HELP!! "git push"error!

HELP!! "git push"error!

[Baoyin]

Hi, all

Git reports error when I did "git push", following is part of error message:

error: packfile ./objects/pack/
pack-54b383e85f2e93a2c2ed4bf439808ecebd23986a.pack cannot be accessed
error: packfile ./objects/pack/pack-
a2105c2321aaf311826fe8148d56528536a3e38a.pack cannot be accessed
error: refs/changes/87/6687/1 does not point to a valid object!
error: packfile ./objects/pack/pack-
ce47b0d7b5fba35cc7764bfce061e673a401d775.pack cannot be accessed
error: refs/changes/87/7987/3 does not point to a valid object!
error: packfile ./objects/pack/
pack-25c5e425895d1f9333aa02a1ee0050de4ede5189.pack cannot be accessed
error: refs/changes/87/8687/1 does not point to a valid object!
error: packfile ./objects/pack/
pack-6eaaf27b51be41b1301a0e921d6609d05304d9a3.pack cannot be accessed
error: refs/changes/87/8987/1 does not point to a valid object!
error: packfile ./objects/pack/
pack-2064289922b9f0f403262adb94ad932c2684639c.pack cannot be accessed
error: refs/changes/87/8987/2 does not point to a valid object!
...........

some error messages show that "error: refs/changes/87/8987/1 does not point to  
a valid object! ", but  refs/changes/87/8987/1 dose point to a valid commit 
"3cbba537". 
Then I did "git show 3cbba537", result is ok, no error. 
I don't know why there is conflict.

I also did "git fsck" on git server, git reports errors too, following is part 
of error message:

error: packfile ./objects/pack/pack-
 d8c9cd1bdfdd458b7a53977c3544a54a26de8d30.pack cannot be accessed
 missing tree e2aa6890223d9cc186b53764752bc3531650aa1f
 error: packfile ./objects/pack/
 pack-29df930a4d5cae218ecd1a1bed6b1a662dec3253.pack cannot be accessed
 error: packfile ./objects/pack/pack-
d8c9cd1bdfdd458b7a53977c3544a54a26de8d30.pack cannot be accessed
 broken link from commit 1fad8edbaf7651e924681550da36e29419910c00
 to tree e2aa6890223d9cc186b53764752bc3531650aa1f
 error: packfile ./objects/pack/pack-
f62ed9d45bd82e735758a2fa750e2432734383e5.pack cannot be accessed
 missing tree 53ad32be22811bf4c351b3ec911905bbda016346
error: packfile ./objects/pack/pack-
f0724f223ec7d0501dcb9d350304e893ec06fb4b.pack cannot be accessed
error: packfile ./objects/pack/pack-
d17aa5efdbed08d0a59ceefc942e31d43694dfb4.pack cannot be accessed
 error: packfile ./objects/pack/
 pack-04644913e5cb6c9663e54c9e7fd4385182a87b15.pack cannot be accessed
 missing tree 6eaf3d97dbd2ce915c9b3ba83d9810e052016b6b
error: packfile ./objects/pack/pack-
ac7c3cd6124f4329159da2358690d34ff0182bbc.pack cannot be accessed
 missing tree d3b0de15d4ff4484195ec7342a1ffdb3ba6ddfc0
 dangling tree 03b18cf447ca33bd2d8a3ff765db03a469c0007c
 error: packfile ./objects/pack/
 pack-63e3e1673dc7d59c5ff90615fbf82f10512284e4.pack cannot be accessed
 missing tree 25b1d39e3736ca5a2ea9b766b549c615a8d19f84

error message shows that some objects missing, but they do exist. what's the 
problem?????

PS. merge patches by gerrit is work, I just can not "git push" to remote 
repository directly. it's takes me too much time to maintain four branches  
by cherry-pick each patch to local, use “git-commit --amend” to modify and push 
to gerrit again.