GNU bug report logs - #75682
ls -l sometimes shows a year in place of the hour and minute

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From: Kasia <xo.okasia <at> proton.me>
To: 75682 <at> debbugs.gnu.org
Subject: bug#75682: ls -l sometimes shows a year in place of the hour and minute
Date: Mon, 20 Jan 2025 01:01:15 +0000

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Hello Coreutils maintainers,

I believe I've found a bug in the coreutils' ls command.

I was watching a file with watch and ls -l while it was being updated, but sometimes I saw that the time would display a year instead of an hour and minute.

Later I reproduced this issue by doing the following:
- open a terminal emulator
- create two tabs
- run `touch test`
- in tab 1, run
either
while (true); do { ls -l test; }; done;
or
while (true); do { ls -l test | grep -F 2025; }; done;
- in tab 2, run
while (true); do {
 head -c 1 </dev/urandom | grep '[0-9]' | xargs -r -I LENGTH truncate -cs LENGTH test;
}; done;

One tab randomly changes the length of file, while the other shows ls -l of the tile.

In tab 1 I see this:
-rw-r--r-- 1 katarzyna katarzyna 9 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 9 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 9 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 9 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 2 Jan 20  2025 test
-rw-r--r-- 1 katarzyna katarzyna 2 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 2 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 2 Jan 20 00:57 test
-rw-r--r-- 1 katarzyna katarzyna 2 Jan 20 00:57 test

Do you know what might be causing this if it's my system instead of coreutils' ls?

x Kasia
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