Re: 'iw events' stops receiving events after a while on 4.9 + hacks
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2017-05-17 13:30:38
Also in:
linux-wireless
Possibly related (same subject, not in this thread)
- 2017-05-31 · Re: 'iw events' stops receiving events after a while on 4.9 + hacks · Ben Greear <hidden>
- 2017-05-31 · Re: 'iw events' stops receiving events after a while on 4.9 + hacks · Bastian Bittorf <hidden>
- 2017-05-16 · 'iw events' stops receiving events after a while on 4.9 + hacks · Ben Greear <hidden>
On Wed, 2017-05-17 at 12:08 +0200, Bastian Bittorf wrote:
* Ben Greear [off-list ref] [17.05.2017 11:51]:quoted
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