dovecot: lmtp: Error: fatal error: failed to reserve page summary memory

Sorry for offtopic, don't know where to ask it after updating from ubuntu 18 to 20 started getting this on running golang binary from sieve rules file

Sep 17 08:54:00 lonjemail spamd[3231]: spamd: connection from ::1
[::1]:57844 to port 783, fd 5
Sep 17 08:54:00 lonjemail spamd[3231]: spamd: setuid to Debian-exim
succeeded
Sep 17 08:54:00 lonjemail spamd[3231]: spamd: processing message
<CANcP0tbws-r=L8KrTug_NKLk0EuPwo1vKotdpV=Pf95Pxusbww@mail.gmail.com> for
Debian-exim:114
Sep 17 08:54:00 lonjemail systemd-resolved[527]: Server returned error
NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying
transaction with reduced feature level UDP.
Sep 17 08:54:00 lonjemail systemd-resolved[527]: message repeated 8 times:
[ Server returned error NXDOMAIN, mitigating potential DNS violation
DVE-2018-0001, retrying transaction with reduced feature level UDP.]
Sep 17 08:54:00 lonjemail spamd[3231]: spamd: clean message (1.1/5.0) for
Debian-exim:114 in 0.3 seconds, 2760 bytes.
Sep 17 08:54:00 lonjemail spamd[3231]: spamd: result: . 1 -
DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,RDNS_NONE,SPF_HELO_NONE,SPF_PASS
scantime=0.3,size=2760,user=Debian-exim,uid=114,required_score=5.0,rhost=::1,raddr=::1,rport=57844,mid=<CANcP0tbws-r=L8KrTug_NKLk0EuPwo1vKotdpV=
Pf95Pxusbww@mail.gmail.com>,autolearn=no autolearn_force=no
Sep 17 08:54:00 lonjemail dovecot: lmtp(4254): Connect from local
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error: fatal error: failed to
reserve page summary memory
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error: runtime stack:
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error: runtime.throw(0x1a48db5,
0x25)
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/panic.go:1116 +0x72 fp=0x7ffe160d5860
sp=0x7ffe160d5830 pc=0x4ce5d2
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
runtime.(*pageAlloc).sysInit(0x232c268)
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/mpagealloc_64bit.go:80 +0x185
fp=0x7ffe160d58f0 sp=0x7ffe160d5860 pc=0x4c4e25
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
runtime.(*pageAlloc).init(0x232c268, 0x232c260, 0x25cb8d8)
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/mpagealloc.go:317 +0x75 fp=0x7ffe160d5918
sp=0x7ffe160d58f0 pc=0x4c2815
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
runtime.(*mheap).init(0x232c260)
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/mheap.go:743 +0x24b fp=0x7ffe160d5940
sp=0x7ffe160d5918 pc=0x4bf84b
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error: runtime.mallocinit()
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/malloc.go:480 +0x109 fp=0x7ffe160d5968
sp=0x7ffe160d5940 pc=0x4a4c49
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error: runtime.schedinit()
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/proc.go:563 +0x65 fp=0x7ffe160d59c0
sp=0x7ffe160d5968 pc=0x4d1f25
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
runtime.rt0_go(0x7ffe160d5ad8, 0x2, 0x7ffe160d5ad8, 0x1813580,
0x7fd3cc8a80b3, 0x7fd3cca6cb80, 0x7ffe160d5ad8, 0x200011c00, 0x501080,
0x1813580, ...)
Sep 17 08:54:00 lonjemail dovecot: lmtp: Error:
#011/usr/local/go/src/runtime/asm_amd64.s:214 +0x125 fp=0x7ffe160d59c8
sp=0x7ffe160d59c0 pc=0x5011c5
Sep 17 08:54:00 lonjemail dovecot:
lmtp(roman)<4254></X0wOCgkY1+eEAAAgcArzw>: program
exec:/usr/lib/dovecot/sieve-execute/smtp (4255): Terminated with non-zero
exit code 2
Sep 17 08:54:00 lonjemail dovecot:
lmtp(roman)<4254></X0wOCgkY1+eEAAAgcArzw>: sieve:
msgid=<CANcP0tbws-r=L8KrTug_NKLk0EuPwo1vKotdpV=Pf95Pxusbww@mail.gmail.com>:
stored mail into mailbox 'Unsubscribe.Neighbors'
Sep 17 08:54:00 lonjemail dovecot: lmtp(4254): Disconnect from local:
Client has quit the connection (state=READY)
Sep 17 08:55:01 lonjemail CRON[4257]: (root) CMD (command -v debian-sa1 >
/dev/null && debian-sa1 1 1)

here is sieve rules:

require ["variables", "fileinto", "mailbox", "vnd.dovecot.execute"];
if address :matches "from" "*" { set "from" "${1}"; }

if anyof ( header :contains "subject" "unsubscribe neighbours",
                header :contains "subject" "unsubscribe neighbors") {
  execute "smtp" "-neighbors=${from}";
  fileinto :create "Unsubscribe.Neighbors";
} elsif address :contains "from" ["mailer-daemon", "postmaster", "internet
mail delivery"] {
  if header :matches "X-Failed-Recipients" "*" {
    execute "smtp" "-email=${1}";
    fileinto :create "Mail Delivery System";
  } else {
    fileinto :create "Mail Delivery System.Warning";
  }
} else {
  # The rest goes into INBOX
  # default is "implicit keep", we do it explicitly here
  keep;
}

Attempted in /etc/dovecot/conf.d/90-sieve.conf vsz_limit = 256M with no luck Can somebody help me in fixing it?