Small, 2-line change.

Ignore previous attempt to upload:
> git cl issue 0

> git cl upload
(enter short message)

Here are the last few lines before it hangs:

[D2017-07-27 08:58:38,907 12775 139994277750592 subprocess2.py] git branch -r
[D2017-07-27 08:58:38,931 12775 139994277750592 subprocess2.py] git rev-parse --verify refs/remotes/origin/master
[D2017-07-27 08:58:38,947 12775 139994277750592 subprocess2.py] git -c color.ui=never config --get branch.brlapi_taskscheduler.base
[D2017-07-27 08:58:38,956 12775 139994277750592 subprocess2.py] git -c color.ui=never config --get branch.brlapi_taskscheduler.base-upstream
[D2017-07-27 08:58:38,965 12775 139994277750592 subprocess2.py] git -c color.ui=never merge-base refs/remotes/origin/master brlapi_taskscheduler
[D2017-07-27 08:58:38,984 12775 139994277750592 subprocess2.py] git rev-parse HEAD:
[D2017-07-27 08:58:38,999 12775 139994277750592 subprocess2.py] git commit-tree cc454f5f590617b1cff4ecbd242be0520c1cdbe2 -p d482b4bc21a00db35ee1c9a29bb9f53cddcbdd93 -m TEST

Change-Id: Id7f196ba58d5e013c516e63266d47f9307e4d2d1
[D2017-07-27 08:58:39,021 12775 139994277750592 subprocess2.py] git rev-list d482b4bc21a00db35ee1c9a29bb9f53cddcbdd93..75c7451c6be31bed34f3219609486dc8b25c0252
[D2017-07-27 08:58:39,038 12775 139994277750592 subprocess2.py] git config remote.origin.url
[D2017-07-27 08:58:39,047 12775 139994277750592 subprocess2.py] git push https://chromium.googlesource.com/chromium/src.git 75c7451c6be31bed34f3219609486dc8b25c0252:refs/for/refs/heads/master%wip,m=Initial_upload


(About two minutes elapse...)

Then it succeeds:

remote: Replicating objects... done        
remote: Processing changes: new: 1, done            
remote: 
remote: New Changes:        
remote:   https://chromium-review.googlesource.com/589776 TEST        
remote: 
To https://chromium.googlesource.com/a/chromium/src.git
 * [new branch]                75c7451c6be31bed34f3219609486dc8b25c0252 -> refs/for/refs/heads/master%wip,m=Initial_upload
[D2017-07-27 09:01:08,358 12775 139994277750592 subprocess2.py] git config branch.brlapi_taskscheduler.gerritissue 589776
[D2017-07-27 09:01:08,372 12775 139994277750592 subprocess2.py] git config branch.brlapi_taskscheduler.gerritserver https://chromium-review.googlesource.com
[D2017-07-27 09:01:08,383 12775 139994277750592 subprocess2.py] git config branch.brlapi_taskscheduler.gerritsquashhash 75c7451c6be31bed34f3219609486dc8b25c0252
[D2017-07-27 09:01:08,398 12775 139994277750592 subprocess2.py] git config rietveld.cc
[D2017-07-27 09:01:08,407 12775 139994277750592 gerrit_util.py] POST https://chromium-review.googlesource.com/a/changes/589776/revisions/current/review
[D2017-07-27 09:01:08,407 12775 139994277750592 gerrit_util.py] Content-Type: application/json
[D2017-07-27 09:01:08,407 12775 139994277750592 gerrit_util.py] Authorization: HIDDEN
[D2017-07-27 09:01:08,407 12775 139994277750592 gerrit_util.py] {"reviewers": [{"reviewer": "aboxhall+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "aleventhal+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "chromium-apps-reviews@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "chromium-reviews@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "dmazzoni+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "dougt+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "dtseng+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "extensions-reviews@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "je_julie.kim@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "nektar+watch@chromium.org", "state": "CC", "notify": "NONE"}, {"reviewer": "yuzo+watch@chromium.org", "state": "CC", "notify": "NONE"}], "notify": "NONE"}
[D2017-07-27 09:01:11,552 12775 139994277750592 gerrit_util.py] got response 200 for POST https://chromium-review.googlesource.com/a/changes/589776/revisions/current/review
[D2017-07-27 09:01:11,555 12775 139994277750592 subprocess2.py] git rev-parse HEAD
[D2017-07-27 09:01:11,580 12775 139994277750592 subprocess2.py] git symbolic-ref HEAD
[D2017-07-27 09:01:11,592 12775 139994277750592 subprocess2.py] git config branch.brlapi_taskscheduler.last-upload-hash 8cbaf596cb5233c4c8e8caa585f8d658faf919ea
[D2017-07-27 09:01:11,607 12775 139994277750592 subprocess2.py] git config rietveld.run-post-upload-hook
[D2017-07-27 09:01:11,618 12775 139994277750592 git_cl.py] Failed running ['git', 'config', 'rietveld.run-post-upload-hook']