Re: [LAU] Disabling IRQ #19

On 06/17/2014 08:06 PM, Peter P. wrote:
> Dear List,
>
> I have a strange and unreproducable error on my laptop, that halts the
> entire audio system randomly about once every three weeks.
>
> Jackd quits, with it all clients, and dmesg says:
>
> [21684.947293] irq 19: nobody cared (try booting with the "irqpoll"option)
> [21684.947303] Pid: 194, comm: irq/19-ehci_hcd Not tainted 3.2.0-4-rt-amd64 #1 Debian 3.2.54-2
> [21684.947309] Call Trace:
> [21684.947327] [<ffffffff81098889>] ? __report_bad_irq+0x2c/0xb5
> [21684.947336] [<ffffffff81098c6d>] ? note_interrupt+0x16f/0x1f2
> [21684.947344] [<ffffffff81097969>] ? irq_thread_fn+0x32/0x32
> [21684.947351] [<ffffffff81097969>] ? irq_thread_fn+0x32/0x32
> [21684.947358] [<ffffffff8109783c>] ? irq_thread+0x106/0x201
> [21684.947367] [<ffffffff81097736>] ? irq_finalize_oneshot+0xb3/0xb3
> [21684.947378] [<ffffffff81062ee4>] ? kthread+0x78/0x80
> [21684.947385] [<ffffffff8103f2fa>] ? get_parent_ip+0x9/0x1b
> [21684.947395] [<ffffffff8136a0f4>] ? kernel_thread_helper+0x4/0x10
> [21684.947405] [<ffffffff81062e6c>] ? rcu_read_unlock_sched_notrace+0x2a/0x2a
> [21684.947412] [<ffffffff8136a0f0>] ? gs_change+0x13/0x13
> [21684.947417] handlers:
> [21684.947429] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa003d483>] usb_hcd_irq
> [21684.947473] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa025a85a>] ips_irq_handler
> [21684.947485] [<ffffffff81096e34>] irq_default_primary_handler threaded [<ffffffffa04d62cd>] snd_hdsp_interrupt
> [21684.947498] Disabling IRQ #19
>
> The sound card is an RME Multiface via an ExpressCard in a Thinkpad
> X201s. The card itself had been working reliably since more than ten
> years by now (not with the ExpressCard though). Running on Debian RT
> Kernel.
>
> I have no way to set/change the IRQ assignments in this BIOS.
> Interrupt 19 is shared by modules ehci_hcd:usb2, ips, snd_hdsp,
> where the two others are USB and the thermal subsystem.
> I assume ehci_hcd:usb2 denotes the second USB bus. If this is correct,
> there are no devices connected to it at the moment, according to lsusb
> (except for USB hubs).
>
> Web research has shown that people suggest using the kernel option
> "irqpoll" or disable "threadirqs", use "noirqdebug" or "irqdebug" options
> (apparently quite expensive in computation), or the irqbalance
> package.
>
> https://bbs.archlinux.org/viewtopic.php?id=133327 gives a hint about
> deinstalling laptop-mode-tools, which I am running, and which made the
> problem go away for the poster.
>
> As the error occurs so infrequently, I can not yet verify if any of
> these help, and am hoping for some hints or experience from this list.
>
> Please, any help or ideas are desperately needed, as this is a
> production system that is used in live shows in front of large
> audiences, and I absolutely need to resolve that error.
>
> Thank you for all ideas,
> best, Peter
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>

You are not alone with this issue,
I tried to work around this on different hardware by turning off the
devices that share the IRQ in BIOS. I suppose that's not a good idea or
even impossible with the thermal subsystem, but it _seems_ to work on my
system. In my case there was (probably) a USB device causing problems,
but due to the dodgy nature of the problem, I could not reproduce it or
verify a working solution.
As a note, I was also using Kernel 3.2. maybe more recent Kernel
versions don't have this issue?

Can you trigger the Problem somehow? Maybe by connecting and
disconnecting USB devices?
If you try to reproduce this, please take notes on what you are doing
and how.

Greetings
Markus
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-user
Received on Wed Jun 18 00:15:02 2014