[Dovecot] imap core dumping on signal 10

Chris Hoogendyk hoogendyk at bio.umass.edu
Wed Jul 21 19:05:01 EEST 2010



Timo Sirainen wrote:
> On Tue, 2010-07-20 at 18:53 -0400, Chris Hoogendyk wrote:
>   
>> We are just trying to bring up a new server and chose to use Dovecot 
>> rather than the uw-imap from our previous servers. At this point I am 
>> just testing with some throw away accounts using squirrelmail. I can 
>> load my inbox, but then the imap connection is lost.
>>     
>
> This happens always? For all users?
>
>   
>> Program terminated with signal 10, Bus error.
>>     
>
> Signal 10 usually means unaligned memory access or accessing mmap()ed
> file past the end of file.
>
>   
>> #0  0x000aa19c in mail_index_map (index=0x489, type=0) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-index//mail-index-map.c:502
>> 502                     map->hdr = *hdr;
>>     
> ..
>   
>>         hdr = (const struct mail_index_header *) 0x8000000
>>     
>
> This hdr alignment looks ok. Also I can't really figure out from the
> code how it could be crashing here. And -O2 has optimized the backtrace
> and some variables in a way that it's a bit difficult to figure out
> what's actually going on.
>
> Could you compile without -O2 (but I think -O is required or it won't
> crash)? Easiest way would be to do something like:
>
> 1. cd src/lib-index/Makefile
> 2. Change -O2 to -O in Makefile
> 3. make clean && make
> 4. cd ../imap && make && make install
>
> Then it would be helpful to know at least the output of:
>
> bt full
> p hdr
> p *hdr
> p &map->hdr
> p *map->rec_map

OK. Steps 1-4 completed without any problems.

Does it happen with all users? We are just in the development, immediate 
pre-transition stage. We had hoped to bring the server up early this 
week. At the moment, I only have a couple of users we are playing with. 
I used my account with only a minimal amount in /var/mail/chrisho based 
on playing on this machine. Then I copied my /var/mail from the server 
we are going to replace. It is substantially larger, but I have no 
trouble with it using uw-imap on that server. I placed it on this 
server, did an `rm -r ~chrisho/mail` to give a clean start on that, and 
then connected with squirrelmail. I've repeated this same process, back 
and forth. Interesting thing is that when I did it this morning, after 
the steps 1-4 above, I was clicking all over in squirrelmail with my 
smaller /var/mail/chrisho and couldn't cause any errors. Then I logged 
out, swapped in the larger /var/mail/chrisho, rm'd ~chrisho/mail, and 
reconnected with squirrelmail. It brought up my inbox without any 
errors. However, when I clicked on a message, it core dumped.

gdb output is below.


-- 
---------------

Chris Hoogendyk

-
   O__  ---- Systems Administrator
  c/ /'_ --- Biology & Geology Departments
 (*) \(*) -- 140 Morrill Science Center
~~~~~~~~~~ - University of Massachusetts, Amherst 

<hoogendyk at bio.umass.edu>

--------------- 

Erdös 4


-----------------------------------------------------------------------------------------
following is the dovecot.log just for the final session with the larger /var/mail/chrisho
-----------------------------------------------------------------------------------------


Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): client in: AUTH        1       PLAIN   service=imap    secured lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=61462     resp=AGNocmlzaG8AMG5XMHJEPyE=
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): shadow(chrisho,127.0.0.1): lookup
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): client out: OK 1       user=chrisho
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): master in: REQUEST     20      1570    1
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): passwd(chrisho,127.0.0.1): lookup
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): master out: USER       20      chrisho system_groups_user=chrisho      uid=2295        gid=102 home=/u1/home/bio/hoogendyk
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] imap-login: Login: user=<chrisho>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Effective uid=2295, gid=102, home=/u1/home/bio/hoogendyk
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): mbox: data=~/mail:INBOX=/var/mail/chrisho
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): fs: root=/u1/home/bio/hoogendyk/mail, index=, control=, inbox=/var/mail/chrisho
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Disconnected: Logged out bytes=44/697
Jul 21 11:43:08 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1641
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): client in: AUTH        1       PLAIN   service=imap    secured lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=61464     resp=AGNocmlzaG8AMG5XMHJEPyE=
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): shadow(chrisho,127.0.0.1): lookup
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): client out: OK 1       user=chrisho
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): master in: REQUEST     21      1572    1
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): passwd(chrisho,127.0.0.1): lookup
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): master out: USER       21      chrisho system_groups_user=chrisho      uid=2295        gid=102 home=/u1/home/bio/hoogendyk
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] imap-login: Login: user=<chrisho>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Effective uid=2295, gid=102, home=/u1/home/bio/hoogendyk
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): mbox: data=~/mail:INBOX=/var/mail/chrisho
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): fs: root=/u1/home/bio/hoogendyk/mail, index=, control=, inbox=/var/mail/chrisho
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Namespace : Using permissions from /u1/home/bio/hoogendyk/mail: mode=0700 gid=-1
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.error] IMAP(chrisho): chown(/u1/home/bio/hoogendyk/mail/.imap/INBOX, -1, 6(mail)) failed: Operation not permitted (egid=102(biostaff), group based on /var/mail/chrisho)
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.error] IMAP(chrisho): mkdir(/u1/home/bio/hoogendyk/mail/.imap/INBOX) failed: Not owner
Jul 21 11:43:09 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1643
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Disconnected: Logged out bytes=386/1304
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): client in: AUTH        1       PLAIN   service=imap    secured lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=61467     resp=AGNocmlzaG8AMG5XMHJEPyE=
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): shadow(chrisho,127.0.0.1): lookup
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): client out: OK 1       user=chrisho
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): master in: REQUEST     22      1641    1
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): passwd(chrisho,127.0.0.1): lookup
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): master out: USER       22      chrisho system_groups_user=chrisho      uid=2295        gid=102 home=/u1/home/bio/hoogendyk
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] imap-login: Login: user=<chrisho>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Effective uid=2295, gid=102, home=/u1/home/bio/hoogendyk
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): mbox: data=~/mail:INBOX=/var/mail/chrisho
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): fs: root=/u1/home/bio/hoogendyk/mail, index=, control=, inbox=/var/mail/chrisho
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.error] IMAP(chrisho): fchown(/u1/home/bio/hoogendyk/mail/.imap/INBOX/dovecot.index.log.newlock, -1, 6(mail)) failed: Operation not permitted (egid=102(biostaff), group based on /var/mail/chrisho)
Jul 21 11:43:10 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1645
Jul 21 11:43:11 imladris dovecot: [ID 583609 local2.error] IMAP(chrisho): fchown(/u1/home/bio/hoogendyk/mail/.imap/INBOX/dovecot.index.tmp, -1, 6(mail)) failed: Operation not permitted (egid=102(biostaff), group based on /var/mail/chrisho)
Jul 21 11:43:11 imladris dovecot: [ID 583609 local2.error] IMAP(chrisho): fchown(/u1/home/bio/hoogendyk/mail/.imap/INBOX/dovecot.index.cache.lock, -1, 6(mail)) failed: Operation not permitted (egid=102(biostaff), group based on /var/mail/chrisho)
Jul 21 11:43:11 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Disconnected: Logged out bytes=351/16932
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): client in: AUTH        1       PLAIN   service=imap    secured lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=61520     resp=AGNocmlzaG8AMG5XMHJEPyE=
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): shadow(chrisho,127.0.0.1): lookup
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): client out: OK 1       user=chrisho
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): master in: REQUEST     23      1643    1
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): passwd(chrisho,127.0.0.1): lookup
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): master out: USER       23      chrisho system_groups_user=chrisho      uid=2295        gid=102 home=/u1/home/bio/hoogendyk
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] imap-login: Login: user=<chrisho>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Effective uid=2295, gid=102, home=/u1/home/bio/hoogendyk
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): mbox: data=~/mail:INBOX=/var/mail/chrisho
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): fs: root=/u1/home/bio/hoogendyk/mail, index=, control=, inbox=/var/mail/chrisho
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1668
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.error] dovecot: child 1667 (imap) killed with signal 10 (core dumped)
Jul 21 11:43:45 imladris dovecot: [ID 583609 local2.warning] dovecot: Killed with signal 15 (by pid=1669 uid=0 code=kill)
Jul 21 11:43:46 imladris dovecot: [ID 583609 local2.info] Dovecot v1.2.12 starting up
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1681
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1682
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1683
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1685
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1684
Jul 21 11:43:47 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1686
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): client in: AUTH        1       PLAIN   service=imap    secured lip=127.0.0.1   rip=127.0.0.1   lport=993       rport=62350     resp=AGNocmlzaG8AMG5XMHJEPyE=
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): shadow(chrisho,127.0.0.1): lookup
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): client out: OK 1       user=chrisho
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): master in: REQUEST     1       1685    1
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): passwd(chrisho,127.0.0.1): lookup
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] auth(default): master out: USER       1       chrisho system_groups_user=chrisho      uid=2295        gid=102 home=/u1/home/bio/hoogendyk
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] imap-login: Login: user=<chrisho>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, TLS
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): Effective uid=2295, gid=102, home=/u1/home/bio/hoogendyk
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): mbox: data=~/mail:INBOX=/var/mail/chrisho
Jul 21 11:53:10 imladris dovecot: [ID 583609 local2.info] IMAP(chrisho): fs: root=/u1/home/bio/hoogendyk/mail, index=, control=, inbox=/var/mail/chrisho
Jul 21 11:53:11 imladris dovecot: [ID 583609 local2.info] auth(default): new auth connection: pid=1865
Jul 21 11:53:11 imladris dovecot: [ID 583609 local2.error] dovecot: child 1864 (imap) killed with signal 10 (core dumped)
Jul 21 11:53:11 imladris dovecot: [ID 583609 local2.warning] dovecot: Killed with signal 15 (by pid=1866 uid=0 code=kill)
Jul 21 11:53:11 imladris dovecot: [ID 583609 local2.info] Dovecot v1.2.12 starting up



---------------------------------------------
following is the gdb output for that coredump
---------------------------------------------

imladris:/var/core# gdb /usr/local/libexec/dovecot/imap core_imladris_imap_2295_102_1279727025_1667

GNU gdb 6.6
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "sparc-sun-solaris2.10"...
Reading symbols from /opt/coolstack/lib/libiconv.so.2...done.
Loaded symbols for /opt/coolstack/lib/libiconv.so.2
Reading symbols from /usr/lib/libnsl.so.1...done.
Loaded symbols for /usr/lib/libnsl.so.1
Reading symbols from /usr/lib/libsocket.so.1...done.
Loaded symbols for /usr/lib/libsocket.so.1
Reading symbols from /usr/lib/librt.so.1...done.
Loaded symbols for /usr/lib/librt.so.1
Reading symbols from /usr/lib/libsendfile.so.1...done.
Loaded symbols for /usr/lib/libsendfile.so.1
Reading symbols from /usr/lib/libc.so.1...done.
Loaded symbols for /usr/lib/libc.so.1
Reading symbols from /lib/libaio.so.1...done.
Loaded symbols for /lib/libaio.so.1
Reading symbols from /lib/libmd.so.1...done.
Loaded symbols for /lib/libmd.so.1
Reading symbols from /platform/sun4v/lib/libc_psr.so.1...done.
Loaded symbols for /platform/SUNW,SPARC-Enterprise-T5220/lib/libc_psr.so.1
Reading symbols from /lib/ld.so.1...done.
Loaded symbols for /lib/ld.so.1
Core was generated by `imap'.
Program terminated with signal 10, Bus error.
#0  0x000aa19c in mail_index_map (index=0x489, type=0) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-index//mail-index-map.c:502
502                     map->hdr = *hdr;

(gdb) bt full

#0  0x000aa19c in mail_index_map (index=0x489, type=0) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-index//mail-index-map.c:502
        ret = 2
        old_map = (struct mail_index_map *) 0x162338
        new_map = (struct mail_index_map *) 0x162338
        st = {st_dev = 8388615, st_pad1 = {0, 0, 0}, st_ino = 30376, st_mode = 33152, st_nlink = 1, st_uid = 2295, st_gid = 102, st_rdev = 0, 
  st_pad2 = {0, 0}, st_size = 18736, st_atim = {tv_sec = 1279726991, tv_nsec = 345785000}, st_mtim = {tv_sec = 1279726991, tv_nsec = 346718000}, 
  st_ctim = {tv_sec = 1279726991, tv_nsec = 372338000}, st_blksize = 8192, st_blocks = 38, st_fstype = "ufs", '\0' <repeats 12 times>, st_pad4 = {0, 
    0, 0, 0, 0, 0, 0, 0}}
        lock_id = 4
        file_size = 9223434923765923840
        use_mmap = 48
        unusable = 52
        ret = 112
        try = 0
        _data_stack_cur_id = 4282335512
        index = (struct mail_index *) 0x489
        ext_hdr = (const struct mail_index_ext_header *) 0x0
        i = 1450816
        old_count = 187472
        offset = 0
        name = 0x70 <Address 0x70 out of bounds>
        error = 0x7fffffff <Address 0x7fffffff out of bounds>
        ext_id = 1177832
        ext_offset = 1450992
        index = (struct mail_index *) 0x70
        rec_map = (struct mail_index_record_map *) 0xa0
        hdr = (const struct mail_index_header *) 0x0
        index = (struct mail_index *) 0x1606d0
        handlers = (mail_index_sync_lost_handler_t * const *) 0x0
        st = {st_dev = 0, st_pad1 = {0, 0, 0}, st_ino = 0, st_mode = 0, st_nlink = 0, st_uid = 0, st_gid = 0, st_rdev = 0, st_pad2 = {0, 0}, 
  st_size = 0, st_atim = {tv_sec = 0, tv_nsec = 0}, st_mtim = {tv_sec = 0, tv_nsec = 0}, st_ctim = {tv_sec = 0, tv_nsec = 0}, st_blksize = 0, 
  st_blocks = 0, st_fstype = '\0' <repeats 15 times>, st_pad4 = {0, 0, 0, 0, 0, 0, 0, 0}}
        i = 4290764852
        count = 1161
        ret = 1452352
        try_retry = 160
        retry = 222
        index = (struct mail_index *) 0x1606d0
        hdr = (const struct mail_index_header *) 0x8000000
        read_buf = "\a\002\000x\000\000\000?\000\000\000\020\000\000\000\000LG\025\216\000\000\000\000K?!?\000\002??\000\000\004\211\000\000\000\000\000\000\004\211\000\000\000\000\000\002??\000\002??\000\000\000\000\000\000\000\002\000\000[?\000\000[?", '\0' <repeats 12 times>, "LFp?\000\002??", '\0' <repeats 31 times>, "\020\000\000\000\000\000\b\000\b\000\b\000\004mbox\000\000\000\000\000\000\000\000\000?o5LE?/\000\000\000\000\000\002??\b\000\000\000\000\000\000\000\000\000\002\032\000\002??\b\000\000\000\000\000\000\000\000\000\020V\000\002??\b\000\000\000\000\000\000\000\000\000#\237\000\002??\b\000\000\000\000\000\000\000\000\000F"...
        buf = (const void *) 0x0
        data = (void *) 0x0
        ret = -4202444
        pos = 1161
        records_size = 14640
        initial_buf_pos = 1450992
        records_count = 1161
        extra = 3936
        pos = 1161
        ret = -4202444
#1  0x000a5adc in mail_index_try_open (index=0x160820) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-index//mail-index.c:300
        ret = -1
#2  0x000a5fb0 in mail_index_open (index=0x8a040, flags=17, lock_method=FILE_LOCK_METHOD_DOTLOCK)
    at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-index//mail-index.c:365
        ret = 1969648384
        ret = 1443536
        created = false
#3  0x00089c34 in index_storage_mailbox_open (ibox=0x600) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-storage/index//index-storage.c:406
        storage = (struct mail_storage *) 0x15ad18
        index_flags = 17
        ret = 565312
        cache = (struct mail_cache *) 0x0
        cache_env = 0x0
        never_env = 0x4000000 <Address 0x4000000 out of bounds>
        env = 0x100001 ""
---Type <return> to continue, or q <return> to quit---
#4  0x0008a134 in index_storage_mailbox_init (ibox=0x0, name=0x0, flags=0, move_to_memory=false)
    at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-storage/index//index-storage.c:475
        storage = (struct mail_storage *) 0x11
        box = (struct mailbox *) 0x0
        dir_gid = 6
        origin = 0x15b140 "/var/mail/chrisho"
        dir_origin = 0x15b140 "/var/mail/chrisho"
        buffer = (buffer_t *) 0x0
        buffer = (buffer_t *) 0x1615c8
#5  0x00064ad8 in mbox_alloc_mailbox (storage=0x3164c, index=0x1606d0, name=0x11f8e8 "INBOX", path=0x15b140 "/var/mail/chrisho", flags=0)
    at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-storage/index/mbox//mbox-storage.c:608
        mbox = (struct mbox_mailbox *) 0x0
        pool = (pool_t) 0x0
        env = 0xffea0950 <Address 0xffea0950 out of bounds>
        st = {st_dev = 0, st_pad1 = {0, 1374345, -4197136}, st_ino = 0, st_mode = 0, st_nlink = 0, st_uid = 16, st_gid = 1, st_rdev = 4290769628, 
  st_pad2 = {-13172344, -4196616}, st_size = 1007998744081760, st_atim = {tv_sec = -15531076, tv_nsec = -1431216}, st_mtim = {tv_sec = 1431216, 
    tv_nsec = -1431216}, st_ctim = {tv_sec = -1431216, tv_nsec = 1431216}, st_blksize = 1, st_blocks = 4279457448, 
  st_fstype = "\000\025ְ\000\a?|\000\025ְ?7*", st_pad4 = {-15531076, -1447600, 1447600, -1439408, -1439408, 1439408, 1, -15489704}}
        min_size = 4282335320
#6  0x00066628 in mbox_open (storage=0x15af28, name=0x11f8e8 "INBOX", flags=0)
    at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-storage/index/mbox//mbox-storage.c:626
        _storage = (struct mail_storage *) 0x0
        mbox = (struct mbox_mailbox *) 0x0
        index = (struct mail_index *) 0x0
        path = 0x0
        rootdir = 0x0
#7  0x0009863c in mailbox_open (_storage=0xff1392e4, name=0x124b08 "INBOX", input=0x0, flags=0)
    at /usr/local/src/dovecot/dovecot-1.2.12/src/lib-storage//mail-storage.c:478
        storage = (struct mail_storage *) 0x15ad18
        box = (struct mailbox *) 0x124b08
#8  0x0002be9c in cmd_select_full (cmd=0x0, readonly=false) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//cmd-select.c:261
        client = (struct client *) 0x15b400
        box = (struct mailbox *) 0x1be8b
        ctx = (struct imap_select_context *) 0xffbff318
        args = (const struct imap_arg *) 0x15df10
        mailbox = 0x124b08 "INBOX"
        ret = 0
        name = 0x0
        seqset = {arr = {buffer = 0x0, element_size = 0}, v = 0x0, v_modifiable = 0x0}
        uidset = {arr = {buffer = 0x99b88f8, element_size = 240}, v = 0x99b88f8, v_modifiable = 0x99b88f8}
        count = 1
        buffer = (buffer_t *) 0x15ad18
        buffer = (buffer_t *) 0x15ad18
        buffer = (buffer_t *) 0xff1303bc
        buffer = (buffer_t *) 0x10
        seq_range = (const struct seq_range *) 0x0
        uid_range = (const struct seq_range *) 0x0
        seq_iter = {array = 0x0, prev_n = 0, prev_idx = 4096}
        i = 2147483648
        seq_count = 10240
        uid_count = 1422984
        diff = 2147498290
        n = 10048
        seq = 1366052
        buffer = (buffer_t *) 0x15ad18
        buffer = (buffer_t *) 0x15ad18
        client = (struct client *) 0x15b400
        status = {messages = 1366064, recent = 1366052, unseen = 0, uidvalidity = 0, uidnext = 0, first_unseen_seq = 0, highest_modseq = 0, 
  keywords = 0x0, sync_delayed_expunges = 0, nonpermanent_modseqs = 0}
        open_flags = 0
        fetch_ctx = (struct imap_fetch_context *) 0x0
        search_args = (struct mail_search_args *) 0x0
#9  0x0002c3b0 in cmd_select (cmd=0xfa2bc) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//cmd-select.c:388
No locals.
#10 0x0002ef20 in client_command_input (cmd=0x6) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//client.c:612
        client = (struct client *) 0x15b400
        command = (struct command *) 0x80000000
#11 0x0002f190 in client_command_input (cmd=0x15b688) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//client.c:661
        client = (struct client *) 0x15b400
---Type <return> to continue, or q <return> to quit---
        command = (struct command *) 0x14f940
#12 0x0002f8b4 in client_handle_input (client=0x80000000) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//client.c:458
        ret = false
        remove_io = false
        handled_commands = false
#13 0x000303e4 in client_input (client=0x0) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//client.c:753
        cmd = (struct client_command_context *) 0x707
        output = (struct ostream *) 0x15b600
        bytes = 21
#14 0x000fc2e8 in io_loop_handler_run (ioloop=0x0) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib//ioloop-poll.c:203
        ctx = (struct ioloop_handler_context *) 0x159318
        pollfd = (struct pollfd *) 0x159b28
        tv = {tv_sec = 1799, tv_usec = 999269}
        io = (struct io_file *) 0x158488
        t_id = 2
        msecs = 288
        ret = 1
        call = true
#15 0x000fb680 in io_loop_run (ioloop=0xffbff9fe) at /usr/local/src/dovecot/dovecot-1.2.12/src/lib//ioloop.c:335
No locals.
#16 0x0003c190 in main (argc=0, argv=0x1, envp=0x0) at /usr/local/src/dovecot/dovecot-1.2.12/src/imap//main.c:327
        version = 0x80000000 <Address 0x80000000 out of bounds>
        plugin_dir = 0x14f400 ""
        user = 0x3b800 "\232 "
        env = 0xffbff7c8 ""
        client = (struct client *) 0x14f400
        output = (struct ostream *) 0x158280
        user = (struct mail_user *) 0x1
        username = 0xffbff9fe "A001"
        home = 0x14d800 ""
        str = 0x15a6c8 ""
        tag = 0x14f400 ""
        _data_stack_cur_id = 0
        buf = (buffer_t *) 0x15b400
        list = (struct client_workaround_list *) 0x1
        env = 0x5 <Address 0x5 out of bounds>
        str = (const char * const *) 0x14f730

(gdb) p hdr

$1 = (const struct mail_index_header *) 0x0

(gdb) p *hdr

Cannot access memory at address 0x0

(gdb) p &map->hdr

No symbol "map" in current context.

(gdb) p *map->rec_map

No symbol "map" in current context.

(gdb) p &imap->hdr

No symbol "imap" in current context.

(gdb) 


----------------------------
and that's all there is here
----------------------------




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