Hi, I'm running an ARM FVP (virtual platform - simluated hardware), which is failing to reach a login prompt due to extremely slow progress during boot. systemd gives up waiting for the ttyAMA0 device to appear, and never starts the getty.
I've bisected this to commit 4cd13c21b207 "softirq: Let ksoftirqd do its job". Without this commit, the system boots to a login prompt in 2 minutes. With this commit, the system eventually manages to bring up sshd after 22 minutes, but as mentioned, the dev-ttyAMA0.device unit has timed out and so I don't get a prompt on my console. I only hit the issue when my rootfs is mounted over NFS, and with only a single core enabled. The (simulated) network device is an SMC91C111. With multiple cores enabled or a non-NFS filesystem, everything seems to work OK. I don't have an identical real hardware platform to try, but I could not reproduce it on a real ARM Juno board, which is similar. It looks from the logs that udev's workers are unable to make progress, so the device nodes don't get created. Don't pay too much attention to the timestamps in the logs below, they are "inside" the virtual platform, and don't reflect wall-clock time. Log before 4cd13c21b207: https://drive.google.com/open?id=0B8siaK6ZjvEwMktoa0NUS2hJd1U Log after 4cd13c21b207: https://drive.google.com/open?id=0B8siaK6ZjvEwZXlfeFFSQl9xZTQ Kernel config: arch/arm64/configs/defconfig I'm not sure how to debug this further, so if you have any suggestions I'd be glad to hear them. Many thanks, Brian