Hello Lukas, On Tue, Aug 3, 2021 at 3:42 AM Lukas Straub <lukasstra...@web.de> wrote: > Hi, > There is an easier explanation: I forgot the send side of multifd > altogether (I thought it was covered by migration_channel_connect()). > So yank won't actually shutdown() the multifd sockets on the send side.
If I could get that correctly, it seems to abort migration (and therefore close all fds) if the ft that ends up qio_channel_shutdown() get to sendmsg(), which can take a while. But it really does not close thew fds before that. > > In the bugreport you wrote > > (As a test, I called qio_channel_shutdown() in every multifd iochannel and > > yank worked just fine, but I could not retry migration, because it was > > still 'ongoing') > That sounds like a bug in the error handling for multifd. But quickly > looking at the code, it should properly fail the migration. In the end, just asking each thread to just exit ended up getting me a smoother migration abort. > > BTW: You can shutdown outgoing sockets from outside of qemu with the > 'ss' utility, like this: 'sudo ss -K dst <destination ip> dport = > <destination port>' Very nice tool, thanks for sharing! > > Regards, > Lukas Straub Best regards, Leonardo Bras
