Thanks Zhanglei. Great. We have identified the problem patch, which is this one:
380cd49e207ba4 ata: ahci: Add Green Sardine vendor ID as board_ahci_mobile But I am not really sure why this patch is causing a problem. The patch only adds one new line as you can see here: https://pastebin.ubuntu.com/p/TDXdRttc4M/plain Looks like it is altering the behaviour of "PCI device ID 1022:7901" which is supposed to be AMD "Green Sardine". From what I found online, "Green Sardine" is an AMD APU (CPU + GPU) but I believe you are using an AMD EPYC server, so I don't understand why you would be affected at all. Looking at the SOS report you provided, I see the device ID for the SATA controller is 1022:7901 even though you are using EPYC. Again, not really sure why. I don't understand why there is a conflict in device IDs like this. I will see if I can find out more information. Do you know if the problem happens with any disk you hotplug, or just this one? -- 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/1971576 Title: SATA device hot plug regression on AMD EPYC (Asus) server Status in linux package in Ubuntu: Confirmed Bug description: SATA disk hot plug can't work on Ubuntu 20.04 ga-kernel of "Linux version 5.4.0-109-generic", but it works on earlier version of " Linux version 5.4.0-42-generic" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971576/+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
