Public bug reported:
Description:
efi boot application of live media (e.g. usb and DVD) will boot to unexpected
media or partitions with (device)/.disk/info
Here shows one of the way to reproduce this bug by live usb and live DVD plug
in the same laptop together
System configuration:
OS: ubuntu 12.04.2
Kernel: 3.8.0-19-generic #29
Bios and Hardware info:
I tested this bug on different machine and make sure it is directly related
to grub2
Prepare a machine with uefi bootable is enough
Steps to reproduce this bug:
1. prepare live usb and live DVD with image ubuntu 12.04.2 64bit [1]
2. make show there is no more something like live media or recovery partitions
of hard disks on your laptop. More precisely, make sure there is no such file
and directory (some devices)/.disk/info except those media prepared in step 1.
3. make sure the bios of the laptop we are going to use has set the uefi enable
4. plug in the live usb and DVD together on the same laptop
5. power on the laptop
6. open the uefi boot menu entry - it may be hot key F9 (for HP) or something
like DEL, depending on your laptop bios support
7. select the boot efi application of efi/bootx64.efi under DVD manually
8. wait at least 5 seconds, and select "Try Ubuntu without installing" at the
grub prompt menu [2]
9. when booting to desktop, open the terminal (for example by "ctrl + alt + t")
and use the command "df"
Expected result:
/dev/sr0 (or any of your DVD rom device number with the live DVD) mounted on
/cdrom
Actual result:
/dev/sdb1 (or any of your USB device number with the live usb) mounted on /cdrom
Additional information:
[1]
in fact, both of ubuntu 12.04.2 64bit and 13.04 64bit could reproduce this bug
as well.
You can make a live usb or dvd with one of the images.
That is, there are 4 kinds of usb-dvd combinations could reproduce this bug.
[2]
If this bug could not be reproduced, it may be blocked by another issue:
Casper missing to access usb at the scanning the /sys/block
Please make sure you were not blocked by this issue by
1. at the grub prompt menu entry, press "e" on the entry "Try Ubuntu without
installing"
2. append "debug" at the end of this statement "linux /casper/vmlinuz.efi
...... splash --"
3. press F10 to boot from this modified grub boot entry
4. after booting to desktop, open the terminal (for example by "ctrl + alt + t")
5. check whether /dev/sdb1(or any of your live usb device number) was raised by
the following casper script in /dev/.initramfs/initramfs.debug
script/casper:
find_livefs() {
......
# or do the scan of block devices
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | egrep -v
"/(loop|ram|fd)"); do
devname=$(sys2dev "${sysblock}")
[ -e "$devname" ] || continue
fstype=$(get_fstype "${devname}")
......
}
wait for 5 seconds seems to make the kernel probe the usb correctly
[3]
The efi/boot/BOOTx64.efi of 12.04.2 and 13.04 are the same
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1198846
Title:
[efi boot to unexpected media] plug in live usb and DVD at the same
time, try to boot from DVD but it comes to usb
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