Fwd: Bug#544305: load of some acpi.ko leads to panic on GNU/kFreeBSD

[Aurelien Jarno]

Hi all,

I am forwarding this mail from Petr Salinger about a problem with GRUB 2
loading acpi.ko (and probably other modules). 

In short due to recent changes in the toolchain (not yet identified), 
the modules are not page aligned anymore, and contains a .comment 
section. This does not causes any problem when using the original 
FreeBSD loader, but this causes a kernel panic when used with GRUB 2.

This is reported in Debian as bug#544305 [1].

Don't hesitate to ask if you want more details or tests.

Thanks,
Aurelien

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=544305


On Sun, Aug 30, 2009 at 04:40:33PM +0200, Petr Salinger wrote:
> Package: grub2
> User: address@hidden
> Usertags: kfreebsd
> X-Debbugs-CC: address@hidden, address@hidden
>
>
> 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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-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net