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Bug#262272: mutt: segfault while sorting mailbox



----- Forwarded message from Eric Warmenhoven <eric@xxxxxxxxxxxxxxx> -----

Subject: Bug#262272: mutt: segfault while sorting mailbox
Reply-To: Eric Warmenhoven <eric@xxxxxxxxxxxxxxx>, 262272@xxxxxxxxxxxxxxx
From: Eric Warmenhoven <eric@xxxxxxxxxxxxxxx>
To: Debian Bug Tracking System <262272@xxxxxxxxxxxxxxx>

Package: mutt
Version: 1.5.6-20040907+3
Followup-For: Bug #262272

This crash happens to me every day, probably three times a day. Finally
I got annoyed and built mutt from debian sources, and put gdb on it:

Loaded symbols for /usr/lib/gconv/ISO8859-1.so
#0  0x080a81fb in find_subject (ctx=0x81da410, cur=0x81fcb58)
    at thread.c:428
428           if (tmp != cur &&                    /* don't match the
same message */
(gdb) list
418
419       subjects = make_subject_list (cur, &date);
420
421       while (subjects)
422       {
423         hash = hash_string ((unsigned char *) subjects->data,
424                             ctx->subj_hash->nelem);
425         for (ptr = ctx->subj_hash->table[hash]; ptr; ptr = ptr->next)
426         {
427           tmp = ((HEADER *) ptr->data)->thread;
428           if (tmp != cur &&                    /* don't match the same 
message */
429               !tmp->fake_thread &&             /* don't match pseudo 
threads */
430               tmp->message->subject_changed && /* only match interesting 
replies */
431               !is_descendant (tmp, cur) &&     /* don't match in the same 
thread */
432               (date >= (option (OPTTHREADRECEIVED) ?
433                         tmp->message->received :
434                         tmp->message->date_sent)) &&
435               (!last ||
436                (option (OPTTHREADRECEIVED) ?
437                 (last->message->received < tmp->message->received) :
(gdb) print tmp
$4 = (THREAD *) 0x0
(gdb) bt
#0  0x080a81fb in find_subject (ctx=0x81da410, cur=0x81fcb58)
    at thread.c:428
#1  0x080a83ab in pseudo_threads (ctx=0x81da410) at thread.c:499
#2  0x080a8b67 in mutt_sort_threads (ctx=0x81da410, init=1)
    at thread.c:952
#3  0x080a6c3a in mutt_sort_headers (ctx=0x81da410, init=1)
    at sort.c:287
#4  0x080c8b29 in imap_expunge_mailbox (idata=0x81dbc68) at imap.c:236
#5  0x080c7c95 in imap_cmd_finish (idata=0x81dbc68) at command.c:267
#6  0x080c796a in imap_cmd_step (idata=0x81dbc68) at command.c:153
#7  0x080c7ba8 in imap_exec (idata=0x81dbc68, cmd=0x80e3e22 "EXPUNGE",
    flags=0) at command.c:206
#8  0x080ca097 in imap_sync_mailbox (ctx=0x81da410, expunge=1,
    index_hint=0x82171a8) at imap.c:1068
#9  0x08086739 in mx_sync_mailbox (ctx=0x81da410,
    index_hint=0xbfffdfdc) at mx.c:1210
#10 0x0806574a in mutt_index_menu () at curs_main.c:1030
#11 0x0807c020 in main (argc=1, argv=0xbfffedc4) at main.c:936

Then I went searching through the mutt bug reports and found this one,
so here I am.

Please let me know what else I can do to help. It's obviously a NULL
pointer dereference but I don't know enough about the data structures to
know whether that's the symptom of an even bigger problem. I'm rather
comfortable with gdb, and like I said, get this crash about every three
hours (nine hour work day, three times a day). It always dies with the
status line saying "Sorting mailbox..." and always only for IMAP
mailboxes. I only have one mailbox, period, and it's IMAP (the server is
actually Exchange).

Eric

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.4.20-8
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C)

Versions of packages mutt depends on:
ii  exim4-daemon-light [mail-tr 4.50-4       lightweight exim MTA (v4) daemon
ii  libc6                       2.3.2.ds1-20 GNU C Library: Shared libraries an
ii  libdb4.2                    4.2.52-18    Berkeley v4.2 Database Libraries [
ii  libgnutls11                 1.0.16-13    GNU TLS library - runtime library
ii  libidn11                    0.5.13-1.0   GNU libidn library, implementation
ii  libncursesw5                5.4-4        Shared libraries for terminal hand
ii  libsasl2                    2.1.19-1.5   Authentication abstraction library

-- no debconf information

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----- End forwarded message -----

-- 
ciao,
Marco