Hi Peff,

Jeff King wrote:

> --- a/read-cache.c
> +++ b/read-cache.c
> @@ -1800,6 +1800,8 @@ int write_index(struct index_state *istate, int newfd)
>                       continue;
>               if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce))
>                       ce_smudge_racily_clean_entry(ce);
> +             if (is_null_sha1(ce->sha1))
> +                     return error("cache entry has null sha1: %s", ce->name);
>               if (ce_write_entry(&c, newfd, ce, previous_name) < 0)
>                       return -1;

Quick heads up: this is tripping for me in the "git am --abort"

  $ cd ~/src/linux
  $ git checkout v3.2.35
  $ git am -3sc /tmp/alsa-usb-audio-fix-missing-autopm-for-midi-input.patch 
  Applying: ALSA: usb-audio: Fix missing autopm for MIDI input
  Using index info to reconstruct a base tree...
  Falling back to patching base and 3-way merge...
  error: Your local changes to the following files would be overwritten by 
  Please, commit your changes or stash them before you can merge.
  Failed to merge in the changes.
  Patch failed at 0001 ALSA: usb-audio: Fix missing autopm for MIDI input
  When you have resolved this problem run "git am --resolved".
  If you would prefer to skip this patch, instead run "git am --skip".
  To restore the original branch and stop patching run "git am --abort".
  $ git am --abort
  error: cache entry has null sha1: sound/usb/midi.c
  fatal: unable to write new index file
  Unstaged changes after reset:
  M       sound/usb/midi.c

Reproducible using v1.8.1-rc3 and master.  Bisects to 4337b585 (do not
write null sha1s to on-disk index, 2012-07-28).  For comparison, older
gits produced

  $ git am --abort
  Unstaged changes after reset:
  M       sound/usb/midi.c

which is also not great but at least didn't involve any obviously
invalid behavior.  Known problem?

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