Softlockup and freeze with bonding mode 6 and VLANs

Solution Verified - Updated -


  • Softlockups and freezes or even crashes occurs when using bonding mode 6 on a system that has VLANs.

    BUG: soft lockup - CPU#0 stuck for 10s! [swapper:0]
    Pid: 0, comm:              swapper
    EIP: 0060:[<c061dc4e>] CPU: 0
    EIP is at _spin_lock_bh+0xf/0x18
     EFLAGS: 00000286    Not tainted  (2.6.18-194.3.1.el5 #1)
    EAX: c0748000 EBX: f69fe550 ECX: f6f9a52c EDX: f69fe000
    ESI: f69fe4fc EDI: f69fe550 EBP: f69418c0 DS: 007b ES: 007b
    CR0: 8005003b CR2: 0069c270 CR3: 00742000 CR4: 000006d0
     [<f8b240ea>] rlb_arp_recv+0x98/0x11d [bonding]
     [<c05c0aa8>] netif_receive_skb+0x3ac/0x401
     [<f8a33bf8>] bnx2_poll_work+0xc3b/0xd45 [bnx2]
     [<c041000c>] mtrr_bp_init+0x1f7/0x21a
     [<c041db0c>] kmap_atomic_to_page+0x34/0x54
     [<c041f79d>] try_to_wake_up+0x3e8/0x3f2
     [<c043887c>] hrtimer_run_queues+0xef/0x176
     [<c042d5f5>] lock_timer_base+0x15/0x2f
     [<f8a3406f>] bnx2_poll+0xbd/0x1ce [bnx2]
     [<c05c2995>] net_rx_action+0x9c/0x1a7
     [<c042a377>] __do_softirq+0x87/0x114
     [<c04073cf>] do_softirq+0x52/0x9c
     [<c044f158>] __do_IRQ+0x0/0xd6
     [<c04074ce>] do_IRQ+0xb5/0xc3
     [<c0405946>] common_interrupt+0x1a/0x20
     [<c0403ce7>] mwait_idle+0x25/0x38
     [<c0403ca8>] cpu_idle+0x9f/0xb9
     [<c07099fa>] start_kernel+0x37b/0x383
  • System has eth0 configured as bond0 w/ (3) vlan tagging sub interfaces ==> live traffic and continuous ping tests show recurring packet loss.


  • Red Hat Enterprise Linux 5.5 or older

  • bonding with mode 6/ALB

  • using VLANs

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