linux-kernel - Re: Linux 4.9.6 ( Restore IO-APIC irq_chip retrigger callback , breaks my box )

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Date:   Mon, 6 Feb 2017 21:38:22 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     "Ruslan Ruslichenko -X (rruslich - GLOBALLOGIC INC at Cisco)" 
        <rruslich@...co.com>, Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        torvalds@...ux-foundation.org, stable@...r.kernel.org, lwn@....net,
        Jiri Slaby <jslaby@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Linux 4.9.6 ( Restore IO-APIC irq_chip retrigger callback ,
 breaks my box )



On 06.02.2017 20:05, Ruslan Ruslichenko -X (rruslich - GLOBALLOGIC INC at Cisco) wrote:
> On 02/06/2017 07:41 PM, Greg KH wrote:
>> On Mon, Feb 06, 2017 at 06:30:15PM +0100, Gabriel C wrote:
>>> On 26.01.2017 08:48, Greg KH wrote:
>>>
>>> Hi Greg,
>>>
>>>> I'm announcing the release of the 4.9.6 kernel.
>>>
>>> Somewhat late , however I didn't tested 4.9.6 but jumped from 4.9.5 to 4.9.7
>>> and found out by box won't boot anymore.
>>>
>>> It hangs early and freeze with a lot RCU warnings.
>>> Since I cannot setup a netconsole right now I cannot post the errors , really sorry.
>>>
>>> ( but I could make a picture if needed )
>>>
>>>
>>> I bisected it down to :
>>>
>>>> Ruslan Ruslichenko (1):
>>>>        x86/ioapic: Restore IO-APIC irq_chip retrigger callback
>>> Reverting this one fixes the problem for me..
>>>
>>> Also this problem exists in Linus tree , I tested on:
>>> 4.10.0-rc6-00167-ga0a28644c1cf
>> Ok, at least we are consistent :)
>>
>>> The box is a PRIMERGY TX200 S5 , 2 socket , 2 x E5520 CPU(s) installed.
>>>
>>> Config:
>>> https://raw.githubusercontent.com/frugalware/frugalware-current/master/source/base/kernel/config.x86_64
>> Ruslan, any thoughts about what to do here?
> This looks strange. What this patch does is just revert previous
> behavior, broken by d32932d02e18.
> So we can try to test with last v4.1 stable, where retrigger callback
> were still present.

I can test that but first on weekend if you wish.

> Also on v4.10 maybe check with software emulation of this feature and
> reverted patch, e.g.:
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index e487493..49c3c71 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -170,6 +170,7 @@ config X86
>          select USER_STACKTRACE_SUPPORT
>          select VIRT_TO_BUS
>          select X86_FEATURE_NAMES                if PROC_FS
> +       select HARDIRQS_SW_RESEND
>
>   config INSTRUCTION_DECODER
>          def_bool y
>

With patch reverted + this one I get a early kernel panic.. on 4.10.0-rc7

With just the patch reverted all is fine , the box boots and all seems fine.

> I think for further debugging logs will be needed.

Yes sure , I just need to find a way to set something up like netconsole here.
Right now I have no way doig that. I'll try to do that on weekend too also.

Regards,

Gabriel C