[python] segfaults at Message.get_date
Dmitry Kurochkin
dmitry.kurochkin at gmail.com
Sun Jun 19 02:45:07 PDT 2011
Hi Sebastian, Patrick.
On Sat, 18 Jun 2011 12:30:01 +0200, Sebastian Spaeth <Sebastian at SSpaeth.de> wrote:
> On Fri, 17 Jun 2011 17:10:24 +0100, Patrick Totzke :
> > #0 0x006eb87d in Xapian::Document::Internal::get_value(unsigned int) const () from /usr/lib/sse2/libxapian.so.22
> > #1 0x006eb952 in Xapian::Document::get_value(unsigned int) const () from /usr/lib/sse2/libxapian.so.22
> > #2 0x00523963 in notmuch_message_get_date () from /usr/local/lib/libnotmuch.so.1
>
> One question, what type is libnotmuch really returning here? The code:
>
>
> time_t
> notmuch_message_get_date (notmuch_message_t *message)
> { ...
> return Xapian::sortable_unserialise (value);
> }
>
> But Xapian API says that sortable_unserialise() returns floating type "double"
>
> http://xapian.org/docs/apidoc/html/namespaceXapian.html#326fe2d6b0ee59ac9536f3960e8fd99b
> "Convert a string encoded using sortable_serialise back to a floating
> point number."
>
> But time_t is usually a (signed) long and not floating point. Obviously
> things have worked just fine so far, but is libnotmuch really returning
> the right type here? Sorry, I expose my total lack of basic C++ knowledge
> here...
>
Converting double to time_t does not look good. Notmuch converts
between time_t and double both when setting and getting the date. I
guess it should work good in most cases at least. Perhaps Carl knows
better that it is safe.
This is not relevant to the segfault. The failure happens in:
value = message->doc.get_value (NOTMUCH_VALUE_TIMESTAMP);
before conversion from double to time_t.
Sebastian, are you able to reproduce the issue? A python script that
triggers the bug, perhaps? I would look at this if I can reproduce the
problem.
Patrick, can you install debugging symbols for libxapian and get the
backtrace again? On Debian you need to install libxapian22-dbg.
Regards,
Dmitry
> Sebastian
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