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SubjectRe: [cpuidle,intel_idle] 32d4fd5751: WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit
Date
On Jun 13, 2022 / 00:00, kernel test robot wrote:
>
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-11):
>
> commit: 32d4fd5751eadbe1823a37eb38df85ec5c8e6207 ("cpuidle,intel_idle: Fix CPUIDLE_FLAG_IRQ_ENABLE")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: kernel-selftests
> version: kernel-selftests-x86_64-cef46213-1_20220609
> with following parameters:
>
> group: resctrl
> ucode: 0x500320a
>
> test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
>
>
> on test machine: 88 threads 2 sockets Intel(R) Xeon(R) Gold 6238M CPU @ 2.10GHz with 128G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@intel.com>
>
>
> [ 29.104402][ T0] WARNING: CPU: 0 PID: 0 at kernel/rcu/tree.c:864 rcu_eqs_exit+0x4b/0xc0
> [ 29.104417][ T0]
> [ 29.104418][ T0] =============================
> [ 29.104419][ T0] WARNING: suspicious RCU usage
> [ 29.104421][ T0] 5.19.0-rc1-00001-g32d4fd5751ea #1 Not tainted
> [ 29.104424][ T0] -----------------------------

FYI, I observe this WARNING on my test servers for fstests, with kernel
v5.19-rc3. It was observed at system boot, and was also observed repeatedly
during fstests run. I reverted the commit 32d4fd5751ea then the WARNING
disappeared. The WARNING was observed on systems with 20 threads CPU, but
not observed on systems with 8 threads CPU.

Looking in the commit, I'm not sure how it is related to the RCU warning.
If any further action on my system would help, please let me know.

--
Shin'ichiro Kawasaki
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