Successfully upgraded to 4.19. Stress-ng memory test passed without lockup issue. New rebuild kernel 4.19 has fixed the issue. Refer to text below: ------- ubuntu@fluent-orca:~$ uname -r 4.19.0-041900rc8-generic
ubuntu@fluent-orca:~$ sudo stress-ng -k --aggressive --verify --timeout 300 --stack 0 stress-ng: info: [3516] dispatching hogs: 112 stack stress-ng: info: [3516] successful run completed in 311.37s (5 mins, 11.37 secs) ubuntu@fluent-orca:~$ -------- -- 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
