Hi Aki!
Sorry. Here is the right output.

# gdb /usr/local/libexec/dovecot/imap /var/core/24491
GNU gdb (Debian 8.1-3) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/local/libexec/dovecot/imap...(no debugging symbols found)...done.
[New LWP 24491]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `dovecot/imap [jakob 213'.
Program terminated with signal SIGABRT, Aborted.
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51      ../sysdeps/unix/sysv/linux/raise.c: Datei oder Verzeichnis nicht gefunden.
(gdb) bt full
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
        set = {__val = {0, 140735982403592, 140035444961075, 2331576704, 12138802451775488, 140035444733018, 206158430240, 4096, 140735982403592, 94124639053616, 4096, 443744500087950336, 2389, 2380, 2381,
            94124639053616}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1 0x00007f5c8ac4e2f1 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x33580, sa_sigaction = 0x33580}, sa_mask = {__val = {2048, 140035446034307, 140035441399298, 140035443714067, 140035445631889, 140035441273723,
              140035445630673, 94124639049440, 443744500087950336, 512, 140035444801458, 140735982404016, 94124639049440, 140735982404016, 140035444801849, 94124639049440}}, sa_flags = -1964120006,
          sa_restorer = 0x5}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2 0x00007f5c8aee5daf in ?? () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#3 0x00007f5c8aee5eba in ?? () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#4 0x00007f5c8ae53fe8 in i_panic () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#5 0x00007f5c8b08b028 in ?? () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#6 0x00007f5c8b06272a in index_storage_mailbox_close () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#7 0x00007f5c8afe01aa in mailbox_close () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#8 0x00007f5c8abb7b80 in ?? () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#9 0x00007f5c8abb7d3b in virtual_backend_box_open () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#10 0x00007f5c8abbaf19 in virtual_storage_sync_init () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#11 0x00007f5c8afe26d1 in mailbox_sync_init () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#12 0x00007f5c8afe2787 in mailbox_sync () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#13 0x00007f5c8b060ed1 in index_storage_get_status () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#14 0x00007f5c8abb6ead in ?? () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#15 0x00007f5c8b044f83 in ?? () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#16 0x00007f5c8abd9602 in ?? () from /usr/local/lib/dovecot/lib20_fts_plugin.so
No symbol table info available.
#17 0x00007f5c8ae0e813 in ?? () from /usr/local/lib/dovecot/lib01_acl_plugin.so
No symbol table info available.
#18 0x00007f5c8afe2b91 in mailbox_get_status () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#19 0x00007f5c8abbab7b in virtual_storage_sync_init () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#20 0x00007f5c8afe26d1 in mailbox_sync_init () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#21 0x00007f5c8afe2787 in mailbox_sync () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#22 0x00007f5c8b060ed1 in index_storage_get_status () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#23 0x00007f5c8abb6ead in ?? () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
#24 0x00007f5c8b044f83 in ?? () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#25 0x00007f5c8abd9602 in ?? () from /usr/local/lib/dovecot/lib20_fts_plugin.so
No symbol table info available.
#26 0x00007f5c8ae0e813 in ?? () from /usr/local/lib/dovecot/lib01_acl_plugin.so
No symbol table info available.
#27 0x00007f5c8afe2b91 in mailbox_get_status () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#28 0x00007f5c8abbab7b in virtual_storage_sync_init () from /usr/local/lib/dovecot/lib20_virtual_plugin.so
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#29 0x00007f5c8afe26d1 in mailbox_sync_init () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#30 0x00007f5c8afe2787 in mailbox_sync () from /usr/local/lib/dovecot/libdovecot-storage.so.0
No symbol table info available.
#31 0x0000559b17308ace in cmd_select_full ()
No symbol table info available.
#32 0x0000559b17310384 in command_exec ()
No symbol table info available.
#33 0x0000559b1730e832 in ?? ()
No symbol table info available.
#34 0x0000559b1730e8cc in ?? ()
No symbol table info available.
#35 0x0000559b1730ecd5 in client_handle_input ()
No symbol table info available.
#36 0x0000559b1730f2f4 in client_input ()
No symbol table info available.
#37 0x00007f5c8aefe009 in io_loop_call_io () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#38 0x00007f5c8aeff8ce in io_loop_handler_run_internal () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#39 0x00007f5c8aefe10c in io_loop_handler_run () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#40 0x00007f5c8aefe318 in io_loop_run () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#41 0x00007f5c8ae78413 in master_service_run () from /usr/local/lib/dovecot/libdovecot.so.0
No symbol table info available.
#42 0x0000559b17300f81 in main ()
No symbol table info available.
(gdb) quit

Jakob

Am 25.07.2018 um 10:01 schrieb Aki Tuomi:

Try running gdb again with corrected path for imap binary

---
Aki Tuomi

Dovecot oy

-------- Original message --------

From: Jakobus Schürz <jakobus.schuerz@ebcont.com>

Date: 25/07/2018 10:46 (GMT+02:00)

To: dovecot@dovecot.org

Subject: Re: Panic: Leaked view for index - virtual mailbox

Hi Aki!

The config is in the attachment.

The output from gdb is this:

# gdb /usr/lib/dovecot/imap /var/core/24491
GNU gdb (Debian 8.1-3) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
/usr/lib/dovecot/imap: Datei oder Verzeichnis nicht gefunden.
[New LWP 24491]
Core was generated by `dovecot/imap [jakob 213'.
Program terminated with signal SIGABRT, Aborted.
#0 0x00007f5c8ac4cf3b in ?? ()
(gdb) bt full
#0 0x00007f5c8ac4cf3b in ?? ()
No symbol table info available.
#1 0x0000000000000000 in ?? ()
No symbol table info available.
(gdb) quit

And i have a complex setup for virtual mailboxes...

For Synoptic/AKTUELL it is:

# cat /var/mail/virtual/AKTUELL/dovecot-virtual
!Real/halbjahr
all

And for Real/halbjahr it is:

# cat /var/mail/real/halbjahr/dovecot-virtual
!Real/Alle
all younger 15768000

And for Real/Alle it is:

# cat /var/mail/real/Alle/dovecot-virtual
!INBOX
INBOX/*
-INBOX/Trash
-INBOX/Trash/*
-INBOX/Archives
-INBOX/Archives/*
-INBOX/Drafts
-INBOX/Drafts/*
-INBOX/Junk
-INBOX/Junk/*
-INBOX/SYSTEM
-INBOX/SYSTEM/*
all

jakob

Am 25.07.2018 um 09:11 schrieb Aki Tuomi:
> So the core file is not very useful...
>
> can you, instead, attach your doveconf -n and your virtual folder configurations and also
>
> gdb /usr/lib/dovecot/imap /path/to/core
> bt full
>
> Aki
>
>> On 25 July 2018 at 09:55 Jakobus Schürz <jakobus.schuerz@ebcont.com> wrote:
>>
>>
>> Hi Aki!
>>
>> This is debian buster, but a self-compiled dovecot from git!
>>
>> /usr/local/sbin/dovecot --version
>> 2.3.2.1 (0719df592)
>>
>> jakob
>>
>>
>> Am 25.07.2018 um 08:30 schrieb Aki Tuomi:
>>> And can you provide dovecot --version too, please.
>>>
>>> Aki
>>>
>>>> On 25 July 2018 at 09:18 Aki Tuomi <aki.tuomi@dovecot.fi> wrote:
>>>>
>>>>
>>>> Hi!
>>>>
>>>> Which debian release is this?
>>>>
>>>> Aki
>>>>
>>>>> On 25 July 2018 at 05:18 Jakobus Schürz <jakobus.schuerz@ebcont.com> wrote:
>>>>>
>>>>>
>>>>> Hi There!
>>>>>
>>>>> I run into this problem with virtual Mailboxes on release-2.3.2 (and
>>>>> also in master and in older versions of dovecot)
>>>>>
>>>>> I added the core-file.
>>>>>
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11292><rg2GZclxHaPAqADc>: Panic: Leaked view for index
>>>>> /var/lib/dovecot/db/indexes/Maildir/jakob/&ANY-BB/dovecot.index: Opened
>>>>> in index-storage.c:338
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11292><rg2GZclxHaPAqADc>: Error: Raw backtrace:
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(+0xcedf1) [0x7ffad9ac0df1] ->
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(+
>>>>> 0xceeba) [0x7ffad9ac0eba] ->
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7ffad9a2efe8] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xf7022)
>>>>> [0x7ffad9c66022] -> /usr/local/lib/dovecot/libdovecot-s
>>>>> torage.so.0(index_storage_mailbox_close+0x9a) [0x7ffad9c3d72a] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_close+0x1a)
>>>>> [0x7ffad9bbb1aa] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(+0xab80) [0
>>>>> x7ffad9792b80] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_backend_box_open+0x2b)
>>>>> [0x7ffad9792d3b] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_storage_sync_init+0x12a9)
>>>>> [0x7ffad9795f1
>>>>> 9] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51)
>>>>> [0x7ffad9bbd6d1] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37)
>>>>> [0x7ffad9bbd787] -> /usr/local/lib/dovecot/libdo
>>>>> vecot-storage.so.0(index_storage_get_status+0x31) [0x7ffad9c3bed1] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(+0x9ead) [0x7ffad9791ead]
>>>>> -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xb0f83) [0x7ffad
>>>>> 9c1ff83] -> /usr/local/lib/dovecot/lib20_fts_plugin.so(+0x10602)
>>>>> [0x7ffad97b4602] -> /usr/local/lib/dovecot/lib01_acl_plugin.so(+0xf813)
>>>>> [0x7ffad99e9813] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox
>>>>> _get_status+0x31) [0x7ffad9bbdb91] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_storage_sync_init+0xf0b)
>>>>> [0x7ffad9795b7b] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51) [0
>>>>> x7ffad9bbd6d1] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37)
>>>>> [0x7ffad9bbd787] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x31)
>>>>> [0x7ffad9c3bed1] -> /usr/loca
>>>>> l/lib/dovecot/lib20_virtual_plugin.so(+0x9ead) [0x7ffad9791ead] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xb0f83)
>>>>> [0x7ffad9c1ff83] -> /usr/local/lib/dovecot/lib20_fts_plugin.so(+0x10602)
>>>>> [0x7ffad97b460
>>>>> 2] -> /usr/local/lib/dovecot/lib01_acl_plugin.so(+0xf813)
>>>>> [0x7ffad99e9813] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x31)
>>>>> [0x7ffad9bbdb91] -> /usr/local/lib/dovecot/lib20_virtual_plug
>>>>> in.so(virtual_storage_sync_init+0xf0b) [0x7ffad9795b7b] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51)
>>>>> [0x7ffad9bbd6d1]
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11292><rg2GZclxHaPAqADc>: Fatal: master: service(imap):
>>>>> child 11292 killed with signal 6 (core dumped)
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: client in:
>>>>> AUTH        19        PLAIN        service=imap secured=tls
>>>>> session=9KKNZclxHqPAqADc lip=192.168.0.14        rip=192.168.0.2
>>>>> 20        lport=143        rport=41758
>>>>> local_name=aldebaran.xundeenergie.at
>>>>> ssl_cipher=ECDHE-RSA-AES128-GCM-SHA256 ssl_cipher_bits=128
>>>>> ssl_pfs=KxECDHE ssl_protocol=TLSv1.2
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: client passdb
>>>>> out: CONT        19
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: client in:
>>>>> CONT<hidden>
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug:
>>>>> passwd-file(jakob,192.168.0.220,<9KKNZclxHqPAqADc>): lookup: user=jakob
>>>>> file=/usr/local/etc/dovecot/users
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: client passdb
>>>>> out: OK        19        user=jakob
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: master in:
>>>>> REQUEST        2436366337        10570        19
>>>>> dd4c468bbfe617d4ef06a1b8ce6c111d        session_pid=11298 request_auth_token
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug:
>>>>> passwd-file(jakob,192.168.0.220,<9KKNZclxHqPAqADc>): lookup: user=jakob
>>>>> file=/usr/local/etc/dovecot/users
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: auth: Debug: master userdb
>>>>> out: USER        2436366337        jakob home=/var/mail/jakob
>>>>> acl_groups=home,admin auth_token=3ea3b630e131
>>>>> 3bf5beb0f26ff740450189f63e3e
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]: imap-login: Login:
>>>>> user=<jakob>, method=PLAIN, rip=192.168.0.220, lip=192.168.0.14,
>>>>> mpid=11298, TLS, session=<9KKNZclxHqPAqADc>
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11298><9KKNZclxHqPAqADc>: Panic: Leaked view for index
>>>>> /var/lib/dovecot/db/indexes/Maildir/jakob/&ANY-BB/dovecot.index: Opened
>>>>> in index-storage.c:338
>>>>> Jul 25 04:11:29 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11298><9KKNZclxHqPAqADc>: Error: Raw backtrace:
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(+0xcedf1) [0x7fbd982b2df1] ->
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(+
>>>>> 0xceeba) [0x7fbd982b2eba] ->
>>>>> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7fbd98220fe8] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xf7022)
>>>>> [0x7fbd98458022] -> /usr/local/lib/dovecot/libdovecot-s
>>>>> torage.so.0(index_storage_mailbox_close+0x9a) [0x7fbd9842f72a] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_close+0x1a)
>>>>> [0x7fbd983ad1aa] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(+0xab80) [0
>>>>> x7fbd97f84b80] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_backend_box_open+0x2b)
>>>>> [0x7fbd97f84d3b] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_storage_sync_init+0x12a9)
>>>>> [0x7fbd97f87f1
>>>>> 9] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51)
>>>>> [0x7fbd983af6d1] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37)
>>>>> [0x7fbd983af787] -> /usr/local/lib/dovecot/libdo
>>>>> vecot-storage.so.0(index_storage_get_status+0x31) [0x7fbd9842ded1] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(+0x9ead) [0x7fbd97f83ead]
>>>>> -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xb0f83) [0x7fbd9
>>>>> 8411f83] -> /usr/local/lib/dovecot/lib20_fts_plugin.so(+0x10602)
>>>>> [0x7fbd97fa6602] -> /usr/local/lib/dovecot/lib01_acl_plugin.so(+0xf813)
>>>>> [0x7fbd981db813] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox
>>>>> _get_status+0x31) [0x7fbd983afb91] ->
>>>>> /usr/local/lib/dovecot/lib20_virtual_plugin.so(virtual_storage_sync_init+0xf0b)
>>>>> [0x7fbd97f87b7b] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51) [0
>>>>> x7fbd983af6d1] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37)
>>>>> [0x7fbd983af787] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(index_storage_get_status+0x31)
>>>>> [0x7fbd9842ded1] -> /usr/loca
>>>>> l/lib/dovecot/lib20_virtual_plugin.so(+0x9ead) [0x7fbd97f83ead] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0xb0f83)
>>>>> [0x7fbd98411f83] -> /usr/local/lib/dovecot/lib20_fts_plugin.so(+0x10602)
>>>>> [0x7fbd97fa660
>>>>> 2] -> /usr/local/lib/dovecot/lib01_acl_plugin.so(+0xf813)
>>>>> [0x7fbd981db813] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_get_status+0x31)
>>>>> [0x7fbd983afb91] -> /usr/local/lib/dovecot/lib20_virtual_plug
>>>>> in.so(virtual_storage_sync_init+0xf0b) [0x7fbd97f87b7b] ->
>>>>> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x51)
>>>>> [0x7fbd983af6d1]
>>>>> Jul 25 04:11:30 aldebaran dovecot[10573]:
>>>>> imap(jakob)<11298><9KKNZclxHqPAqADc>: Fatal: master: service(imap):
>>>>> child 11298 killed with signal 6 (core dumped)
>>>>>
>>>>>
>>>>> jakob
>>>>>