hello. perhaps not related but relevant. in my situation (same error message) the root cause was a "2 bytes" empty message in the box "e-commerce" directory when Evolution starts a FETCH/PREVIEW :

while a gdb session on core file :

#21 0x000055d629ab5f8e in cmd_fetch (cmd=0x55d669274958) at ./src/imap/cmd-fetch.c:382 client = <optimized out> ctx = 0x55d669274ba8 args = 0x55d66927d200 next_arg = <optimized out> list_arg = 0x0 search_args = 0x0 qresync_args = {qresync_sample_seqset = 0x55d6692426d0, qresync_sample_uidset = 0x55d66929be60} messageset = 0x55d66927d370 "4764:4766,4409,2912:2917,103" send_vanished = <optimized out> ret = <optimized out>

faulting message UID 2912 : no headers, 2 byes size

(gdb) p mail->mail.mail.uid $2 = 2912 (gdb) p mail->mail.mail.box->vname $3 = 0x55d6692981f0 "e-commerce"

doveadm fetch -u <user>"hdr" mailbox e-commerce uid 2912 hdr:

doveadm fetch -u <user> "uid guid flags date.received size.physical" mailbox e-commerce uid 2912 uid: 2912 guid: d41d8cd98f00b204e9800998ecf8427e flags: Old date.received: 2020-07-17 00:05:34 size.physical: 2

basically, deleting the faulting message solved the issue. I've got the dovecot-sysreport available if needed

Regards

hello. perhaps not related but relevant. in my situation (same error message) the root cause was a "2 bytes" empty message in the box "e-commerce" directory when Evolution starts a FETCH/PREVIEW : while a gdb session on core file : #21 0x000055d629ab5f8e in cmd_fetch (cmd=0x55d669274958) at ./src/imap/cmd-fetch.c:382 client = <optimized out> ctx = 0x55d669274ba8 args = 0x55d66927d200 next_arg = <optimized out> list_arg = 0x0 search_args = 0x0 qresync_args = {qresync_sample_seqset = 0x55d6692426d0, qresync_sample_uidset = 0x55d66929be60} messageset = 0x55d66927d370 "4764:4766,4409,2912:2917,103" send_vanished = <optimized out> ret = <optimized out> faulting message UID 2912 : no headers, 2 byes size (gdb) p mail->mail.mail.uid $2 = 2912 (gdb) p mail->mail.mail.box->vname $3 = 0x55d6692981f0 "e-commerce" doveadm fetch -u <user>"hdr" mailbox e-commerce uid 2912 hdr: doveadm fetch -u <user> "uid guid flags date.received size.physical" mailbox e-commerce uid 2912 uid: 2912 guid: d41d8cd98f00b204e9800998ecf8427e flags: Old date.received: 2020-07-17 00:05:34 size.physical: 2 basically, deleting the faulting message solved the issue. I've got the dovecot-sysreport available if needed

Regards