Python interpreter crash on Windows 10 while printing processes username with another user logged in.

[KelSolaar]

Hi,

We are experiencing hard Python interpreter crash on Windows 10 and psutil 5.4.3 when printing processes username with another user logged. Basically I'm logged into the workstation and another user is also logged in on his account. The crash happens when trying to list the processes username the second time.

Here is the reproducible code:

import psutil


def list_processes_username():
    for pid in psutil.pids():
        if not psutil.pid_exists(pid):
            continue

        try:
            print(psutil.Process(pid).username())
        except psutil.AccessDenied:
            pass


print(list_processes_username())
print(list_processes_username())

Crash Dialog:

Current Windows version:

[KelSolaar]

By printing the PIDs and checking in the Task Manager I was able to confirm that it is when trying to access a process from the other user.

[giampaolo]

Shit...
What Python and Windows version is this?

[KelSolaar]

Python 2.7, Windows version is in the last screenshot of OP.

[giampaolo]

Python 2.7 32 or 64 bit?

[KelSolaar]

64bit! Sorry for not being specific. I need to double-check at work but very likely this one: https://www.python.org/ftp/python/2.7.14/python-2.7.14.amd64.msi

[giampaolo]

No worries. As expected, I cannot reproduce it. I tried with this with no luck:

import psutil

while 1:
    for p in psutil.process_iter():
        try:
            print(p.username())
        except psutil.AccessDenied:
            pass

Can you identify the PID causing the crash, run this script and paste the output?

from pprint import pprint as pp
import psutil
attrs = set(['num_ctx_switches', 'pid', 'memory_full_info', 'connections', 'cmdline', 'create_time', 'ionice', 'memory_maps', 'cpu_percent', 'ppid', 'cwd', 'nice', 'status', 'cpu_times', 'io_counters', 'memory_info', 'threads', 'open_files', 'num_threads', 'exe', 'name', 'cpu_affinity', 'memory_percent', 'environ'])
PID = 1283
pp(psutil.Process(PID).as_dict(attrs=attrs))

[KelSolaar]

Yeah, I'll try that at work, we might be able to provide a stack trace. I'll keep you posted.

[giampaolo]

New release is out. Can you please check whether this got fixed?

[KelSolaar]

Hi @giampaolo,

Sorry for the late reply, I was swamped at worked and this fell down the priority stack. I have some good news though, 5.4.6 fixed the issue for me, I could confirm it multiple times by switching the package versions, 5.4.5 crashes, 5.4.6 does not! Thanks a lot.

Cheers,

Thomas