p4 is stuck when submitting

Question

I was trying to submit the Unreal Engine (250k files) to the depot via p4v, however, one day passed and it seemed like the submit was still doing some operations or was hung. To get more verbosity, I then used the p4 submit -c #number to commit via cli and I've realized that it got stuck on a pdb file.

add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Tasks.v12.0/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Tasks.v12.0.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Tasks.v12.0/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Tasks.v12.0.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Tasks.v4.0/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Tasks.v4.0.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Tasks.v4.0/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Tasks.v4.0.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.Core/14.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.Core.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.Core/14.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.Core.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.v12.0/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.v12.0.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.v12.0/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.v12.0.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.v4.0/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.v4.0.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build.Utilities.v4.0/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.Utilities.v4.0.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/12.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/14.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/14.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.Build/4.0.0.0__b03f5f7f11d50a3a/Microsoft.Build.pdb#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.CSharp/4.0.0.0__b03f5f7f11d50a3a/Microsoft.CSharp.dll#1
add //test/test/Engine/Binaries/ThirdParty/Mono/Mac/lib/mono/gac/Microsoft.CSharp/4.0.0.0__b03f5f7f11d50a3a/Microsoft.CSharp.pdb#1

Is there anything that is odd? How would I debug this?