[bug #60249] Loading Linux on Vortex86 results in reboot

[Jens Mölzer]

URL:
  <https://savannah.gnu.org/bugs/?60249>

                 Summary: Loading Linux on Vortex86 results in reboot
                 Project: GNU GRUB
            Submitted by: jmlzr
            Submitted on: Wed 17 Mar 2021 03:08:15 PM UTC
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Hardware-specific
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: other
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

The GRUB CLI and menu work fine but loading a Linux kernel results in a
blinking cursor followed by a reboot after ~1s.

GRUB Release: 2.04 (couldn't select that in the "Release" drop down)

GRUB and Linux (5.10.19) are built via Buildroot. (GCC 10, binutils 2.35.2,
musl as libc, tried it with and without the GRUB patches provided by
Buildroot)

Booting the disk image via qemu (`qemu-system-i386 -hda disk.img -nographic
-cpu 486') works fine and boots the Linux Kernel. But running the same image
(written with dd to disk) on a Vortex86SX (essentially a faster clocked
i486SX) fails. The HW boots via BIOS/MBR from an IDE disk.

The same Linux kernel works fine on the same HW when booted via PXELINUX so I
assume this is a bug in GRUB.

Using `set debug=all` the last few lines before the reboot are:

lib/relocator.c:1197: allocated: 0x18ae000+0x33
lib/relocator.c:1545: Relocs allocated at 0x18ae000
lib/relocator.c:1558: chunk 0xffabd30->0x1000, 0xd0
lib/relocator.c:1558: chunk 0xff9fbf0->0x8b000, 0x5000
lib/relocator.c:1558: chunk 0x100000->0x100000, 0x17ae000
lib/relocator.c:1602: sorted chunk 0x100000->0x100000, 0x17ae000
lib/relocator.c:1602: sorted chunk 0xff9fbf0->0x8b000, 0x5000
lib/relocator.c:1602: sorted chunk 0xffabd30->0x1000, 0xd0

See the attached file for the full debug log (I replaced the part where the
menu was displayed with `[menu]` and cut out repetitive messages from
`fat.c:552` where it says `[cut 8440 lines]`.



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File Attachments:


-------------------------------------------------------
Date: Wed 17 Mar 2021 03:08:15 PM UTC  Name: grub_log  Size: 16KiB   By: jmlzr

<http://savannah.gnu.org/bugs/download.php?file_id=51081>

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