• WANG Cong's avatar
    net: use for_each_netdev_safe() in rtnl_group_changelink() · 2b14e138
    WANG Cong authored
    commit d079535d upstream.
    
    In case we move the whole dev group to another netns,
    we should call for_each_netdev_safe(), otherwise we get
    a soft lockup:
    
     NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [ip:798]
     irq event stamp: 255424
     hardirqs last  enabled at (255423): [<ffffffff81a2aa95>] restore_args+0x0/0x30
     hardirqs last disabled at (255424): [<ffffffff81a2ad5a>] apic_timer_interrupt+0x6a/0x80
     softirqs last  enabled at (255422): [<ffffffff81079ebc>] __do_softirq+0x2c1/0x3a9
     softirqs last disabled at (255417): [<ffffffff8107a190>] irq_exit+0x41/0x95
     CPU: 0 PID: 798 Comm: ip Not tainted 4.0.0-rc4+ #881
     Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
     task: ffff8800d1b88000 ti: ffff880119530000 task.ti: ffff880119530000
     RIP: 0010:[<ffffffff810cad11>]  [<ffffffff810cad11>] debug_lockdep_rcu_enabled+0x28/0x30
     RSP: 0018:ffff880119533778  EFLAGS: 00000246
     RAX: ffff8800d1b88000 RBX: 0000000000000002 RCX: 0000000000000038
     RDX: 0000000000000000 RSI: ffff8800d1b888c8 RDI: ffff8800d1b888c8
     RBP: ffff880119533778 R08: 0000000000000000 R09: 0000000000000000
     R10: 0000000000000000 R11: 000000000000b5c2 R12: 0000000000000246
     R13: ffff880119533708 R14: 00000000001d5a40 R15: ffff88011a7d5a40
     FS:  00007fc01315f740(0000) GS:ffff88011a600000(0000) knlGS:0000000000000000
     CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
     CR2: 00007f367a120988 CR3: 000000011849c000 CR4: 00000000000007f0
     Stack:
      ffff880119533798 ffffffff811ac868 ffffffff811ac831 ffffffff811ac828
      ffff8801195337c8 ffffffff811ac8c9 ffff8801195339b0 ffff8801197633e0
      0000000000000000 ffff8801195339b0 ffff8801195337d8 ffffffff811ad2d7
     Call Trace:
      [<ffffffff811ac868>] rcu_read_lock+0x37/0x6e
      [<ffffffff811ac831>] ? rcu_read_unlock+0x5f/0x5f
      [<ffffffff811ac828>] ? rcu_read_unlock+0x56/0x5f
      [<ffffffff811ac8c9>] __fget+0x2a/0x7a
      [<ffffffff811ad2d7>] fget+0x13/0x15
      [<ffffffff811be732>] proc_ns_fget+0xe/0x38
      [<ffffffff817c7714>] get_net_ns_by_fd+0x11/0x59
      [<ffffffff817df359>] rtnl_link_get_net+0x33/0x3e
      [<ffffffff817df3d7>] do_setlink+0x73/0x87b
      [<ffffffff810b28ce>] ? trace_hardirqs_off+0xd/0xf
      [<ffffffff81a2aa95>] ? retint_restore_args+0xe/0xe
      [<ffffffff817e0301>] rtnl_newlink+0x40c/0x699
      [<ffffffff817dffe0>] ? rtnl_newlink+0xeb/0x699
      [<ffffffff81a29246>] ? _raw_spin_unlock+0x28/0x33
      [<ffffffff8143ed1e>] ? security_capable+0x18/0x1a
      [<ffffffff8107da51>] ? ns_capable+0x4d/0x65
      [<ffffffff817de5ce>] rtnetlink_rcv_msg+0x181/0x194
      [<ffffffff817de407>] ? rtnl_lock+0x17/0x19
      [<ffffffff817de407>] ? rtnl_lock+0x17/0x19
      [<ffffffff817de44d>] ? __rtnl_unlock+0x17/0x17
      [<ffffffff818327c6>] netlink_rcv_skb+0x4d/0x93
      [<ffffffff817de42f>] rtnetlink_rcv+0x26/0x2d
      [<ffffffff81830f18>] netlink_unicast+0xcb/0x150
      [<ffffffff8183198e>] netlink_sendmsg+0x501/0x523
      [<ffffffff8115cba9>] ? might_fault+0x59/0xa9
      [<ffffffff817b5398>] ? copy_from_user+0x2a/0x2c
      [<ffffffff817b7b74>] sock_sendmsg+0x34/0x3c
      [<ffffffff817b7f6d>] ___sys_sendmsg+0x1b8/0x255
      [<ffffffff8115c5eb>] ? handle_pte_fault+0xbd5/0xd4a
      [<ffffffff8100a2b0>] ? native_sched_clock+0x35/0x37
      [<ffffffff8109e94b>] ? sched_clock_local+0x12/0x72
      [<ffffffff8109eb9c>] ? sched_clock_cpu+0x9e/0xb7
      [<ffffffff810cadbf>] ? rcu_read_lock_held+0x3b/0x3d
      [<ffffffff811ac1d8>] ? __fcheck_files+0x4c/0x58
      [<ffffffff811ac946>] ? __fget_light+0x2d/0x52
      [<ffffffff817b8adc>] __sys_sendmsg+0x42/0x60
      [<ffffffff817b8b0c>] SyS_sendmsg+0x12/0x1c
      [<ffffffff81a29e32>] system_call_fastpath+0x12/0x17
    
    Fixes: e7ed828f ("netlink: support setting devgroup parameters")
    Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
    2b14e138
rtnetlink.c 52 KB