Re: INFO: task systemd-udevd:94 blocked for more than 120 seconds.
From: Daniel Lezcano
Date: Sat Sep 24 2022 - 04:18:49 EST
Hi Hugh,
On 24/09/2022 09:40, Hugh Dickins wrote:
On Fri, 23 Sep 2022, Borislav Petkov wrote:
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.
Yes, Nathan was alert, and saved me too from bisecting failure to boot
linux-next in another thread.
And I see from
https://lore.kernel.org/lkml/c85a77a3-409b-3e83-08a7-ac7e1888790d@xxxxxxxxxxx/
that Marek also found it: and tried to fix it, but found it goes too wide.
I made a patch of the offending series with
git diff 78ffa3e58d93^ 2b109cffe683
and then reverted that cleanly from next-20220923: works for me.
Thanks for investigating. I believe I found from where is coming the
deadlock. I'll send a fix for that.
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