iw: hanging when doing station or mpath dump

iw: hanging when doing station or mpath dump

[Andrey Yurovsky]

We noticed that iw hangs after running "station dump" or "mpath dump"
commands.  The expected output is displayed before the hang.  For
example:

# iw dev mesh station dump

...will display stations (if any) and then hang until iw is killed.
According to strace, iw is waiting on the netlink socket like this:

recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"\24\0\0\0\3\0\2\0C\256\2I\27\20\0\0\0\0\0\0\0\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 20
recvmsg(3,

...which never returns.  This seems to be a somewhat recent regression
but we haven't had a chance to look more closely into it so I'm
mentioning it here in case someone has an idea of what could have gone
wrong.  Thanks,

  -Andrey

Re: iw: hanging when doing station or mpath dump

[Johannes Berg]

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On Fri, 2008-10-24 at 14:32 -0700, Andrey Yurovsky wrote:

> ...which never returns.  This seems to be a somewhat recent regression
> but we haven't had a chance to look more closely into it so I'm
> mentioning it here in case someone has an idea of what could have gone
> wrong.  Thanks,

I _just_ fixed this a few hours ago.

johannes

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