https://bugzilla.kernel.org/show_bug.cgi?id=217242 --- Comment #18 from Austin Domino (austin.domino@xxxxxxxxxxx) --- I've narrowed down when this bug first appears to the 5.12 kernel release; I ran a couple computers for a week on kernel version 5.11 and ran into 0 problems while running a program like the one above, but before doing this, I had 1 of those computers on kernel version 5.12 while running that same program with the same devices and it ran into this bug within 24 hours. I looked at the number of TRBs for the computers that ran kernel version 5.11 for over a week with that program, and they were all at 512, so it's extremely unlikely that the ring expansion problems are present in version 5.11. This morning, out of curiosity, I took a computer running Ubuntu 18.04, went to Ubuntu's kernel build page, https://kernel.ubuntu.com/~kernel-ppa/mainline/, and tried a number of kernels to narrow down when the ring expansion problems first appeared. It seems that this problem is present in all the 5.12-rc releases, and I know that it's present on 5.15; that was what this computer was running before all of this, so I'm assuming that it's present from 5.12 onward. Right now I have this computer running kernel "v5.12-rc1" from Ubuntu's kernel page, the ring expansion problems are present; the maximum number of TRBs for a device the last time I checked was 8388608 after ~2.5 hours, and I'm curious if this computer will run into a hard lockup. I'm nearly certain that it will, but we'll just have to wait and see to be certain. Lastly, I went and looked at the changes that were done between v5.11 and v5.12-rc2 within the "drivers/usb/host" directory and it appears that a moderate amount of change took place (more than enough to make my head spin). I haven't dealt with kernel source like this before and it'd take a while to parse through everything to understand what's going on, so I don't know how much further I will get involved. Anyhow, I hope that this information might help. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
