Rare platform crash when accessing downloaded NSData bytes

Originator:reuben.scratton
Number:rdar://20172678 Date Originated:16 March 2015
Status:Open Resolved:
Product:iOS SDK Product Version:7.x,8.x
Classification:Crash Reproducible:Barely
 
Our app performs all downloads with [NSURLSession dataTaskWithRequest]. Most data is processed on the downloading thread (i.e. in the callback passed to dataTaskWithRequest) into a more usable runtime representation, e.g. JSON data gets parsed into Obj-C model objects.

In the specific case of images, the downloaded image data (i.e. the raw bytes of the PNG or JPG) often end up being passed unmodified to another background thread that decompresses it for display. 

That image decompression thread will *very* occasionally (we estimate once per 10,000 users) crash deep inside platform image decompression code:

Exception Type:  SIGSEGV
Exception Codes: SEGV_ACCERR at 0x1046f8000
Crashed Thread:  9

Thread 9 Crashed:
0   Celestial                            0x000000018e6bfa68 JPEGParseJPEGInfo + 780
1   Celestial                            0x000000018e6a0740 createPixelBufferFromJPEG + 324
...
12  libRIP.A.dylib                       0x000000018872cb04 ripc_DrawImage + 600
13  CoreGraphics                         0x0000000188374250 CGContextDrawImage + 404
14  <our app>                             0x00000001000a078c -[BNImageView decodeImageInBackground:forKey:] (BNImageView.m:249)

The crash reports show that the crash only occurs when the downloaded bytes are also being written to the url cache by another thread which does not crash:

Thread 3:
0   libsystem_kernel.dylib               0x0000000198ffa22c close + 8
1   CoreFoundation                       0x000000018802b674 _CFStreamClose + 112
2   Foundation                           0x0000000188fd8714 +[NSKeyedArchiver archiveRootObject:toFile:] + 280
3   <our app>                            0x000000010003e318 __57-[BNURLCachedInfo updateCachedObject:withHeaders:andTTL:]_block_invoke (BNURLCachedInfo.m:257)

The NSKeyedArchiver here is (or has been) writing out the exact same NSData (actually an instance of the private class os_dispatch_data) that the image decompressor crashed on. We feel this is very likely to be relevant.

The workaround we've come up with is to have our downloader make a deep copy of the NSData bytes for image requests, and pass that copy to the decompressor. This workaround has been 100% effective.

Steps to Reproduce:
I wish we could show you how to reproduce it, however this crash is sufficiently rare that we have never been able to reproduce it ourselves... our diagnosis and eventual workaround was all done by pondering crash reports (a sample of which is attached).

The app is quite big - roughly 3 million users - and we estimate this crash occurred for one in every 10,000 users.

Expected Results:
No crash.

Actual Results:
Our users would get the standard crash experience of the app suddenly closing and finding themselves on their home screen.

Version:
iOS 7.x, and 8.x.



Relevant parts of crash report:

Exception Type:  SIGSEGV
Exception Codes: SEGV_ACCERR at 0x1046f8000

Application Specific Information:
Selector name found in current argument registers: length

Thread 3: (the url cacher)
0   libsystem_kernel.dylib               0x0000000198ffa22c close + 8
1   CoreFoundation                       0x000000018802b674 _CFStreamClose + 112
2   Foundation                           0x0000000188fd8714 +[NSKeyedArchiver archiveRootObject:toFile:] + 280
3   <our app>                              0x000000010003e318 __57-[BNURLCachedInfo updateCachedObject:withHeaders:andTTL:]_block_invoke (BNURLCachedInfo.m:257)
4   <our app>                              0x000000010005c954 __44+[BNBlockOperation blockOperationWithBlock:]_block_invoke (BNBlockOperation.m:17)
5   Foundation                           0x0000000188fe7508 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
6   Foundation                           0x0000000188f38c94 -[NSBlockOperation main] + 92
7   Foundation                           0x0000000188f2861c -[__NSOperationInternal _start:] + 632
8   Foundation                           0x0000000188fea26c __NSOQSchedule_f + 224
9   libdispatch.dylib                    0x0000000198ed136c _dispatch_client_callout + 12
10  libdispatch.dylib                    0x0000000198edb4c0 _dispatch_queue_drain + 1212
11  libdispatch.dylib                    0x0000000198ed4474 _dispatch_queue_invoke + 128
12  libdispatch.dylib                    0x0000000198edd224 _dispatch_root_queue_drain + 660
13  libdispatch.dylib                    0x0000000198ede75c _dispatch_worker_thread3 + 104
14  libsystem_pthread.dylib              0x00000001990ad2e4 _pthread_wqthread + 812
15  libsystem_pthread.dylib              0x00000001990acfa8 start_wqthread + 0


Thread 9 (the image decompressor) Crashed:
0   Celestial                            0x000000018e6bfa68 JPEGParseJPEGInfo + 780
1   Celestial                            0x000000018e6a0740 createPixelBufferFromJPEG + 324
2   Celestial                            0x000000018e6a1f88 FigAspenDecodeJPEGIntoRGBSurface + 240
3   ImageIO                              0x000000018937696c createIOSurfaceWithHardwareJpegDecode + 164
4   ImageIO                              0x000000018937700c createImageBlockSetWithAspenHardwareDecode + 692
5   ImageIO                              0x00000001893a6778 copyImageBlockSetAppleJPEG + 5028
6   ImageIO                              0x00000001892f745c ImageProviderCopyImageBlockSetCallback + 780
7   CoreGraphics                         0x0000000188384088 img_blocks_create + 408
8   CoreGraphics                         0x0000000188378e00 img_decode_stage + 364
9   CoreGraphics                         0x0000000188375548 img_data_lock + 1560
10  CoreGraphics                         0x0000000188374520 CGSImageDataLock + 136
11  libRIP.A.dylib                       0x000000018872d730 ripc_AcquireImage + 768
12  libRIP.A.dylib                       0x000000018872cb04 ripc_DrawImage + 600
13  CoreGraphics                         0x0000000188374250 CGContextDrawImage + 404
14  <our app>                              0x00000001000a078c -[BNImageView decodeImageInBackground:forKey:] (BNImageView.m:249)
15  <our app>                              0x00000001000a188c __56-[BNImageView onRequestLoadedObject:object:isCacheData:]_block_invoke (BNImageView.m:393)
16  libdispatch.dylib                    0x0000000198ed13ac _dispatch_call_block_and_release + 20
17  libdispatch.dylib                    0x0000000198ed136c _dispatch_client_callout + 12
18  libdispatch.dylib                    0x0000000198edb4c0 _dispatch_queue_drain + 1212
19  libdispatch.dylib                    0x0000000198ed4474 _dispatch_queue_invoke + 128
20  libdispatch.dylib                    0x0000000198edd224 _dispatch_root_queue_drain + 660
21  libdispatch.dylib                    0x0000000198ede75c _dispatch_worker_thread3 + 104
22  libsystem_pthread.dylib              0x00000001990ad2e4 _pthread_wqthread + 812
23  libsystem_pthread.dylib              0x00000001990acfa8 start_wqthread + 0


Thread 9 crashed with ARM-64 Thread State:
    pc: 0x000000018e6bfa68     fp: 0x00000001029f0a40     sp: 0x00000001029f09d0     x0: 0x000000000000a947 
    x1: 0x000000018d0b5ab5     x2: 0x0000000100000000     x3: 0x0000000200000000     x4: 0x000000000000a947 
    x5: 0x0000000000000000     x6: 0x0000000000000000     x7: 0x00000001029f0adb     x8: 0x00000001046f8018 
    x9: 0x0000000000000000    x10: 0x0000000000000001    x11: 0x0000000000000001    x12: 0x0000000500000000 
   x13: 0x0000000300000000    x14: 0x0000000400000000    x15: 0x0000000600000000    x16: 0x0000000700000000 
   x17: 0x0000000800000000    x18: 0x0000000000000000    x19: 0x00000001029f0adc    x20: 0x00000001029f0adb 
   x21: 0x00000001046f8000    x22: 0x00000001029f0b8c    x23: 0x00000001029f0af0    x24: 0x00000001029f0af8 
   x25: 0x00000001029f0b00    x26: 0x00000001029f0b08    x27: 0x00000001375b7dd0    x28: 0x00000001029f0ada 
    lr: 0x000000018e6bf7b0   cpsr: 0x0000000020000000 

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       0x198d24000 -        0x198e12fff  libxml2.2.dylib arm64  <dbcfe4d423bb3ae48174394f298ad244> /usr/lib/libxml2.2.dylib
       0x198e14000 -        0x198e3dfff  libxslt.1.dylib arm64  <f3770c5f8ac3313bbe4ef1258ebf5733> /usr/lib/libxslt.1.dylib
       0x198e40000 -        0x198e51fff  libz.1.dylib arm64  <2a347410b967358289e8256c913714de> /usr/lib/libz.1.dylib
       0x198e54000 -        0x198e58fff  libcache.dylib arm64  <d322f485769b3fd5a11bc2aff7265fdf> /usr/lib/system/libcache.dylib
       0x198e5c000 -        0x198e68fff  libcommonCrypto.dylib arm64  <6cb05550a33e392189c0d88e951f00f9> /usr/lib/system/libcommonCrypto.dylib
       0x198e6c000 -        0x198e6ffff  libcompiler_rt.dylib arm64  <65f2a15e126435769154e2a7b44b942e> /usr/lib/system/libcompiler_rt.dylib
       0x198e70000 -        0x198e77fff  libcopyfile.dylib arm64  <1f428d2df193398e9e72250952f08953> /usr/lib/system/libcopyfile.dylib
       0x198e78000 -        0x198ecdfff  libcorecrypto.dylib arm64  <c4022dca81eb3632a6d7f69bc6f083a1> /usr/lib/system/libcorecrypto.dylib
       0x198ed0000 -        0x198ef6fff  libdispatch.dylib arm64  <e19d74563485344485b6d4457a93e89d> /usr/lib/system/libdispatch.dylib
       0x198ef8000 -        0x198efafff  libdyld.dylib arm64  <7387fcdff0b93cbcab450356edc79b67> /usr/lib/system/libdyld.dylib
       0x198efc000 -        0x198efcfff  liblaunch.dylib arm64  <8224fcd7ddf93c0d81826478dfe9de27> /usr/lib/system/liblaunch.dylib
       0x198f00000 -        0x198f05fff  libmacho.dylib arm64  <cddfd20412643baeb9023095eb2cf29f> /usr/lib/system/libmacho.dylib
       0x198f08000 -        0x198f09fff  libremovefile.dylib arm64  <e8124da88b1131f2ac005b75d8559ca7> /usr/lib/system/libremovefile.dylib
       0x198f0c000 -        0x198f21fff  libsystem_asl.dylib arm64  <17448aec6f7d3498aebcabc8a1598c9a> /usr/lib/system/libsystem_asl.dylib
       0x198f24000 -        0x198f25fff  libsystem_blocks.dylib arm64  <f38b7145bed330d98d8d79b8362b03de> /usr/lib/system/libsystem_blocks.dylib
       0x198f28000 -        0x198fa8fff  libsystem_c.dylib arm64  <0fd40ab9115536e3843b8064b1748c7a> /usr/lib/system/libsystem_c.dylib
       0x198fac000 -        0x198faefff  libsystem_configuration.dylib arm64  <37655cc87bb3391b946955b0fbc4384a> /usr/lib/system/libsystem_configuration.dylib
       0x198fb0000 -        0x198fb1fff  libsystem_coreservices.dylib arm64  <a8e2019df4123295bf71800fa1bd73be> /usr/lib/system/libsystem_coreservices.dylib
       0x198fb4000 -        0x198fc4fff  libsystem_coretls.dylib arm64  <e837369c4d623fc7adb19a892b03aba8> /usr/lib/system/libsystem_coretls.dylib
       0x198fc8000 -        0x198fd0fff  libsystem_dnssd.dylib arm64  <18b39491d06c3fa18c810118f03143ee> /usr/lib/system/libsystem_dnssd.dylib
       0x198fd4000 -        0x198ff5fff  libsystem_info.dylib arm64  <72514f76b03335729f18da536331df97> /usr/lib/system/libsystem_info.dylib
       0x198ff8000 -        0x199018fff  libsystem_kernel.dylib arm64  <c9a63d5247363e37917b9202cd05b13f> /usr/lib/system/libsystem_kernel.dylib
       0x19901c000 -        0x199038fff  libsystem_m.dylib arm64  <5b5fb8f53a2a3ebd9696d92758148322> /usr/lib/system/libsystem_m.dylib
       0x19903c000 -        0x199055fff  libsystem_malloc.dylib arm64  <bb0250acb085340ea6689a755edc5515> /usr/lib/system/libsystem_malloc.dylib
       0x199058000 -        0x19908ffff  libsystem_network.dylib arm64  <2f8dd27634de3f66b15dc96981143ad0> /usr/lib/system/libsystem_network.dylib
       0x199090000 -        0x199096fff  libsystem_networkextension.dylib arm64  <fed7dcc5e8db37249addf5b14210492d> /usr/lib/system/libsystem_networkextension.dylib
       0x199098000 -        0x1990a2fff  libsystem_notify.dylib arm64  <4a9bcea2df8d351f987d0e9f84406427> /usr/lib/system/libsystem_notify.dylib
       0x1990a4000 -        0x1990a8fff  libsystem_platform.dylib arm64  <03902be9733b35d2b193cf8724a8d95a> /usr/lib/system/libsystem_platform.dylib
       0x1990ac000 -        0x1990b4fff  libsystem_pthread.dylib arm64  <ddb19a684b2d3281a81fb6688c7e5a78> /usr/lib/system/libsystem_pthread.dylib
       0x1990b8000 -        0x1990bafff  libsystem_sandbox.dylib arm64  <d8c82f4047333b93ae88ae4f71a1ce8c> /usr/lib/system/libsystem_sandbox.dylib
       0x1990bc000 -        0x1990bffff  libsystem_stats.dylib arm64  <e2b3982965873f27b542a1a81f212b5b> /usr/lib/system/libsystem_stats.dylib
       0x1990c0000 -        0x1990c6fff  libsystem_trace.dylib arm64  <122df0fd03b43a8f82ed69916c95524a> /usr/lib/system/libsystem_trace.dylib
       0x1990c8000 -        0x1990cdfff  libunwind.dylib arm64  <0c07617876a43cacbde6104a2b75f4f2> /usr/lib/system/libunwind.dylib
       0x1990d0000 -        0x1990f3fff  libxpc.dylib arm64  <a4f17798f3de3fbc85e3f569762f0eb9> /usr/lib/system/libxpc.dylib

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