[Bug 272434] du and disk operations (like mv,cp,shutil.move/rmtree,os.rename) combination issues

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 10 Jul 2023 12:16:42 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272434

--- Comment #6 from shamsher <meetshamsher@gmail.com> ---
Also just for info when replacing df from du then not seeing hang in any
folder.
Looks with df combination it's working fine but not with du combination.

$ cat du.py 
import os
import time;
while 1:
    os.system("du /")     <<-- here replaced du with df
    time.sleep(5)

note: dir1: subdir + file have been created inside /data/infra folder as below:
$ cat createfiles.py 
import os
i = 0
import time
while i < 50:
    j = 0
    path = "/data/infra/dir1/dir" + str(i)
    os.makedirs(path)
    while j < 10:
        path1 = "/data/infra/dir1/dir" + str(i) + "/file" + str(j)
#        cmd = "touch " + path1
#        os.system(cmd)
        f = open(path1,"w")
        f.write("Hit the issue")
        j += 1
    i+=1

Steps : 1- create dir : /data/infra
        2- inside above folder execute "python createfiles.py"
        3- run "python mode-move-delete.py >/dev/null & "
        4- run "python du.py > /dev/null &"
Wait for sometime issues will get hit in one of the folder.
Sys config/resource- cpu:1, RAM:128M, Disk:250GB

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