Hello all, I've been using the Ceph kernel modules in Ubuntu to load a CephFS filesystem quite successfully for several months. Yesterday, I went through a round of updates on my Ubuntu 18.04 machines, which loaded linux-image-5.0.0-32-generic as the kernel. I'm noticing that while the kernel boots and the CephFS filesystem is mounted successfully, any actual file traffic between client/servers is causing the client to hard lock without any kernel panics seen in the logs. Downgrading to linux-image-5.0.0-31-generic fixes the issue.
I'm planning on trying to figure out how to get a crash kernel running and see if I can generate a log file of some sort, but just wondering if anyone else mounting Ubuntu 18.04 and CephFS via kernel modules could replicate this crashing behavior in their environment. I don't have experience in setting up crash kernels or even in filing Ubuntu kernel bugs, so I thought I'd ask this list to see if someone else can replicate this. My Setup: Ubuntu 18.04.3 LTS amd64 Kernel: linux-image-5.0.0-32-generic (installed through the linux-generic-hwe-18.04 metapackage) Number of machines affected/replicated the lockup issues: >100 (three generations of desktop computers, and multiple virtual machines as well) Also, any suggestions for how to get a log for this are appreciated. Chris Wieringa
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