Many thanks, I have given this a try today but unfortunately can't
locate the specific Target & Vector combination. Here's what I saw:
$ uname -r
4.20.0-1-generic
$ dmesg | tail
[ 167.279809] do_IRQ: 1.35 No irq handler for vector
# grep 35 /sys/kernel/debug/irq/irqs/*
/sys/kernel/debug/irq/irqs/125: Vector: 35
/sys/kernel/debug/irq/irqs/126: Vector: 35
# cat /sys/kernel/debug/irq/irqs/125
handler: handle_edge_irq
device: 0000:00:02.0
status: 0x00000000
istate: 0x00000000
ddepth: 0
wdepth: 0
dstate: 0x01401300
IRQD_ACTIVATED
IRQD_IRQ_STARTED
IRQD_SINGLE_TARGET
IRQD_AFFINITY_SET
IRQD_SETAFFINITY_PENDING
node: -1
affinity: 0-3
effectiv: 2
pending: 1
domain: PCI-MSI-3
hwirq: 0x8000
chip: PCI-MSI
flags: 0x30
IRQCHIP_SKIP_SET_WAKE
IRQCHIP_ONESHOT_SAFE
parent:
domain: VECTOR
hwirq: 0x7d
chip: APIC
flags: 0x0
Vector: 35
Target: 2
move_in_progress: 0
is_managed: 0
can_reserve: 0
has_reserved: 0
cleanup_pending: 0
# cat /sys/kernel/debug/irq/irqs/126
handler: handle_edge_irq
device: 0000:00:16.0
status: 0x00000000
istate: 0x00000000
ddepth: 0
wdepth: 0
dstate: 0x01400200
IRQD_ACTIVATED
IRQD_IRQ_STARTED
IRQD_SINGLE_TARGET
node: -1
affinity: 0-3
effectiv: 3
pending:
domain: PCI-MSI-3
hwirq: 0x58000
chip: PCI-MSI
flags: 0x30
IRQCHIP_SKIP_SET_WAKE
IRQCHIP_ONESHOT_SAFE
parent:
domain: VECTOR
hwirq: 0x7e
chip: APIC
flags: 0x0
Vector: 35
Target: 3
move_in_progress: 0
is_managed: 0
can_reserve: 0
has_reserved: 0
cleanup_pending: 0
Some suggestions from friends with experience in this matter run along
the lines of attempting to boot with an ACPI_OSI kernel parameter given
the bugs reported within my dmesg, shall I give that a try?
Alternatively, I am game for any further suggestions! :)
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https://bugs.launchpad.net/bugs/1781016
Title:
Slow flood of do_IRQ: No irq for vector
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