Sysdump bugtool gathering can fail and not print the underlying error (exit code 137)

[joestringer]

Observed in a user environment:

$ cilium sysdump 
...
⚠️ cilium-bugtool-cilium-agent-qkgpx: failed to collect 'cilium-bugtool' output for "cilium-agent-qkgpx" in namespace "cilium": command terminated with exit code 137: 
⚠️ Please note that depending on your Cilium version and installation options, this may be expected
🗳 Compiling sysdump
✅ The sysdump has been saved to /home/work/cilium-sysdump/cilium-sysdump-20220725-162347.zip

Note that the bugtool failed with exit code 137, but then no error is printed so it is difficult to understand what happened.

[joestringer]

From some brief searching online, it appears that exit code 137 may indicate that the pod ran out of memory (hit memory limits) while performing the sysdump.