Server Panic on: RIP: tcp_transmit_skb+44

Issue

• Server panicked on the following RIP:

RIP: tcp_transmit_skb+44

• After downloading and investigating the vmcore the following was found:

RIP  [<ffffffff80021bb4>] tcp_transmit_skb+0x2c/0x67e
 RSP <ffff81061ff2fe60>
crash> bt
PID: 0      TASK: ffff810c1fdd6100  CPU: 19  COMMAND: "swapper"
 #0 [ffff81061ff2fbc0] crash_kexec at ffffffff800afee7
 #1 [ffff81061ff2fc80] __die at ffffffff80065127
 #2 [ffff81061ff2fcc0] die at ffffffff8006c779
 #3 [ffff81061ff2fcf0] do_invalid_op at ffffffff8006cd39
 #4 [ffff81061ff2fdb0] error_exit at ffffffff8005dde9
    [exception RIP: tcp_transmit_skb+44]
    RIP: ffffffff80021bb4  RSP: ffff81061ff2fe60  RFLAGS: 00010246
    RAX: ffff81099e922500  RBX: ffff81012f69a080  RCX: 0000000000000220
    RDX: 0000000000000001  RSI: ffff810854636a80  RDI: ffff81012f69a080
    RBP: 0000000000000001   R8: 000000000000000f   R9: ffff81061ff29e38
    R10: 0000000000000001  R11: 0000000000000246  R12: ffff810854636a80
    R13: 0000000000000220  R14: ffff81012f69a080  R15: ffffffff802600bf
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #5 [ffff81061ff2fea8] tcp_retransmit_skb at ffffffff8025eaf1
 #6 [ffff81061ff2fee8] tcp_write_timer at ffffffff80260536
 #7 [ffff81061ff2ff08] run_timer_softirq at ffffffff80099b9d
 #8 [ffff81061ff2ff58] __do_softirq at ffffffff80012562
 #9 [ffff81061ff2ff88] call_softirq at ffffffff8005e2fc
#10 [ffff81061ff2ffa0] do_softirq at ffffffff8006d636
#11 [ffff81061ff2ffb0] apic_timer_interrupt at ffffffff8005dc8e
--- <IRQ stack> ---
#12 [ffff81061ff29e38] apic_timer_interrupt at ffffffff8005dc8e
    [exception RIP: mwait_idle_with_hints+102]
    RIP: ffffffff8006b9bf  RSP: ffff81061ff29ee8  RFLAGS: 00000246
    RAX: 0000000000000000  RBX: 00000000000000ff  RCX: 0000000000000000
    RDX: 0000000000000000  RSI: 0000000000000000  RDI: 0000000000000000
    RBP: 001dfb12b2a3b889   R8: ffff81061ff28000   R9: 000000000000002c
    R10: ffff81063512e190  R11: 0000000000000246  R12: ffff810921a5d7e0
    R13: ffff810c1fdd6100  R14: 0000000000000001  R15: 0000000000000000
    ORIG_RAX: ffffffffffffff10  CS: 0010  SS: 0018
#13 [ffff81061ff29ee8] mwait_idle at ffffffff80056c