# Pastebin zydYDez3

--packet received
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x0
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80
e1000e_send_msi: causes 0x80, msi_causes_pending 0
e1000e_send_msi: going to send MSI
e1000e_irq_rearm_timer Mitigation timer armed for register 0xC4, delay 1024000 ns
e1000e_irq_msi_notify MSI notify 0x80
msi_notify:328 e1000e:18 notify vector 0x0 address: 0xfee00000 data: 0x30
--MSI fired, mitigation timer started

--packet received
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000080
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80000080
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
--no new cause, ICR already has pending IRQ

--guest has started handling irq, ICR gets cleared to 0 at top of handler

--packet received
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x10, ICR: 0x0
e1000e_irq_set_cause_exit Set IRQ cause 0x90, ICR: 0x90
e1000e_send_msi: causes 0x80, msi_causes_pending 0
e1000e_send_msi: going to send MSI
e1000e_irq_postponed_by_xitr Interrupt postponed by [E]ITR register 0xc4
e1000e_send_msi: decided to postpone
--new cause 0x90 saved in core->msi_causes_pending, msi postponed due to timer
--this is the error: it should not have saved the cause into core->msi_causes_pending
  if the IRQ was not actually queued due to a timer.

--4 more packet received
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000090
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80000090
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000090
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80000090
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000090
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80000090
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
e1000e_rx_receive_iov Received vector of 1 fragments
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000090
e1000e_irq_set_cause_exit Set IRQ cause 0x80, ICR: 0x80000090
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
--msis not sent due to timer

--throttling timer fires
e1000e_intrmgr_on_throttling_timer fired
e1000e_irq_msi_notify_postponed Sending MSI postponed by ITR
e1000e_irq_set_cause_entry Going to set IRQ cause 0x0, ICR: 0x80000090
e1000e_irq_set_cause_exit Set IRQ cause 0x0, ICR: 0x80000090
e1000e_send_msi: causes 0x80, msi_causes_pending 0x80
e1000e_send_msi: not going to send msi
--bad state here:
    core->msi_causes_pending already had 0x80 in it from many packets before,
    so it decides not to queue a new packet.
    Timer has now expired and the entire system deadlocks until a new kind of
    irq pending cause queues (such as a tx packet).