having issues with pykd (pykd.DbgException: Call IDebugClient::GetOutputCallbacks failed HRESULT 0x80010107)

Question

I'm working with pykd and am able to connect it with my debugger (windbg) but for some reason I'm unable to process any command with pykd.dbgCommand not sure what the issue is as I've tried multiple methods to try and resolve the issue:

• Reinstall pydk + python
• tried on python2.7, python3.5, python3.8
• tried a different system + different debug session

when I tried to run the command on the windbg session it was able to produce the results but somehow it's now able to do that from python console.

pykd.dbgCommand("!analyze -v")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pykd.DbgException: Call IDebugClient::GetOutputCallbacks failed
HRESULT 0x80010107

any help would be appreciated.

thanks to everyone answering in advance.

Answer 1

I tried to run dbgCommand('!analyze -v') with three different dump from python REPL:

1. usermode native dump: OK
2. kernel mode dump: OK
3. managed app dump:

0:000> !py
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> dbgCommand('analyze -v')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
pykd.DbgException: Call IDebugControl::ExecuteWide failed
HRESULT 0x80040205

Then I run this script:

import pykd
a = pykd.dbgCommand('!analyze -v')
print(a)

this script works OK with all of these dump.

I believe there is a bug. I've opened an issue: https://githomelab.ru/pykd/pykd-ext/-/issues/15

Can you provide a dump which reproduce the bug to the pykd issues tracker.