Ubuntu
initramfs-tools package

  1. Bug #1879987
  2. Comment #34

Comment 34 for bug 1879987

Revision history for this message
Mauricio Faria de Oliveira (mfo) wrote :

Verification done for bionic:

bionic-updates:

- boots fine w/ console=ttyS0, can ssh in 10 seconds.
- boot fails w/ console=ttyS1, cannot SSH, qemu on 100% CPU (initramfs-tools looping)

bionic-proposed:

- boots fine w/ console=ttyS0, can ssh in 10 seconds. (no regression)
- boots fine w/ console=ttyS1, can ssh in 10 seconds, qemu on low CPU% (issue fixed)

details:
-------

$ lsb_release -cs
bionic

bionic-updates:
---

$ dpkg -s initramfs-tools | grep -i version:
Version: 0.130ubuntu3.10

console=ttyS0:

 $ cat /proc/cmdline
 BOOT_IMAGE=/boot/vmlinuz-4.15.0-99-generic root=UUID=f513680e-7260-45e3-b4aa-89e4a210be77 ro console=ttyS0

console=ttyS1:

 (cannot SSH into system. CPU% always high for QEMU.)

 $ top -b -d1 | grep -e CPU -e qemu
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142522 libvirt+ 20 0 3745600 485332 23116 S 100.0 3.0 1:30.08 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142522 libvirt+ 20 0 3745600 485332 23116 S 99.0 3.0 1:31.08 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142522 libvirt+ 20 0 3745600 485332 23116 S 98.0 3.0 1:32.07 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142522 libvirt+ 20 0 3745600 485332 23116 S 99.0 3.0 1:33.07 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142522 libvirt+ 20 0 3745600 485332 23116 S 99.0 3.0 1:34.06 qemu-system-x86
 ^C

bionic-proposed:
---

$ dpkg -s initramfs-tools | grep -i version:
Version: 0.130ubuntu3.11

console=ttyS0:

 $ cat /proc/cmdline
 BOOT_IMAGE=/boot/vmlinuz-4.15.0-99-generic root=UUID=f513680e-7260-45e3-b4aa-89e4a210be77 ro console=ttyS0

console=ttyS1:

 (can SSH into system. CPU% low for QEMU)

 $ cat /proc/cmdline
 BOOT_IMAGE=/boot/vmlinuz-4.15.0-99-generic root=UUID=f513680e-7260-45e3-b4aa-89e4a210be77 ro console=ttyS1

     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142731 libvirt+ 20 0 3656512 602160 22816 S 83.2 3.7 0:38.73 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142731 libvirt+ 20 0 3656512 602160 22816 S 29.7 3.7 0:39.03 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142731 libvirt+ 20 0 3656512 602160 22816 S 1.0 3.7 0:39.04 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142731 libvirt+ 20 0 3656512 602160 22816 S 2.0 3.7 0:39.06 qemu-system-x86
     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  142731 libvirt+ 20 0 3656512 602160 22816 S 2.9 3.7 0:39.09 qemu-system-x86