linux-kernel - Re: INFO: task systemd-udevd:94 blocked for more than 120 seconds.

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Message-ID: <Yy4MNp6yiRTJxeXa@zn.tnic>
Date:   Fri, 23 Sep 2022 21:42:46 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: INFO: task systemd-udevd:94 blocked for more than 120 seconds.

On Fri, Sep 23, 2022 at 12:18:56PM -0700, Nathan Chancellor wrote:
> I have not seen a stacktrace like this on my machines (although I
> suspect that is because I don't have CONFIG_DETECT_HUNG_TASK enabled in
> my configs) but my Honeycomb LX2 hangs while booting after commit
> 78ffa3e58d93 ("thermal/core: Add a generic thermal_zone_get_trip()
> function") according to my bisect, which certainly seems like it could
> be related to the trace you are seeing.

Don't you just love how well our community works - one reports a bug and
someone else has already bisected it and thus saves one the work?!

:-)))

Thanks Nathan, I can confirm your bisection. The commit above doesn't
revert cleanly ontop of linux-next so I tried it and the patch before
it:

78ffa3e58d93 ("thermal/core: Add a generic thermal_zone_get_trip() function")	<- BAD
62022c15f627 ("Merge branch 'pm-opp' into linux-next")				<- GOOD

so it looks like that one is somehow b0rked.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette