This reproduces in trunk, 1.7.8.4, and 1.7.9.5. I suspect this has to do with a whitespace + no trailing newline issues. The patch was generated by 1.7.9.5. I mangled it by hand to get it to be small, but the initial crash happened on a large, real-world output of "git format-patch". Error messages: ~/GIT-AM-CRASH$ ../git/git am crashy.patch Applying: Git crash bug git: builtin/apply.c:2108: update_pre_post_images: Assertion `fixed_preimage.nr == preimage->nr' failed. /home/lesha/GIT-AM-CRASH/../git/git-am: line 811: 23819 Aborted git apply --index "$dotest/patch" Patch failed at 0001 Git crash bug The copy of the patch that failed is found in: /home/lesha/GIT-AM-CRASH/.git/rebase-apply/patch When you have resolved this problem, run "git am --resolved". If you prefer to skip this patch, run "git am --skip" instead. To restore the original branch and stop patching, run "git am --abort". Repro steps: mkdir GIT-AM-CRASH cd GIT-AM-CRASH # download files into this directory git init . mkdir -p meep/spork mv __init__.py meep/spork git add meep/spork/__init__.py git ci -am 'moo' git am crashy.patch Hope this helps! Alexey
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