linux-kernel - Re: [PATCH v2 2/7] MIPS: csrc-r4k: Apply verification clocksource flags

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Message-ID: <900ae60e-84f8-4300-87e7-7f35d16ad439@roeck-us.net>
Date: Tue, 6 Aug 2024 08:06:49 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Serge Semin <fancer.lancer@...il.com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>, "Maciej W. Rozycki"
 <macro@...am.me.uk>, "linux-mips@...r.kernel.org"
 <linux-mips@...r.kernel.org>, linux-kernel@...r.kernel.org,
 regressions@...ts.linux.dev
Subject: Re: [PATCH v2 2/7] MIPS: csrc-r4k: Apply verification clocksource
 flags

On 8/5/24 22:13, Guenter Roeck wrote:
> On 8/5/24 22:06, Jiaxun Yang wrote:
>>
>>
>> 在2024年8月6日八月 下午12:09，Guenter Roeck写道：
>>> Hi,
>>>
>>> On Wed, Jun 12, 2024 at 09:54:29AM +0100, Jiaxun Yang wrote:
>>>> CP0 counter suffers from various problems like SMP sync,
>>>> behaviour on wait.
>>>>
>>>> Set CLOCK_SOURCE_MUST_VERIFY and CLOCK_SOURCE_VERIFY_PERCPU,
>>>> as what x86 did to TSC, to let kernel test it before use.
>>>>
>>>> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
>>
>> Hi Guenter,
>>
>> Thanks for the report, it makes no sense to me though....
>>
>> I can't reproduce it with QEMU git master, do you mind specifying your QEMU
>> version for me? Also is it possible to have a copy of dmesg when failure happens.
>>
> 
> I currently use v9.0.2. I'll try with some other versions tomorrow.
> A complete log is at
> https://kerneltests.org/builders/qemu-mips64-master/builds/241/steps/qemubuildcommand/logs/stdio
> 
> Are you trying to instantiate an e1000 (or a variant of it) ? So far
> I have only seen the problem with that controller. There is no specific
> error message, the network interface just doesn't get an IP address.
> 

I am able to reproduce the problem with qemu 6.2.0 (Debian build).
http://server.roeck-us.net/qemu/mips64/ should have everything needed to
reproduce it. "repeat.sh" repeats the test until it fails.

Hope this helps,
Guenter