[tmp]$ rm -rf python-*
[tmp]$ time rr record python -c 'for i in range(10000): print(i, flush=True)' > /dev/null

real    0m1.644s
user    0m1.003s
sys     0m0.668s
[tmp]$ rr replay -g=5000 python-0  # or -e etc.
0
1
2
3
4
5
[...]
989
990
991
992
993
994
995
996
997
GNU gdb (GDB) 15.1
Copyright (C) 2024 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
--Type <RET> for more, q to quit, c to continue without paging--c
Type "apropos word" to search for commands related to "word"...
No symbol table is loaded.  Use the "file" command.
Reading symbols from /usr/bin/python3.12...
(No debugging symbols found in /usr/bin/python3.12)
Really redefine built-in command "restart"? (y or n) [answered Y; input not from terminal]
Really redefine built-in command "jump"? (y or n) [answered Y; input not from terminal]
Remote debugging using 127.0.0.1:23770

--------------------------------------------------
 ---> Reached target process 744167 at event 5000.
--------------------------------------------------
Reading symbols from /usr/bin/../lib64/rr/librrpreload.so...
Reading symbols from /usr/lib/libdl.so.2...
(No debugging symbols found in /usr/lib/libdl.so.2)
Reading symbols from /usr/lib/libpython3.12.so.1.0...
(No debugging symbols found in /usr/lib/libpython3.12.so.1.0)
Reading symbols from /usr/lib/libc.so.6...
(No debugging symbols found in /usr/lib/libc.so.6)
Reading symbols from /usr/lib/libm.so.6...
(No debugging symbols found in /usr/lib/libm.so.6)
Reading symbols from /lib64/ld-linux-x86-64.so.2...
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
Reading symbols from /usr/lib/python3.12/lib-dynload/math.cpython-312-x86_64-linux-gnu.so...
(No debugging symbols found in /usr/lib/python3.12/lib-dynload/math.cpython-312-x86_64-linux-gnu.so)warning: BFD: warning: system-supplied DSO at 0x6fffd000 has a section extending past end of file
0x0000000070000002 in syscall_traced ()
(rr)