skb_over_panic after add_grhead

Solution Verified - Updated -

Issue

  • skb_over_panic after add_grhead
  • The following messages are logged:
skbuff: skb_over_panic: text:ffffffff815c86c1 len:3776 put:20 head:ffff88202879c000 data:ffff88202879c010 tail:0xed0 end:0xec0 dev:team2.600
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:128!
invalid opcode: 0000 [#1] SMP 
  • Kernel panic with backtrace similar to:
[exception RIP: skb_panic+0x63]
    skb_put at ffffffff814ec006
    add_grhead at ffffffff815c86c1
    add_grec at ffffffff815c96bc
    mld_ifc_timer_expire at ffffffff815c9d7b
    call_timer_fn at ffffffff8107df56
    run_timer_softirq at ffffffff8107fdcf
    __do_softirq at ffffffff81077b2f
    call_softirq at ffffffff816156dc
    do_softirq at ffffffff81015d95
    irq_exit at ffffffff81077ec5
    smp_apic_timer_interrupt at ffffffff81616355
    apic_timer_interrupt at ffffffff81614a1d

Environment

  • Red Hat Enterprise Linux 7.1 or earlier
  • Kernel series 3.10.0-229.el7 or earlier
  • Network interface with MTU larger than standard 1500 (aka Jumbo Frames)
  • Many IPv6 multicast subscriptions

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