I didnt say that you JUST look for this three....
In the strace output you will find the origin of hang or dead
I told you that "usually" are those three, usually is not always.
Troubles USUALLY come because of E* return codes, EPERM, EACESS, EINVAL, Ewhateveryouwant.... It should serve you as a starting point
to your investigation. If you find one E* you can check the syscall
that origins that, in the example I put you before with statx and ENOENT,
do "man statx" and at the end of manpage you will find the exception
to this syscall as "ENOENT A component of pathname does not exist
or pathname is an empty string and AT_EMPTY_PATH was not specified in flags"
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