Hello Aki,
Thanks for the suggestion.  With this being set: "default_vsz_limit =
unlimited", I don't get the seg fault with doveadm anymore.
However, I now have :
      % sudo doveadm log errors
     Error: cmd log errors: net_connect_unix(/usr/local/var/run/dovecot/
     master) failed: Connection refused
      %
And when I look at the logs :
Apr 07 09:46:13 master: Panic: file ./time-util.h: line 40 (timeval_add_usecs):
assertion failed: (usecs >= 0)
Apr 07 09:46:13 master: Error: Raw backtrace: 0  
libdovecot.0.dylib                  0x000000010cbffa18 backtrace_append + 61 -
> 1   libdovecot.0.dylib                  0x000000010cbffb4c backtrace_get + 40
-> 2   libdovecot.0.dylib                  0x000000010cc0dfc5
default_fatal_finish + 64 -> 3   libdovecot.0.dylib                 
0x000000010cc0c9ac default_error_handler + 0 -> 4  
libdovecot.0.dylib                  0x000000010cc0c97e fatal_handler_real + 0 -
> 5   dovecot                             0x0000000104405cf8
master_fatal_callback + 231 -> 6   libdovecot.0.dylib                 
0x000000010cc0cb9e i_fatal + 0 -> 7   libdovecot.0.dylib                 
0x000000010cc2542b ioloop_iolist_add + 0 -> 8  
libdovecot.0.dylib                  0x000000010cc239c6 io_loop_handle_timeouts
+ 613 -> 9   libdovecot.0.dylib                  0x000000010cc25f34
io_loop_handler_run_internal + 203 -> 10  libdovecot.0.dylib                 
0x000000010cc2407b io_loop_handler_run + 223 -> 11 
libdovecot.0.dylib                  0x000000010cc23f5b io_loop_run + 81 -> 12 
libdovecot.0.dylib                  0x000000010cb8321e master_service_run + 24
-> 13  dovecot                             0x0000000104405609 main + 3097 -
> 14  dyld                                0x00000002044232cd start + 1805
Apr 07 09:46:13 log(78532): Warning: Killed with signal 15 (by pid=1 uid=0
code=unknown 0)
Apr 07 09:46:14 master: Warning: fd limit (ulimit -n) is lower than required
under max. load (256 < 2550), because of service anvil { client_limit }
Apr 07 09:46:14 master: Info: Dovecot v2.4.0 (daeb6bc59c) starting up for imap
(core dumps disabled)

I admit this is a bit obscure to me.  I hope this can help you help me.

Emmanuel

Le 03/04/2025 à 08:02, Aki Tuomi via dovecot a écrit :
          On 02/04/2025 19:21 EEST Emmanuel Bardet via dovecot
          <[email protected]> wrote:


          Hello there,


          First, thanks for the terrific job you're doing.
          Dovecot rocks!

          I installed some time ago Dovecot on my macbook with
          Homebrew, that was
          Dovecot v2.3.18.     I recently upgraded everything I
          installed with
          Homebrew to the latest which brought Dovecot to v2.4.0.
          I then modified
          my dovecot.conf file to make it work with this latest
          version but now, I
          constantly get a segmentation fault when I use any /dove/
          command :

     Can you try changing default_vsz_limit to unlimited instead?

     Aki

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