CorePlot silent crash (possibly from scaleToFitPlots:)

I have an iPhone app with a CorePlot graph. I have a button placed next to the graph which calls scaleToFitPlots: on the graph when pressed.

The problem is that sometimes my app crashes when scaleToFitPlots: is called.

Most of the time there are no console messages and usually no debugger messages but rarely there is the following repeated about ten times

warning: Unable to restore previously selected frame.

There is usually no stack trace for the crashed thread but sometimes it is

0 <????>

or

0 -[CPGradient newAxialGradientInRect:]
1 <????>

One of the crash reports:

Incident Identifier: 4F9B520F-14A9-460F-A47D-93662C41D80A
CrashReporter Key:   d83f6beafd9d721fc55a6cda5eb9b2926b753649
Hardware Model:      iPad2,1
Process:         IQ [297]
Path:            /var/mobile/Applications/18468A8B-79C8-42FA-A597-141CC91E54F2/IQ.app/IQ
Identifier:      IQ
Version:         ??? (???)
Code Type:       ARM (Native)
Parent Process:  launchd [1]

Date/Time:       2011-07-20 15:53:48.420 -0700
OS Version:      iPhone OS 4.3.3 (8J2)
Report Version:  104

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x002fc080
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   ???                             0x002fc080 0 + 3129472
1   ???                             0xfffffff8 0 + -8

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib          0x35590fbc kevent + 24
1   libdispatch.dylib               0x3525bed4 _dispatch_mgr_invoke + 744
2   libdispatch.dylib               0x3525cf3a _dispatch_queue_invoke + 70
3   libdispatch.dylib               0x3525c4ec _dispatch_worker_thread2 + 228
4   libsystem_c.dylib               0x3566758a _pthread_wqthread + 258
5   libsystem_c.dylib               0x35667bbc start_wqthread + 0

Thread 2 name:  WebThread
Thread 2:
0   libsystem_kernel.dylib          0x3558dc00 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x3558d758 mach_msg + 44
2   CoreFoundation                  0x309582b8 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                  0x3095a562 __CFRunLoopRun + 350
4   CoreFoundation                  0x308eaebc CFRunLoopRunSpecific + 224
5   CoreFoundation                  0x308eadc4 CFRunLoopRunInMode + 52
6   WebCore                         0x35f5327e RunWebThread(void*) + 382
7   libsystem_c.dylib               0x3566630a _pthread_start + 242
8   libsystem_c.dylib               0x35667bb4 thread_start + 0

Thread 3:
0   libsystem_kernel.dylib          0x355903ec __workq_kernreturn + 8
1   libsystem_c.dylib               0x356676d8 _pthread_wqthread + 592
2   libsystem_c.dylib               0x35667bbc start_wqthread + 0

Thread 0 crashed with ARM Thread State:
    r0: 0x00000001    r1: 0x0000000f      r2: 0x2fdfdae0      r3: 0x0000002f
    r4: 0x0650d740    r5: 0x2fdfdb30      r6: 0x005e7460      r7: 0x00c8a0d2
    r8: 0xd7400000    r9: 0x2fdfdaf4     r10: 0x7c852fdf     r11: 0xdb400004
    ip: 0x00000000    sp: 0x2fdfdb10      lr: 0x33325e15      pc: 0x002fc080
  cpsr: 0x600f0010

Binary Images:
    0x1000 -    0x80fff +IQ armv7  <42c4cbc572a73bce9d0d2098320d61a0> /var/mobile/Applications/18468A8B-79C8-42FA-A597-141CC91E54F2/IQ.app/IQ
  0x18e000 -   0x192fff  AccessibilitySettingsLoader armv7  <977d3eb9b0a4389e85e0e8eb64806759> /System/Library/AccessibilityBundles/AccessibilitySettingsLoader.bundle/AccessibilitySettingsLoader
  0x199000 -   0x19afff  MessageUIFramework armv7  <f6e37d6cad443d26919fc74e9a2b2d80> /System/Library/AccessibilityBundles/MessageUIFramework.axbundle/MessageUIFramework
  0x1a0000 -   0x1a0fff  QuickLook armv7  <6efbee38273d326b817693da9b454da1> /System/Library/AccessibilityBundles/QuickLook.axbundle/QuickLook
  0x1a3000 -   0x1a5fff  AddressBookUIFramework armv7  <bf6df3e4925f308d86393a98ad6bdb8b> /System/Library/AccessibilityBundles/AddressBookUIFramework.axbundle/AddressBookUIFramework
  0x1e0000 -   0x1e2fff +libXcodeDebuggerSupport.dylib armv7  <f1fd9f6fee863b6699562fa6207447f2> /Developer/usr/lib/libXcodeDebuggerSupport.dylib
 0x34de000 -  0x3518fff  UIKit armv7  <5a81f85811d035d988a9dbd89a79fb7b> /System/Library/AccessibilityBundles/UIKit.axbundle/UIKit
0x2fe00000 - 0x2fe25fff  dyld armv7  <bb9bfc7d242331d29a79adf7ef7aaa18> /usr/lib/dyld
0x3062a000 - 0x30635fff  libz.1.dylib armv7  <ac706bee36593dc683fd5a96a389d72e> /usr/lib/libz.1.dylib
0x3064b000 - 0x3064ffff  AssetsLibraryServices armv7  <e1cbfe599c96369ca4bdb0dd99d3cd9f> /System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices
0x30681000 - 0x306a1fff  MobileSync armv7  <4df400c4559435889eccd88db77a110c> /System/Library/PrivateFrameworks/MobileSync.framework/MobileSync
0x306c0000 - 0x306ccfff  SpringBoardServices armv7  <c68262667ac8397a949ce4e92dfec7db> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices
0x306ce000 - 0x3072dfff  libBLAS.dylib armv7  <0b36b2272aa33a8c9aa22d99c89d7189> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib
0x307a0000 - 0x307a2fff  IOMobileFramebuffer armv7  <683f321680763e519d61541170ba2133> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer
0x307a3000 - 0x308bdfff  libicucore.A.dylib armv7  <bada0c2725bb31a483d5adf9aaf1f8df> /usr/lib/libicucore.A.dylib
0x30966000 - 0x30cf3fff  UIKit armv7  <c271b78464d93cb7bf28c6e49df293ba> /System/Library/Frameworks/UIKit.framework/UIKit
0x30cf4000 - 0x30cf6fff  CrashReporterSupport armv7  <9e7efa009730322f84bbc5d8bf1ded94> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport
0x30d91000 - 0x3107efff  libLAPACK.dylib armv7  <b855d60dac01310495453bddfd004f0d> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib
0x31182000 - 0x31185fff  ActorKit armv7  <f7aa6cdd654231988aafcf448978f450> /System/Library/PrivateFrameworks/ActorKit.framework/ActorKit
0x311a9000 - 0x311ddfff  VideoToolbox armv7  <570c63dc3a273a5a8c9072fd5567f5c1> /System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox
0x311e1000 - 0x3120ffff  DataAccess armv7  <3a2e67aa1d8834b7a8fc2fbb56654b15> /System/Library/PrivateFrameworks/DataAccess.framework/DataAccess
0x31253000 - 0x312f0fff  AddressBookUI armv7  <e354aeb3d96e30338e90cc3638ffe81b> /System/Library/Frameworks/AddressBookUI.framework/AddressBookUI
0x312f1000 - 0x312fdfff  GraphicsServices armv7  <ff78a9636e933f0dbd222f8d26209788> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x32e0c000 - 0x32e6bfff  CorePDF armv7  <f198f0d47ade34699ed5cb93226f46bb> /System/Library/PrivateFrameworks/CorePDF.framework/CorePDF
0x32e85000 - 0x32ea5fff  PrintKit armv7  <e5a01ca9083a36afacc08611a398e2ad> /System/Library/PrivateFrameworks/PrintKit.framework/PrintKit
0x32ea6000 - 0x32ed9fff  AppSupport armv7  <0217468bd9f839229a47910b7816b3d5> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport
0x32edc000 - 0x32edefff  MailServices armv7  <74ae0145ef713c6d91fd8f68885b0a61> /System/Library/PrivateFrameworks/MailServices.framework/MailServices
0x32edf000 - 0x32ee4fff  liblaunch.dylib armv7  <f5ccc8234aea3ebd9a88bd37f0fa23ae> /usr/lib/system/liblaunch.dylib
0x32efe000 - 0x32f0bfff  libdispatch.dylib armv7  <9a0511ad5ebc3db898f1f49ed1a73d34> /usr/lib/system/libdispatch.dylib
0x32f13000 - 0x32f18fff  libnotify.dylib armv7  <9d7198e91de9386a9e5ea43608a66a57> /usr/lib/system/libnotify.dylib
0x32f30000 - 0x32fc5fff  ImageIO armv7  <d520e3241d1130e8ac1375ee0f2c1095> /System/Library/Frameworks/ImageIO.framework/ImageIO
0x33060000 - 0x33065fff  libcopyfile.dylib armv7  <e57c2b9054b831d9a37119baaa4947cb> /usr/lib/system/libcopyfile.dylib
0x330bf000 - 0x330bffff  libdnsinfo.dylib armv7  <21415179ffa03f949fa8cc851c6c31c7> /usr/lib/system/libdnsinfo.dylib
0x330eb000 - 0x331affff  libobjc.A.dylib armv7  <6b51e76fde9f381bb7b3bc5badbfee3a> /usr/lib/libobjc.A.dylib
0x331c6000 - 0x331c6fff  vecLib armv7  <0c60cd0a60f43d2791d36cb357d30e3c> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib
0x331c7000 - 0x331f0fff  MobileCoreServices armv7  <57fef84bdc17301d8bf53ba0fb967fe6> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices
0x331f6000 - 0x33206fff  DataAccessExpress armv7  <66d9047da79a31daa887e6d84c42ecb2> /System/Library/PrivateFrameworks/DataAccessExpress.framework/DataAccessExpress
0x33207000 - 0x33216fff  UIAccessibility armv7  <414b92afa9713ae092e8b6dd300d4c73> /System/Library/PrivateFrameworks/UIAccessibility.framework/UIAccessibility
0x33217000 - 0x3325efff  MessageUI armv7  <35a81f5d4eb03467a1447db80337e570> /System/Library/Frameworks/MessageUI.framework/MessageUI
0x3325f000 - 0x33265fff  liblockdown.dylib armv7  <14c89b7346433c1f8675f454531f6ca3> /usr/lib/liblockdown.dylib
0x33287000 - 0x333a6fff  Foundation armv7  <09ff368178c5321c9715b9c8d491d53f> /System/Library/Frameworks/Foundation.framework/Foundation
0x333c3000 - 0x33517fff  AudioToolbox armv7  <6619c8c13f8d328e923e797fa8d0df23> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox
0x3351b000 - 0x33520fff  MobileKeyBag armv7  <8c35c090bc373cb181fc26b961b8dba5> /System/Library/PrivateFrameworks/MobileKeyBag.framework/MobileKeyBag
0x33521000 - 0x3360efff  libiconv.2.dylib armv7  <f4146ce07e3031ea8a81fa5516fd77d0> /usr/lib/libiconv.2.dylib
0x3360f000 - 0x3365dfff  GMM armv7  <049361f664eb3f30b0d25cd56ffc1f0f> /System/Library/PrivateFrameworks/GMM.framework/GMM
0x337ce000 - 0x337d1fff  ApplePushService armv7  <015c68c15621348db9f6a012499170e1> /System/Library/PrivateFrameworks/ApplePushService.framework/ApplePushService
0x337d3000 - 0x337e5fff  PersistentConnection armv7  <659ea9d5b13d3fefb37acff09016a69c> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection
0x337ef000 - 0x33818fff  ContentIndex armv7  <ecd71782cd833360872b943ecc65d203> /System/Library/PrivateFrameworks/ContentIndex.framework/ContentIndex
0x33819000 - 0x33828fff  MobileDeviceLink armv7  <563a09bcdb2f32369b1e22f53f58273a> /System/Library/PrivateFrameworks/MobileDeviceLink.framework/MobileDeviceLink
0x339ca000 - 0x33a09fff  libSystem.B.dylib armv7  <33dcf9a403ae3fd5971d6030ada2fcab> /usr/lib/libSystem.B.dylib
0x33a15000 - 0x33abefff  libxml2.2.dylib armv7  <5538d3f2c7d83b88b06168488fe6326b> /usr/lib/libxml2.2.dylib
0x33b81000 - 0x33baffff  MIME armv7  <60de1fe0bbb134d788c09f7c34b1caa4> /System/Library/PrivateFrameworks/MIME.framework/MIME
0x33bb0000 - 0x33cb4fff  JavaScriptCore armv7  <61a94142e2d23dafa2964190dd46e9e3> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore
0x33cb7000 - 0x33cc0fff  MobileWiFi armv7  <03d98d5cf6383695aa7d8a88da52f410> /System/Library/PrivateFrameworks/MobileWiFi.framework/MobileWiFi
0x33de0000 - 0x33df5fff  libresolv.9.dylib armv7  <e92cfbb83f7b330db19181e797bb3f7b> /usr/lib/libresolv.9.dylib
0x33dfa000 - 0x33e4ffff  libvDSP.dylib armv7  <0221caba81a235c5a896a835e2aac047> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib
0x33e51000 - 0x33f02fff  WebKit armv7  <eb9a0d69c64b3127b2bffd71641add3b> /System/Library/PrivateFrameworks/WebKit.framework/WebKit
0x33f03000 - 0x33f46fff  ManagedConfiguration armv7  <f790c26852cb3cf298abe56bc9a3940b> /System/Library/PrivateFrameworks/ManagedConfiguration.framework/ManagedConfiguration
0x33f5d000 - 0x33f90fff  StoreServices armv7  <d526715648f435c3aac4c42953e76d20> /System/Library/PrivateFrameworks/StoreServices.framework/StoreServices
0x3403b000 - 0x34094fff  EventKit armv7  <0d4e597ee229337183e96e921a72e30a> /System/Library/Frameworks/EventKit.framework/EventKit
0x34095000 - 0x34096fff  DataMigration armv7  <42e9e87a4e0735c3837e27d4f2adcf55> /System/Library/PrivateFrameworks/DataMigration.framework/DataMigration
0x340a1000 - 0x340a2fff  libremovefile.dylib armv7  <e8858a499d663e6a9e3c188521273cc1> /usr/lib/system/libremovefile.dylib
0x340b4000 - 0x340e9fff  AddressBook armv7  <3f2071a77bc134cd82065eef90d4082f> /System/Library/Frameworks/AddressBook.framework/AddressBook
0x340ea000 - 0x34130fff  CoreLocation armv7  <c1924042951e3df98515c7bf36093c1c> /System/Library/Frameworks/CoreLocation.framework/CoreLocation
0x3413d000 - 0x3413dfff  libCVMSPluginSupport.dylib armv7  <42d8aa2a31843a6e8bfff745644a7ba5> /System/Library/Frameworks/OpenGLES.framework/libCVMSPluginSupport.dylib
0x3413e000 - 0x34147fff  CoreVideo armv7  <ea847e6dba2d36b1826b255c73b39539> /System/Library/Frameworks/CoreVideo.framework/CoreVideo
0x3414a000 - 0x34182fff  IOKit armv7  <80ae313ad69d3363935c88e51a11862d> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x34183000 - 0x34199fff  EAP8021X armv7  <9fefc0ada30435fbb3b51818c74f6cb8> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X
0x341ac000 - 0x341c3fff  libsystem_kernel.dylib armv7  <a06ec84e53bf32098b63c0caebdb45b6> /usr/lib/system/libsystem_kernel.dylib
0x341c8000 - 0x34205fff  CoreText armv7  <fb6a72faec2330c4b2cd33c2e9c59588> /System/Library/Frameworks/CoreText.framework/CoreText
0x3420a000 - 0x34223fff  libRIP.A.dylib armv7  <4825c3e392983aba947eca06555e4480> /System/Library/Frameworks/CoreGraphics.framework/Resources/libRIP.A.dylib
0x3427e000 - 0x34280fff  libgcc_s.1.dylib armv7  <a2631ac302f4310dae8367939e16b7c2> /usr/lib/libgcc_s.1.dylib
0x34281000 - 0x34284fff  libmacho.dylib armv7  <43311c113a9d3182b7d007129819f029> /usr/lib/system/libmacho.dylib
0x34285000 - 0x34293fff  OpenGLES armv7  <5a76beaeaa013f0cbf16e5cb154598ab> /System/Library/Frameworks/OpenGLES.framework/OpenGLES
0x34390000 - 0x34398fff  MobileBluetooth armv7  <63f11756c4aa3262b2317ff3b8e2a977> /System/Library/PrivateFrameworks/MobileBluetooth.framework/MobileBluetooth
0x34399000 - 0x343dffff  CoreTelephony armv7  <af7d1e770e5a3ffd8834a57fb5d40557> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
0x343e0000 - 0x343e1fff  CoreSurface armv7  <7b83cd757da73e6e826693c29296d3fa> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface
0x345a8000 - 0x34617fff  ProofReader armv7  <6d843c6aecdd37ae84baa40af8ad7e65> /System/Library/PrivateFrameworks/ProofReader.framework/ProofReader
0x3461b000 - 0x34620fff  libsystem_dnssd.dylib armv7  <c7cfe523e2d73521abc01587313ef730> /usr/lib/system/libsystem_dnssd.dylib
0x34621000 - 0x34622fff  libdyld.dylib armv7  <41a7b5e5d9983449ab33affed0f635ad> /usr/lib/system/libdyld.dylib
0x34740000 - 0x347effff  QuartzCore armv7  <ef9632c9781f3101916b65e9faae1579> /System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x34841000 - 0x348cbfff  Message armv7  <2cce1aa95a493906bb0227197f9e4b96> /System/Library/PrivateFrameworks/Message.framework/Message
0x348cc000 - 0x348dcfff  WebBookmarks armv7  <6956561235333e74b8ff316cb2edc93e> /System/Library/PrivateFrameworks/WebBookmarks.framework/WebBookmarks
0x349bb000 - 0x34b07fff  MediaToolbox armv7  <482b13059e8a329fa5d832baede25103> /System/Library/PrivateFrameworks/MediaToolbox.framework/MediaToolbox
0x34b08000 - 0x34b11fff  ITSync armv7  <ba8b48d061903e4096774344448776d0> /System/Library/PrivateFrameworks/ITSync.framework/ITSync
0x34e7e000 - 0x34efffff  libsystem_c.dylib armv7  <a7077267b6743ed3bbdd86d4380c75d9> /usr/lib/system/libsystem_c.dylib
0x3505d000 - 0x3509dfff  CoreMedia armv7  <8e0570582ba535bfa74f1f00eef64376> /System/Library/Frameworks/CoreMedia.framework/CoreMedia
0x3509e000 - 0x350a8fff  ExternalAccessory armv7  <eebb4bdbbefb37419b884ffa011e1dc5> /System/Library/Frameworks/ExternalAccessory.framework/ExternalAccessory
0x350a9000 - 0x350ebfff  CoreAudio armv7  <c972fd5f8e89333ca680b9a33587f896> /System/Library/Frameworks/CoreAudio.framework/CoreAudio
0x3525b000 - 0x3525ffff  libcache.dylib armv7  <d2f7fd2a352b3cd59c564be34b53cf80> /usr/lib/system/libcache.dylib
0x3527c000 - 0x35283fff  libMobileGestalt.dylib armv7  <55f29184efcc3046bb833dd72a4487e1> /usr/lib/libMobileGestalt.dylib
0x35284000 - 0x35293fff  Notes armv7  <d9c976ca976e3d029f69febd48f17601> /System/Library/PrivateFrameworks/Notes.framework/Notes
0x352a4000 - 0x352c3fff  Bom armv7  <b178e3efb4d733c694bd5a55e57a314f> /System/Library/PrivateFrameworks/Bom.framework/Bom
0x35404000 - 0x35408fff  libGFXShared.dylib armv7  <a0772a32cd8b3b9194bb0c29807c1c5b> /System/Library/Frameworks/OpenGLES.framework/libGFXShared.dylib
0x35419000 - 0x3546afff  libsqlite3.dylib armv7  <8a41cc6a6d9332308bc415d27577fd24> /usr/lib/libsqlite3.dylib
0x3546b000 - 0x35472fff  libbz2.1.0.dylib armv7  <0a082e1d475432959ba93aa3dbf7fb31> /usr/lib/libbz2.1.0.dylib
0x354cf000 - 0x35502fff  QuickLook armv7  <29d2d981d1d6358381f5716ee37314b4> /System/Library/Frameworks/QuickLook.framework/QuickLook
0x35503000 - 0x3553afff  Security armv7  <6599f42a910b3b31a0e1d98c883d61cb> /System/Library/Frameworks/Security.framework/Security
0x3553b000 - 0x3553cfff  libsystem_blocks.dylib armv7  <ccc041df3de73eafb7a59e74cdb1702b> /usr/lib/system/libsystem_blocks.dylib
0x3553d000 - 0x35575fff  libCGFreetype.A.dylib armv7  <ccea634795153164a681f0f311f4461d> /System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib
0x35789000 - 0x3578bfff  MobileInstallation armv7  <94b6d6c5d9883175af26764567528127> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation
0x357dc000 - 0x357dffff  CaptiveNetwork armv7  <fc834fd33a18341ea7506587ad895703> /System/Library/PrivateFrameworks/CaptiveNetwork.framework/CaptiveNetwork
0x357e0000 - 0x3581cfff  libGLImage.dylib armv7  <9d97699e44ee3651ba4ac37e5adec35b> /System/Library/Frameworks/OpenGLES.framework/libGLImage.dylib
0x3581d000 - 0x35827fff  AccountSettings armv7  <d083fb384dc7311eb6766b9b2d2dd9c8> /System/Library/PrivateFrameworks/AccountSettings.framework/AccountSettings
0x35836000 - 0x35880fff  libstdc++.6.dylib armv7  <b2cac408951c3f3c9ba3cf563e54ce81> /usr/lib/libstdc++.6.dylib
0x35887000 - 0x35887fff  libsystem_sandbox.dylib armv7  <f47c01d627853b328e088b3fdd08e87d> /usr/lib/system/libsystem_sandbox.dylib
0x3588c000 - 0x3588ffff  CertUI armv7  <9060fe03a4943ef295531feced9a17dd> /System/Library/PrivateFrameworks/CertUI.framework/CertUI
0x35890000 - 0x358adfff  libsystem_info.dylib armv7  <48016be86e3f3cd9aeee1c6590e1ac6f> /usr/lib/system/libsystem_info.dylib
0x358e3000 - 0x359ebfff  CoreData armv7  <9843a401dd1d322383e3e40021cc8b95> /System/Library/Frameworks/CoreData.framework/CoreData
0x35a9c000 - 0x35aa3fff  AggregateDictionary armv7  <ab9777b39e8e3026ad64dc90323cad7e> /System/Library/PrivateFrameworks/AggregateDictionary.framework/AggregateDictionary
0x35aa4000 - 0x35af2fff  CoreMotion armv7  <58c353bb7e33361f881da07c72f4cdfb> /System/Library/Frameworks/CoreMotion.framework/CoreMotion
0x35af3000 - 0x35af4fff  libsystem_network.dylib armv7  <39bf0f48bd8539169a77f8f61cdcd4c9> /usr/lib/system/libsystem_network.dylib
0x35af5000 - 0x35af7fff  libAccessibility.dylib armv7  <d55f1553d14831a2a5435ae27ef75ef4> /usr/lib/libAccessibility.dylib
0x35af8000 - 0x35afbfff  IOSurface armv7  <ad50e71624583d06b891344d832f9b08> /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface
0x35afc000 - 0x35b2ffff  iCalendar armv7  <34ce1957082f3518b5740ac33cfc92eb> /System/Library/PrivateFrameworks/iCalendar.framework/iCalendar
0x35b30000 - 0x35b30fff  Accelerate armv7  <7d5ad465049136afaa1f0d89aac600bc> /System/Library/Frameworks/Accelerate.framework/Accelerate
0x35d32000 - 0x35df1fff  CFNetwork armv7  <b09e0d53de9f3bc8bde494780f3cdd4f> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x35fd4000 - 0x36003fff  SystemConfiguration armv7  <1d73b8a159363f96bb9c039655c5eae6> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration
0x36004000 - 0x36024fff  AppleAccount armv7  <4e0ac5cf93b338ab8c5f34ba3c5e2ee4> /System/Library/PrivateFrameworks/AppleAccount.framework/AppleAccount
0x36025000 - 0x3602bfff  ProtocolBuffer armv7  <f9277ee9b85b3722975ad319a323aca0> /System/Library/PrivateFrameworks/ProtocolBuffer.framework/ProtocolBuffer
0x3602c000 - 0x36637fff  WebCore armv7  <07941e59d0a33f94802c16c76238fddf> /System/Library/PrivateFrameworks/WebCore.framework/WebCore
0x36644000 - 0x36650fff  AXRuntime armv7  <6698f47f8d1732579ebd62fff9c35035> /System/Library/PrivateFrameworks/AXRuntime.framework/AXRuntime
0x36970000 - 0x36983fff  libmis.dylib armv7  <529ea6e3a87230ce9f6cf3285c22429c> /usr/lib/libmis.dylib
0x36994000 - 0x36a79fff  CoreFoundation armv7  <a8444f997111304c9571b3ff974b769c> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x36a91000 - 0x36b37fff  Celestial armv7  <7fbd02fa664b33babaf0327c320d1491> /System/Library/PrivateFrameworks/Celestial.framework/Celestial
0x36bbb000 - 0x36bcdfff  VoiceServices armv7  <d219dd8a59c93390b3461a015e28b29c> /System/Library/PrivateFrameworks/VoiceServices.framework/VoiceServices
0x36bfe000 - 0x36c04fff  IAP armv7  <c0f4c99a1b493e489948f231ad9238e2> /System/Library/PrivateFrameworks/IAP.framework/IAP
0x36c29000 - 0x36c36fff  libbsm.0.dylib armv7  <0a1e2bb78d5138419ecad8ba0fe42fdd> /usr/lib/libbsm.0.dylib
0x36cd3000 - 0x36df4fff  CoreGraphics armv7  <65f6c8701b563542820a26b0dfc4f6a4> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics

One thing I tried was suspending all threads except the main thread with the debugger. This works to prevent crashes until the system starts another thread.

Notes:

• My program doesn't run any background threads that could cause this.
• Fitting the plots immediately after pinching the graph to zoom causes it to crash around a third of the time while fitting the plots when the app has been idle for some time rarely causes a crash.
• It doesn't crash on the Simulator. Only the device.

Is this a known bug with CorePlot? Any help would be appreciated.

EDIT: My app sets the global x and y range of the plot space to nil immediately before calling scaleToFitPlots: (So that is can fit a to plots outside the current global range). When I remove this, the app no longer crashes.

Is this a bug with CorePlot? How could I work around this? (I still need to limit user zooming with pinch gestures)

Upgrade to Core Plot 0.4.

I no longer get this crash after I upgraded to 0.4. http://code.google.com/p/core-plot/downloads/list?can=2&q=&sort=-uploaded&colspec=Filename%20Summary%20Uploaded%20ReleaseDate%20Size%20DownloadCount