• Neil Horman's avatar
    bonding: prevent deadlock on slave store with alb mode (v3) · 9fe0617d
    Neil Horman authored
    This soft lockup was recently reported:
    
    [root@dell-per715-01 ~]# echo +bond5 > /sys/class/net/bonding_masters
    [root@dell-per715-01 ~]# echo +eth1 > /sys/class/net/bond5/bonding/slaves
    bonding: bond5: doing slave updates when interface is down.
    bonding bond5: master_dev is not up in bond_enslave
    [root@dell-per715-01 ~]# echo -eth1 > /sys/class/net/bond5/bonding/slaves
    bonding: bond5: doing slave updates when interface is down.
    
    BUG: soft lockup - CPU#12 stuck for 60s! [bash:6444]
    CPU 12:
    Modules linked in: bonding autofs4 hidp rfcomm l2cap bluetooth lockd sunrpc
    be2d
    Pid: 6444, comm: bash Not tainted 2.6.18-262.el5 #1
    RIP: 0010:[<ffffffff80064bf0>]  [<ffffffff80064bf0>]
    .text.lock.spinlock+0x26/00
    RSP: 0018:ffff810113167da8  EFLAGS: 00000286
    RAX: ffff810113167fd8 RBX: ffff810123a47800 RCX: 0000000000ff1025
    RDX: 0000000000000000 RSI: ffff810123a47800 RDI: ffff81021b57f6f8
    RBP: ffff81021b57f500 R08: 0000000000000000 R09: 000000000000000c
    R10: 00000000ffffffff R11: ffff81011d41c000 R12: ffff81021b57f000
    R13: 0000000000000000 R14: 0000000000000282 R15: 0000000000000282
    FS:  00002b3b41ef3f50(0000) GS:ffff810123b27940(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    CR2: 00002b3b456dd000 CR3: 000000031fc60000 CR4: 00000000000006e0
    
    Call Trace:
     [<ffffffff80064af9>] _spin_lock_bh+0x9/0x14
     [<ffffffff886937d7>] :bonding:tlb_clear_slave+0x22/0xa1
     [<ffffffff8869423c>] :bonding:bond_alb_deinit_slave+0xba/0xf0
     [<ffffffff8868dda6>] :bonding:bond_release+0x1b4/0x450
     [<ffffffff8006457b>] __down_write_nested+0x12/0x92
     [<ffffffff88696ae4>] :bonding:bonding_store_slaves+0x25c/0x2f7
     [<ffffffff801106f7>] sysfs_write_file+0xb9/0xe8
     [<ffffffff80016b87>] vfs_write+0xce/0x174
     [<ffffffff80017450>] sys_write+0x45/0x6e
     [<ffffffff8005d28d>] tracesys+0xd5/0xe0
    
    It occurs because we are able to change the slave configuarion of a bond while
    the bond interface is down.  The bonding driver initializes some data structures
    only after its ndo_open routine is called.  Among them is the initalization of
    the alb tx and rx hash locks.  So if we add or remove a slave without first
    opening the bond master device, we run the risk of trying to lock/unlock a
    spinlock that has garbage for data in it, which results in our above softlock.
    
    Note that sometimes this works, because in many cases an unlocked spinlock has
    the raw_lock parameter initialized to zero (meaning that the kzalloc of the
    net_device private data is equivalent to calling spin_lock_init), but thats not
    true in all cases, and we aren't guaranteed that condition, so we need to pass
    the relevant spinlocks through the spin_lock_init function.
    
    Fix it by moving the spin_lock_init calls for the tx and rx hashtable locks to
    the ndo_init path, so they are ready for use by the bond_store_slaves path.
    
    Change notes:
    v2) Based on conversation with Jay and Nicolas it seems that the ability to
    enslave devices while the bond master is down should be safe to do.  As such
    this is an outlier bug, and so instead we'll just initalize the errant spinlocks
    in the init path rather than the open path, solving the problem.  We'll also
    remove the warnings about the bond being down during enslave operations, since
    it should be safe
    
    v3) Fix spelling error
    Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
    Reported-by: jtluka@redhat.com
    CC: Jay Vosburgh <fubar@us.ibm.com>
    CC: Andy Gospodarek <andy@greyhouse.net>
    CC: nicolas.2p.debian@gmail.com
    CC: "David S. Miller" <davem@davemloft.net>
    Signed-off-by: default avatarJay Vosburgh <fubar@us.ibm.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    9fe0617d
bond_sysfs.c 42.9 KB