bug: "no top level messages" crash on Zen email loops

[David Bremner]

Antoine Beaupré <anarcat at orangeseeds.org> writes:

> Hi!
>
> Here's a fun bug for you Xapian tricksters.
>
> Two emails attached make notmuch crash when trying to display the
> folder.
>
> $ notmuch show thread:0000000000000001
> Internal error: Thread 0000000000000001 has no toplevel messages.
>  (notmuch-show.c:1012)
>
> Those are the two messages:
>
> $ notmuch search --output messages  thread:0000000000000001
> id:9379QM5Z39_5aa86b134fcfb_174033fc97a2cb98c7198d_sprut at zendesk.com
> id:9379QM5Z39_5aa86b1350504_174eb3fc97a2cb98c71674_sprut at zendesk.com
>
> `notmuch show` on either messages crashes the same way:
>
> $ notmuch show id:9379QM5Z39_5aa86b1350504_174eb3fc97a2cb98c71674_sprut at zendesk.com
> Internal error: Thread 0000000000000001 has no toplevel messages.
>  (notmuch-show.c:1012)

I can't duplicate that part.  

>
> Note that displaying the messages weith `--format raw` doesn't crash, so
> it's really the thread structure that's broken. Obviously, emacs can't
> display the messages either and doesn't touch the unread tags when
> trying to load the message, which is to be expected I guess.
>
> Xapian is also unhappy with the database created by notmuch new:
>
> $ xapian-check gitlab/.notmuch/xapian/
> docdata:
> blocksize=8K items=1 firstunused=1 revision=7 levels=0 root=0
> B-tree checked okay
> docdata table structure checked OK
>
> termlist:
> blocksize=8K items=12 firstunused=4 revision=7 levels=0 root=3
> xapian-check: DatabaseError: 1 unused block(s) missing from the free list, first is 0

Surprisingly (to me), I can duplicate that, so that's something to
pursue.

d