Date:   Wed, 20 Sep 2023 07:27:51 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux regression tracking (Thorsten Leemhuis) 
        <regressions@...mhuis.info>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: what to do on no reproducer case? (was Re: Fwd: Uhhuh. NMI received
 for unknown reason 3d/2d/ on CPU xx)

[addressing to Thorsten]

On Sat, Sep 02, 2023 at 07:20:55AM +0700, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
> > seems to be a regression since 6.5 release:
> > the infamous error message from the kernel on this 32c/64t threadripper:
> >> [ 2046.269103] perf: interrupt took too long (3141 > 3138), lowering
> >> kernel.perf_event_max_sample_rate to 63600
> >> [ 2405.049567] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2405.049571] Dazed and confused, but trying to continue
> >> [ 2406.902609] Uhhuh. NMI received for unknown reason 2d on CPU 33.
> >> [ 2406.902612] Dazed and confused, but trying to continue
> >> [ 2423.978918] Uhhuh. NMI received for unknown reason 2d on CPU 33.
> >> [ 2423.978921] Dazed and confused, but trying to continue
> >> [ 2429.995160] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2429.995163] Dazed and confused, but trying to continue
> >> [ 2431.233575] Uhhuh. NMI received for unknown reason 3d on CPU 36.
> >> [ 2431.233578] Dazed and confused, but trying to continue
> >> [ 2442.382252] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2442.382255] Dazed and confused, but trying to continue
> >> [ 2442.725076] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2442.725078] Dazed and confused, but trying to continue
> >> [ 2442.732025] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2442.732027] Dazed and confused, but trying to continue
> >> [ 2443.666671] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2443.666673] Dazed and confused, but trying to continue
> >> [ 2443.756776] Uhhuh. NMI received for unknown reason 3d on CPU 39.
> >> [ 2443.756779] Dazed and confused, but trying to continue
> >> [ 2443.907309] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2443.907311] Dazed and confused, but trying to continue
> >> [ 2444.004281] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2444.004283] Dazed and confused, but trying to continue
> >> [ 2444.207944] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2444.207945] Dazed and confused, but trying to continue
> >> [ 2444.517408] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2444.517410] Dazed and confused, but trying to continue
> >> [ 2444.946941] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2444.946943] Dazed and confused, but trying to continue
> >> [ 2445.573807] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2445.573809] Dazed and confused, but trying to continue
> >> [ 2445.776108] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2445.776110] Dazed and confused, but trying to continue
> >> [ 2445.969029] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2445.969031] Dazed and confused, but trying to continue
> >> [ 2446.977458] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2446.977460] Dazed and confused, but trying to continue
> >> [ 2447.044329] Uhhuh. NMI received for unknown reason 2d on CPU 46.
> >> [ 2447.044331] Dazed and confused, but trying to continue
> >> [ 2447.469269] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2447.469271] Dazed and confused, but trying to continue
> >> [ 2447.866530] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2447.866531] Dazed and confused, but trying to continue
> >> [ 2448.456615] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2448.456617] Dazed and confused, but trying to continue
> >> [ 2448.509614] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2448.509616] Dazed and confused, but trying to continue
> >> [ 2448.758005] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2448.758007] Dazed and confused, but trying to continue
> >> [ 2449.093565] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2449.093567] Dazed and confused, but trying to continue
> >> [ 2449.227344] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2449.227346] Dazed and confused, but trying to continue
> >> [ 2449.770534] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2449.770535] Dazed and confused, but trying to continue
> >> [ 2449.955594] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2449.955596] Dazed and confused, but trying to continue
> >> [ 2450.077872] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2450.077874] Dazed and confused, but trying to continue
> >> [ 2450.190844] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2450.190846] Dazed and confused, but trying to continue
> >> [ 2450.561450] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2450.561452] Dazed and confused, but trying to continue
> >> [ 2450.604498] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2450.604500] Dazed and confused, but trying to continue
> >> [ 2450.814451] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2450.814453] Dazed and confused, but trying to continue
> >> [ 2450.923171] Uhhuh. NMI received for unknown reason 2d on CPU 49.
> >> [ 2450.923173] Dazed and confused, but trying to continue
> >> [ 2451.084612] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2451.084614] Dazed and confused, but trying to continue
> >> [ 2451.793342] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2451.793343] Dazed and confused, but trying to continue
> >> [ 2451.793662] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2451.793664] Dazed and confused, but trying to continue
> >> [ 2451.926819] Uhhuh. NMI received for unknown reason 3d on CPU 48.
> >> [ 2451.926821] Dazed and confused, but trying to continue
> >> [ 2452.502583] Uhhuh. NMI received for unknown reason 3d on CPU 49.
> >> [ 2452.502585] Dazed and confused, but trying to continue
> >> [ 2452.675633] Uhhuh. NMI received for unknown reason 2d on CPU 61.
> >> [ 2452.675636] Dazed and confused, but trying to continue
> >> [ 2452.974655] Uhhuh. NMI received for unknown reason 2d on CPU 48.
> >> [ 2452.974657] Dazed and confused, but trying to continue
> >> [ 7065.904855] elogind-daemon[2461]: New session c2 of user janpieter.
> > 
> > according to dmesg, this happens without any special reason (I didn't even notice)
> > some googling points at a ACPI C state problem on AMD CPUs a few years ago
> > in 5.14 kernels, I didn't see it.
> 
> See Bugzilla for the full thread.
> 
> Anyway, I'm adding this regression to be tracked by regzbot:
> 
> #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cgi?id=217857
> 

Hi Thorsten,

This regression looks stalled: on Bugzilla, the reporter keeps asking to me,
for which I'm not the expert of involved subsystem. And apparently, he still
had not any reproducer yet (is it triggered by random chance?). Should I
mark this as inconclusive?

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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