I added a nomination for Xenial, but that may not be the right way (I'm not sure how to add a Xenial task like the Bionic task already added.
But this is a regression in as much as on Xenial this does not occur on the 4.4 kernel but shows up at least in the 4.15 HWE kernel. For Bionic it seems to exist in both 4.15 and 4.18 (in cosmic). So any fix that is pulled into 4.18 will need to be pulled into 4.15 for both Bionic and Xenial. Thanks! -- 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/1798127 Title: CPU Soft Lockups when stress-ng stack stressor runs with M.2 NVMe as root FS Status in linux package in Ubuntu: Confirmed Status in linux source package in Bionic: Triaged Bug description: This was reported by a hardware partner. The system set up is a server with 512GB RAM and an M.2 NVMe drive as the root filesystem/boot device. Per the customer, when running the certification Memory Stress test (utilizing several stress-ng stressors run in sequence) the system freezes with CPU Soft Lockup errors appearing on console whe the "stack" stressor is run. Tester has tried with 2.5” SATA (1TB), 2.5” NVMe (800GB), and M.2 NVMe (1.9TB). So far, this only seems to affect the 4.15 kernel. The tester has tried using the 2.5" SATA SSD as the RootFS/Boot device and the tests pass on all attempts. It is ONLY when using the M.2 NVMe as the root / boot device that the tests cause a lockup. The tester is re-trying now with the 2.5" NVMe device to see if this only occurs with the M.2 NVMe. The tester has tried this on the following while using the M.2 NVMe as the rootFS/Boot device: Test run #1 – 16.04.5 at kernel 4.15; Result: Failed stress-ng memory on stack stressor Test run #2 – 18.04.1 at kernel 4.15; Result: Failed stress-ng memory on stack stressor Test run #3 – 16.04.5 at kernel 4.4; Result: Passed stress-ng memory test The stress-ng command invoked at the time the soft lockups occur is this: 'stress-ng -k --aggressive --verify --timeout 300 --stack 0' This can be reproduced by running the memory_stress_ng test script from the cert suite: sudo /usr/lib/plainbox-provider-certification- server/bin/memory_stress_ng It may be more easily reproducible running the stack stressor alone, or the whole memory stress script without dealing with Checkbox. UPDATE: The tester also confirms that the 2.5" NVMe drives also fail with the 4.15 kernel and pass with the 4.4 kernel. The SSD works on all kernels. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1798127/+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
