Hey, I've managed to reproduce it on 2.7 from jessie-backports again, and the assert is...
qemu-system-x86_64: /build/qemu-1VqMQS/qemu-2.7+dfsg/hw/usb/core.c:584: usb_packet_copy: Assertion `p->actual_length + bytes <= iov->size' failed. Also, this has been known to happen when adding the USB device, leaving the VM in a 'Shutoff (Crashed)' state. I'm not sure if it's related. *** Error in `qemu-system-x86_64': double free or corruption (!prev): 0x00007f45d2b3a200 *** and ... *** Error in `qemu-system-x86_64': double free or corruption (!prev): 0x00007fa2cd10b560 *** I'll try the 2.8 version shortly! Cheers Kyle On Mon, Jan 2, 2017 at 11:06 AM Michael Tokarev <m...@tls.msk.ru> wrote: 02.01.2017 13:57, Kyle Gordon wrote: > Hi Michael, > > Thanks for the response. I have tried upgrading qemu* to > 2.7+dfsg-3~bpo8+2 from jessie-backports, and the behaviour is > unfortunately the same. I haven't tried upgrading the system to Stretch > yet, as that might be a bit of a one way road! Hmm... I see. I re-read you first message, and it turns out I missed the info about the bpo version. Please excuse me for that, that's ENOCOFFEE :) This smells like something specific to this usb device. Did you try other devices? The thing is that usb passthrough generally works. Can you also please show where it asserts out in case of 2.7 version from bpo? Also there's 2.8 version built for bpo (but not uploaded yet, since 2.8 hasn't been entered -testing), available at http://www.corpit.ru/debian/tls/qemu/qemu-system-x86_2.8+dfsg-1~bpo8+1_amd64.deb which can be of interest in this context too, but this might be too much for you to try (this version is built with gtk and virgl support, so there will be other deps). Thanks, /mjt
