[Dovecot] Out of memory

[Uldis Pakuls]

For large mailboxes (64k + messages)  using maildir I got  random "out
of memory" errors.


[mail addresses hidden]

dovecot: Dec 05 18:25:27 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:25:27 Error: child 14142 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:27:29 Error: IMAP(****@****): file maildir-uidlist.c: line 1117 (maildir_uidlist_sync_deinit): assertion failed: (ctx->locked)
dovecot: Dec 05 18:27:29 Error: IMAP(****@****): Raw backtrace: imap [0x5555555bd6fe] -> imap [0x5555555bd43e] -> imap [0x55555557dd57] -> imap [0x55555557c026] -> imap(maildir_storage_sync_force+0x43) [0x55555557c2b3] -> imap(maildir_storage_sync_init+0xc2) [0x55555557c3e2] -> imap(imap_sync_nonselected+0xf) [0x55555557533f] -> imap(_cmd_select_full+0xc5) [0x55555556da05] -> imap(cmd_select+0xb) [0x55555556db9b] -> imap [0x55555556eee7] -> imap [0x55555556ef79] -> imap(_client_input+0x6f) [0x55555556f61f] -> imap(io_loop_handler_run+0x108) [0x5555555c2f38] -> imap(io_loop_run+0x18) [0x5555555c20f8] -> imap(main+0x41b) [0x5555555770fb] -> /lib64/libc.so.6(__libc_start_main+0xf4) [0x2b02fcb30b54] -> imap [0x55555556a6e9]
dovecot: Dec 05 18:27:29 Error: child 14144 (imap) killed with signal 6
dovecot: Dec 05 18:27:37 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:27:37 Error: child 14211 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:29:41 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:29:41 Error: child 14215 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:31:46 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:31:46 Error: child 14248 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:33:50 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:33:50 Error: child 14345 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:35:55 Error: IMAP(****@****): block_alloc(): Out of memory
dovecot: Dec 05 18:35:55 Error: child 14406 (imap) returned error 83 (Out of memory)
dovecot: Dec 05 18:37:59 Error: IMAP(****@****): block_alloc(): Out of memory


dovecot 1.0.17
mail_prcosess_size = 256

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) 73728
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) 6959460
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) 73728
virtual memory          (kbytes, -v) 9910880
file locks                      (-x) unlimited

cat /proc/meminfo :
MemTotal:      8187540 kB
MemFree:        353060 kB
Buffers:        737968 kB
Cached:        5094700 kB
SwapCached:         20 kB
Active:        4255100 kB
Inactive:      2787980 kB
SwapTotal:     4200988 kB
SwapFree:      4192956 kB
Dirty:           20184 kB
Writeback:         124 kB
AnonPages:     1165756 kB
Mapped:          60472 kB
Slab:           686100 kB
SReclaimable:   591232 kB
SUnreclaim:      94868 kB
PageTables:      31408 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   8294756 kB
Committed_AS:  3417584 kB
VmallocTotal: 34359738367 kB
VmallocUsed:     91040 kB
VmallocChunk: 34359645611 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB



What I need to configure to increase available resources? What else I
can done?

Uldis