‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Wednesday, April 10, 2019 9:14 PM, Aki Tuomi <aki.tu...@open-xchange.com> wrote:
> > On 10 April 2019 23:13 Laura Smith via dovecot dovecot@dovecot.org wrote: > > Sent with ProtonMail Secure Email. > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Wednesday, April 10, 2019 8:20 PM, Aki Tuomi aki.tu...@open-xchange.com > > wrote: > > > > > > On 10 April 2019 22:13 Laura Smith via dovecot dovecot@dovecot.org > > > > wrote: > > > > On Wednesday, April 10, 2019 7:57 PM, Aki Tuomi > > > > aki.tu...@open-xchange.com wrote: > > > > > > > > > > On 10 April 2019 21:26 Laura Smith via dovecot dovecot@dovecot.org > > > > > > wrote: > > > > > > ========================================================================== > > > > > > dsync(foo...@example.com): Error: imapc(foobar.example.com:993): > > > > > > dns_lookup(foobar.example.com) failed: > > > > > > read(/var/run/dovecot/dns-client) failed: read(size=512) failed: > > > > > > Connection reset by peer > > > > > > > > > > This is dovecot's internal dns-client, and something goes wrong when > > > > > talking to the service. > > > > > > > > > > > dsync(foo...@example.com): Error: Failed to initialize user: imapc: > > > > > > Login to foobar.example.com failed: Disconnected from server > > > > > > > > > > This is btw dsync service, not imap service. > > > > > > > > > > > === > > > > > > Initially I thought "oh no, not another AppArmor block". > > > > > > But then surely the second message would not appear if the DNS > > > > > > lookup was not successful ? > > > > > > Also "dig foobar.example.com" works fine. > > > > > > How should I be troubleshooting this ? And if it is still likely to > > > > > > be AppArmor, what is calling it ? "doveadm" itself or something > > > > > > else ? What does "/var/run/dovecot/dns-client" do and why doesn't > > > > > > dovecot use standard OS calls like everyone else ? > > > > > > > > > > Because the "standard OS call" is blocking and we would prefer it to > > > > > not block everything else. > > > > > > > > > > > So many questions ! > > > > > > > > > > Aki > > > > > > > > Thanks for your reply, but both those message are generated from a > > > > simple : > > > > doveadm -v -o mail_fsync=never backup -R -u foo...@example.com imapc: > > > > So I don't know what you mean about dsync service failing ? Surely the > > > > DNS lookup succeeded if the 'dsync service' failed due to remote > > > > disconnect ? > > > > I'm still none the wiser as to where to start looking for > > > > troubleshoting ? > > > > > > Did you check dovecot logs? Maybe there is something useful? > > > Aki > > > > Only the same old cryptic message about dns-client ? > > master: Fatal: execv(/usr/lib/dovecot/dns-client) failed: Permission denied > > Something prevents executing the dns-client binary. > > > master: Error: service(dns_client): command startup failed, throttling for > > 16 secs > > dns_client: Fatal: master: service(dns_client): child 14293 returned error > > 84 (exec() failed) > > Aki Yes but is it being called by doveadm directly or by some other dovecot program ? If I'm going to have to go down the AppArmor route, then I would prefer if you told me what was calling it instead of me having to un-necessarily spend time doing straces ! Also, should I be able to call dns-client directly myself ? (or is there a way to do so to enable testing ?) # /usr/lib/dovecot/dns-client Panic: BUG: No IOs or timeouts set. Not waiting for infinity. Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xd879e) [0x7f582c65f79e] -> /usr/lib64/dovecot/libdovecot.so.0(+0xd87e1) [0x7f582c65f7e1] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f582c5c9024] -> /usr/lib64/dovecot/libdovecot.so.0(+0xf045c) [0x7f582c67745c] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x36) [0x7f582c679e96] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x4c) [0x7f582c6786ec] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f582c678908] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f582c5ee203] -> /usr/lib/dovecot/dns-client(main+0x8d) [0x55866c96050d] -> /lib64/libc.so.6(__libc_start_main+0xea) [0x7f582c1edf4a] -> /usr/lib/dovecot/dns-client(_start+0x2a) [0x55866c96055a]
