Panic: file dsync-brain-mailbox.c: line 814 ...

[Sander Lepik]

Hi!

We have 2 servers replicating each other and after upgrade to 2.2.26.0
we are seeing this in the logs:

Primary server:

Nov 17 09:37:39 mailhost01 dovecot: dsync-server(user at domain.ee): Panic:
file dsync-brain-mailbox.c: line 814 (dsync_brain_slave_recv_mailbox):
assertion failed: (memcmp(dsync_box->mailbox_guid,
local_dsync_box.mailbox_guid, sizeof(dsync_box->mailbox_guid)) == 0)
Nov 17 09:37:39 mailhost01 dovecot: dsync-server(user at domain.ee): Error:
Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x9438e)
[0x7f3ccceb238e] -> /usr/lib/dovecot/libdovecot.so.0(+0x9447c)
[0x7f3ccceb247c] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0)
[0x7f3ccce4ba4e] ->
dovecot/doveadm-server(dsync_brain_slave_recv_mailbox+0x3d8)
[0x7f3ccd8f66f8] -> dovecot/doveadm-server(dsync_brain_run+0x650)
[0x7f3ccd8f4110] -> dovecot/doveadm-server(+0x4143b) [0x7f3ccd8f443b] ->
dovecot/doveadm-server(+0x5735f) [0x7f3ccd90a35f] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x4c) [0x7f3cccec6bdc]
-> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x10a)
[0x7f3cccec809a] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x25)
[0x7f3cccec6c65] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38)
[0x7f3cccec6e08] -> dovecot/doveadm-server(+0x26b99) [0x7f3ccd8d9b99] ->
dovecot/doveadm-server(+0x28efc) [0x7f3ccd8dbefc] ->
dovecot/doveadm-server(+0x3daba) [0x7f3ccd8f0aba] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x4c) [0x7f3cccec6bdc]
-> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x10a)
[0x7f3cccec809a] ->
/usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x25)
[0x7f3cccec6c65] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38)
[0x7f3cccec6e08] ->
/usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13)
[0x7f3ccce51f53] -> dovecot/doveadm-server(main+0x19f) [0x7f3ccd8ccdef]
-> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)
[0x7f3ccca94b45] -> dovecot/doveadm-server(+0x19ea6) [0x7f3ccd8ccea6]
Nov 17 09:37:39 mailhost01 dovecot: dsync-server(user at domain.ee): Fatal:
master: service(doveadm): child 42621 killed with signal 6 (core dumps
disabled)

Secondary server:

Nov 17 09:37:40 secondarymailhost01 dovecot:
dsync-local(user at domain.ee): Error: read(mailhost01.domeen.ee) failed:
EOF (last sent=mailbox, last recv=mailbox_state)

I'm guessing that it happens during automatic full resync, but that's
just guessing.

OS is Debian 8 (x86_64) and Dovecot is recompiled from Debian's unstable
repository.

-- 
Sander