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Truncate max FAT32 file to 0 #208

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AHalvar opened this issue Mar 8, 2024 · 0 comments

AHalvar commented Mar 8, 2024

Steps to reproduce:

Running on RHEL 9.3 fsck from util-linux 2.37.4 which includes version 4.2. (built 2021-01-31)
Plug in an off-the-shelf USB thumb drive into the RHEL computer
Create a file on the thumb drive with the maximum allowed file size for a FAT32 file system, (4GiB - 1 byte) = 4294967295 bytes
sync the file and file system
Run: fsck -a -v file_on_usb

Expected:
fsck completes successfully without changing the file

Actually:
The file is truncated to 0 bytes.
fsck outputs:

...
file_on_usb
  File size is 4294967295 bytes, cluster chain length is 0 bytes.
  Truncating file to 0 bytes.
Reclaiming unconnected clusters.
Checking free cluster summary.

*** Filesystem was changed***

Workaround:
Create a file with more margin, e.g. 4GiB - 512 KiB. This passes the fsck check.
See also https://groups.google.com/g/linux.debian.bugs.dist/c/bocRgz6fCGU

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