For the record, 4.15.0-1113-aws works in r5.metal w/ kexec. Booted it 10 times successfully from both 5.4.0-1058-aws and 4.15.0-1113-aws (itself.)
(not that it was expected to make a difference as the issue happens on normal boot, which doesn't have previous kernel.) Right after that, in the same instance, trying a normal boot fails. And it had kdump installed/enabled (ie, crashkernel in cmdline), w/ which Ian mentioned that he couldn't reproduce the problem. --- It also works on normal boot w/ r5d.metal (note 'd'), which should be the same as r5.metal but w/ four local nvme disks. (still boots from EBS/nvme disk in the same way as r5.metal) --- Similarly, it works on r4.24xlarge (this is not metal) but does boot from EBS/nvme disk too. --- So it seems like there's no problem with the patchset as in 4.15.0-1113-aws as it boots fine in several types w/ approx the same hardware config, just differing on normal/kexec in the r5.metal type (problem report.) - r5.metal: normal boot fails / kexec boot works - r5d.metal: normal boot works. - r5.24xlarge: normal boot works. The kexec boot worked ~20 times, so it wouldn't seem like a race condition is in place, as that should be enough runs, considering it failed every time on normal boot. Also, Ian mentioned that he couldn't reproduce w/ crashdump installed. Well, I think the only difference it would cause _before_ mounting the rootfs (assuming that's what doesn't work/allow machine to boot, as we have no serial console) is the crashkernel reservation? --- So, all this is a bit confusing, but seem to indicate again that there's no problem w/ the patchset per se, but perhaps something in booting this particular kernel on a particular instance type (r5.metal) which _might_ be related to normal/ kexec/crashkernel boot differences. More tomorrow. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1946149 Title: Bionic/linux-aws Boot failure downgrading from Bionic/linux-aws-5.4 on r5.metal To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/1946149/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
