[Qemu-devel] [Bug 1837651] [NEW] -netdev socket uses 100% cpu on Windows host

[Randy Rhoads]

Public bug reported:

On Windows hosts, any `-netdev socket` option (tcp listen, tcp connect,
udp passing a fd) causes qemu to use 100% cpu. The guest still runs, but
only sluggishly.

A simple testcase is:

> qemu-system-i386.exe -netdev socket,listen=:8000,id=n

And, in another command prompt:

> echo foo | nc.exe localhost 8000

Where nc.exe is netcat.

Tested on qemu 3.1 (from https://qemu.weilnetz.de/w64/) and 4.0 (self
compiled).

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1837651

Title:
  -netdev socket uses 100% cpu on Windows host

Status in QEMU:
  New

Bug description:
  On Windows hosts, any `-netdev socket` option (tcp listen, tcp
  connect, udp passing a fd) causes qemu to use 100% cpu. The guest
  still runs, but only sluggishly.

  A simple testcase is:

  > qemu-system-i386.exe -netdev socket,listen=:8000,id=n

  And, in another command prompt:

  > echo foo | nc.exe localhost 8000

  Where nc.exe is netcat.

  Tested on qemu 3.1 (from https://qemu.weilnetz.de/w64/) and 4.0 (self
  compiled).

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1837651/+subscriptions