[Bug 232373] security/clamav shuts down - Can't allocate memory ERROR

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232373

            Bug ID: 232373
           Summary: security/clamav shuts down - Can't allocate memory
                    ERROR
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ler at FreeBSD.org
          Reporter: marko.cupac at mimar.rs
             Flags: maintainer-feedback?(ler at FreeBSD.org)
          Assignee: ler at FreeBSD.org

Hi,

I am using clamav-clamd, called by amavisd-new, to scan emails on postfix mail
relay server. Recently it started to shut down with the following message:

Thu Oct 18 07:53:21 2018 -> SelfCheck: Database status OK.
Thu Oct 18 07:56:02 2018 ->
/var/amavis/tmp/amavis-20181018T074152-69671-oHlEltOR/parts/p009: reported
CL_VIRUS but no virname returned!
Thu Oct 18 07:56:02 2018 ->
/var/amavis/tmp/amavis-20181018T074152-69671-oHlEltOR/parts/p009: Can't
allocate memory ERROR
Thu Oct 18 07:56:29 2018 -> WARNING: Write to syncpipe failed
Thu Oct 18 07:56:29 2018 -> Waiting for all threads to finish
Thu Oct 18 07:56:30 2018 -> Shutting down the main socket.
Thu Oct 18 07:56:30 2018 -> Pid file removed.
Thu Oct 18 07:56:30 2018 -> --- Stopped at Thu Oct 18 07:56:30 2018

This is the third occurrence in a week, and it causes me quite a headache, as
all the emails wait in queue before I manually restart it.

The server it runs on has plenty of RAM during standard operation:

Mem: 2198M Active, 20G Inact, 2936M Wired, 1412M Buf, 22G Free
Swap: 4096M Total, 4096M Free

All the limits are at its defaults:

Thu Oct 18 09:04:18 2018 -> +++ Started at Thu Oct 18 09:04:18 2018
Thu Oct 18 09:04:18 2018 -> Received 0 file descriptor(s) from systemd.
Thu Oct 18 09:04:18 2018 -> clamd daemon 0.100.2 (OS: freebsd11.2, ARCH: amd64,
CPU: amd64)
Thu Oct 18 09:04:18 2018 -> Log file size limited to 1048576 bytes.
Thu Oct 18 09:04:18 2018 -> Reading databases from /var/db/clamav
Thu Oct 18 09:04:18 2018 -> Bytecode: Security mode set to "TrustSigned".
Thu Oct 18 09:04:38 2018 -> Loaded 6691209 signatures.
Thu Oct 18 09:04:41 2018 -> LOCAL: Unix socket file /var/run/clamav/clamd.sock
Thu Oct 18 09:04:41 2018 -> LOCAL: Setting connection queue length to 200
Thu Oct 18 09:04:41 2018 -> Limits: Global size limit set to 104857600 bytes.
Thu Oct 18 09:04:41 2018 -> Limits: File size limit set to 26214400 bytes.
Thu Oct 18 09:04:41 2018 -> Limits: Recursion level limit set to 16.
Thu Oct 18 09:04:41 2018 -> Limits: Files limit set to 10000.
Thu Oct 18 09:04:41 2018 -> Limits: Core-dump limit is 9223372036854775807.
Thu Oct 18 09:04:41 2018 -> Limits: MaxEmbeddedPE limit set to 10485760 bytes.
Thu Oct 18 09:04:41 2018 -> Limits: MaxHTMLNormalize limit set to 10485760
bytes.
Thu Oct 18 09:04:41 2018 -> Limits: MaxHTMLNoTags limit set to 2097152 bytes.
Thu Oct 18 09:04:41 2018 -> Limits: MaxScriptNormalize limit set to 5242880
bytes.
Thu Oct 18 09:04:41 2018 -> Limits: MaxZipTypeRcg limit set to 1048576 bytes.
Thu Oct 18 09:04:41 2018 -> Limits: MaxPartitions limit set to 50.
Thu Oct 18 09:04:41 2018 -> Limits: MaxIconsPE limit set to 100.
Thu Oct 18 09:04:41 2018 -> Limits: MaxRecHWP3 limit set to 16.
Thu Oct 18 09:04:41 2018 -> Limits: PCREMatchLimit limit set to 100000.
Thu Oct 18 09:04:41 2018 -> Limits: PCRERecMatchLimit limit set to 5000.
Thu Oct 18 09:04:41 2018 -> Limits: PCREMaxFileSize limit set to 26214400.

Any help much appreciated.

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