) {
>
>
>> Don't you run into this problem (crash on USB plug in) on your system?
>> I tested it with a Linux guest, there it does not crash! Only with a
>> Windows XP guest!
>
> I test with Linux most of the time, but even with windows xp guest it
> doesn't reproduce here.
>
> cheers,
>    Gerd
>

That's a good idea - will test that tomorrow and send the new result file.
Have you ever tested a USB CD or DVD drive attached to your guests? I have 
issues with Windows XP (I get everything running and detected beside the 
drive letter in Windows Explorer) but it works fine for Linux.

Best regards,

Erik