Re: [Qemu-devel] alpha platform is missing files after initrd load

[Stefan Hajnoczi]

On Thu, Oct 20, 2016 at 12:45:37PM +0200, Dennis Luehring wrote:
> qemu: 2.7.x (git head)
> platform: Alpha (Clipper)

Two options:

1. Not many people use Alpha.  You may need to debug this yourself by
   learning about the Linux alpha boot protocol (where the initramfs is
   loaded and how big that region of memory may be).  Then you can
   verify the memory contents after QEMU has loaded the
   kernel/initramfs using monitor commands to read memory.  You may need
   to look at QEMU's kernel/initramfs loading code to see what it's
   doing.

2. If it worked in a previous QEMU version, please use git-bisect(1) to
   find out which commit broke it.

Good luck!

> kernel: 4.7.0
> gcc: 6.1
> 
> i don't know if its an qemu oder linux kernel problem
> 
> i've got an ~360MB big_initrd.cpio and it sometimes happen(seems so) that
> there are files missing after the kernel loaded the initrd
> this does not happen with the same programs/initrd compiled for the sparc64
> platform using qemu
> 
> i've got a small C/C++-based init that prints some infos about the system
> and
> prints the content of the /tools/bin folder and there a some files missing
> that are
> definitely in the cpio file
> 
> im starting qemu with
> 
> alpha-softmmu/qemu-system-alpha -m 1GB -nographic -monitor
> telnet::4440,server,nowait -serial telnet::3000,server -kernel clfskernel
> -append 'console=ttyS0' -initrd big_initrd.cpio
> 
> i've found a problem description on stackoverflow going in the same
> direction but im not using an in-kernel-ramfs
> http://stackoverflow.com/questions/31524636/files-disappearing-from-initramfs
> 
> i've uploaded my complete test here:
> http://www.filedropper.com/testalpha-linux-470gcc-610 (~66MB)
> 
> containing files:
> big_initrd.cpio -> the big cpio which misses files after load
> clfskernel -> linux 4.7.0 (default settings)
> config -> used config
> init.cpp -> my init
> initrd.cpio -> only kernel+init cpio
> kernel.out.txt -> output of the kernel and init
> start_big.sh -> my starting script for qemu loading big_initrd.cpio
> start_small.sh -> my starting script for qemu loading initrd.cpio
> System.map -> kernel map file
> tools_dir_after_load.txt -> files in /tools/bin (copy&paste+sort from
> kernel.out.txt printdir /tools/bin)
> tools_dir_in_cpio.txt -> files in the cpio:/tools/bin
> 
>

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