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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) [0x7f3ccc...

...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...

...mmon_pvt_modseq = 140725975364904 require_full_resync = false error = MAIL_ERROR_NONE __FUNCTION__ = "dsync_brain_sync_mailbox_deinit" #6 0x000000000043adc6 in dsync_brain_slave_recv_mailbox (brain=brain at entry=0x20d2b48) at dsync-brain-mailbox.c:841 dsync_box = 0x20d0878 local_dsync_box = {mailbox_guid = "\344B\277\017j\022\271T\002\253\000\000\367\362\265", <incomplete sequence \346>, mailbox_lost = false, have_guids = true, have_save_guids = true, have_only_guid128 = false, uid_validity = 1497621508, uid_next = 10, messages_co...

using latest auto build didn't help. this happens only with a specific account. # doveadm -o imapc_user=----- at domain.com -o imapc_password=---- backup -u =----- at domain.com -R imapc: dsync(---- at domain.com): Panic: pool_data_stack_realloc(): stack frame changed dsync(---- at domain.com): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x4209a) [0xb762b09a] ->