Re: 6.8-rc: system freezes after resuming from suspend

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On 2/17/24 09:13, Linux regression tracking (Thorsten Leemhuis) wrote:
> [/me among others adds Shyam (author of the culprit) and Hans (committed
> it) to the list of recipients]
> For the newly joined, this thread starts here:

Thanks (1)

Trolli, there are 2 PMF fixes pending for 6.8, one of which is
suspend-resume related:

I plan to merge these and send them in their way to Linus next week.

Can you build a 6.8-c4 with those 2 included and see if that fixes things ?

You can download mbox files from patchwork and then do "git am <file>"
to apply them.



1) Note I'm subscribed to the regressions list so I was already following this.

> On 17.02.24 00:26, Trolli Schmittlauch wrote:
>>>> Still, I had the time to bisect the vanilla kernel and landed at 
>>>> 7c45534afa4435c9fceeeb8ca33c0fdc269c2240 as the first bad commit.
> Reminder, that's 7c45534afa4435 ("platform/x86/amd/pmf: Add support for
> PMF Policy Binary") [v6.8-rc1]
>>>>  Could be a red herring though[]
>>> If this turns out to be accurate, it's actually quite interesting.
>>> You can prove it's accurate by doing a module blacklist for the
>>> amd-pmf driver (even on 6.8-rc4+).
>>> If that works, it's a great hint at the problem scope and we need to
>>> pull Shyam into the conversation.
>> I just checked this with Linux version 6.8.0-rc4 (nixbld@localhost) (gcc
>> (GCC) 12.3.0, GNU ld (GNU Binutils) 2.40) #1-NixOS SMP PREEMPT_DYNAMIC
>> Sun Feb 11 20:18:13 UTC 2024.
>> Blacklisting the "amd-pmf" module indeed resolves the issue, good catch.
>> I've attached to s2idle logs of 4 successful cycles without amd-pmf. To
>> be honest, I don't know why the script considers the kernel to be
>> tainted. I have compiled the kernel via the NixOS packaging
>> infrastracture though without checking whether the distro applies any
>> patches, but a guix user had also confirmed the issue in the Framework
>> forum so I guess this issue is vanilla enough.
>> Looking forward to resolving this. I guess for most use cases I can just
>> keep the module blacklisted for now?
> Ciao, Thorsten
> P.S.: To be sure the issue doesn't fall through the cracks unnoticed,
> I'm adding it to regzbot, the Linux kernel regression tracking bot:
> #regzbot introduced 7c45534afa4435 /
> #regzbot title platform/x86/amd/pmf: system freezes after resuming from
> suspend
> #regzbot ignore-activity

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