[Spice-devel] Dead lock in usbredir

[Christophe Fergeau]

Hey,

Thanks to the detailed description. Adding Hans to cc: since he knows
USB redirection the best.

Christophe

On Tue, Dec 16, 2014 at 10:36:12AM +0800, hustxyj at sina.com wrote:
> I met a dead lock in usbredir. When a device with interrupt  endpoint
> was plugged in, the func usbredirhost_start_interrupt_receiving may be
> called, which locked the host first. Then submitted the transfer and
> call usbi_fd_notification, which called libusb_lock_events(ctx).
> Another thread "spice_usb_device_manager_usb_ev_thread" handled events
> from libusb. which lock the events(libusb_lock_events) first. Then
> func usbredirhost_buffered_packet_complete may be called which locked
> the host. This may cause deadlock!I had meet this several times. I
> think usbredirhost should lock the event lock before lock host.
> Thx!Yongjian Xu.

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