[bug #37331] GRUB 2 hangs when booting from USB drive on HP laptop DV7-6190

[Giuseppe Caizzone]

URL:
  <http://savannah.gnu.org/bugs/?37331>

                 Summary: GRUB 2 hangs when booting from USB drive on HP
laptop DV7-6190
                 Project: GNU GRUB
            Submitted by: peppepz
            Submitted on: mar 11 set 2012 15:18:05 GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Bazaar - trunk
         Reproducibility: None
         Planned Release: None

    _______________________________________________________

Details:

If I attempt to boot GRUB 2 on my laptop over a USB drive, GRUB hangs after
the "Welcome to GRUB!" message. Both GRUB 2.00 and Bazaar trunk behave in the
same way.

After it hangs, the PC fan spins up, and CTRL-ALT-DEL doesn't work.

This might be the same problem reported at comment #5 of this bug report:
https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=805747

The laptop is model DV7-6190, Sandy Bridge-based with 8 GB RAM and switchable
Ati/Intel graphics. Its BIOS is UEFI-based itself, but it only boots OSes in
legacy mode.

The problem seems to be related to the BIOS' "USB legacy support", because if
I boot GRUB from a CD, it works fine, and it can load Linux successfully. If I
boot GRUB from a CD while having a USB drive attached at power up, it still
works as long as I don't access the USB drive. For instance, if I type "ls" at
the GRUB prompt, it will hang.

I installed GRUB with --debug-image=all, and the messages I get before the
crash are:

| kern/disk.c:230: Opening 'hd0, msdos1' ...
| partmap/msdos.c: 181: partition 0: flag 0x80, type 0x7, start 0x800, len
0x12a18000
| Detecting ntfs ...

I tried renaming the i386-pc directory. This way, GRUB does start in rescue
mode without crashing, even when booted via USB. I then tried to manually
insmod some random modules. Some of them load, others crash the machine in the
usual way.

Working: adler32, crypto, extcmd, hexdump, search_fs_uuid, terminal, time

Crashing: hashsum, lsusb, lspci, mmap, normal, search, usb

Hexdumping the crashing modules' files does work, so GRUB is able to load them
before crashing.

Sometimes I also get this additional error message:

disk/i386/pc/biosdisk.c: 303: Read error when probing drive 0x82

but it doesn't crash the machine, and it doesn't always happen.




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?37331>

_______________________________________________
  Messaggio inviato con/da Savannah
  http://savannah.gnu.org/