I'm running the latest GNU Parallel from Homebrew on Mac OS 10.15 "Catalina". I was testing the speed of commands and used /usr/local as a test case as it contains Homebrew and lots of files and it led to parallel saying I found a bug.
I tried to isolate it down. 'a.gz' has @ symbols and for some reason causes a bug with fewer characters, while 'b.gz' does not and needs more characters to cause a bug.
Interestingly the directory path is exactly 32 characters, it succeeds if the directory path is 31 characters.
% parallel --version
GNU parallel 20200422
[snip]
% uname -a
Darwin MacBook-Pro.local 19.2.0 Darwin Kernel Version 19.2.0: Sat Nov 9 03:47:04 PST 2019; root:xnu-6153.61.1~20/RELEASE_X86_64 x86_64
To replicate:
1. Make a directory, with the following name
/tmp/012345678901234567890123456
2. Gunzip both a.gz and b.gz and move them into it
3. Run the following with both 'a' and 'b'. Shown running with 'a'"
< a parallel --xargs -0 stat > /dev/null
Leads to:
(Then *lots* of text!)
b.gz