Please install and boot kernel [1] which enables IRQ debugfs. Then you can find the "do_IRQ: X.Y" means. On my system:
# ls /sys/kernel/debug/irq/irqs 0 1 10 11 12 120 121 122 123 124 125 126 127 128 129 13 130 131 132 133 14 15 16 17 18 19 2 3 4 5 51 6 67 7 8 9 # cat /sys/kernel/debug/irq/irqs/129 handler: handle_edge_irq device: 0000:01:00.0 status: 0x00004000 istate: 0x00000000 ddepth: 0 wdepth: 0 dstate: 0x01409200 IRQD_ACTIVATED IRQD_IRQ_STARTED IRQD_SINGLE_TARGET IRQD_MOVE_PCNTXT IRQD_AFFINITY_SET node: -1 affinity: 4 effectiv: 4 pending: domain: INTEL-IR-MSI-1-3 hwirq: 0x80000 chip: IR-PCI-MSI flags: 0x30 IRQCHIP_SKIP_SET_WAKE IRQCHIP_ONESHOT_SAFE parent: domain: INTEL-IR-1 hwirq: 0x1c0000 chip: INTEL-IR flags: 0x0 parent: domain: VECTOR hwirq: 0x81 chip: APIC flags: 0x0 Vector: 34 Target: 4 move_in_progress: 0 is_managed: 0 can_reserve: 0 has_reserved: 0 cleanup_pending: 0 Target and Vector are the values in "do_IRQ: Target.Vector". The affected device can be found by finding the matched Target and Vector. [1] https://people.canonical.com/~khfeng/lp1781016-irq-debug/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781016 Title: Slow flood of do_IRQ: No irq for vector To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781016/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs