Bug#544305: load of some acpi.ko leads to panic on GNU/kFreeBSD
Package: grub2
User: debian-bsd@lists.debian.org
Usertags: kfreebsd
X-Debbugs-CC: debian-bsd@lists.debian.org, grub-devel@gnu.org
Hello,
we have some problems with grub2 and loading acpi.ko for FreeBSD kernel.
With some acpi.ko the kernel panics. The same kernel without acpi.ko
boots fine. See also thread started by
http://lists.debian.org/debian-bsd/2009/08/msg00147.html
It is still unclear what the real reason is,
so far only acpi enable boots are affected.
It looks like the problem lies in interaction
between gnu linker and grub bootloader and FreeBSD kernel.
Maybe only GRUB 2 based installation are affected,
the kfreebsd-loader loads acpi.ko from 7.2-5 fine.
There are 3 different version of acpi.ko,
compiled by different binutils and/or different linking parameters.
a) acpi_725_fail.ko
b) acpi_b20090805_fail.ko
c) acpi_b20090723_works.ko
The only difference between b) and c) is .comment section.
After "objcopy --remove-section=.comment" it loads also fine.
The interesting might be parts of "readelf -l -S",
the differences are:
Program Headers:
a)
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x00000000 0x00000000 0x54248 0x54248 R E 0x1000
LOAD 0x054248 0x00055248 0x00055248 0x02414 0x03c84 RW 0x1000
DYNAMIC 0x054248 0x00055248 0x00055248 0x00078 0x00078 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
b), c)
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x00000000 0x00000000 0x54008 0x54008 R E 0x1000
LOAD 0x055000 0x00055000 0x00055000 0x0241c 0x03c8c RW 0x1000
DYNAMIC 0x055000 0x00055000 0x00055000 0x00078 0x00078 RW 0x4
GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
Length and attributes of .comment section
a) [15] .comment PROGBITS 00000000 05665c 000cd8 01 MS 0 0 1
b) [15] .comment PROGBITS 00000000 05741c 000cd8 01 MS 0 0 1
c) [15] .comment PROGBITS 00000000 05741c 001cef 00 0 0 1
I will try to attach all acpi.ko to the debian BTS later.
Petr
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