Possible bug with dogstatsd deadlock #834
Description
Describe the bug
Code is hanging on datadog's post_fork() function. Possibly https://github.com/DataDog/datadogpy/blob/master/datadog/dogstatsd/base.py#L976 ?
Expected behavior
Dogstatsd lib references not deadlocking
Environment and Versions (please complete the following information):
dogstatsd 0.49.1
Additional context
From our developers: the parent code is trying to spawn subprocesses, but it ultimately hangs
i.e snip of the code:
process = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
shell=True,
text=True,
preexec_fn=_set_pdeathsig(
signal.SIGTERM
), # ensure terminate subproc if this proc dies
)
def _set_pdeathsig(sig=signal.SIGTERM):
"""Return a callable that terminates the subprocess."""
libc = ctypes.CDLL("libc.so.6")
def callable():
return libc.prctl(1, sig)
return callable
Output of pyspy:
Thread 1733153 (idle): "Thread-52 (process_items)"
close_socket (datadog/dogstatsd/base.py:933)
post_fork (datadog/dogstatsd/base.py:1369)
post_fork (datadog/dogstatsd/base.py:120)
_execute_child (subprocess.py:1796)
__init__ (subprocess.py:971)
...
Output of strace
strace: Process 1733153 attached
futex(0x5644f988f040, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY