This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1813847 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1813847 Title: af-alg stressor triggers modprobe throttling Status in Stress-ng: In Progress Status in linux package in Ubuntu: Incomplete Bug description: Due to the combination of high core counts and perhaps a lack of available hash/crypto hardware acceleration drivers, arm64 server platforms generate a lot of noisy modprobe throttling messages when running the af-alg stressor. This appears to be partially mitigated in master by disabling hashes/ciphers once they are found to be not present. But, w/ 96 cores/hogs, we presumably still hit the kernel with 96 * (nr_hashes + nr_ciphers) before that mitigation takes effect, and that is sufficient to cause the kernel to emit throttling messages. $ sudo dmesg -c > /dev/null ; ./stress-ng --af-alg 0 --af-alg-ops=200000; sudo dmesg -c stress-ng: info: [76141] defaulting to a 86400 second (1 day, 0.00 secs) run per stressor stress-ng: info: [76141] dispatching hogs: 96 af-alg stress-ng: info: [76141] successful run completed in 0.40s [ 5808.489046] __request_module: 25 callbacks suppressed [ 5808.489050] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.489503] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.489724] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.489731] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.490092] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-xor-all, throttling... [ 5808.490235] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash-all, throttling... [ 5808.490308] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.490367] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... [ 5808.490597] request_module: kmod_concurrent_max (0) close to 0 (max_modprobes: 50), for module crypto-ghash, throttling... To manage notifications about this bug go to: https://bugs.launchpad.net/stress-ng/+bug/1813847/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp