title: IOS 6, crash with low memory warning
body: <p>My apps, after upgrading to IOS 6.0 keeps on crashing. In the console, it shows low memory warning, this won't happen in IOS 4, and IOS 5... I am using ARC. I try to look at the crash report but tell me nothing,here it is</p>
  
  <pre><code>=============================================
  Incident Identifier: 06CF58AA-4C1A-4CA3-A522-F44881E8D301
  CrashReporter Key:   69ed28238a860bdf99a77524c1b4b029516122e1
  Hardware Model:      iPod4,1
  OS Version:          iPhone OS 6.0 (10A403)
  Kernel Version:      Darwin Kernel Version 13.0.0: Sun Aug 19 00:27:34 PDT 2012; root:xnu-2107.2.33~4/RELEASE_ARM_S5L8930X
  Date:                2012-10-06 20:57:43 +0800
  Time since snapshot: 63 ms
  
  Free pages:        318
  Active pages:      1626
  Inactive pages:    1057
  Throttled pages:   44479
  Purgeable pages:   5
  Wired pages:       15989
  Largest process:   MJClub
  
  Processes
       Name                    &lt;UUID&gt;                       rpages       recent_max       [reason]          (state)
  
        MobileMail &lt;bff817c61ce33c85a43ea9a6c98c29f5&gt;         1053             1053         [vm]         (resume) (continuous)
       MobilePhone &lt;3fca241f2a193d0fb8264218d296ea41&gt;          996              996         [vm]         (resume) (continuous)
              tccd &lt;eb5ddcf533663f8d987d67cae6a4c4ea&gt;          161              161         [vm]         (daemon)
            MJClub &lt;ab7b5723f2023289927f68004c99544b&gt;        17907            17907         [vm]         (frontmost) (resume)
              ptpd &lt;04a56fce67053c57a7979aeea8e5a7ea&gt;          588              588                      (daemon)
      mediaserverd &lt;80657170daca32c9b8f3a6b1faac43a2&gt;          442              442                      (daemon)
           syslogd &lt;cbef142fa0a839f0885afb693fb169c3&gt;          148              148                      (daemon)
        aosnotifyd &lt;d4d14f2914c3343796e447cfef3e6542&gt;          434              434                      (daemon)
       dataaccessd &lt;2a3f6a518f3f3646bf35eddd36f25005&gt;         1347             1347                      (daemon)
     iaptransportd &lt;f784f30dc09d32078d87b450e8113ef6&gt;          213              213                      (daemon)
         locationd &lt;892cd1c9ffa43c99a82dba197be5f09e&gt;          701              701                      (daemon)
             wifid &lt;9472b090746237998cdbb9b34f090d0c&gt;          297              297                      (daemon)
       SpringBoard &lt;27372aae101f3bbc87804edc10314af3&gt;         2462             2462                     
        backboardd &lt;5037235f295b33eda98eb5c72c098858&gt;         3475             3475                      (daemon)
           configd &lt;4245d73a9e96360399452cf6b8671844&gt;          368              368                      (daemon)
     fairplayd.N81 &lt;335829f71dcd315fae46a042918d4716&gt;          145              145                      (daemon)
         fseventsd &lt;996cc4ca03793184aea8d781b55bce08&gt;          317              317                      (daemon)
           imagent &lt;1e68080947be352590ce96b7a1d07b2f&gt;          353              353                      (daemon)
     mDNSResponder &lt;3e557693f3073697a58da6d27a827d97&gt;          204              204                      (daemon)
         lockdownd &lt;ba1358c7a8003f1b91af7d5f58dd5bbe&gt;          266              266                      (daemon)
            powerd &lt;2d2ffed5e69638aeba1b92ef124ed861&gt;          144              144                      (daemon)
    UserEventAgent &lt;6edfd8d8dba23187b05772dcdfc94f90&gt;          431              431                      (daemon)
       debugserver &lt;185719f06f1631d4922c652bdd4c8529&gt;            0                0                      (daemon)
  springboardservi &lt;ff6f64b3a21a39c9a1793321eefa5304&gt;            0                0                      (daemon)
      syslog_relay &lt;45e9844605d737a08368b5215bb54426&gt;            0                0                      (daemon)
        DTMobileIS &lt;23303ca402aa3705870b01a9047854ea&gt;            0                0                      (daemon)
      syslog_relay &lt;45e9844605d737a08368b5215bb54426&gt;            0                0                      (daemon)
  notification_pro &lt;845b7beebc8538ca9ceef731031983b7&gt;          131              131                      (daemon)
              afcd &lt;b0aff2e7952e34a9882fec81a8dcdbb2&gt;          136              136                      (daemon)
  filecoordination &lt;fbab576f37a63b56a1039153fc1aa7d8&gt;          122              122                      (daemon)
         distnoted &lt;a89af76ec8633ac2bbe99bc2b7964bb0&gt;          106              106                      (daemon)
              apsd &lt;94d8051dd5f5362f82d775bc279ae608&gt;          316              316                      (daemon)
          networkd &lt;0032f46009f53a6c80973fe153d1a588&gt;          159              159                      (daemon)
        aggregated &lt;8c3c991dc4153bc38aee1e841864d088&gt;           94               94                      (daemon)
          BTServer &lt;c92fbd7488e63be99ec9dbd05824f5e5&gt;          300              300                      (daemon)
         securityd &lt;dafed6d6d9843902a4a215ae04b0b530&gt;          156              156                      (daemon)
           notifyd &lt;51c0e03da8a93ac8a595442fcaac531f&gt;          155              155                      (daemon)
  
  **End**
  ===========================================================
  </code></pre>
  
  <p>I don't know much about instrument, but I also take a look at it and here is some data from instrument</p>
  
  <p>By using Activity Monitor</p>
  
  <ul>
  <li><p>Virtual Mem=219M</p></li>
  <li><p>Real Mem= 32M</p></li>
  </ul>
  
  <p>By using Allocation </p>
  
  <ul>
  <li><p>Live Byte = 2.5M (Crash at around 2.5M)</p></li>
  <li><p>By using Leak</p></li>
  </ul>
  
  <p>No Leak found when take away admob</p>
  
  <p>a little leak found when using admob, but i think it is not significant</p>
  
  <p>By using VMTracker</p>
  
  <ul>
  <li><p>Resident Size=82.43MB</p></li>
  <li><p>Dirty Size=40MB in the beginning, but increase to 72MB, and keeps on receive low memory warning and crash, if I don't use admob, the apps can run for over 1 hours without any problem.</p></li>
  </ul>
  
  <p>For admob I am using the latest 6.2.0, I've try to use mediation id/publisher id, both give the same result. using 6.0.1 gives the same  result.</p>
  
  <p>I've also replace admob with other ad(e.g. inmobi) it will last longer, but still crash sometimes (10min from startup)</p>
  
  <p>Please any one can give me any idea on this issue? This crash only happened in IOS6, in IOS5 everything is fine. Once again I am using ARC.</p>