Messages in this thread | | | Date | Fri, 30 Sep 2022 09:11:29 -0700 | From | "Paul E. McKenney" <> | Subject | Re: INFO: task rcu_gp:3 blocked for more than 122 seconds. |
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On Fri, Sep 30, 2022 at 12:19:34PM +0200, Borislav Petkov wrote: > 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. > ^^^^^^^^^^^^^^
That can be annoying! I well recall one bisection session where each step took several hours, and where each step required manual intervention, and where the bug was urgent. I got the bisection overnight, but was pretty useless then next day. ;-)
> But it looks like sched/core is the culprit because merging it into > Linus master triggers it.
It is possible that Peter would want proof of this. ;-)
> Lemme bisect that.
Please, and thank you in advance!
Thanx, Paul
> Stay tuned. > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette
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