Messages in this thread | | | Date | Tue, 8 Feb 2022 08:32:37 +0100 | From | Paul Menzel <> | Subject | ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT |
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Dear Linux folks,
On the POWER8 server IBM S822LC running Ubuntu 21.10, Linux 5.17-rc1+ built with
$ grep HZ /boot/config-5.17.0-rc1+ CONFIG_NO_HZ_COMMON=y # CONFIG_HZ_PERIODIC is not set CONFIG_NO_HZ_IDLE=y # CONFIG_NO_HZ_FULL is not set CONFIG_NO_HZ=y # CONFIG_HZ_100 is not set CONFIG_HZ_250=y # CONFIG_HZ_300 is not set # CONFIG_HZ_1000 is not set CONFIG_HZ=250
once warned about a NOHZ tick-stop error, when I executed `sudo /usr/sbin/ppc64_cpu --smt=off` (so that KVM would work).
``` $ dmesg [ 0.000000] Linux version 5.17.0-rc1+ (pmenzel@flughafenberlinbrandenburgwillybrandt.molgen.mpg.de) (Ubuntu clang version 13.0.0-2, LLD 13.0.0) #1 SMP Fri Jan 28 17:13:04 CET 2022 […] [271272.030262] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271272.305726] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271272.549790] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271274.885167] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271275.113896] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271275.412902] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271275.625245] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271275.833107] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271276.041391] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! [271277.244880] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!! ```
Kind regards,
Paul
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