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Date: Thu, 23 Jan 2014 12:16:02 +0100 From: Veaceslav Falico <vfalico@...hat.com> To: netdev@...r.kernel.org Cc: Jay Vosburgh <fubar@...ibm.com>, Andy Gospodarek <andy@...yhouse.net>, Veaceslav Falico <vfalico@...hat.com> Subject: [PATCH net-next 0/2] bonding: fix locking in bond_ab_arp_probe Hi, After the latest patches, on every call of bond_ab_arp_probe() without an active slave I see the following warning: [ 7.912314] RTNL: assertion failed at net/core/dev.c (4494) ... [ 7.922495] [<ffffffff817acc6f>] dump_stack+0x51/0x72 [ 7.923714] [<ffffffff8168795e>] netdev_master_upper_dev_get+0x6e/0x70 [ 7.924940] [<ffffffff816a2a66>] rtnl_link_fill+0x116/0x260 [ 7.926143] [<ffffffff817acc6f>] ? dump_stack+0x51/0x72 [ 7.927333] [<ffffffff816a350c>] rtnl_fill_ifinfo+0x95c/0xb90 [ 7.928529] [<ffffffff8167af2b>] ? __kmalloc_reserve+0x3b/0xa0 [ 7.929681] [<ffffffff8167bfcf>] ? __alloc_skb+0x9f/0x1e0 [ 7.930827] [<ffffffff816a3b64>] rtmsg_ifinfo+0x84/0x100 [ 7.931960] [<ffffffffa00bca07>] bond_ab_arp_probe+0x1a7/0x370 [bonding] [ 7.933133] [<ffffffffa00bcd78>] bond_activebackup_arp_mon+0x1a8/0x2f0 [bonding] ... It happens because in bond_ab_arp_probe() we change the flags of a slave without holding the RTNL lock. To fix this - remove the useless curr_active_lock, RCUify it completely and lock RTNL while changing the slave's flags. CC: Jay Vosburgh <fubar@...ibm.com> CC: Andy Gospodarek <andy@...yhouse.net> CC: netdev@...r.kernel.org Signed-off-by: Veaceslav Falico <vfalico@...hat.com> --- drivers/net/bonding/bond_main.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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