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Editorial Team
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Asked: 2026-06-05T23:27:09+00:00

I am trying to bring up Linux-3.4.1 on our cutom MIPS based hardware. It

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I am trying to bring up Linux-3.4.1 on our cutom MIPS based hardware. It hung after printing the line 

VFS:Mounted root (ubifs filesystem)

On further debugging, it was found that kernel is hanging in free_init_mem() [arch/mips/mm/init.c] . My debug prints to determine the place of hang in free_init_mem is as below :

Freeing unused kernel memory:  8038e000 - 803bb000
Freeing unused kernel memory: 8038e000 page
Freeing unused kernel memory: 8038f000 page
Freeing unused kernel memory: 80390000 page
Freeing unused kernel memory: 80391000 page
Freeing unused kernel memory: 80392000 page
Freeing unused kernel memory: 80393000 page
Freeing unused kernel memory: 80394000 page
.....
Freeing unused kernel memory: 803b4000 page
<hang>

Any help to debug the above hang will be very useful.

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1 Answer

  1. Editorial Team

    Just some random guessing: since it hangs after freeing the init memory, I would suspect that some code is incorrectly marked __init, or some data is incorrectly marked __initdata. So the corresponding pages are freed, and the kernel crashes when it needs this data.

    I guess you’ve done some custom kernel code to support your MIPS hardware. Double check your code to ensure that you haven’t made some mistakes on this.

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