Wed, Nov 13, 2019 at 02:26:47PM CET, petrm(a)mellanox.com wrote:
>On systems where carrier is gained very quickly, there is a race between
>teamd and the kernel that sometimes leads to all team slaves being stuck in
>When a port is enslaved to a team device, the kernel sends a netlink
>message marking the port as enabled. teamd's lb_event_watch_port_added()
>calls team_set_port_enabled(false), because link is down at that point. The
>kernel responds with a message marking the port as disabled. At this point,
>there are two outstanding messages: the initial one marking port as
>enabled, and the second one marking it as disabled. teamd has not processed
>either of these.
>Next teamd gets the netlink message that sets enabled=true, and updates its
>internal cache accordingly. If at this point ethtool link-watch wakes up,
>teamd considers (in teamd_port_check_enable()) enabling the port. After
>consulting the cache, it concludes the port is already up, and neglects to
>do so. Only then does teamd get the netlink message informing it of setting
>The problem is that the teamd cache is not synchronous with respect to the
>kernel state. If the carrier takes a while to come up (as is normally the
>case), this is not a problem, because teamd caches up quickly enough. But
>this may not always be the case, and particularly on a simulated system,
>the carrier is gained almost immediately.
>Fix this by not suppressing the enablement message.
>Signed-off-by: Petr Machata <petrm(a)mellanox.com>
Good morning and happy Friday,
Since a recent update, teamd now has one of my CPU cores stuck at 100%
cpu usage all the time. I did not change any configuration, just ran
updates. I also posted the bug here
https://bugzilla.redhat.com/show_bug.cgi?id=1873128 with additional
details like ltrace and strace. I hope you don't mind me asking here
too. I saw on github someone said you may not check the other bug
report sites and we should post bugs to the mailing list. They
actually said they sent the bug here, but I searched the archives and
did not see it. I apologize if they did already send it.