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Re: Memory leak (was: Squid 3.x never_direct and DNS requests problem.)

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Hey Emmanuel,

Something is not clear to me.
Are you using url_rewrite or store_id helpers in any form?
Also what DNS lookups squid does exactly?
- Reverse
- Forward

Also:
- internal clients
- external domains

Thanks,
Eliezer

----
Eliezer Croitoru
Linux System Administrator
Mobile: +972-5-28704261
Email: eliezer@xxxxxxxxxxxx


-----Original Message-----
From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of FUSTE Emmanuel
Sent: Friday, August 18, 2017 14:53
To: Amos Jeffries <squid3@xxxxxxxxxxxxx>; squid-users@xxxxxxxxxxxxxxxxxxxxx
Subject:  Memory leak (was: Squid 3.x never_direct and DNS requests problem.)

Le 24/01/2017 à 10:55, FUSTE Emmanuel a écrit :
> Le 23/01/2017 à 23:41, Amos Jeffries a écrit :
>> On 24/01/2017 3:58 a.m., FUSTE Emmanuel wrote:
>>> All was carefully checked and nothing in my configuration (acl etc ...)
>>> explain why Squid insist to do DNS requests for requests forwarded to
>>> the peer(s).
>>>
>> <snip>
>>> #bug #4575
>>> url_rewrite_extras XXX
>>> store_id_extras XXX
>> I dont think that workaround is working.
>>
>>> ------------------------------------
>>>
>>> Since the switch from 3.5.12 to 3.5.19/23, I am able to use a simpler
>>> work around (I switched directly from 3.5.12 to 3.5.19 so I don't know
>>> when the behavior changed):
>>> Instead of installing a fake local DNS server and using
>>> dns_nameservers 127.0.0.1
>>> I could use
>>> dns_nameservers none
>>> Squid warn about non usable DNS and proceed normally. Before (tested
>>> with 3.5.12 and lower) Squid hang.
>>>
>> :-) nice.
>>
>> I'm prety sure this is still bug 4575. I've added a comment there to
>> mention how the workaround is broken, and your improved one.
>>
> Thank you !
> If there's anything I can help with to solve this bug, I'd be happy to.
>
> Emmanuel.
>

It seems that using this this workaround is a bad idea.
It expose or induce HUGE memory leak:

Current memory usage:
Pool     Obj Size    Chunks Allocated                    In
Use            Idle Allocations Saved            Rate
       (bytes)    KB/ch     obj/ch    (#)     used     free part
%Frag     (#)     (KB)     high (KB)     high (hrs) %Tot    (#)     (KB)
high (KB)     high (hrs)     %alloc    (#) (KB)     high (KB)    (#)
%cnt     %vol    (#)/sec
cbdata idns_query (6) 8696
689173     5852587 5852587     0.00     87.949     689173
5852587     5852587 0.00     100.000     0     0     0     0
0.000     0.000 0.000
mem_node                 4136 129945     524856     534368     3.85
7.887     129801 524275     534368     3.85     99.889     144
582     19715 4096894     0.873     9.316     0.003
fqdncache_entry           160 340128     53145     53145     0.00
0.799     340128 53145     53145     0.00     100.000     0     0
0     0 0.000     0.000     0.000
ipcache_entry             128 343083     42886     42886     0.00
0.644     343083 42886     42886     0.00     100.000     0     0
1     1 0.000     0.000     0.000
Short Strings              40 822953     32147     34373     0.28
0.483     819903 32028     34373     0.28     99.629     3050
120     605 247675706     52.776     5.447     0.166
cbdata generic_cbdata (14) 32
1026262     32071 32071     0.00     0.482     1026262     32071
32071 0.00     100.000     0     0     1     60     0.000     0.000 0.001
16KB Strings 16384                                        1306     20896
42624     3.15     0.314     1215     19440     42624     3.15
93.032     91     1456     13488     1976589     0.421 17.805     0.001
HttpHeaderEntry            56 372842     20390     21773     0.26
0.306     371478 20316     21773     0.26     99.634     1364     75
385 51897666     11.059     1.598     0.035
MemObject                 328 35177     11268     12032     0.27
0.169     34892     11177 12032     0.27     99.190     285     92
233     1599153 0.341     0.288     0.001
HttpReply                 280 35179     9620     10274     0.26
0.145     34893     9542 10274     0.26     99.187     286     79
199     4877844 1.039     0.751     0.003
Long Strings              512 18426     9213     9967     0.30
0.138     18176     9088 9967 0.30     98.643     250     125
203     5984528 1.275     1.685     0.004
Digest Scheme nonce's 72
109609     7707 14004     3.17     0.116     109609     7707
14004     3.17 100.000     0     0     7186     29051     0.006
0.001     0.001
Medium Strings            128 53288     6661     7158     0.26
0.100     53025     6629 7158 0.26     99.506     263     33     157
11608569 2.474     0.817     0.008
4KB Strings              4096 1104     4416     4916     0.28
0.066     1077     4308     4916 0.28     97.554     27     108
304     435808     0.093 0.981     0.000
StoreEntry                120 35177     4123     4402     0.27
0.062     34892     4089 4402 0.27     99.190     285     34     85
1599153     0.341 0.106     0.001
cbdata clientReplyContext (17)
4320                                        913     3852 5932
1.00     0.058     840     3544 5932     1.00 92.004     73     308
1047     1805429     0.385     4.288 0.001
cbdata ClientSocketContext (16)
4256                                        913     3795 5844
1.00     0.057     840     3492 5844     1.00 92.004     73     304
1031     1805429     0.385     4.225 0.001
1KB Strings              1024 3793     3793     4299     0.29
0.057     3766     3766     4299 0.29     99.288     27     27
155     421553     0.090 0.237     0.000
cbdata MemBuf (11)         64 35210     2201     2354     0.27
0.033     34920     2183 2354 0.27     99.176     290     19     48
9673363     2.061 0.340     0.006
HttpHdrCc                  96 18070     1695     1802     0.27
0.025     17940     1682 1802 0.27     99.281     130     13     43
1112930     0.237 0.059     0.001
HttpRequest              1784 913     1591     2450     1.00
0.024     840     1464     2450 1.00     92.004     73     128
433     1805487     0.385 1.771     0.001
LRU policy node            24 35104     823     878     0.26
0.012     34823     817     878 0.26     99.200     281     7     17
45784     0.010 0.001     0.000
Comm::Connection          200 4116     804     1334     3.15
0.012     3786     740     1334 3.15     91.983     330     65
201     2095512     0.447 0.230     0.001
MD5 digest                 16 35177     550     587     0.27
0.008     34892     546     587 0.27     99.190     285     5     12
1804763     0.385 0.016     0.001
cbdata Server (13)        416 1318     536     1140     3.15
0.008     1230     500     1140 3.15     93.323     88     36
346     305920     0.065 0.070     0.000
16K Buffer 16384                                        33     528
1488 1.23     0.008     17     272     1488 1.23     51.515     16
256     1040     395413     0.084     3.562     0.000
64K Buffer 65536                                        8     512
1344 3.17     0.008     1     64     1344 3.17     12.500     7 448
1344     199003     0.042     7.170     0.000
MemBlob                    48 8078     379     418     0.30
0.006     7945     373     418 0.30     98.354     133     7     40
63235417     13.475 1.669     0.042
cbdata ClientHttpRequest (15) 384
913     343     528 1.00     0.005     840     315 528     1.00
92.004     73 28     93     1805429     0.385     0.381     0.001
cbdata TunnelStateData (25) 304
894     266     405 1.84     0.004     822     245 405     1.84
91.946     72 22     74     177202     0.038     0.030     0.000
cbdata clientStreamNode (18) 128
1826     229     352 1.00     0.003     1680     210 352     1.00
92.004     146 19     62     3610290     0.769     0.254     0.002
ClientInfo                448 417     183     183     0.04     0.003
417     183     183 0.04     100.000     0     0     0     0
0.000     0.000 0.000
Auth::Digest::UserRequest 152
820     122     195 1.84     0.002     761     113 195     1.84
92.805     59 9     36     1745806     0.372     0.146     0.001
8K Buffer                8192 10     80     568     0.60     0.001
1     8     568 0.60 10.000     9     72     560     2164806
0.461     9.750 0.001
Auth::Digest::User        208 350     72     79     0.18     0.001
345     71     79 0.18     98.571     5     2     13     125838
0.027 0.014     0.000
4K Buffer                4096 13     52     124     2.55     0.001
10     40     124 2.55 76.923     3     12     84     1392001
0.297     3.135     0.001
MimeEntry                 128 177     23     23     4.42     0.000
177     23     23 4.42     100.000     0     0     0     0     0.000
0.000 0.000
2K Buffer                2048 10     20     68     2.25     0.000
5     10     68     2.25 50.000     5     10     62     15326460
3.266     17.257 0.010
AuthUserIP                 64 306     20     21     0.20     0.000
306     20     21 0.20     100.000     0     0     2     2     0.000
0.000 0.000
NotePairs::Entry           48 399     19     35     0.31     0.000
338     16     35 0.31     84.712     61     3     9     4729264
1.008 0.125     0.003
acl_proxy_auth_match_cache 40
306     12     13 0.20     0.000     306     12     13     0.20
100.000     0 0     2     2     0.000     0.000     0.000
cbdata HttpStateData (29) 320
33     11     30 1.23     0.000     17     6     30     1.23
51.515     16 5     21     337305     0.072     0.059     0.000
AuthUserHashPointer        24 344     9     9     0.20     0.000
344     9     9     0.20 100.000     0     0     1     0     0.000
0.000     0.000
cbdata store_client (22) 160
37     6     15 1.23     0.000     19     3     15     1.23
51.351     18 3     11     1665410     0.355     0.146     0.001
cbdata FwdState (28)      176 33     6     17     1.23     0.000
17     3     17     1.23 51.515     16     3     12     337300
0.072     0.033     0.000
cbdata IdleConnList (30) 4160
1     5     5 4.41     0.000     1     5     5     4.41     100.000
0 0     5     9196     0.002     0.021     0.000
netdbEntry                168 17     3     3     0.27     0.000
17     3     3     0.27 100.000     0     0     0     0     0.000
0.000     0.000
cbdata helper_server (24) 240
10     3     3 2.63     0.000     10     3     3     2.63
100.000     0 0     0     0     0.000     0.000     0.000
Acl::AndNode              160 13     3     3     4.42     0.000
13     3     3     4.42 100.000     0     0     0     0     0.000
0.000     0.000
cbdata ACLFilledChecklist (20)
456                                        4     2     6 2.63
0.000     1     1     6     2.63     25.000     3     2 6
2917323     0.622     0.731     0.002
cbdata Tree (3)           216 6     2     2     4.42     0.000     6
2     2     4.42 100.000     0     0     0     0     0.000     0.000
0.000
cbdata CachePeer (4)      872 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ev_entry                   48 16     1     2     0.49     0.000
11     1     2     0.49 68.750     5     1     2     43525     0.009
0.001     0.000
net_db_name                32 21     1     1     0.27     0.000
21     1     1     0.27 100.000     0     0     0     0     0.000
0.000     0.000
acl_ip_data                96 7     1     1     4.42     0.000     7
1     1     4.42 100.000     0     0     1     4     0.000     0.000
0.000
HttpHdrScTarget            88 7     1     1     0.19     0.000     7
1     1     0.19 100.000     0     0     1     73     0.000
0.000     0.000
cbdata BodyPipe (32)      152 4     1     4     0.76     0.000     1
1     4     0.76 25.000     3     1     4     33979     0.007
0.003     0.000
cbdata ConnOpener (27) 136                                        4
1     4 0.49     0.000     0     0     4     0.49     0.000     4     1
4     250616     0.053     0.019     0.000
cbdata ClientRequestContext (19)
104                                        5     1     4 0.60
0.000     0     0     4     0.60     0.000     5     1 4     1827236
0.389     0.104     0.001
ACLStrategised            160 3     1     1     4.42     0.000     3
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
cbdata CbDataList (1) 40                                        12
1     1 4.42     0.000     12     1     1     4.42     100.000     0
0     0     0     0.000     0.000     0.000
ACLSourceIP               144 3     1     1     4.42     0.000     3
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
cbdata Logfile (9)        352 1     1     1     3.75     0.000     1
1     1     3.75 100.000     0     0     1     0     0.000     0.000
0.000
ACLStringData              56 6     1     1     4.42     0.000     6
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
wordlist                   16 21     1     4     4.42     0.000
21     1     4     4.42 100.000     0     0     4     18     0.000
0.000     0.000
ACLStrategised            160 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
Acl::NotNode              160 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLRegexData               16 18     1     1     4.42     0.000
18     1     1     4.42 100.000     0     0     0     0     0.000
0.000     0.000
RegexList                  88 3     1     1     4.42     0.000     3
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLUserData                64 4     1     1     4.42     0.000     4
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
cbdata ps_state (26)      256 1     1     1     4.41     0.000     0
0     1     4.41 0.000     1     1     1     543789     0.116
0.077     0.000
cbdata ErrorState (21) 232                                        1
1     1 1.91     0.000     0     0     1     1.91     0.000     1     1
1     1271537     0.271     0.162     0.001
cbdata TcpAcceptor (12) 104                                        2
1     1 4.42     0.000     2     1     1     4.42     100.000     0
0     0     0     0.000     0.000     0.000
cbdata CbDataList (33) 96                                        2
1     3     1.34 0.000     0     0     3     1.34     0.000     2
1     3 738165     0.157     0.039     0.000
cbdata helper (7)         168 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLStrategised            160 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLProxyAuth              152 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLDestinationIP          144 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
cbdata StateData (23) 48                                        3
1     1     2.63 0.000     0     0     1     2.63     0.000     3
1     1 1155036     0.246     0.030     0.001
Helper::Request            48 3     1     1     2.63     0.000     0
0     1     2.63 0.000     3     1     1     1155036     0.246
0.030     0.001
HttpHdrSc                  16 7     1     1     0.19     0.000     7
1     1     0.19 100.000     0     0     1     73     0.000
0.000     0.000
cbdata RemovalPolicy (10) 104
1     1     1 4.42     0.000     1     1     1     4.42     100.000
0 0     0     0     0.000     0.000     0.000
ACLHTTPHeaderData          48 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
FwdServer                  24 3     1     1     4.41     0.000     0
0     1     4.41 0.000     3     1     1     1631367     0.348
0.022     0.001
cbdata RemovalPurgeWalker (34) 72
1     1     1     4.17 0.000     0     0     1     4.17     0.000
1     1     1 6250     0.001     0.000     0.000
cbdata CbDataList (2) 64                                        1
1     1     4.42 0.000     1     1     1     4.42     100.000     0
0     0 0     0.000     0.000     0.000
ACLNoteData                40 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
CacheDigest                40 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLDomainData              16 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLHierCodeData            32 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLMethodData              16 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLTimeData                32 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
ACLASN                     16 2     1     1     4.42     0.000     2
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
HttpHdrRange               32 1     1     1     2.85     0.000     0
0     1     2.85 0.000     1     1     1     7768     0.002
0.000     0.000
ACLProtocolData            16 1     1     1     4.42     0.000     1
1     1     4.42 100.000     0     0     0     0     0.000     0.000
0.000
HttpHdrRangeSpec           16 1     1     1     2.85     0.000     0
0     1     2.85 0.000     1     1     1     7768     0.002
0.000     0.000
32K Buffer 32768                                        0     0     96
4.28     0.000     0     0     96     4.28     -1.000     0 0     96
534     0.000     0.010     0.000
dlink_node                 24 0     0     1     4.41     0.000     0
0     1     4.41 -1.000     0     0     1     7     0.000     0.000
0.000
HttpHdrContRange           24 0     0     1     3.76     0.000     0
0     1     3.76 -1.000     0     0     1     657     0.000
0.000     0.000
cbdata netdbExchangeState (31)
4176                                        0     0     5 4.41
0.000     0     0     5     4.41     -1.000     0     0 5     0
0.000     0.000     0.000
cbdata StatObjectsState (35) 48
0     0     1     0.14 0.000     0     0     1     0.14     -1.000
0     0     1 1     0.000     0.000     0.000
cbdata StoreSearchHashIndex (36)
104                                        0     0     1 0.14
0.000     0     0     1     0.14     -1.000     0     0 1     1
0.000     0.000     0.000
Total                       1 4164421     6654528     6654528
0.00     100.000     4156051 6650022     6650022     0.00     99.932
8370     4506 27047     461504099     98.340     95.012     0.312
Cumulative allocated volume: 181.888 GB
Current overhead: 34740 bytes (0.001%)
Idle pool limit: 5.00 MB
Total Pools created: 111
Pools ever used:     102 (shown above)
Currently in use:    85
String Pool     Impact
       (%strings)     (%volume)
Short Strings            91     42
Medium Strings           6     9
Long Strings             2     12
1KB Strings              0     5
4KB Strings              0     6
16KB Strings             0     26
Other Strings            0     1

Large buffers: 0 (0 KB)

A special/real "dns_nameservers none" handling need to be implemented.
So I'm back with fake local DNS server.
We will see if my Squid instances will survive more than 8h with that.

Emmanuel.

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