[Bug 1892292] Re: iscsi boot fails to boot into rootfs

[xinliang]

Hi Lucas,
It seems that after I added "root=LABEL=cloudimg-rootfs" kernel cmdline parameter into grub.cfg, it doesn't happen again.

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https://bugs.launchpad.net/bugs/1892292

Title:
  iscsi boot fails to boot into rootfs

Status in open-iscsi package in Ubuntu:
  Triaged
Status in open-iscsi source package in Focal:
  Triaged

Bug description:
  iscsi boot fails to boot into rootfs, due to iscsi root disk is not
  available in time and mount root fails.

  After add 10 secs delay, it can boot into iscsi root disk
  successfully. It seems that 'udevadm settle' is not enough to wait for
  iscsi disk is available.

  --- a/debian/extra/initramfs.local-top
  +++ b/debian/extra/initramfs.local-top
  @@ -312,6 +312,7 @@ udevadm settle
   # initramfs scripts, but our loop that scans /proc/cmdline will still detect
   # the former and set proper parameters.
   if [ -n "$ISCSI_HAD_ROOT" ] && [ x"${ROOT##iscsi:}" != x"${ROOT}" ] ; then
  +       sleep 10 # wait for iscsi disk is available"
          if [ -z "$ISCSI_ROOT_LUN" ] ; then
                  ISCSI_ROOT_LUN=0
          fi

  grub.cfg
  --------
  menuentry "boot_iscsi"  {
      linux f5d8200d-f65a-44ef-869e-17519090168d/kernel ro text nofb nomodeset console=ttyAMA0 systemd.journald.forward_to_console=yes ipa-debug=1  boot_server=10.30.96.1 ip=dhcp iscsi_initiator=iqn.2017-05.org.openstack.node-0 iscsi_username=iqn.2017-05.org.openstack.node-0 iscsi_password=z9v6JQ6eQRxLzDK5 root=iscsi:10.30.96.1::3260:0:iqn.1993-08.org.opendev:01:a9aa4032d2c1
      initrd f5d8200d-f65a-44ef-869e-17519090168d/ramdisk
  }

  Software
  --------
  stack at j12-d05-07:~/ipxe/src$ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description: Ubuntu 20.04 LTS
  Release: 20.04
  Codename: focal
  stack at j12-d05-07:~/ipxe/src$ uname -a
  Linux j12-d05-07 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

  open-iscsi/focal-updates,now 2.0.874-7.1ubuntu6.1 arm64 [installed]
    iSCSI initiator tools

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