** Description changed:
- This issue was discovered with Ubuntu Wily (15.10) on a currently in
- development ARM64 HW.
+ [Impact]
+ PXE booting of UEFI systems is very slow, to the point that some systems
timeout.
- When loading kernel via tftp in grub on this hardware, the system stops
- receiving new packets (times out ) after receiving initial few tens of
- tftp data packets , which then causes kernel load failure.
+ [Test Case]
+ PXE boot a UEFI-based system (d-i or MAAS) and monitor the time it takes for
GRUB to download the kernel/initrd. tcpdump will show TFTP timeouts, and it can
take on the order of minutes to begin running the kernel.
- Running tcpdump before loading kernel in grub menu shows timeouts
- occurring, as captured in the below log :
-
- http://kernel.ubuntu.com/~ming/grub/apm.tcpdump
-
- Following are the detailed reproduction steps :
-
- 1) setup PXE boot entry in UEFI(no any parameter to grub)
- 2) build one grub from upstream (and/or Wily) and put it in PXE&TFTP server
- 3) setup grub config, suppose the shape is like below:
- menuentry 'Install for arm64' {
- linux /ubuntu-installer/arm64/Image --- console=ttyS0,115200
- initrd /ubuntu-installer/arm64/initrd.gz
- }
- 4) start PXE booting in UEFI
- 5) grub prompt is coming
- 6) select 'Install for arm64' menu item and press 'enter' to start
- loading kernel
- 7) then hangs inside loading kernel
+ [Regression Risk]
+ The fix is restricted to UEFI-based systems. For those systems, it could lead
to a regression if Managed Network Protocol is required to remain active while
GRUB is performing the network boot.
** Also affects: grub2 (Ubuntu Vivid)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Wily)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: grub2 (Ubuntu Wily)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: grub2 (Ubuntu Vivid)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: grub2 (Ubuntu Trusty)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: grub2 (Ubuntu)
Importance: Undecided => High
** Changed in: grub2 (Ubuntu Trusty)
Importance: Undecided => High
** Changed in: grub2 (Ubuntu Vivid)
Importance: Undecided => High
** Changed in: grub2 (Ubuntu Wily)
Importance: Undecided => High
** Changed in: grub2 (Ubuntu Trusty)
Status: New => In Progress
** Changed in: grub2 (Ubuntu Wily)
Status: New => In Progress
** Changed in: grub2 (Ubuntu Vivid)
Status: New => In Progress
** Changed in: grub2 (Ubuntu)
Status: Confirmed => In Progress
** Changed in: grub2 (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1508893
Title:
TFTP timeout when booting from grub that was PXE loaded
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