netdev - Re: [BUG] bonding : LOCKDEP warning

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Date:	Sat, 22 Oct 2011 11:05:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: [BUG] bonding : LOCKDEP warning

Le samedi 22 octobre 2011 à 01:43 -0700, Eric W. Biederman a écrit :
> Eric Dumazet <eric.dumazet@...il.com> writes:
> 
> > On latest net-next I got following splat
> 
> Eric it is going to be a little bit before I can test this but I believe
> we just need the one fix in the patch below.  Can you verify this fixes
> your lockdep issue.
> 
> Thanks,
> 
> Eric
> 
> 
> From 60aeafd8976a1117e118574ada44a79b69c75e70 Mon Sep 17 00:00:00 2001
> From: Eric W. Biederman <ebiederm@...ssion.com>
> Date: Sat, 22 Oct 2011 01:36:18 -0700
> Subject: [PATCH] bonding:  Add a forgetten sysfs_attr_init on class_attr_bonding_masters
> 
> When I made class_attr_bonding_matters per network namespace and dynamically
> allocated I overlooked the need for calling sysfs_attr_init.  Oops.
> 
> This fixes the following lockdep splat:
> 
> [    5.749651] bonding: Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
> [    5.749655] bonding: MII link monitoring set to 100 ms
> [    5.749676] BUG: key f49a831c not in .data!
> [    5.749677] ------------[ cut here ]------------
> [    5.749752] WARNING: at kernel/lockdep.c:2897 lockdep_init_map+0x1c3/0x460()
> [    5.749809] Hardware name: ProLiant BL460c G1
> [    5.749862] Modules linked in: bonding(+)
> [    5.749978] Pid: 3177, comm: modprobe Not tainted 3.1.0-rc9-02177-gf2d1a4e-dirty #1157
> [    5.750066] Call Trace:
> [    5.750120]  [<c1352c2f>] ? printk+0x18/0x21
> [    5.750176]  [<c103112d>] warn_slowpath_common+0x6d/0xa0
> [    5.750231]  [<c1060133>] ? lockdep_init_map+0x1c3/0x460
> [    5.750287]  [<c1060133>] ? lockdep_init_map+0x1c3/0x460
> [    5.750342]  [<c103117d>] warn_slowpath_null+0x1d/0x20
> [    5.750398]  [<c1060133>] lockdep_init_map+0x1c3/0x460
> [    5.750453]  [<c1355ddd>] ? _raw_spin_unlock+0x1d/0x20
> [    5.750510]  [<c11255c8>] ? sysfs_new_dirent+0x68/0x110
> [    5.750565]  [<c1124d4b>] sysfs_add_file_mode+0x8b/0xe0
> [    5.750621]  [<c1124db3>] sysfs_add_file+0x13/0x20
> [    5.750675]  [<c1124e7c>] sysfs_create_file+0x1c/0x20
> [    5.750737]  [<c1208f09>] class_create_file+0x19/0x20
> [    5.750794]  [<c12c186f>] netdev_class_create_file+0xf/0x20
> [    5.750853]  [<f85deaf4>] bond_create_sysfs+0x44/0x90 [bonding]
> [    5.750911]  [<f8410947>] ? bond_create_proc_dir+0x1e/0x3e [bonding]
> [    5.750970]  [<f841007e>] bond_net_init+0x7e/0x87 [bonding]
> [    5.751026]  [<f8410000>] ? 0xf840ffff
> [    5.751080]  [<c12abc7a>] ops_init.clone.4+0xba/0x100
> [    5.751135]  [<c12abdb2>] ? register_pernet_subsys+0x12/0x30
> [    5.751191]  [<c12abd03>] register_pernet_operations.clone.3+0x43/0x80
> [    5.751249]  [<c12abdb9>] register_pernet_subsys+0x19/0x30
> [    5.751306]  [<f84108b9>] bonding_init+0x832/0x8a2 [bonding]
> [    5.751363]  [<c10011f0>] do_one_initcall+0x30/0x160
> [    5.751420]  [<f8410087>] ? bond_net_init+0x87/0x87 [bonding]
> [    5.751477]  [<c106d5cf>] sys_init_module+0xef/0x1890
> [    5.751533]  [<c1356490>] sysenter_do_call+0x12/0x36
> [    5.751588] ---[ end trace 89f492d83a7f5006 ]---
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
> ---
>  drivers/net/bonding/bond_sysfs.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
> index 6044ff8..5a20804 100644
> --- a/drivers/net/bonding/bond_sysfs.c
> +++ b/drivers/net/bonding/bond_sysfs.c
> @@ -1675,6 +1675,7 @@ int bond_create_sysfs(struct bond_net *bn)
>  	int ret;
>  
>  	bn->class_attr_bonding_masters = class_attr_bonding_masters;
> +	sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
>  
>  	ret = netdev_class_create_file(&bn->class_attr_bonding_masters);
>  	/*


Reported-and-tested-by: Eric Dumazet <eric.dumazet@...il.com>

Thanks a lot Eric !


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