Medium - The Mystery of the Endless HTTPS Call

gdb.sh

$ gdb -i <PID>

(gdb) info threads
  Id   Target Id         Frame 
* 1    Thread 0x7fad2abbe680 (LWP 17394) "python" 0x00007fad2a189081 in __GI___libc_read (fd=5, buf=0x56395f61e5d3, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:27

(gdb) t
[Current thread is 1 (Thread 0x7fad2abbe680 (LWP 17394))]

(gdb) bt
#0  0x00007fad2a189081 in __GI___libc_read (fd=5, buf=0x56395f61e5d3, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fad2824db7e in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#2  0x00007fad28248fba in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#3  0x00007fad28247e53 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#4  0x00007fad28248403 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
#5  0x00007fad26d66913 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#6  0x00007fad26d6afbd in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#7  0x00007fad26d686c2 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#8  0x00007fad26d6f995 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#9  0x00007fad26d7a232 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#10 0x00007fad26d7a353 in SSL_read () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1
#11 0x00007fad26fe3247 in _ssl__SSLSocket_read_impl (buffer=0x7ffc9eef3300, buffer=0x7ffc9eef3300, group_right_1=<optimized out>, len=8192, self=0x7fad26a8e440)
    at /tmp/python-build.20201030105347.4623/Python-3.7.9/Modules/_ssl.c:2535
#12 _ssl__SSLSocket_read (self=0x7fad26a8e440, args=<optimized out>) at /tmp/python-build.20201030105347.4623/Python-3.7.9/Modules/clinic/_ssl.c.h:281
...

(gdb) py-list
 924            self._checkClosed()
 925            if self._sslobj is None:
 926                raise ValueError("Read on closed or unwrapped SSL socket.")
 927            try:
 928                if buffer is not None:
>929                    return self._sslobj.read(len, buffer)
 930                else:
 931                    return self._sslobj.read(len)
 932            except SSLError as x:
 933                if x.args[0] == SSL_ERROR_EOF and self.suppress_ragged_eofs:
 934                    if buffer is not None:

(gdb) py-bt
Traceback (most recent call first):
  File "/.../lib/python3.7/ssl.py", line 929, in read
    return self._sslobj.read(len, buffer)
  File "/.../lib/python3.7/ssl.py", line 1071, in recv_into
    return self.read(nbytes, buffer)
  File "/.../lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "/.../lib/python3.7/http/client.py", line 271, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/.../lib/python3.7/http/client.py", line 310, in begin
    version, status, reason = self._read_status()
  File "/.../lib/python3.7/http/client.py", line 1369, in getresponse
    response.begin()
  File "python-http-client.py", line 27, in <module>
    req = conn.getresponse()

(gdb) py-locals
self = <SSLSocket(_context=<SSLContext at remote 0x7fad27228280>, _session=None, _sslobj=<_ssl._SSLSocket at remote 0x7fad26a8e440>, server_side=False, server_hostname='<HOST>', do_handshake_on_connect=True, suppress_ragged_eofs=True, _connected=True) at remote 0x7fad26ade830>
len = 8192
buffer = <memoryview at remote 0x7fad26af8120>