Re: 3.4.0-rc1: No init found

On Tue, 3 Apr 2012 at 18:08, Benjamin Herrenschmidt wrote:

I have observed this randomly on the G5 ... sometimes, if I try again,
it works... it's very very odd. There is some kind of race maybe with
async startup ? Or a problem with the vfs path walking ? It's certainly
not easily reproducable for me, it goes away from one boot to the next.

It's 100% reproducible for me. This PowerBook G4 (1.25Ghz) is not the 
fastes though, maybe a race triggers more easily here...?

quoted

PS: Unfortunately I cannot boot into the old (3.3-rc7) kernel 
    right now (which is still installed via "yaboot" and present in
    /boot), because of this: 
    http://nerdbynature.de/bits/3.4.0-rc1/init/mac-invalid-memory.JPG
    Booting into Debian's "squeeze" kernel (2.6.32) which resides in
    the same /boot directory succeeds.

Hrm, did it used to boot ?

I'm using the "backup" kernel only when the new one has an issue, so I 
have not tested it for a while, but it used to work, for sure.

Can you do printenv in OF and tell me what
your load-base, real-base, virt-base etc... are ?

load-base is 0x800000, real-base and virt-base is set to "-1", please see
http://nerdbynature.de/bits/3.4.0-rc1/init/printenv-1.JPG

Not sure if this is related, but at the end of each kernel compilation, 
the following messages are printed:

------------
  SYSMAP  System.map
  SYSMAP  .tmp_System.map
  WRAP    arch/powerpc/boot/zImage.pmac
INFO: Uncompressed kernel (size 0x6e52f8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
  WRAP    arch/powerpc/boot/zImage.coff
INFO: Uncompressed kernel (size 0x6e52f8) overlaps the address of the wrapper(0x500000)
INFO: Fixing the link_address of wrapper to (0x700000)
  WRAP    arch/powerpc/boot/zImage.miboot
INFO: Uncompressed kernel (size 0x6d4b80) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x700000)
  Building modules, stage 2.
  MODPOST 24 modules
------------

I started to see these messages in January (around Linux 3.2.0), but never 
investigated what it was since the produced kernels continued to boot just 
fine.

Might also be worth updating yaboot, debian should have 1.3.16 nowadays.

Debian/stable still has 1.3.13a, I'll try to install 1.3.16 from 
Debian/testing.

Thanks for your help,
Christian.
-- 
BOFH excuse #217:

The MGs ran out of gas.