Bug #1335444 “qemu loses serial console data on EAGAIN” : Bugs : QEMU

When running a guest OS with a serial console under "qemu-system-i386 -nographic", parts of the serial console output are sometimes lost. This happens when a write() to standard output by qemu returns EAGAIN, as may be the case when the guest is generating console output faster than the tty (or pty/pipe/socket, etc.) connected to qemu's standard output accepts it. The bug affects all releases of qemu since 1.5, which was the first version to set stdout to O_NONBLOCK mode. Version 1.4.2 and...