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VK7AX > LINHAM 01.07.08 02:51l 101 Lines 2921 Bytes #999 (0) @ WW
BID : VK7AX-LI
Read: GUEST
Subj: Re: [ROSE] unregister_netdevice: waiting for rose0 to become
Path: IZ3LSV<IK2XDE<DB0RES<WA7V<VK7AX
Sent: 080701/0053Z @:VK7AX.#ULV.TAS.AUS.OC #:48309 [Ulverstone] FBB7.00g $:VK7A
From: VK7AX@VK7AX.#ULV.TAS.AUS.OC
To : LINHAM@WW
From: Pidoux <f6bvp(AT)free.fr>
Date: Mon, 30 Jun 2008 15:37:02 +0200
To: David Miller <davem(AT)davemloft.net>
CC: netdev(AT)vger.kernel.org, ralf(AT)linux-mips.org,
linux-hams(AT)vger.kernel.org
Some more precisions :
The same message in endless loop appears even if there are no more
routes using rose0 device as confirmed by route command
and after device rose0 is set down with ifconfig.
The only remaining things related to rose are in /proc/net/rose_nodes
and /proc/net/rose_neigh :
#cat /proc/net/rose_node
address mask n neigh neigh neigh
2080175524 0010 1 00001
#cat /proc/net/rose_neigh
addr callsign dev count use mode restart t0 tf digipeater
00001 RSLOOP-0 ??? 1 0 DCE yes 0 0
I can reboot the system if I do it before trying to remove rose module.
Not after, because of the waiting loop.
RSLOOP-0 rose_neigh is created as soon as rose module is loaded via
modprobe.
If I issue rmmod rose command immediately after loading it,
removal is successfull.
Thus it appears that rose_node with neigh 00001 is not destroyed
during one previous step.
Which one ?
Bernard Pidoux, f6bvp
Pidoux wrote :
> A bug in ROSE protocol is preventing removal of rose module.
>
> After killing all ROSE and AX25 applications, there are no more
> sockets and
> rose usage count is correctly decreased to null as seen in /proc/modules :
>
> rose 40120 0 - Live 0xe1071000
>
> However, issuing command rmmod rose displays the following message
> in loop forever :
>
> kernel: unregister_netdevice: waiting for rose0 to become free.
> Usage count = 2
>
> Usage count can be different and seems random (not correlated with
> module usage count reached when ROSE applications are loaded).
>
> Tracing the problem shows that above message is sent by core/dev.c
>
> Here is the loop :
>
> while (atomic_read(&dev->refcnt) !=0) {
> ....
> }
>
> Obviously, displayed usage count (dev->refcnt) is not the same as in
> /proc/modules or given by command lsmod and also it is not decremented,
> i.e. it stays at the same, and probably not relevant, value.
>
> A comment in core/dev.c says that buggy protocol don't correctly call dev_put().
>
> I tried to review rose module source but I have not been able to find
> a correct place where dev_put(dev) could be missing either
> in af_rose.c or rose_route.c.
>
> Maybe the problem is elsewhere ?
>
> Bernard Pidoux, f6bvp
> --
--
73 de Bernard, f6bvp
http://f6bvp.org
--
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Courtesy Tony VK7AX VK7AX(AT)VK7AX.#ULV.TAS.AUS.OC
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