Re: [PATCH v5 6/9] slub: Delay freezing of partial slabs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxx 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.

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [eCos]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux