[Snort-devel] Critical: Memory leak in snort 2.9 and FreeBSD >= 10.4

elof at sentor.se elof at sentor.se
Sat May 26 15:20:21 EDT 2018


Hi Carter!

No, I use no extra plugins.

I'm trying to generate a snort.conf as identical as possible to my 
original, but disabling all http_inspect decompression.
On the first test-sensor I remove "inspect_gzip" and 
"unlimited_decompress" from the "preprocessor http_inspect_server: server 
default" profile.

HttpInspect Config:
     GLOBAL CONFIG
       Detect Proxy Usage:       NO
       IIS Unicode Map Filename: /usr/local/etc/snort/unicode.map
       IIS Unicode Map Codepage: 1252
       Memcap used for logging URI and Hostname: 603979776
       Max Gzip Memory: 10000000
       Max Gzip Sessions: 19230
       Gzip Compress Depth: 32767
       Gzip Decompress Depth: 65535
     DEFAULT SERVER CONFIG:
       Server profile: All
       Ports (PAF): 80 81 311 383 591 593 901 1220 1414 1741 1830 2301 2381 
2809 3037 3128 3702 4343 4848 5250 6988 7000 7001 7144 7145 7510 7777 7779 
8000 8008 8014 8028 8080 8085 8088 8090 8118 8123 8180 8181 8243 8280 8300 
8800 8888 8899 9000 9060 9080 9090 9091 9443 9999 10080 11371 34443 34444 
41080 50002 55555
       Server Flow Depth: 800
       Client Flow Depth: 600
       Max Chunk Length: 500000
       Small Chunk Length Evasion: chunk size <= 10, threshold >= 5 times
       Max Header Field Length: 750
       Max Number Header Fields: 100
       Max Number of WhiteSpaces allowed with header folding: 200
       Inspect Pipeline Requests: YES
       URI Discovery Strict Mode: NO
       Allow Proxy Usage: NO
       Disable Alerting: YES
       Oversize Dir Length: 500
       Only inspect URI: NO
       Normalize HTTP Headers: NO
       Inspect HTTP Cookies: YES
       Inspect HTTP Responses: YES
       Extract Gzip from responses: NO
       Decompress response files:
       Unlimited decompression of gzip data from responses: NO
       Normalize Javascripts in HTTP Responses: YES
       Max Number of WhiteSpaces allowed with Javascript Obfuscation in 
HTTP responses: 200
       Normalize HTTP Cookies: NO
       Enable XFF and True Client IP: NO
       Log HTTP URI data: NO
       Log HTTP Hostname data: NO
       Extended ASCII code support in URI: NO
       Ascii: YES alert: NO
       Double Decoding: YES alert: NO
       %U Encoding: YES alert: YES
       Bare Byte: YES alert: NO
       UTF 8: YES alert: NO
       IIS Unicode: YES alert: NO
       Multiple Slash: YES alert: NO
       IIS Backslash: YES alert: NO
       Directory Traversal: YES alert: NO
       Web Root Traversal: YES alert: NO
       Apache WhiteSpace: YES alert: NO
       IIS Delimiter: YES alert: NO
       IIS Unicode Map: GLOBAL IIS UNICODE MAP CONFIG
       Non-RFC Compliant Characters: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 
0x07
       Whitespace Characters: 0x09 0x0b 0x0c 0x0d
       Legacy mode: NO


On the second test-sensor I disable http_inspect completely.



In both tests there are no memory leak. :-)

Before, snort grew to use 100% of the RAM in 20-30 minutes.
Now, the first sensor has not grown much after 5 hours:

15:55 process start
           PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME 
WCPU COMMAND
15:55 : 32032 snort         2  20    0  2193M   211M nanslp  5   0:05 
5.76% snort
16:05 : 32032 snort         2  20    0  2193M   218M nanslp  3   0:42 
6.30% snort
16:15 : 32032 snort         2  20    0  2201M   288M nanslp  5   1:43 
12.26% snort
16:34 : 32032 snort         2  20    0  2209M   296M nanslp  6   3:49 
10.06% snort
16:46 : 32032 snort         2  20    0  2213M   300M nanslp  6   4:59 
8.06% snort
17:04 : 32032 snort         2  20    0  2213M   301M nanslp  3   6:12 
6.05% snort
18:02 : 32032 snort         2  20    0  2245M   329M nanslp  5   9:55 
5.47% snort
21:02 : 32032 snort         2  20    0  2249M   335M nanslp  5  21:56 
6.88% snort


...and neither has the second sensor after 6 hours:
14:58 process start
           PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME 
WCPU COMMAND
15:07 : 60477 snort         2  20    0   833M   360M nanslp  4   4:10 
46.97% snort
15:26 : 60477 snort         2  20    0   909M   438M nanslp  1  12:42 
45.07% snort
15:36 : 60477 snort         2  20    0   953M   478M nanslp  0  17:07 
39.99% snort
16:05 : 60477 snort         2  20    0   969M   495M nanslp  5  30:02 
41.70% snort
16:34 : 60477 snort         2  20    0   973M   523M nanslp  2  43:51 
43.55% snort
16:46 : 60477 snort         2  20    0   973M   523M nanslp  1  49:26 
44.09% snort
17:04 : 60477 snort         2  20    0   973M   523M nanslp  7  58:14 
43.16% snort
18:02 : 60477 snort         2  20    0   973M   525M nanslp  7  85:43 
46.68% snort
21:02 : 60477 snort         2  20    0   981M   651M nanslp  6 172:05 
45.75% snort


My conclusion: libz is ruled in.


I hope you can investigate and bugfix this.
(As I said earlier, I'm no programmer, but I can assist in compiling and 
debugging)

/Elof


On Fri, 25 May 2018, Carter Waxman (cwaxman) wrote:

> Hi Elof,
>
> I want to rule in or out the interaction with zlib. It’s is only used in http_inspect, so if you disable decompression, swf decompression, and pdf_decompression, do you still see a memory leak? Also, are you running with any extra / custom plugins that might use zlib?
>
> Thanks,
> Carter
>
> On 5/24/18, 10:19 AM, "Snort-devel on behalf of elof at sentor.se" <snort-devel-bounces at lists.snort.org on behalf of elof at sentor.se> wrote:
>
>
>    Hi list (and Zi from FreeBSD ports)!
>
>    I sent the below question to snort-users in March but got no response.
>
>    Now I have upgraded a couple of more systems. This time from FreeBSD
>    10.3 to 10.4 (not from 10.3 to 11.1 as before) and snort start leaking
>    memory on all of them, just as it did in FreeBSD 11.1!
>
>
>    FreeBSD 10.3: snort --version
>        ,,_     -*> Snort! <*-
>       o"  )~   Version 2.9.11.1 (Build 268)
>        ''''    By Martin Roesch & The Snort Team:
>    http://www.snort.org/contact#team
>                Copyright (C) 2014-2017 Cisco and/or its affiliates. All rights
>    reserved.
>                Copyright (C) 1998-2013 Sourcefire, Inc., et al.
>                Using libpcap version 1.8.1
>                Using PCRE version: 8.40 2017-01-11
>                Using ZLIB version: 1.2.8
>    Snort is working fine. No memory leak. :-)
>
>
>    FreeBSD 10.4: snort --version
>        ,,_     -*> Snort! <*-
>       o"  )~   Version 2.9.11.1 (Build 268)
>        ''''    By Martin Roesch & The Snort Team:
>    http://www.snort.org/contact#team
>                Copyright (C) 2014-2017 Cisco and/or its affiliates. All rights
>    reserved.
>                Copyright (C) 1998-2013 Sourcefire, Inc., et al.
>                Using libpcap version 1.8.1
>                Using PCRE version: 8.42 2018-03-20
>                Using ZLIB version: 1.2.11
>    Snort has a memory leak. :-(
>
>
>    FreeBSD 11.1: snort --version
>       ,,_     -*> Snort! <*-
>      o"  )~   Version 2.9.11.1 (Build 268)
>       ''''    By Martin Roesch & The Snort Team:
>    http://www.snort.org/contact#team
>               Copyright (C) 2014-2017 Cisco and/or its affiliates. All rights
>    reserved.
>               Copyright (C) 1998-2013 Sourcefire, Inc., et al.
>               Using libpcap version 1.8.1
>               Using PCRE version: 8.40 2017-01-11
>               Using ZLIB version: 1.2.11
>    Snort has a memory leak. :-(
>
>
>    The snort version+build is exactly the same in all three OS versions.
>    Libpcap is the same.
>    PCRE is the same between 10.3 and the test on 11.1.
>    ZLIB has changed from v1.2.8 to v1.2.11 in both cases.
>
>    So in 10.3 everything is working fine.
>    In 10.4 and 11.1, with ZLIB 1.2.11, there is a memory leak.
>
>    I suspect there's a problem in snort together with ZLIB 1.2.11.
>
>
>
>    On a sensor which see lots of traffic, all of its 16 GB RAM is consumed by
>    snort in roughly 30 minutes. (swap get full and things crash)
>
>    This problem is reproduceable all the time, on all upgraded boxes.
>
>
>
>    Can you developers please take a look at this?
>
>    Let me know if you need more information/testing from me.
>    I'm no programmer, but I can compile snort with debugging symbols and I
>    can run gdb commands if you provide them.
>
>
>
>    Some more info:
>
>    Arch: amd64
>    12 CPUs: Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.60GHz
>    RAM: 16 GB
>
>    I'm building snort from FreeBSD ports, using poudriere.
>
>    Build options:
>    ---Begin OPTIONS List---
>    ===> The following configuration options are available for
>    snort-2.9.11.1_1:
>          APPID=off: Build with application id support (EXPERIMENTAL)
>          DOCS=on: Build and/or install documentation
>          FILEINSPECT=off: Build with extended file inspection features
>    (EXPERIMENTAL)
>          GRE=off: GRE support
>          HA=off: Enable high-availability state sharing (EXPERIMENTAL)
>          IPV6=off: IPv6 in snort.conf
>          LRGPCAP=off: Pcaps larger than 2GB
>          NONETHER=off: Non-Ethernet Decoders
>          NORMALIZER=on: Normalizer
>          PERFPROFILE=on: Performance profiling
>          SOURCEFIRE=on: Sourcefire recommended build options
>    ====> Depend on 3rd party addons
>          BARNYARD=off: Depend on barnyard2 (supports also snortsam)
>          PULLEDPORK=off: Depend on pulledpork
>    ====> Developer options
>          DBGSNORT=off: Enable debugging symbols+core dumps
>    ===> Use 'make config' to modify these settings
>    ---End OPTIONS List---
>
>    Snort daq is running in pcap mode.
>    Snort is running in passive mode.
>    Snort is using search-method ac-split.
>    preprocessor http_inspect: global iis_unicode_map
>    /usr/local/etc/snort/unicode.map 1252 compress_depth 65535
>    decompress_depth 65535 max_gzip_mem 1000000 memcap 603979776
>    http_inspect: unlimited_decompress is enabled
>    http_inspect: inspect_gzip is enabled
>
>
>    PS:
>    libz is part of the FreeBSD base system, it is not a port, so I can't hold
>    it back when upgrading the OS.
>
>    /Elof
>
>
>
>    ---------- Forwarded message ----------
>    From: elof at sentor.se
>    To: snort-users mailinglist <snort-users at lists.sourceforge.net>
>    Date: Fri, 2 Mar 2018 16:35:24 +0100 (CET)
>    Subject: Memory leak in snort 2.9 and FreeBSD 11?
>
>
>    Critical issue.
>
>
>    After I upgraded a few FreeBSD 10.3 machines to 11.1, snort has begun eating
>    memory until it crashes.
>    This seem to be happening on all upgraded machines, all the time.
>
>
>    I suspect there's a memory leak somewhere.
>
>
>    Example of 40 minutes after I start snort. I run:
>
>    while true
>    do
>       ps faxuw | egrep "^USER|/[s]nort "
>       echo "---"
>       top | grep -B3 ^Swap
>       echo "---"
>       sleep 120
>    done
>
>    Here you see it start to consume RAM:
>                         ####
>    USER      PID  %CPU %MEM     VSZ    RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  98.4  1.4  356096 232376  -  Rs   14:40     0:01.35 snort
>    ---
>    Mem: 550M Active, 174M Inact, 1585M Wired, 13G Free
>    ARC: 711M Total, 153M MFU, 545M MRU, 1600K Anon, 4623K Header, 7465K Other
>          593M Compressed, 1647M Uncompressed, 2.78:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  54.3  7.2 3002112 1199900  -  Rs   14:40     1:04.85 snort
>    ---
>    Mem: 1499M Active, 191M Inact, 1670M Wired, 12G Free
>    ARC: 763M Total, 178M MFU, 572M MRU, 1308K Anon, 4860K Header, 7441K Other
>          646M Compressed, 1779M Uncompressed, 2.75:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  54.3 12.9 5644032 2155388  -  Ss   14:40     2:07.16 snort
>    ---
>    Mem: 2427M Active, 191M Inact, 1682M Wired, 11G Free
>    ARC: 777M Total, 178M MFU, 585M MRU, 1344K Anon, 4935K Header, 7513K Other
>          661M Compressed, 1815M Uncompressed, 2.75:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  54.5 18.7 8275712 3114844  -  Rs   14:40     3:09.86 snort
>    ---
>    Mem: 3357M Active, 192M Inact, 1768M Wired, 10G Free
>    ARC: 821M Total, 194M MFU, 614M MRU, 556K Anon, 5195K Header, 7513K Other
>          711M Compressed, 1942M Uncompressed, 2.73:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  54.2 24.3 10862336 4053456  -  Rs   14:40     4:11.28 snort
>    ---
>    Mem: 4270M Active, 194M Inact, 1778M Wired, 9646M Free
>    ARC: 890M Total, 299M MFU, 578M MRU, 400K Anon, 5243K Header, 7442K Other
>          726M Compressed, 1978M Uncompressed, 2.73:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  56.2 29.9 13461248 4998904  -  Ss   14:40     5:13.96 snort
>    ---
>    Mem: 5188M Active, 195M Inact, 1798M Wired, 8708M Free
>    ARC: 826M Total, 261M MFU, 551M MRU, 528K Anon, 5300K Header, 7410K Other
>          741M Compressed, 2015M Uncompressed, 2.72:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  53.1 35.5 16033536 5929068  -  Rs   14:40     6:15.56 snort
>    ---
>    Mem: 6091M Active, 195M Inact, 1823M Wired, 7779M Free
>    ARC: 870M Total, 255M MFU, 602M MRU, 276K Anon, 5391K Header, 7521K Other
>          755M Compressed, 2051M Uncompressed, 2.72:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  51.2 41.1 18605824 6867124  -  Ss   14:40     7:16.95 snort
>    ---
>    Mem: 7002M Active, 195M Inact, 1848M Wired, 6843M Free
>    ARC: 885M Total, 221M MFU, 651M MRU, 288K Anon, 5454K Header, 7515K Other
>          769M Compressed, 2087M Uncompressed, 2.71:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER      PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    7337  54.0 46.8 21212928 7810464  -  Rs   14:40     8:19.24 snort
>    ---
>    Mem: 7924M Active, 195M Inact, 1943M Wired, 5826M Free
>    ARC: 936M Total, 218M MFU, 703M MRU, 952K Anon, 5766K Header, 7829K Other
>          824M Compressed, 2222M Uncompressed, 2.70:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  53.0 52.5 23834368 8762624  -  Ss   14:40     9:21.14 snort
>    ---
>    Mem: 8849M Active, 195M Inact, 1954M Wired, 4891M Free
>    ARC: 951M Total, 218M MFU, 718M MRU, 920K Anon, 5827K Header, 7814K Other
>          838M Compressed, 2259M Uncompressed, 2.69:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  50.9 58.2 26472192 9721948  -  Rs   14:40    10:23.33 snort
>    ---
>    Mem: 9782M Active, 195M Inact, 1971M Wired, 3941M Free
>    ARC: 965M Total, 220M MFU, 731M MRU, 920K Anon, 5882K Header, 7822K Other
>          853M Compressed, 2295M Uncompressed, 2.69:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  50.3 63.9 29105920 10676928  -  Rs   14:40    11:26.69 snort
>    ---
>    Mem: 10G Active, 204M Inact, 2116M Wired, 2852M Free
>    ARC: 1062M Total, 274M MFU, 774M MRU, 1052K Anon, 6252K Header, 7728K Other
>          939M Compressed, 2510M Uncompressed, 2.67:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  55.5 69.6 31735552 11617828  -  Rs   14:40    12:28.81 snort
>    ---
>    Mem: 11G Active, 224M Inact, 2132M Wired, 1921M Free
>    ARC: 1092M Total, 300M MFU, 777M MRU, 1072K Anon, 6285K Header, 7591K Other
>          954M Compressed, 2547M Uncompressed, 2.67:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  55.1 75.1 34324224 12545340  -  Rs   14:40    13:30.78 snort
>    ---
>    Mem: 12G Active, 230M Inact, 2222M Wired, 931M Free
>    ARC: 1117M Total, 325M MFU, 777M MRU, 1204K Anon, 6542K Header, 7580K Other
>          1010M Compressed, 2686M Uncompressed, 2.66:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  55.2 80.4 36824832 13427160  -  Ss   14:40    14:32.93 snort
>    ---
>    Mem: 12G Active, 263M Inact, 1428M Laundry, 1929M Wired, 367M Free
>    ARC: 1156M Total, 325M MFU, 816M MRU, 1068K Anon, 6614K Header, 7613K Other
>          1025M Compressed, 2722M Uncompressed, 2.66:1 Ratio
>    Swap: 4096M Total, 4096M Free
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  54.6 82.6 39397120 13800500  -  Rs   14:40    15:35.14 snort
>    ---
>    Mem: 12G Active, 110M Inact, 1784M Laundry, 1937M Wired, 191M Free
>    ARC: 1159M Total, 323M MFU, 822M MRU, 936K Anon, 6648K Header, 7488K Other
>          1039M Compressed, 2758M Uncompressed, 2.65:1 Ratio
>    Swap: 4096M Total, 685M Used, 3411M Free, 16% Inuse
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  53.8 82.6 41801472 13800476  -  Ss   14:40    16:35.38 snort
>    ---
>    Mem: 11G Active, 107M Inact, 1846M Laundry, 1990M Wired, 182M Free
>    ARC: 1208M Total, 338M MFU, 854M MRU, 1552K Anon, 6866K Header, 7564K Other
>          1087M Compressed, 2878M Uncompressed, 2.65:1 Ratio
>    Swap: 4096M Total, 1508M Used, 2587M Free, 36% Inuse
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  54.5 82.2 44414720 13735076  -  Rs   14:40    17:38.62 snort
>    ---
>    Mem: 12G Active, 34M Inact, 1766M Laundry, 2014M Wired, 292M Free
>    ARC: 1221M Total, 337M MFU, 868M MRU, 1436K Anon, 6944K Header, 7616K Other
>          1102M Compressed, 2914M Uncompressed, 2.64:1 Ratio
>    Swap: 4096M Total, 2551M Used, 1544M Free, 62% Inuse
>    ---
>    USER       PID  %CPU %MEM      VSZ      RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337  54.6 82.1 46968576 13714884  -  Ss   14:40    18:42.19 snort
>    ---
>    Mem: 11G Active, 64M Inact, 1884M Laundry, 2058M Wired, 259M Free
>    ARC: 1252M Total, 352M MFU, 885M MRU, 672K Anon, 7150K Header, 7525K Other
>          1153M Compressed, 3043M Uncompressed, 2.64:1 Ratio
>    Swap: 4096M Total, 3457M Used, 639M Free, 84% Inuse
>    ---
>    USER       PID  %CPU %MEM     VSZ    RSS TT  STAT STARTED      TIME COMMAND
>    snort     7337   2.2  0.0       0     16  -  R<Es 14:40    19:49.65 snort
>    ---
>    Mem: 12G Active, 5252K Inact, 786M Laundry, 1937M Wired, 461M Free
>    ARC: 1319M Total, 384M MFU, 920M MRU, 967K Anon, 7275K Header, 7534K Other
>          1181M Compressed, 3112M Uncompressed, 2.63:1 Ratio
>    Swap: 4096M Total, 4096M Used, K Free, 100% Inuse
>    ---
>
>
>
>    After maxing out at 82.2% or RAM for a copuple of minutes, the process is
>    automatically killed by the system:
>
>    Mar  2 15:17:48 chobetsu-10 kernel: swap_pager: out of swap space
>    Mar  2 15:17:48 chobetsu-10 kernel: swap_pager_getswapspace(11): failed
>    Mar  2 15:20:18 chobetsu-10 kernel: pid 7337 (snort), uid 100, was killed: out
>    of swap space
>
>
>
>
>
>    ...the while-loop continues...
>    USER       PID  %CPU %MEM     VSZ    RSS TT  STAT STARTED      TIME COMMAND
>    <no snort process started>
>    ---
>    Mem: 272M Active, 12M Inact, 2079M Wired, 13G Free
>    ARC: 1376M Total, 516M MFU, 844M MRU, 1552K Anon, 7347K Header, 7524K Other
>          1197M Compressed, 3150M Uncompressed, 2.63:1 Ratio
>    Swap: 4096M Total, 225M Used, 3871M Free, 5% Inuse
>    ---
>
>
>
>
>    I startup snort again.
>    ...the while-loop continues...
>
>    USER       PID  %CPU %MEM     VSZ    RSS TT  STAT STARTED      TIME COMMAND
>    snort    14277  57.3  5.1 2055936 856740  -  Rs   15:23     0:43.21 snort
>    ---
>    Mem: 1090M Active, 56M Inact, 2136M Wired, 12G Free
>    ARC: 1330M Total, 435M MFU, 879M MRU, 1432K Anon, 7487K Header, 7824K Other
>          1213M Compressed, 3193M Uncompressed, 2.63:1 Ratio
>    Swap: 4096M Total, 190M Used, 3906M Free, 4% Inuse
>    ---
>    USER       PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    14277  57.9 11.0 4714240 1829656  -  Ss   15:23     1:49.20 snort
>    ---
>    Mem: 2046M Active, 97M Inact, 2366M Wired, 11G Free
>    ARC: 1401M Total, 438M MFU, 945M MRU, 1296K Anon, 8041K Header, 8700K Other
>          1314M Compressed, 3438M Uncompressed, 2.62:1 Ratio
>    Swap: 4096M Total, 172M Used, 3924M Free, 4% Inuse
>    ---
>    USER       PID  %CPU %MEM     VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    14277  54.3 16.8 7362304 2798096  -  Ss   15:23     2:54.43 snort
>    ---
>    Mem: 2985M Active, 98M Inact, 2378M Wired, 10G Free
>    ARC: 1450M Total, 438M MFU, 994M MRU, 1468K Anon, 8120K Header, 8754K Other
>          1329M Compressed, 3475M Uncompressed, 2.62:1 Ratio
>    Swap: 4096M Total, 172M Used, 3924M Free, 4% Inuse
>    ---
>    USER       PID  %CPU %MEM      VSZ     RSS TT  STAT STARTED      TIME COMMAND
>    snort    14277  60.4 22.6 10053376 3776916  -  Ss   15:23     4:00.53 snort
>
>    ...and so on until pid 14277 gets out of swap.
>
>
>
>    I'm running:
>    FreeBSD 11.1-RELEASE-p4 amd64
>    Snort      Version 2.9.11.1 (Build 268)
>                Using libpcap version 1.8.1
>                Using PCRE version: 8.40 2017-01-11
>                Using ZLIB version: 1.2.11
>
>
>
>    Has anyone else observed this?
>
>    Any tips on how I can help debug this further?
>
>    A SIGHUP don't reveal anything about what subsystem is eating memory.
>
>
>
>
>    I've tried setting two memcaps to a really low value, to see if the process
>    stop increasing in size:
>       preprocessor stream5_global: ......... memcap 128257751
>       preprocessor http_inspect: global .... memcap 85505167
>    No luck. The snort process grows to >80% of system RAM and then dies.
>
>
>
>    Some info about the snort conf:
>
>    Running in IDS mode
>    Detection: Search-Method = AC-Full-Q
>                Split Any/Any group = enabled
>                Search-Method-Optimizations = enabled
>                Maximum pattern length = 20
>    +-----------------------[detection-filter-config]------------------------------
>                memory-cap : 1048576 bytes
>    +-----------------------[rate-filter-config]-----------------------------------
>                memory-cap : 1048576 bytes
>    +-----------------------[event-filter-config]----------------------------------
>                memory-cap : 1048576 bytes
>    Rule application order:
>    pass->activation->dynamic->drop->alert->log->sdrop->reject
>    pcap DAQ configured to passive.
>    chroot
>    Set gid to 100
>    Set uid to 100
>
>
>
>    The same snort version was running just fine on FreeBSD 10.3 before the
>    upgrade.
>
>
>    /Elof
>    _______________________________________________
>    Snort-devel mailing list
>    Snort-devel at lists.snort.org
>    https://lists.snort.org/mailman/listinfo/snort-devel
>
>    Please visit http://blog.snort.org for the latest news about Snort!
>
>
>


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