** Tags added: sts
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1865145
Title:
Ubuntu Bionic freezes on Supermicro hardware when console redirection
is configured in kernel parameters
Status in linux package in Ubuntu:
Incomplete
Bug description:
STEPS TO REPRODUCE
1. Use MAAS for deploying Ubuntu on bare metal servers.
2. Enable serial-over-lan in BIOS.
3. Enable console redirection in kernel parameters:
console=tty0 console=ttyS1,115200n8
4. Connect to the ipmi console to watch the boot and installation process
ipmiconsole -u <user> -p <pass> -h <host>
5. Start deploying the server with MAAS (bionic, GA kernel)
It may require several re-deployments until you experience the issue. In my
case, I'm deploying 9 bare metal machines at the same time. The issue typically
surfaces on one random node, 50% of the time.
6. During the deployment, after first reboot, typically during execution of
cloud-init scripts, the ipmi console freezes. Typically in the middle of
printing out some output.
You can still SSH to the node. While being logged into the node:
- running 'ps aux' takes more than 20 seconds,
- running 'systemctl' times out,
- the number of zombie processes increases.
Sometimes, running 'sosreport' unblocks the node, so that cloud-init scripts
finish executing and the node shuts down as expected.
Sometimes, only logging into the node with SSH unblocks it.
7. Eventually, after 30 minutes, MAAS marks the node as "Failed
deployment".
WORKAROUND
Remove console redirection from kernel parameters (console=tty0
console=ttyS1,115200n8).
AFFECTED HARDWARE
Supermicro SYS-2029U-TR4
https://www.supermicro.com/en/products/system/2U/2029/SYS-2029U-TR4.cfm
OTHER
The issue does not affect Xenial with GA kernel.
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