linux-kernel - Re: Executable loading issues with erofs on arm?

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Message-ID: <2bfd263e-d6f7-4dcd-adf5-2518ba34c36b@linux.alibaba.com>
Date: Tue, 8 Jul 2025 23:36:57 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Jan Kiszka <jan.kiszka@...mens.com>, Gao Xiang <xiang@...nel.org>,
 Chao Yu <chao@...nel.org>, linux-erofs@...ts.ozlabs.org
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Executable loading issues with erofs on arm?



On 2025/7/8 23:32, Gao Xiang wrote:
> 
> 
> On 2025/7/8 23:22, Jan Kiszka wrote:
>> On 08.07.25 17:12, Gao Xiang wrote:
>>> Hi Jan,
>>>
>>> On 2025/7/8 20:43, Jan Kiszka wrote:
>>>> On 08.07.25 14:41, Jan Kiszka wrote:
>>>>> Hi all,
>>>>>
>>>>> for some days, I'm trying to understand if we have an integration issue
>>>>> with erofs or rather some upstream bug. After playing with various
>>>>> parameters, it rather looks like the latter:
>>>>>
>>>>> $ ls -l erofs-dir/
>>>>> total 132
>>>>> -rwxr-xr-x 1 1000 users 132868 Jul  8 10:50 dash
>>>>> (from Debian bookworm)
>>>>> $ mkfs.erofs -z lz4hc erofs.img erofs-dir/
>>>>> mkfs.erofs 1.8.6 (trixie version, but same happens with bookworm 1.5)
>>>>> Build completed.
>>>>> ------
>>>>> Filesystem UUID: aae0b2f0-4ee4-4850-af49-3c1aad7fa30c
>>>>> Filesystem total blocks: 17 (of 4096-byte blocks)
>>>>> Filesystem total inodes: 2
>>>>> Filesystem total metadata blocks: 1
>>>>> Filesystem total deduplicated bytes (of source files): 0
>>>>>
>>>>> Now I have 6.15-rc5 and a defconfig-close setting for the 32-bit ARM
>>>>> target BeagleBone Black. When booting into init=/bin/sh, then running
>>>>>
>>>>> # mount -t erofs /dev/mmcblk0p1 /mnt
>>>>> erofs (device mmcblk0p1): mounted with root inode @ nid 36.
>>>>> # /mnt/dash
>>>>> Segmentation fault

Two extra quick questions:
  - If the segfault happens, then if you run /mnt/dash again, does
    segfault still happen?

  - If the /mnt/dash segfault happens, then if you run
      cat /mnt/dash > /dev/null
      /mnt/dash
    does segfault still happen?

Thanks,
Gao Xiang