linux-kernel - Re: INFO: task rcu_gp:3 blocked for more than 122 seconds.

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Message-ID: <YzbCtvNWue+qUnT0@zn.tnic>
Date:   Fri, 30 Sep 2022 12:19:34 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: INFO: task rcu_gp:3 blocked for more than 122 seconds.

On Thu, Sep 29, 2022 at 08:37:22AM -0700, Paul E. McKenney wrote:
> As discussed on IRC, I got nuttin' on this one.  Looks like an RCU
> expedited grace period is stuck waiting for its workqueue kthread, and
> that this workqueue kthread is stuck for some reason.

Yeah, it is not that easy to repro - I need to wait a couple of minutes
after it boots. Look at the timestamps:

[  249.149378] INFO: task rcu_gp:3 blocked for more than 122 seconds.
^^^^^^^^^^^^^^

But it looks like sched/core is the culprit because merging it into
Linus master triggers it.

Lemme bisect that.

Stay tuned.

-- 
Regards/Gruss,
    Boris.

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