Also could you please provide the exact command line that you use to start QEMU?
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1054180 Title: DNS activity in slirp (user networking) mode quickly depletes file descriptors and crashes qemu Status in QEMU: Incomplete Bug description: Hi, we have encountered quite some trouble with filedescriptor depletion of the qemu process. We have figured out that it can be demonstrated easily by doing a lot of DNS queries inside the VM -- in our real world scenario this is caused by running centos network install with a fast mirror. This situation is further problematic because qemu can't handle fd depletion very well: 1) if ulimit is 1024 then qemu hangs in infinite loop whenever it tries to open the 1025th fd 2) setting ulimit >1024 does not help that much because qemu uses select and max. fd set size is 1024 per default => qemu crashes because of buffer overflow in select() 3) setting ulimit > 1024 AND recompiling with large enough fd set size AND disabling gcc's fortify source seems to work, but that's really just a hot-fix The problem can be replicated quite easily by running something like while :; do echo >/dev/udp/10.0.2.3/53; done inside a Linux VM -- crash comes very soon. This problem is present in current qemu (1.2.0) and in earlier as well. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1054180/+subscriptions
