Messages in this thread | | | From | Shinichiro Kawasaki <> | Subject | Re: [cpuidle,intel_idle] 32d4fd5751: WARNING:at_kernel/rcu/tree.c:#rcu_eqs_exit | Date | Thu, 23 Jun 2022 11:23:59 +0000 |
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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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