Lmtp Memory Limit

[Aki Tuomi]

On 14.01.2018 09:11, Thomas Manninger wrote:
> Hi,
>  
> i am using dovecot 2.2.33.2 on CentOS 7.4.
>  
> Since i upgraded from CentOS 7.2. to CentOS 7.4. (without upgrading dovecot), my dovecot sieve-pipe scripts crash with Out of memory:
> Out of memory (allocated 262144) (tried to allocate 8793 bytes)
>  
> There are some memory limits in dovecot or sieve? Can i change this value?
>  
> Kernel limitks:
> [root at xxx software]# ulimit -a
> core file size          (blocks, -c) 0
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 26505
> max locked memory       (kbytes, -l) 64
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 8192
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 26505
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited
>  
>  
> Dovecot is running as user mail:
>  su mail
> bash-4.2$ ulimit -a
> core file size          (blocks, -c) 0
> data seg size           (kbytes, -d) unlimited
> scheduling priority             (-e) 0
> file size               (blocks, -f) unlimited
> pending signals                 (-i) 26505
> max locked memory       (kbytes, -l) 64
> max memory size         (kbytes, -m) unlimited
> open files                      (-n) 1024
> pipe size            (512 bytes, -p) 8
> POSIX message queues     (bytes, -q) 819200
> real-time priority              (-r) 0
> stack size              (kbytes, -s) 8192
> cpu time               (seconds, -t) unlimited
> max user processes              (-u) 4096
> virtual memory          (kbytes, -v) unlimited
> file locks                      (-x) unlimited
>  
> Can someone help me?
>
> Thanks for help!
>  
> Best regards
> Thomas Manninger

Check 'doveconf service/lmtp' for dovecot imposed limits. If vsz_limit
is 18446744073709551615, it means default_vsz_limit is used. Check out
'doveconf default_vsz_limit'. You can then decide if you want to set
some limit for lmtp only or increase the default limit.
 
Aki