** Description changed: + [Impact] + While running the memory stress test, the system becomes unresponsive. + + [Fix] + The commit from linux-next fixes the issue + 4a077b6dd4a4 mm: page_alloc: avoid kswapd thrashing due to NUMA restrictions + + [Test] + Run the following command on the machine with kernel version greater or equal to v6.11 + sudo stress-ng --aggressive --verify --timeout 300 --mmapmany 0 + It should finish the test in 5mins. + + [Where problems could occur] + Given that the patch was reviewed and tested by multiple experienced kernel developers, the likelihood of it causing a noticeable regression is very low. It is far more likely to improve performance and stability on NUMA systems under the conditions described in the commit message. + + ========================= For OEM-6.11 ============================ [Impact] While running the memory stress test, the system becomes unresponsive. [Fix] The commit in v6.11-rc1 introduce the issue. 4e63aeb5d010 blk-wbt: don't throttle swap writes in direct reclaim And we are seeking for help from the patch owner and other developers on the mailing list https://lkml.org/lkml/2025/3/20/90 Currently, we have to revert this commit, because this issue happens on many platforms. [Test] Run the following command on the machine with kernel version greater or equal to v6.11 sudo stress-ng --aggressive --verify --timeout 300 --mmapmany 0 It should finish the test in 5mins. [Where problems could occur] From the commit message reverts this commit may trigger a hang "When a process holds a lock to allocate a free page, and enters direct reclaim because there is no free memory, then it might trigger a hung due to the wbt throttling that causes other processes to fail to get the lock."
** Tags added: jira-somerville-1934 somerville -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2103680 Title: System hangs when running the memory stress test To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2103680/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
