"fatal: index-pack failed" error is seen during git clone

We have a mirror of git repository on Linux. On the build machine (Linux/Solaris), sometimes the following error is seen during git clone:

fatal: pack is corrupted (SHA1 mismatch) fatal: index-pack failed

When I manually execute the command, it works fine. But in the nightly build, I see this error roughly once in 5-6 days. Is this issue related to openssl package? Before building git-1.7.1, I had set the lib path of openssl-0.9.8n in LD_LIBRARY_PATH.

Please help in fixing this issue. Thanks.