Messages in this thread | | | Date | Thu, 13 Apr 2023 09:21:10 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [BUG?] INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-.... } 3 jiffies s: 309 root: 0x1/. |
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On Thu, Apr 13, 2023 at 04:32:32PM +0100, Rui Salvaterra wrote: > Hi, Paul, > > On Thu, 13 Apr 2023 at 15:43, Paul E. McKenney <paulmck@kernel.org> wrote: > > > > My guess would be that you have CONFIG_RCU_EXP_CPU_STALL_TIMEOUT set to > > some small non-zero number, for example, you might have set up a recent > > Android .config or some such. The default of zero would give you about > > 21 seconds rather than the three jiffies that you are seeing. > > > > Could you please check your .config? > > Well, this is embarrassing. I can't fathom why/how, but I had it set > to 20, on this machine. That is, 20 millisseconds. I guess its a > miracle I haven't seen *more* expedited RCU traces. Sorry for the > noise, everyone.
Been there, done that!
And actually, it is kind of reassuring that the Linux kernel avoids tens-of-milliseocnds latency blows in the common case on your system.
Thanx, Paul
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