[Dovecot] Crash in v1.2.3: istream.c: assertion failed on line 99

[Timo Sirainen]

On Fri, 2009-08-14 at 16:38 +1000, Phillip Macey wrote:
> Maybe I can narrow it down to a particular email and then we
> can take it from there. 

Yeah, that would be good.

> * It seems to be an attribute of the destination folder. I can 
> successfully move the mail into a new (empty) folder. As soon
> as I try to move into that specific destination, it starts crashing.

It's most likely because of the caching decisions. You can use idxview
to get a list of them, e.g.

idxview ~/Maildir/.dest 
..

-- Cache fields --
 #  Name                                         Type Size Dec  Last used
 0: flags                                        bit     4 tmp  2009-08-13 12:20
 1: date.sent                                    fix     8 tmp  2009-08-07 18:22
 2: date.received                                fix     4 yes  2009-08-13 14:51
..
 8: hdr.FROM                                     hdr     - tmp  2009-08-13 18:37
..

If you duplicate the caching decisions, or at least add some caching
decisions, that might be enough to cause it to crash. You can add those
decisions simply by fetching that data. For example:

1 select mailbox
2 fetch 1 (body.peek[header.fields (from to)] bodystructure internaldate)

> * The other thing that I think is a pattern - using thunderbird, if I
> select all the emails in the folder (eg Ctrl-A) and try to move them -
> it crashes. If I hand select a smaller subset of the emails, they tend
> to move successfully. The smaller the number the more likely it would be
> successful. I tried to figure out if there was a point at which it
> stopped working - but it seemed like the number kept on getting smaller
> as I kept trying. By the end, I was not even able to move a single
> email without getting a crash 

Sounds like when destination mailbox got larger it got easier to crash?
Although I don't think that should have happened..

> (restarting dovecot did not change this -
> permanent storage? fluke?).

Restarting Dovecot rarely helps with anything. All state is stored in
index files.

> >> (gdb) p ret
> >> $4 = 15376

Wonder if this could also be wrong and caused by gdb being confused,
because -O2 was used. I don't see any way how this could happen with the
current code.
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