"unpack failed: error Missing tree" when upload a new patch with just commit message changed(no file changed)

[Chunlin Zhang]

In one of my gerrit (version 2.8.5), this issue can be reproduced by upload a new patch to a same change, with just git commit message changed (no file changed compare to previous patch).

error like this:

$ git push sup master:refs/for/master

Counting objects: 1, done.

Writing objects: 100% (1/1), 255 bytes | 0 bytes/s, done.

Total 1 (delta 0), reused 0 (delta 0)

error: unpack failed: error Missing tree c6b72e000e033d6350c4b9400a292cd0842bc950

fatal: Unpack error, check server log

To sup:lib/shapps

 ! [remote rejected] master -> refs/for/master (n/a (unpacker error))

If I modify some file and amend to this patch,it will be OK to push:

$ git push sup master:refs/for/master

Counting objects: 37, done.

Delta compression using up to 8 threads.

Compressing objects: 100% (6/6), done.

Writing objects: 100% (6/6), 1.16 KiB | 0 bytes/s, done.

Total 6 (delta 4), reused 0 (delta 0)

remote: Resolving deltas: 100% (4/4)

remote: Processing changes: updated: 1, refs: 1, done    

To sup:lib/shapps

 * [new branch]      master -> refs/for/master

I remember I did this same action before with no error, this issue seem to come out after upgrade to 2.8.5

[Doug Kelly]

This sounds like another instance of https://code.google.com/p/gerrit/issues/detail?id=1582 (which has a workaround you could try as well).

--Doug 

[Chunlin Zhang]

OK,I will try to set receive.checkReferencedObjectsAreReachable = false first.

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