I'm also seeing a lot of these msgs on s390x still with kinetic, when server certification runs are done: Oct 31 11:33:57 s1lp10 kernel: [592067.859684] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd320, throttling... Oct 31 11:33:57 s1lp10 kernel: [592067.872844] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592067.883019] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.050389] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.103120] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.104379] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.105161] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.105896] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:57 s1lp10 kernel: [592068.297550] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:33:58 s1lp10 kernel: [592068.305050] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... Oct 31 11:34:13 s1lp10 kernel: [592069.189683] request_module: modprobe crypto-rmd128 cannot be processed, kmod busy with 50 threads for more than 5 seconds now Oct 31 11:34:13 s1lp10 kernel: [592083.809924] __request_module: 266 callbacks suppressed (s390x has a lot of add. crypto modules) Or: stress-ng: info: [2822111] defaulting to a 86400 second (1 day, 0.00 secs) run per stressor stress-ng: info: [2822111] dispatching hogs: 282 af-alg stress-ng: info: [2822112] stress-ng-af-alg: 90 cryptographic algorithms found in /proc/crypto stress-ng: info: [2822112] stress-ng-af-alg: 113 cryptographic algorithms in total (with defconfigs) stress-ng: info: [2822111] successful run completed in 23.38s [594523.200917] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-tgr160, throttling... [758066.621778] __request_module: 483 callbacks suppressed [758066.621782] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-blowfish, throttling... [758066.621801] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-blowfish, throttling... [758066.622950] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-blowfish, throttling... [758066.622970] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-blowfish, throttling... [758066.623279] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758066.750379] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rsa, throttling... [758066.769680] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-sm4, throttling... [758066.769694] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-sm4, throttling... [758066.769706] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-sm4, throttling... [758066.769717] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-sm4, throttling... [758073.883098] __request_module: 208 callbacks suppressed [758073.883104] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883122] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883133] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883411] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883584] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883596] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.883609] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.885190] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.885405] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758073.885546] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-aegis128l, throttling... [758082.651065] __request_module: 2226 callbacks suppressed [758082.651072] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd256, throttling... [758082.651123] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd256, throttling... [758082.652433] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd256, throttling... [758082.655814] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd256, throttling... [758082.657548] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... [758082.658510] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-rmd128, throttling... [758082.659684] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-serpent, throttling... [758082.659703] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-serpent, throttling... [758082.659780] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-des, throttling... The stress-ng version that's used is from kinetic universe (and not the one from the checkbox-dev ppa. $ apt-cache policy stress-ng stress-ng: Installed: 0.14.06-1 Candidate: 0.14.06-1 Version table: *** 0.14.06-1 500 500 http://ports.ubuntu.com/ubuntu-ports kinetic/universe s390x Packages 100 /var/lib/dpkg/status 0.14.06-0~202210311420~ubuntu22.10.1 500 500 https://ppa.launchpadcontent.net/checkbox-dev/ppa/ubuntu kinetic/main s390x Packages I believe that even if the above commit is in (which I guess is not the case yet, since I couldn't find it), whould not be sufficient due to add. set of modules.