libmodsecurity + inspect files not working

Hi folks

I'm using libmodsecurity + nginx and I tried to inspect a possible virus
infection.
I used the old crs v2.0 rule like below:
SecRule FILES_TMPNAMES "@inspectFile /bin/runAV" \
"phase:2,t:none,block,msg:'Virus found in uploaded
file',id:'950115',tag:'MALICIOUS_SOFTWARE/VIRUS',tag:'PCI/5.1',severity:'2',setvar:tx.anomaly_score=+%{tx.critical_anomaly_score},setvar:tx.%{
rule.id}-MALICIOUS_SOFTWARE/VIRUS-%{matched_var_name}=%{tx.0}"

It doesn't recognize any virus! I tested the clamAv and it responds to the
same virus file I have uploaded. I also tried modsecurity_nginx_refactoring
and it could capture the virus file.
However no success on libmodsecurity + nginx.

P.S.
1. For modsecurity v2.0 nginx refactoring branch I've set SecUploadKeepFiles
RelevantOnly and for libmodsecurity I've set SecUploadKeepFiles on
2. I tried more verbose debug logs with SecDebugLogLevel 9 and I get the
following:
                 [4] (Rule: 950115) Executing operator "InspectFile" with
param "/bin/runAV" against FILES_TMPNAMES.
                 [4] Rule returned 0.
                 [9] Matched vars cleaned.
3. I Suspected to  FILES_TMPNAMES  so I added the following rule:
        SecRule FILES_TMPNAMES "@rx .*" \
              "phase:2,t:none,block,msg:'Virus found in uploaded
file',id:'116',tag:'MALICIOUS_SOFTWARE/VIRUS',tag:'PCI/5.1',severity:'2',setvar:tx.anomaly_score=+%{tx.critical_anomaly_score},setvar:tx.%{
rule.id}-MALICIOUS_SOFTWARE/VIRUS-%{matched_var_name}=%{tx.0}"
and the debug log now contains:
                 [4] (Rule: 116) Executing operator "Rx" with param ".*"
against FILES_TMPNAMES.
                 [4] Rule returned 0.
                 [9] Matched vars cleaned.
It turns out the  FILES_TMPNAMES is empty.

What Am I missing??

-- 
                    regards
                 Ehsan.Mahdavi

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