* [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown
@ 2016-03-19 12:55 Sven Eckelmann
2016-03-19 13:24 ` Sven Eckelmann
2016-03-27 7:08 ` Marek Lindner
0 siblings, 2 replies; 3+ messages in thread
From: Sven Eckelmann @ 2016-03-19 12:55 UTC (permalink / raw)
To: b.a.t.m.a.n
The shutdown of an batman-adv interface can happen with one of its slave
interfaces still being in the BATADV_IF_TO_BE_ACTIVATED state. A possible
reason for it is that the routing algorithm BATMAN_V was selected and
batadv_schedule_bat_ogm was not yet called for this interface. This slave
interface still has to be set to BATADV_IF_INACTIVE or the batman-adv
interface will never reduce its usage counter and thus never gets shutdown.
This problem can be simulated via:
$ modprobe dummy
$ modprobe batman-adv routing_algo=BATMAN_V
$ ip link add bat0 type batadv
$ ip link set dummy0 master bat0
$ ip link set dummy0 up
$ ip link del bat0
unregister_netdevice: waiting for bat0 to become free. Usage count = 3
Fixes: 88861ea9acb7 ("[batman-adv] replacing if up/down timer with kernel notifications")
Reported-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
Please check https://www.open-mesh.org/issues/248 to learn more about the
bug
I have not checked why batadv_schedule_bat_ogm isn't called successfully
(which would mark the interface as active) in this situation.
---
net/batman-adv/hard-interface.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 3240a67..f41b472 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -572,8 +572,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
struct batadv_hard_iface *primary_if = NULL;
- if (hard_iface->if_status == BATADV_IF_ACTIVE)
- batadv_hardif_deactivate_interface(hard_iface);
+ batadv_hardif_deactivate_interface(hard_iface);
if (hard_iface->if_status != BATADV_IF_INACTIVE)
goto out;
--
2.8.0.rc3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown
2016-03-19 12:55 [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown Sven Eckelmann
@ 2016-03-19 13:24 ` Sven Eckelmann
2016-03-27 7:08 ` Marek Lindner
1 sibling, 0 replies; 3+ messages in thread
From: Sven Eckelmann @ 2016-03-19 13:24 UTC (permalink / raw)
To: b.a.t.m.a.n, linus.luessing
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On Saturday 19 March 2016 13:55:21 Sven Eckelmann wrote:
> The shutdown of an batman-adv interface can happen with one of its slave
> interfaces still being in the BATADV_IF_TO_BE_ACTIVATED state. A possible
> reason for it is that the routing algorithm BATMAN_V was selected and
> batadv_schedule_bat_ogm was not yet called for this interface. This slave
> interface still has to be set to BATADV_IF_INACTIVE or the batman-adv
> interface will never reduce its usage counter and thus never gets shutdown.
>
> This problem can be simulated via:
>
> $ modprobe dummy
> $ modprobe batman-adv routing_algo=BATMAN_V
> $ ip link add bat0 type batadv
> $ ip link set dummy0 master bat0
> $ ip link set dummy0 up
> $ ip link del bat0
> unregister_netdevice: waiting for bat0 to become free. Usage count = 3
>
> Fixes: 88861ea9acb7 ("[batman-adv] replacing if up/down timer with kernel
> notifications") Reported-by: Matthias Schiffer
> <mschiffer@universe-factory.net>
> Signed-off-by: Sven Eckelmann <sven@narfation.org>
> ---
> Please check https://www.open-mesh.org/issues/248 to learn more about the
> bug
I just want to emphasize that this patch doesn't fix the bug behind issue #248
(only its main symptom described in the issue description). Please read the
ticket and especially https://www.open-mesh.org/issues/248#note-4
Kind regards,
Sven
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown
2016-03-19 12:55 [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown Sven Eckelmann
2016-03-19 13:24 ` Sven Eckelmann
@ 2016-03-27 7:08 ` Marek Lindner
1 sibling, 0 replies; 3+ messages in thread
From: Marek Lindner @ 2016-03-27 7:08 UTC (permalink / raw)
To: b.a.t.m.a.n
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On Saturday, March 19, 2016 13:55:21 Sven Eckelmann wrote:
> The shutdown of an batman-adv interface can happen with one of its slave
> interfaces still being in the BATADV_IF_TO_BE_ACTIVATED state. A possible
> reason for it is that the routing algorithm BATMAN_V was selected and
> batadv_schedule_bat_ogm was not yet called for this interface. This slave
> interface still has to be set to BATADV_IF_INACTIVE or the batman-adv
> interface will never reduce its usage counter and thus never gets shutdown.
>
> This problem can be simulated via:
>
> $ modprobe dummy
> $ modprobe batman-adv routing_algo=BATMAN_V
> $ ip link add bat0 type batadv
> $ ip link set dummy0 master bat0
> $ ip link set dummy0 up
> $ ip link del bat0
> unregister_netdevice: waiting for bat0 to become free. Usage count = 3
>
> Fixes: 88861ea9acb7 ("[batman-adv] replacing if up/down timer with kernel
> notifications") Reported-by: Matthias Schiffer
> <mschiffer@universe-factory.net>
> Signed-off-by: Sven Eckelmann <sven@narfation.org>
Applied in revision fbb98aa.
Thanks,
Marek
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-03-19 12:55 [B.A.T.M.A.N.] [PATCH] batman-adv: Deactive TO_BE_ACTIVATED hardif on shutdown Sven Eckelmann
2016-03-19 13:24 ` Sven Eckelmann
2016-03-27 7:08 ` Marek Lindner
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