[Dovecot] deliver assertion failure

[Jasper Bryant-Greene]

Deliver from latest 1.1 HG with sieve also from latest 1.1 HG is dying
with an assertion failure when it delivers to my mailbox. Other
mailboxes on the same system are unaffected, but I can read my mailbox
fine through IMAP.

Dovecot and sieve were compiled with -march=nocona -pipe -ggdb

I've commented out my entire sieve script and the problem still occurs.

file index-mail-headers.c: line 590 (index_mail_get_raw_headers): assertion failed: (ret != -1)
    - Last output repeated twice -

Raw backtrace:
    /usr/libexec/dovecot/deliver(i_syslog_panic_handler+0x2b) [0x493125]
 -> /usr/libexec/dovecot/deliver(i_fatal+0) [0x492b17]
 -> /usr/libexec/dovecot/deliver [0x44f7cf]
 -> /usr/libexec/dovecot/deliver(index_mail_get_first_header+0x30) [0x44fb9b]
 -> /usr/libexec/dovecot/deliver(mail_get_first_header+0x3a) [0x47ca3d]
 -> /usr/libexec/dovecot/deliver(deliver_get_return_address+0x21) [0x41453b]
 -> /usr/lib/dovecot/lda/lib90_cmusieve_plugin.so(cmu_sieve_run+0x14b) [0x2b3687f194a1]
 -> /usr/lib/dovecot/lda/lib90_cmusieve_plugin.so [0x2b3687f169ba]
 -> /usr/libexec/dovecot/deliver(main+0x8dc) [0x415c4d]
 -> /lib/libc.so.6(__libc_start_main+0xe3) [0x2b3687cf6533]
 -> /usr/libexec/dovecot/deliver [0x4137a9]

Jasper