erofs pointer corruption and kernel crash

[Arseniy Krasnov]

10.04.2026 13:22, Gao Xiang пишет:
> 
> 
> On 2026/4/10 18:10, Arseniy Krasnov wrote:
>>
>>
>> 10.04.2026 13:06, Gao Xiang пишет:
>>>
>>>
>>> On 2026/4/10 18:03, Arseniy Krasnov wrote:
>>>>
>>>>
>>>> 10.04.2026 13:01, Gao Xiang пишет:
>>>>>
>>>>>
>>>>> On 2026/4/10 17:59, Arseniy Krasnov wrote:
>>>>>>
>>>>>>
>>>>>> 10.04.2026 12:20, Gao Xiang wrote:
>>>>>>>
>>>>>>>
>>>>>>> On 2026/4/10 16:55, Arseniy Krasnov wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> ...
>>>>>>>
>>>>>>>>>>
>>>>>>>>>> BR2_TARGET_ROOTFS_EROFS=y
>>>>>>>>>> BR2_TARGET_ROOTFS_EROFS_CUSTOM_COMPRESSION=y
>>>>>>>>>> BR2_TARGET_ROOTFS_EROFS_COMPRESSION_ALGORITHMS="zstd,22 --max-extent-bytes 65536 -E48bit"
>>>>>>>
>>>>>>> btw, may I ask what's the erofs-utils version?
>>>>>>> erofs-utils 1.9?
>>>>>>
>>>>>> We have 1.8.5 erofs-utils
>>>>>
>>>>> 1.8.5 shouldn't have `-E48bit` support, that is my question.
>>>>
>>>> You mean to try to reproduce with 1.9 utils ?
>>>
>>> Nope, I meant
>>>
>>> BR2_TARGET_ROOTFS_EROFS_COMPRESSION_ALGORITHMS="zstd,22 --max-extent-bytes 65536 -E48bit"
>>>
>>> is invalid in erofs-utils 1.8.5.
>>>
>>> If you were using erofs-utils 1.9+, that may be due to
>>> the new `-E48bit`;
>>>
>>> but you said you are using erofs-utils 1.8.5, that makes
>>> me feel confused.
>>>
>>
>> Ah, ok, so need to debug it at kernel side as we talked before.
> 
> Sigh, you don't answer my questions:
> 
> 1. so are you using `-E48bit` and newer erofs-utils verison?
> 

Here is exact version which is built in buildroot:

> bin/mkfs.erofs
<E> erofs: missing argument: FILE
mkfs.erofs 1.8.10
Try 'bin/mkfs.erofs --help' for more information.

> 2. Is "EXPERIMENTAL 48-bit layout support in use. Use at your
>    own risk!" shown when mounting?

Yes


> dmesg | grep EXP
[    3.003188][    T1] erofs (device dm-0): EXPERIMENTAL 48-bit layout support in use. Use at your own risk!

Thanks

> 
> Thanks,
> Gao Xiang