On Wed, 2017-05-17 at 12:08 +0200, Bastian Bittorf wrote: > * Ben Greear <gree...@candelatech.com> [17.05.2017 11:51]: > > I have been keeping an 'iw events' program running with a perl > > script gathering its > > output and post-processing it. This has been working for several > > years on 4.7 and earlier > > kernels, but when testing on 4.9 overnight, I notice that 'iw > > events' is not showing any input. 'strace' shows > > that it is waiting on recvmsg. If I start a second 'iw events' > > then it will get > > wifi events as expected. > > me too, also seen on 4.4 - i'am happy for debug ideas.
I've never seen this. Does it happen when it's very long-running? Or when there are lots of events? Perhaps something in the socket buffer accounting is going wrong, so that it's slowly decreasing to 0? johannes
