linux-kernel - [BUG] vfat garbled mtimes (e57260ae3226bda354e6e5c838c62a6a88c2c5bc)

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Message-ID: <CABq1_vgwYJpqKkWzw4U=s-fmZ94Tzu6wCXxw=O84wX6bf0WFfA@mail.gmail.com>
Date:   Wed, 18 Oct 2023 00:31:04 +0200
From:   Klara Modin <klarasmodin@...il.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jlayton@...nel.org, brauner@...nel.org
Subject: [BUG] vfat garbled mtimes (e57260ae3226bda354e6e5c838c62a6a88c2c5bc)

Hi,

https://lore.kernel.org/r/20231004185347.80880-35-jlayton@kernel.org
causes garbled mtimes for me on vfat.

(next-20231017, e57260ae3226bda354e6e5c838c62a6a88c2c5bc fat: convert
to new timestamp accessors)

Kind regards,
Klara Modin

Examples:
# touch test && sync && ls -l && stat test
total 0
-rwxr-xr-x 1 root root 0 20 jan  -3904093 test
  File: test
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 8,17    Inode: 4           Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-10-17 02:00:00.000000000 +0200
Modify: -3904093-01-20 12:54:32.134624768 +0053
Change: 2023-10-18 00:05:50.000000000 +0200
 Birth: 2023-10-17 23:07:39.500000000 +0200
# touch test && sync && ls -l && stat test
total 0
-rwxr-xr-x 1 root root 0 26 maj  1916 test
  File: test
  Size: 0             Blocks: 0          IO Block: 4096   regular empty file
Device: 8,17    Inode: 4           Links: 1
Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-10-17 02:00:00.000000000 +0200
Modify: 1916-05-26 13:50:39.*(0'(*(,- +0200
Change: 2023-10-18 00:06:10.000000000 +0200
 Birth: 2023-10-17 23:07:39.500000000 +0200