A new Flyspray task has been opened.  Details are below. 

User who did this - Dean Scarff (dos) 

Attached to Project - awesome
Summary - awful.util.spawn crashes during startup, works fine afterwards
Task Type - Bug Report
Category - Core
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Normal
Reported Version - 3.4.15
Due in Version - Undecided
Due Date - Undecided
Details - This was reported independently in Debian and Ubuntu a while ago:

I can reproduce in 3.4.15-1ubuntu1.  This was definitely a regression (my 
rc.lua didn't change, I just upgraded awesome and probably some other packages).

Steps to reproduce:
1. In rc.lua:
2. Start awesome from GDM

Observed behaviour:
In .xsession-errors:
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  12 (X_ConfigureWindow)
  Resource id in failed request:  0x0
  Serial number of failed request:  595
  Current serial number in output stream:  596

Then awesome crashes.

If I replace "/bin/echo" with "/usr/bin/yes", the "yes" process can be observed 
still running.

Expected behaviour:
echo gets run.
Awesome doesn't crash.

If I remove the relevant awful.util.spawn call from my rc.lua, awesome doesn't 
crash on startup.  Then I can run awful.util.spawn("/bin/echo") from 
awesome-client fine.

(Obviously I don't actually want to run echo specifically, I'm actually running 
a script, but I'm using echo as en example here because it's an innocent and 
ubiquitous command for testing).

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