Request for Input on UBI System Issues

[Miquel Raynal]

Hi Nikhil,

> > PC is at ____cache_alloc+0x60/0x790
> > [<c01ec1c4>] (____cache_alloc) from [<c01ecb94>] (__kmalloc+0x58/0xb8)
> > [<c01ecb94>] (__kmalloc) from [<c01c1f64>] (kvmalloc_node+0x40/0x74)
> > [<c01c1f64>] (kvmalloc_node) from [<c021c3d4>] (seq_read+0x17c/0x38c)
> > [<c021c3d4>] (seq_read) from [<c0250420>] (proc_reg_read+0x58/0x6c)
> > [<c0250420>] (proc_reg_read) from [<c01fbfb8>] (__vfs_read+0x2c/0xe4)
> > [<c01fbfb8>] (__vfs_read) from [<c01fc0fc>] (vfs_read+0x8c/0xa8)
> > [<c01fc0fc>] (vfs_read) from [<c01fc2d0>] (ksys_read+0x74/0xc4)
> > [<c01fc2d0>] (ksys_read) from [<c0101000>] (ret_fast_syscall+0x0/0x54)

> > [2024-06-11 08:35:05.502] PC is at ____cache_alloc+0x60/0x790
> > [2024-06-11 08:35:05.653] [<c01ea94c>] (____cache_alloc) from > [<c01eb31c>] (__kmalloc+0x58/0xb8)
> > [2024-06-11 08:35:05.659] [<c01eb31c>] (__kmalloc) from [<c01c00f0>] > (kvmalloc_node+0x40/0x74)
> > [2024-06-11 08:35:05.669] [<c01c00f0>] (kvmalloc_node) from > [<c021ac4c>] (seq_read+0x17c/0x38c)
> > [2024-06-11 08:35:05.672] [<c021ac4c>] (seq_read) from [<c01fa740>] > (__vfs_read+0x2c/0xe4)
> > [2024-06-11 08:35:05.679] [<c01fa740>] (__vfs_read) from [<c01fa884>] > (vfs_read+0x8c/0xa8)
> > [2024-06-11 08:35:05.682] [<c01fa884>] (vfs_read) from [<c01faa58>] > (ksys_read+0x74/0xc4)
> > [2024-06-11 08:35:05.689] [<c01faa58>] (ksys_read) from [<c0101000>] > (ret_fast_syscall+0x0/0x54)

...

> I am using a NAND device for testing UBI commands. My workflow
> involves initializing the device by formatting it with UBI, creating a
> volume, and attaching that partition.
>
> After detaching the partition, I perform some raw NAND operations.

I guess modifying manually the content is supposed to crash, but not
crash the kernel like that. What did you do exactly? Both in terms of
modifications and access when it crashes (looks like you're using
'cat').

> However, when I attempt to mount the UBI node afterward, I encounter 
> above listed *case no 1* and *case no 2* error message.
> This issue suggests a problem with the compatibility of the UBI and 
> UBIFS modules with the currently running kernel, which needs to be
> resolved to successfully mount the UBI node after performing raw
> operations.

Thanks,
Miquèl