[Pacemaker] Pacemaker still may include memory leaks
Yuichi SEINO
seino.cluster2 at gmail.com
Wed May 29 04:39:19 EDT 2013
2013/5/29 Andrew Beekhof <andrew at beekhof.net>:
>
> On 28/05/2013, at 4:30 PM, Andrew Beekhof <andrew at beekhof.net> wrote:
>
>>
>> On 28/05/2013, at 10:12 AM, Andrew Beekhof <andrew at beekhof.net> wrote:
>>
>>>
>>> On 27/05/2013, at 5:08 PM, Vladislav Bogdanov <bubble at hoster-ok.com> wrote:
>>>
>>>> 27.05.2013 04:20, Yuichi SEINO wrote:
>>>>> Hi,
>>>>>
>>>>> 2013/5/24 Vladislav Bogdanov <bubble at hoster-ok.com>:
>>>>>> 24.05.2013 06:34, Andrew Beekhof wrote:
>>>>>>> Any help figuring out where the leaks might be would be very much appreciated :)
>>>>>>
>>>>>> One (and the only) suspect is unfortunately crmd itself.
>>>>>> It has private heap grown from 2708 to 3680 kB.
>>>>>>
>>>>>> All other relevant differences are in qb shm buffers, which are
>>>>>> controlled and may grow until they reach configured size.
>>>>>>
>>>>>> @Yuichi
>>>>>> I would recommend to try running under valgrind on a testing cluster to
>>>>>> figure out is that a memleak (lost memory) or some history data
>>>>>> (referenced memory). Latter may be a logical memleak though. You may
>>>>>> look in /etc/sysconfig/pacemaker for details.
>>>>>
>>>>> I got valgrind for about 2 days. And, I attached valgrind in ACT node
>>>>> and SBY node.
>>>>
>>>>
>>>> I do not see any "direct" memory leaks (repeating 'definitely-lost'
>>>> allocations) there.
>>>>
>>>> So what we see is probably one of:
>>>> * Cache/history/etc, which grows up to some limit (or expired at the
>>>> some point in time).
>>>> * Unlimited/not-expirable lists/hashes of data structures, which are
>>>> correctly freed at exit
>>>
>>> There is still plenty of memory chunks not free'd at exit, I'm slowly working through those.
>>
>> I've pushed the following to my repo:
>>
>> + Andrew Beekhof (2 hours ago) d070092: Test: More glib suppressions
>> + Andrew Beekhof (2 hours ago) ec74bf0: Fix: Fencing: Ensure API object is consistently free'd
>> + Andrew Beekhof (2 hours ago) 6130d23: Fix: Free additional memory at exit
>> + Andrew Beekhof (2 hours ago) b76d6be: Refactor: crmd: Allocate a mainloop before doing anything to help valgrind
>> + Andrew Beekhof (3 hours ago) d4041de: Log: init: Remove unnecessary detail from shutdown message
>> + Andrew Beekhof (3 hours ago) 282032b: Fix: Clean up internal mainloop structures at exit
>> + Andrew Beekhof (4 hours ago) 0947721: Fix: Core: Correctly unreference GSource inputs
>> + Andrew Beekhof (25 hours ago) d94140d: Fix: crmd: Clean up more memory before exit
>> + Andrew Beekhof (25 hours ago) b44257c: Test: cman: Ignore additional valgrind errors
>>
>> If someone would like to run the cluster (no valgrind needed) for a while with
>>
>> export PCMK_trace_functions=mainloop_gio_destroy,mainloop_add_fd,mainloop_del_fd,crmd_exit,crm_peer_destroy,empty_uuid_cache,lrm_state_destroy_all,internal_lrm_state_destroy,do_stop,mainloop_destroy_trigger,mainloop_setup_trigger,do_startup,stonith_api_delete
>>
>> and then (after grabbing smaps) shut it down, we should have some information about any lists/hashes that are growing too large.
>>
>> Also, be sure to run with:
>>
>> export G_SLICE=always-malloc
>>
>> which will prevent glib from accumulating pools of memory and distorting any results.
>
>
> I did this today with 2747e25 and it looks to me like there is no leak (anymore?)
> For context, between smaps.5 and smaps.6, the 4 node cluster ran over 120 "standby" tests (lots of PE runs and resource activity).
> So unless someone can show me otherwise, I'm going to move on :)
I see. I also want to test a leak. I will report the result after the test.
>
> Note that the [heap] changes are actually the memory usage going _backwards_.
>
> Raw results below.
>
> [root at corosync-host-1 ~]# cat /proc/`pidof crmd`/smaps > smaps.6 ; diff -u smaps.5 smaps.6;
> --- smaps.5 2013-05-29 02:39:25.032940230 -0400
> +++ smaps.6 2013-05-29 03:48:51.278940819 -0400
> @@ -40,16 +40,16 @@
> Swap: 0 kB
> KernelPageSize: 4 kB
> MMUPageSize: 4 kB
> -0226b000-02517000 rw-p 00000000 00:00 0 [heap]
> -Size: 2736 kB
> -Rss: 2268 kB
> -Pss: 2268 kB
> +0226b000-02509000 rw-p 00000000 00:00 0 [heap]
> +Size: 2680 kB
> +Rss: 2212 kB
> +Pss: 2212 kB
> Shared_Clean: 0 kB
> Shared_Dirty: 0 kB
> Private_Clean: 0 kB
> -Private_Dirty: 2268 kB
> -Referenced: 2268 kB
> -Anonymous: 2268 kB
> +Private_Dirty: 2212 kB
> +Referenced: 2212 kB
> +Anonymous: 2212 kB
> AnonHugePages: 0 kB
> Swap: 0 kB
> KernelPageSize: 4 kB
> @@ -112,13 +112,13 @@
> MMUPageSize: 4 kB
> 7f0c6e918000-7f0c6ee18000 rw-s 00000000 00:10 522579 /dev/shm/qb-pengine-event-27411-27412-6-data
> Size: 5120 kB
> -Rss: 3572 kB
> -Pss: 1785 kB
> +Rss: 4936 kB
> +Pss: 2467 kB
> Shared_Clean: 0 kB
> -Shared_Dirty: 3572 kB
> +Shared_Dirty: 4936 kB
> Private_Clean: 0 kB
> Private_Dirty: 0 kB
> -Referenced: 3572 kB
> +Referenced: 4936 kB
> Anonymous: 0 kB
> AnonHugePages: 0 kB
> Swap: 0 kB
> @@ -841,7 +841,7 @@
> 7f0c72b00000-7f0c72b1d000 r-xp 00000000 fd:00 119 /lib64/libselinux.so.1
> Size: 116 kB
> Rss: 36 kB
> -Pss: 5 kB
> +Pss: 4 kB
> Shared_Clean: 36 kB
> Shared_Dirty: 0 kB
> Private_Clean: 0 kB
> @@ -1401,7 +1401,7 @@
> 7f0c740c6000-7f0c74250000 r-xp 00000000 fd:00 45 /lib64/libc-2.12.so
> Size: 1576 kB
> Rss: 588 kB
> -Pss: 20 kB
> +Pss: 19 kB
> Shared_Clean: 588 kB
> Shared_Dirty: 0 kB
> Private_Clean: 0 kB
>
>
>>
>>
>>> Once we know all memory is being cleaned up, the next step is to check the size of things beforehand.
>>>
>>> I'm hoping one or more of them show up as unnaturally large, indicating things are being added but not removed.
>>>
>>>> (f.e like dlm_controld has(had???) for a
>>>> debugging buffer or like glibc resolver had in EL3). This cannot be
>>>> caught with valgrind if you use it in a standard way.
>>>>
>>>> I believe we have former one. To prove that, it would be very
>>>> interesting to run under valgrind *debugger* (--vgdb=yes|full) for some
>>>> long enough (2-3 weeks) period of time and periodically get memory
>>>> allocation state from there (with 'monitor leak_check full reachable
>>>> any' gdb command). I wanted to do that a long time ago, but
>>>> unfortunately did not have enough spare time to even try that (although
>>>> I tried to valgrind other programs that way).
>>>>
>>>> This is described in valgrind documentation:
>>>> http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.gdbserver
>>>>
>>>> We probably do not need to specify '--vgdb-error=0' because we do not
>>>> need to install watchpoints at the start (and we do not need/want to
>>>> immediately connect to crmd with gdb to tell it to continue), we just
>>>> need to periodically get status of memory allocations
>>>> (stop-leak_check-cont sequence). Probably that should be done in a
>>>> 'fast' manner, so crmd does not stop for a long time, and the rest of
>>>> pacemaker does not see it 'hanged'. Again, I did not try that, and I do
>>>> not know if it's even possible to do that with crmd.
>>>>
>>>> And, as pacemaker heavily utilizes glib, which has own memory allocator
>>>> (slices), it is better to switch it to a 'standard' malloc/free for
>>>> debugging with G_SLICE=always-malloc env var.
>>>>
>>>> Last, I did memleak checks for a 'static' (i.e. no operations except
>>>> monitors are performed) cluster for ~1.1.8, and did not find any. It
>>>> would be interesting to see if that is true for an 'active' one, which
>>>> starts/stops resources, handles failures, etc.
>>>>
>>>>>
>>>>> Sincerely,
>>>>> Yuichi
>>>>>
>>>>>>
>>>>>>>
>>>>>>> Also, the measurements are in pages... could you run "getconf PAGESIZE" and let us know the result?
>>>>>>> I'm guessing 4096 bytes.
>>>>>>>
>>>>>>> On 23/05/2013, at 5:47 PM, Yuichi SEINO <seino.cluster2 at gmail.com> wrote:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> I retry the test after we updated packages to the latest tag and OS.
>>>>>>>> glue and booth is latest.
>>>>>>>>
>>>>>>>> * Environment
>>>>>>>> OS:RHEL 6.4
>>>>>>>> cluster-glue:latest(commit:2755:8347e8c9b94f) +
>>>>>>>> patch[detail:http://www.gossamer-threads.com/lists/linuxha/dev/85787]
>>>>>>>> resource-agent:v3.9.5
>>>>>>>> libqb:v0.14.4
>>>>>>>> corosync:v2.3.0
>>>>>>>> pacemaker:v1.1.10-rc2
>>>>>>>> crmsh:v1.2.5
>>>>>>>> booth:latest(commit:67e1208973de728958432aaba165766eac1ce3a0)
>>>>>>>>
>>>>>>>> * Test procedure
>>>>>>>> we regularly switch a ticket. The previous test also used the same way.
>>>>>>>> And, There was no a memory leak when we tested pacemaker-1.1 before
>>>>>>>> pacemaker use libqb.
>>>>>>>>
>>>>>>>> * Result
>>>>>>>> As a result, I think that crmd may cause the memory leak.
>>>>>>>>
>>>>>>>> crmd smaps(a total of each addresses)
>>>>>>>> In detail, we attached smaps of start and end. And, I recorded smaps
>>>>>>>> every 1 minutes.
>>>>>>>>
>>>>>>>> Start
>>>>>>>> RSS: 7396
>>>>>>>> SHR(Shared_Clean+Shared_Dirty):3560
>>>>>>>> Private(Private_Clean+Private_Dirty):3836
>>>>>>>>
>>>>>>>> Interbal(about 30h later)
>>>>>>>> RSS:18464
>>>>>>>> SHR:14276
>>>>>>>> Private:4188
>>>>>>>>
>>>>>>>> End(about 70h later)
>>>>>>>> RSS:19104
>>>>>>>> SHR:14336
>>>>>>>> Private:4768
>>>>>>>>
>>>>>>>> Sincerely,
>>>>>>>> Yuichi
>>>>>>>>
>>>>>>>> 2013/5/15 Yuichi SEINO <seino.cluster2 at gmail.com>:
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> I ran the test for about two days.
>>>>>>>>>
>>>>>>>>> Environment
>>>>>>>>>
>>>>>>>>> OS:RHEL 6.3
>>>>>>>>> pacemaker-1.1.9-devel (commit 138556cb0b375a490a96f35e7fbeccc576a22011)
>>>>>>>>> corosync-2.3.0
>>>>>>>>> cluster-glue latest+patch(detail:http://www.gossamer-threads.com/lists/linuxha/dev/85787)
>>>>>>>>> libqb- 0.14.4
>>>>>>>>>
>>>>>>>>> There may be a memory leak in crmd and lrmd. I regularly got rss of ps.
>>>>>>>>>
>>>>>>>>> start-up
>>>>>>>>> crmd:5332
>>>>>>>>> lrmd:3625
>>>>>>>>>
>>>>>>>>> interval(about 30h later)
>>>>>>>>> crmd:7716
>>>>>>>>> lrmd:3744
>>>>>>>>>
>>>>>>>>> ending(about 60h later)
>>>>>>>>> crmd:8336
>>>>>>>>> lrmd:3780
>>>>>>>>>
>>>>>>>>> I still don't run a test that pacemaker-1.1.10-rc2 use. So, I will run its test.
>>>>>>>>>
>>>>>>>>> Sincerely,
>>>>>>>>> Yuichi
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Yuichi SEINO
>>>>>>>>> METROSYSTEMS CORPORATION
>>>>>>>>> E-mail:seino.cluster2 at gmail.com
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Yuichi SEINO
>>>>>>>> METROSYSTEMS CORPORATION
>>>>>>>> E-mail:seino.cluster2 at gmail.com
>>>>>>>> <smaps_log.tar.gz>_______________________________________________
>>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>>
>>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>>
>>>>>>> Project Home: http://www.clusterlabs.org
>>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>>
>>>>>> Project Home: http://www.clusterlabs.org
>>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Yuichi SEINO
>>>>> METROSYSTEMS CORPORATION
>>>>> E-mail:seino.cluster2 at gmail.com
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>>
>>>>> Project Home: http://www.clusterlabs.org
>>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>>> Bugs: http://bugs.clusterlabs.org
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Pacemaker mailing list: Pacemaker at oss.clusterlabs.org
>>>> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>>>>
>>>> Project Home: http://www.clusterlabs.org
>>>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>>>> Bugs: http://bugs.clusterlabs.org
>>>
>>
>
>
> _______________________________________________
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> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
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> Bugs: http://bugs.clusterlabs.org
--
Yuichi SEINO
METROSYSTEMS CORPORATION
E-mail:seino.cluster2 at gmail.com
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