[Bug gprofng/31460] heap tracing causes infinite recursion on calloc with multi-threaded applications

[carlsonj at workingcode dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31460

--- Comment #2 from James Carlson <carlsonj at workingcode dot com> ---
First of all, your test case:

% gcc -pthread t.c
t.c:3:11: warning: built-in function 'calloc' declared as non-function
[-Wbuiltin-declaration-mismatch]
    3 | long long calloc = 0;
      |           ^~~~~~
% ./a.out 
% echo $?
0

That works fine. The machine itself is running Ubuntu 22.04.4 LTS (Jammy
Jellyfish).

I made a clean sandbox and found no trouble at all with "-H on", so it's
clearly related to something else in my environment. I'll spend some time
searching. In the meantime, this can probably be closed out as "cannot
reproduce" until I get to the bottom of whatever's going on.

It's definitely reproducible and happens all the time in the giant proprietary
C++ application I'm working on and in these tiny test programs when compiled
inside that same environment, but I don't know yet how or why. Something causes
collector's calloc hook to end up invoking itself.

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