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SubjectRe: [PATCH v5 6/9] slub: Delay freezing of partial slabs
On Tue, Nov 21, 2023 at 08:58:40AM +0800, Chengming Zhou wrote:
> On 2023/11/21 02:49, Mark Brown wrote:
> > On Thu, Nov 02, 2023 at 03:23:27AM +0000, chengming.zhou@linux.dev wrote:

> > When we see problems we see RCU stalls while logging in, for example:

> > [ 46.453323] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> > [ 46.459361] rcu: 3-...0: (1 GPs behind) idle=def4/1/0x40000000 softirq=1304/1304 fqs=951
> > [ 46.467669] rcu: (detected by 0, t=2103 jiffies, g=1161, q=499 ncpus=4)
> > [ 46.474472] Sending NMI from CPU 0 to CPUs 3:

> IIUC, here should print the backtrace of CPU 3, right? It looks like CPU 3 is the cause,
> but we couldn't see what it's doing from the log.

AIUI yes, but it looks like we've just completely lost the CPU - there's
more attempts to talk to it visible in the log:

> > A full log for that run can be seen at:
> >
> > https://validation.linaro.org/scheduler/job/4017095

but none of them appear to cause CPU 3 to respond. Note that 32 bit ARM
is just using a regular IPI rather than something that's actually a NMI
so this isn't hugely out of the ordinary, I'd guess it's stuck with
interrupts masked.
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