Hello, please take a look on http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg00600.html, I had reported the simular issue for recent emulator versions. It would be good if this particular problem can achieve more votes, because I have not enough knowledge to fix it by myself.
- [Qemu-devel] qemu guest stalls with lots of PTY writes Stephen Su
- Re: [Qemu-devel] qemu guest stalls with lots of PTY w... Andrey Korolyov