Hi, I was getting core dumps (bus error 7) with git 1.7.1 when doing a git checkout. I tried git fsck, and same thing. I got the same with precompiled rpms of 1.7.12, and with a locally compiled version of git 1.8.5. The simplest/quickest repro I got is using git-fsck. The stacktrace blames SHA1_Update in verify_packfile. Upon further investigation all the in/offsets/remaining seemed ok. I traced it to a 17mb packfile that gets an i/o error when attempting to read it past 13mb. It looks like it's xmmap'ing the file and passing that pointer to SHA1_Update(). I don't know why in some paths it gives an i/o error and in other paths it segfaults (I added the extra debug output to git-fsck). $ git fsck Checking pack-0ccb5ee4f60003a7ea47d6904633cce5973efa60.pack in: 0x7f9070507000 remain: 17345210 offset: 17345230 Bus error (core dumped) git verify-pack correctly shows the error, without a bus error. $ git verify-pack -v pack-0ccb5ee4f60003a7ea47d6904633cce5973efa60.pack fatal: read error on input: Input/output error pack-0ccb5ee4f60003a7ea47d6904633cce5973efa60.pack: bad Not sure what the right solution is without impacting perf, but it took me a while to track down and having an error message indicating the bad file would've been a great help. Amit -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html