OpenBGPD fatal in RDE: rde_dispatch_imsg_session: imsg_get error: Cannot allocate memory

Hi,


I'm running a pretty busy OpenBGPd router (~250 bgp sessions) with 4
IPv4 and 4 IPv6 full views, plus a few IX sessions.


# bgpctl show rib mem
RDE memory statistics
    820983 IPv4 unicast network entries using 31.3M of memory
    203228 IPv6 unicast network entries using 10.9M of memory
   1935802 rib entries using 118M of memory
   6348318 prefix entries using 775M of memory
    728103 BGP path attribute entries using 50.0M of memory
           and holding 6348318 references
    464633 BGP AS-PATH attribute entries using 22.3M of memory
           and holding 728103 references
     29055 entries for 371905 BGP communities using 8.6M of memory
           and holding 6348318 references
     18541 BGP attributes entries using 724K of memory
           and holding 1618379 references
     18540 BGP attributes using 145K of memory
         0 as-set elements in 0 tables using 0B of memory
        64 prefix-set elements using 3.0K of memory
RIB using 1008M of memory
Sets using 3.0K of memory

RDE hash statistics
        path hash: size 131072, 728103 entries
            min 0 max 19 avg/std-dev = 5.555/2.268
        aspath hash: size 131072, 464633 entries
            min 0 max 17 avg/std-dev = 3.545/1.853
        comm hash: size 16384, 29055 entries
            min 0 max 8 avg/std-dev = 1.773/0.925
        attr hash: size 16384, 18541 entries
            min 0 max 8 avg/std-dev = 1.132/0.848


More often than not the BGPd daemon is crashing (although having plenty
of RAM (80G) on the server) with: /var/log/messages

fatal in RDE: rde_dispatch_imsg_session: imsg_get error: Cannot allocate
memory

fatal in RDE: prefix_alloc: Cannot allocate memory

fatal in RDE: communities_copy: Cannot allocate memory

peer closed imsg connection
main: Lost connection to RDE
peer closed imsg connection
SE: Lost connection to RDE
peer closed imsg connection
SE: Lost connection to RDE control
Can't send message 57 to RDE, pipe closed
last message repeated 12 times
peer closed imsg connection
SE: Lost connection to parent
neighbor A.B.C.D (sas-v4-001): sending notification: Cease,
administratively down


:/etc/login.conf:

default:\
        :path=/usr/bin /bin /usr/sbin /sbin /usr/X11R6/bin
/usr/local/bin /usr/local/sbin:\
        :umask=022:\
        :datasize-max=768M:\
        :datasize-cur=768M:\
        :maxproc-max=256:\
        :maxproc-cur=128:\
        :openfiles-max=1024:\
        :openfiles-cur=512:\
        :stacksize-cur=4M:\
        :localcipher=blowfish,a:\
        :tc=auth-defaults:\
        :tc=auth-ftp-defaults:

daemon:\
        :ignorenologin:\
        :datasize=infinity:\
        :maxproc=infinity:\
        :openfiles-max=1024:\
        :openfiles-cur=128:\
        :stacksize-cur=8M:\
        :localcipher=blowfish,a:\
        :tc=default:

bgpd:\
        :openfiles=512:\
        :tc=daemon:

How can I pinpoint the source of the problem ?


Thanks