On an Asus E45M1-M PRO (AMD E-450) board with 64-bit Linux 3.0.0
(Ubuntu) and 3.2.0, I regularly get (more detailed logs at the end):


Nov 28 04:35:29 zacate kernel: [29581.259926] irq 16: nobody cared
(try booting with the "irqpoll" option)
Nov 28 04:35:29 zacate kernel: [29581.259945] Pid: 0, comm: swapper
Tainted: P            3.0.0-13-generic #22-Ubuntu
...
Nov 28 04:35:29 zacate kernel: [29581.260171] handlers:
Nov 28 04:35:29 zacate kernel: [29581.260204] [<ffffffffa0085ee0>] irq_handler
Nov 28 04:35:29 zacate kernel: [29581.260216] [<ffffffffa048efe0>] azx_interrupt
Nov 28 04:35:29 zacate kernel: [29581.260223] Disabling IRQ #16


Nov 24 21:25:41 zacate kernel: [  190.503838] irq 19: nobody cared
(try booting with the "irqpoll" option)
Nov 24 21:25:41 zacate kernel: [  190.503856] Pid: 0, comm: swapper
Tainted: P            3.0.0-13-generic #22-Ubuntu
...
Nov 24 21:25:41 zacate kernel: [  190.504052] handlers:
Nov 24 21:25:41 zacate kernel: [  190.504085] [<ffffffffa0001f40>]
ahci_interrupt
Nov 24 21:25:41 zacate kernel: [  190.504101] [<ffffffffa004e6c0>] e1000_intr
Nov 24 21:25:41 zacate kernel: [  190.504108] Disabling IRQ #19


I also tried with an untainted 3.2.0-rc2 kernel, in which I also
disabled threadirqs:


Nov 24 20:50:41 zacate kernel: [   57.366678] irq 19: nobody cared
(try booting with the "irqpoll" option)
Nov 24 20:50:41 zacate kernel: [   57.366690] Pid: 0, comm: swapper
Not tainted 3.2.0-rc2 #5


The affected IRQ lines in /proc/interrupts:

 16:        333        771   IO-APIC-fasteoi   firewire_ohci, hda_intel
...
 19:      39128      15165   IO-APIC-fasteoi   ahci, eth1
 40:      25641         59   PCI-MSI-edge      eth0
 41:          0          0   PCI-MSI-edge      xhci_hcd
 42:          0          0   PCI-MSI-edge      xhci_hcd
 43:          0          0   PCI-MSI-edge      xhci_hcd
 44:          2        404   PCI-MSI-edge      hda_intel
 45:          0          3   PCI-MSI-edge      fglrx[0]@PCI:0:1:0


The dmesg lines directly pertaining to IRQ 16 and IRQ 19

[    0.328032] pci 0000:00:15.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    0.328056] pci 0000:00:15.1: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    0.328077] pci 0000:00:15.2: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    0.328127] pci 0000:00:15.3: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[    2.671164] firewire_ohci 0000:05:02.0: PCI INT A -> GSI 16 (level,
low) -> IRQ 16
[    5.074619] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level,
low) -> IRQ 16

[    2.010643] ahci 0000:00:11.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[    2.073026] xhci_hcd 0000:06:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[    2.090881] xhci_hcd 0000:06:00.0: irq 19, io mem 0xfe900000
[    2.091040] xhci_hcd 0000:06:00.0: irq 41 for MSI/MSI-X
[    2.091050] xhci_hcd 0000:06:00.0: irq 42 for MSI/MSI-X
[    2.091059] xhci_hcd 0000:06:00.0: irq 43 for MSI/MSI-X
[    2.115098] e1000 0000:05:01.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[    5.041614] HDA Intel 0000:00:01.1: PCI INT B -> GSI 19 (level,
low) -> IRQ 19
[    5.041711] HDA Intel 0000:00:01.1: irq 44 for MSI/MSI-X


What I noted:

- The problem (IRQ lines 16 and 19 getting disabled) occurs fairly
often, but losing 19 occurs much more frequently than 16.
- The problem with IRQ19 goes away (at least sufficiently long not to
be occurring within 24h) when module e1000 is unloaded.
- The problem persists with and without forced IRQ threading.
- The problem persists with pci=nocsr.
- The problem persists with irqfixup.
- When IRQ19 dies, disk I/O access becomes very slow and unreliable.


What could be going wrong here ? I note that at least 3 devices
(00:15.x, 05:02.0 and 00:14.2) have their IRQ lines routed to IRQ 16,
but I see only 2 handlers in the dmesg log and /proc/interrupts. The
same applies to IRQ 19 (4 devices: 00:11.0, 06:00.0, 05:01.0 and
00:01.0). It is true that some of these ultimately seem to switch to
MSI (06:00.0 and 00:01.0), but so does the video card (00:01.0), which
does not route to any IRQ beforehand.

Before I try finding the problem, I would like to know what a
plausible failure mechanism is, so if anyone could give a hint on
where to start looking...

Thanks for your opinion (and please also CC to my PM address - not
(yet) subscribed to the LKML),


J.


More detailed logs:

Nov 28 04:35:29 zacate kernel: [29581.259926] irq 16: nobody cared
(try booting with the "irqpoll" option)
Nov 28 04:35:29 zacate kernel: [29581.259945] Pid: 0, comm: swapper
Tainted: P            3.0.0-13-generic #22-Ubuntu
Nov 28 04:35:29 zacate kernel: [29581.259952] Call Trace:
Nov 28 04:35:29 zacate kernel: [29581.259958]  <IRQ>
[<ffffffff810cf96d>] __report_bad_irq+0x3d/0xe0
Nov 28 04:35:29 zacate kernel: [29581.259986]  [<ffffffff810cfd95>]
note_interrupt+0x135/0x180
Nov 28 04:35:29 zacate kernel: [29581.259998]  [<ffffffff810cdd89>]
handle_irq_event_percpu+0xa9/0x220
Nov 28 04:35:29 zacate kernel: [29581.260008]  [<ffffffff810cdf4e>]
handle_irq_event+0x4e/0x80
Nov 28 04:35:29 zacate kernel: [29581.260019]  [<ffffffff810d06c4>]
handle_fasteoi_irq+0x64/0xf0
Nov 28 04:35:29 zacate kernel: [29581.260029]  [<ffffffff8100c252>]
handle_irq+0x22/0x40
Nov 28 04:35:29 zacate kernel: [29581.260040]  [<ffffffff815f422a>]
do_IRQ+0x5a/0xe0
Nov 28 04:35:29 zacate kernel: [29581.260050]  [<ffffffff815ea913>]
common_interrupt+0x13/0x13
Nov 28 04:35:29 zacate kernel: [29581.260056]  <EOI>
[<ffffffff813725fb>] ? arch_local_irq_enable+0x8/0xd
Nov 28 04:35:29 zacate kernel: [29581.260079]  [<ffffffff810887a5>] ?
sched_clock_idle_wakeup_event+0x15/0x20
Nov 28 04:35:29 zacate kernel: [29581.260089]  [<ffffffff813730ed>]
acpi_idle_enter_simple+0xcc/0x102
Nov 28 04:35:29 zacate kernel: [29581.260100]  [<ffffffff814ab5c2>]
cpuidle_idle_call+0xa2/0x1d0
Nov 28 04:35:29 zacate kernel: [29581.260112]  [<ffffffff8100920b>]
cpu_idle+0xab/0x100
Nov 28 04:35:29 zacate kernel: [29581.260124]  [<ffffffff815b858e>]
rest_init+0x72/0x74
Nov 28 04:35:29 zacate kernel: [29581.260134]  [<ffffffff81ad0c2b>]
start_kernel+0x3d4/0x3df
Nov 28 04:35:29 zacate kernel: [29581.260144]  [<ffffffff81ad0388>]
x86_64_start_reservations+0x132/0x136
Nov 28 04:35:29 zacate kernel: [29581.260156]  [<ffffffff81ad0140>] ?
early_idt_handlers+0x140/0x140
Nov 28 04:35:29 zacate kernel: [29581.260165]  [<ffffffff81ad0459>]
x86_64_start_kernel+0xcd/0xdc
Nov 28 04:35:29 zacate kernel: [29581.260171] handlers:
Nov 28 04:35:29 zacate kernel: [29581.260204] [<ffffffffa0085ee0>] irq_handler
Nov 28 04:35:29 zacate kernel: [29581.260216] [<ffffffffa048efe0>] azx_interrupt
Nov 28 04:35:29 zacate kernel: [29581.260223] Disabling IRQ #16


Nov 24 21:25:41 zacate kernel: [  190.503838] irq 19: nobody cared
(try booting with the "irqpoll" option)
Nov 24 21:25:41 zacate kernel: [  190.503856] Pid: 0, comm: swapper
Tainted: P            3.0.0-13-generic #22-Ubuntu
Nov 24 21:25:41 zacate kernel: [  190.503864] Call Trace:
Nov 24 21:25:41 zacate kernel: [  190.503870]  <IRQ>
[<ffffffff810cf96d>] __report_bad_irq+0x3d/0xe0
Nov 24 21:25:41 zacate kernel: [  190.503898]  [<ffffffff810cfd95>]
note_interrupt+0x135/0x180
Nov 24 21:25:41 zacate kernel: [  190.503909]  [<ffffffff810cdd89>]
handle_irq_event_percpu+0xa9/0x220
Nov 24 21:25:41 zacate kernel: [  190.503920]  [<ffffffff810cdf4e>]
handle_irq_event+0x4e/0x80
Nov 24 21:25:41 zacate kernel: [  190.503930]  [<ffffffff810d06c4>]
handle_fasteoi_irq+0x64/0xf0
Nov 24 21:25:41 zacate kernel: [  190.503940]  [<ffffffff8100c252>]
handle_irq+0x22/0x40
Nov 24 21:25:41 zacate kernel: [  190.503952]  [<ffffffff815f422a>]
do_IRQ+0x5a/0xe0
Nov 24 21:25:41 zacate kernel: [  190.503961]  [<ffffffff815ea913>]
common_interrupt+0x13/0x13
Nov 24 21:25:41 zacate kernel: [  190.503967]  <EOI>
[<ffffffff81094482>] ? tick_nohz_stop_sched_tick+0x2a2/0x3f0
Nov 24 21:25:41 zacate kernel: [  190.503992]  [<ffffffff810091d5>]
cpu_idle+0x75/0x100
Nov 24 21:25:41 zacate kernel: [  190.504004]  [<ffffffff815b858e>]
rest_init+0x72/0x74
Nov 24 21:25:41 zacate kernel: [  190.504014]  [<ffffffff81ad0c2b>]
start_kernel+0x3d4/0x3df
Nov 24 21:25:41 zacate kernel: [  190.504024]  [<ffffffff81ad0388>]
x86_64_start_reservations+0x132/0x136
Nov 24 21:25:41 zacate kernel: [  190.504036]  [<ffffffff81ad0140>] ?
early_idt_handlers+0x140/0x140
Nov 24 21:25:41 zacate kernel: [  190.504045]  [<ffffffff81ad0459>]
x86_64_start_kernel+0xcd/0xdc
Nov 24 21:25:41 zacate kernel: [  190.504052] handlers:
Nov 24 21:25:41 zacate kernel: [  190.504085] [<ffffffffa0001f40>]
ahci_interrupt
Nov 24 21:25:41 zacate kernel: [  190.504101] [<ffffffffa004e6c0>] e1000_intr
Nov 24 21:25:41 zacate kernel: [  190.504108] Disabling IRQ #19


Nov 24 20:50:41 zacate kernel: [   57.366678] irq 19: nobody cared
(try booting with the "irqpoll" option)
Nov 24 20:50:41 zacate kernel: [   57.366690] Pid: 0, comm: swapper
Not tainted 3.2.0-rc2 #5
Nov 24 20:50:41 zacate kernel: [   57.366694] Call Trace:
Nov 24 20:50:41 zacate kernel: [   57.366697]  <IRQ>
[<ffffffff810bb9cd>] __report_bad_irq+0x3d/0xe0
Nov 24 20:50:41 zacate kernel: [   57.366715]  [<ffffffff810bbe0d>]
note_interrupt+0x14d/0x210
Nov 24 20:50:41 zacate kernel: [   57.366721]  [<ffffffff810b98a4>]
handle_irq_event_percpu+0xc4/0x290
Nov 24 20:50:41 zacate kernel: [   57.366728]  [<ffffffff810b9ab8>]
handle_irq_event+0x48/0x70
Nov 24 20:50:41 zacate kernel: [   57.366733]  [<ffffffff810bc7fa>]
handle_fasteoi_irq+0x5a/0xe0
Nov 24 20:50:41 zacate kernel: [   57.366740]  [<ffffffff81004012>]
handle_irq+0x22/0x40
Nov 24 20:50:41 zacate kernel: [   57.366747]  [<ffffffff81506b6a>]
do_IRQ+0x5a/0xd0
Nov 24 20:50:41 zacate kernel: [   57.366753]  [<ffffffff814fe72b>]
common_interrupt+0x6b/0x6b
Nov 24 20:50:41 zacate kernel: [   57.366756]  <EOI>
[<ffffffff81009906>] ? native_sched_clock+0x26/0x70
Nov 24 20:50:41 zacate kernel: [   57.366773]  [<ffffffffa00cc0d3>] ?
acpi_idle_enter_simple+0xc5/0x102 [processor]
Nov 24 20:50:41 zacate kernel: [   57.366781]  [<ffffffffa00cc0ce>] ?
acpi_idle_enter_simple+0xc0/0x102 [processor]
Nov 24 20:50:41 zacate kernel: [   57.366788]  [<ffffffff814223a8>]
cpuidle_idle_call+0xb8/0x230
Nov 24 20:50:41 zacate kernel: [   57.366795]  [<ffffffff81001215>]
cpu_idle+0xc5/0x130
Nov 24 20:50:41 zacate kernel: [   57.366802]  [<ffffffff814e2360>]
rest_init+0x94/0xa4
Nov 24 20:50:41 zacate kernel: [   57.366809]  [<ffffffff81aafba4>]
start_kernel+0x3a7/0x3b4
Nov 24 20:50:41 zacate kernel: [   57.366815]  [<ffffffff81aaf322>]
x86_64_start_reservations+0x132/0x136
Nov 24 20:50:41 zacate kernel: [   57.366821]  [<ffffffff81aaf416>]
x86_64_start_kernel+0xf0/0xf7
Nov 24 20:50:41 zacate kernel: [   57.366824] handlers:
Nov 24 20:50:41 zacate kernel: [   57.366834] [<ffffffffa0043c10>]
ahci_interrupt
Nov 24 20:50:41 zacate kernel: [   57.366843] [<ffffffffa006f4f0>] e1000_intr
Nov 24 20:50:41 zacate kernel: [   57.366847] Disabling IRQ #19