Crash in SDWebImageDownloaderOperation start (objc_retain) on iOS 26 only #3842
Description
We are experiencing a crash in production related to SDWebImage.
The crash seems to occur on the download queue when calling -[SDWebImageDownloaderOperation start].
This issue has only been observed on iOS 26 devices.
We cannot reproduce this issue locally on older OS versions, but it is consistently reported via Firebase Crashlytics.
Crash Log
Crashed: com.hackemist.SDWebImageDownloader.downloadQueue (QOS: UNSPECIFIED)
0 libobjc.A.dylib 0x1444 objc_retain_x0 + 8
1 libobjc.A.dylib 0x1444 objc_retain + 8
2 SDWebImage 0x1fcb0 -[SDWebImageDownloaderOperation start] + 235 (SDWebImageDownloaderOperation.m:235)
3 Foundation 0x17ddc <redacted> + 16
4 Foundation 0x17698 <redacted> + 164
5 libdispatch.dylib 0x11450 <redacted> + 148
6 libdispatch.dylib 0x1b7ec <redacted> + 16
7 libdispatch.dylib 0x6664 <redacted> + 596
8 libdispatch.dylib 0x5cd8 <redacted> + 580
9 libdispatch.dylib 0x13f48 <redacted> + 364
10 libdispatch.dylib 0x146fc <redacted> + 180
11 libsystem_pthread.dylib 0x137c _pthread_wqthread + 232
12 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
All Stack Trace
com.apple.main-thread
0 libsystem_kernel.dylib 0xcd4 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x42f8 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x4214 mach_msg_overwrite + 428
3 libsystem_kernel.dylib 0x405c mach_msg + 24
4 CoreFoundation 0x47a08 <redacted> + 160
5 CoreFoundation 0x1da20 <redacted> + 1188
6 CoreFoundation 0x1cc44 <redacted> + 532
7 GraphicsServices 0x1498 GSEventRunModal + 120
8 UIKitCore 0xa9ddc <redacted> + 792
9 UIKitCore 0x4eb0c UIApplicationMain + 336
10 UIKitCore 0x18a860 <redacted> + 588
11 Beadal 0x52c180 main + 4338745728 (AppDelegate.swift:4338745728)
12 ??? 0x187daee28 (누락)
com.apple.uikit.eventfetch-thread
0 libsystem_kernel.dylib 0xcd4 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x42f8 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x4214 mach_msg_overwrite + 428
3 libsystem_kernel.dylib 0x405c mach_msg + 24
4 CoreFoundation 0x47a08 <redacted> + 160
5 CoreFoundation 0x1da20 <redacted> + 1188
6 CoreFoundation 0x1cc44 <redacted> + 532
7 Foundation 0x98f734 <redacted> + 212
8 Foundation 0x98f90c <redacted> + 64
9 UIKitCore 0x7afe8 <redacted> + 408
10 Foundation 0x61d3c <redacted> + 732
11 libsystem_pthread.dylib 0x444c _pthread_start + 136
12 libsystem_pthread.dylib 0x8cc thread_start + 8
com.sendbird.core.runloop.thread
0 libsystem_kernel.dylib 0xcd4 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x42f8 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x4214 mach_msg_overwrite + 428
3 libsystem_kernel.dylib 0x405c mach_msg + 24
4 CoreFoundation 0x47a08 <redacted> + 160
5 CoreFoundation 0x1da20 <redacted> + 1188
6 CoreFoundation 0x1cc44 <redacted> + 532
7 Foundation 0x98f734 <redacted> + 212
8 SendbirdChatSDK 0x34aad4 SBRunloopThread.main() + 61 (Runloop+SBTimer.swift:61)
9 SendbirdChatSDK 0x34ab48 @objc SBRunloopThread.main() + 4486458184 (<compiler-generated>:4486458184)
10 Foundation 0x61d3c <redacted> + 732
11 libsystem_pthread.dylib 0x444c _pthread_start + 136
12 libsystem_pthread.dylib 0x8cc thread_start + 8
com.google.firebase.crashlytics.MachExceptionServer
0 Beadal 0xf5f444 FIRCLSProcessRecordAllThreads + 4349441092
1 Beadal 0xf5f828 FIRCLSProcessRecordAllThreads + 4349442088
2 Beadal 0xf6d984 FIRCLSHandler + 4349499780
3 Beadal 0xf6e190 FIRCLSMachExceptionServer + 4349501840
4 libsystem_pthread.dylib 0x444c _pthread_start + 136
5 libsystem_pthread.dylib 0x8cc thread_start + 8
com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib 0xcd4 mach_msg2_trap + 8
1 libsystem_kernel.dylib 0x42f8 mach_msg2_internal + 76
2 libsystem_kernel.dylib 0x4214 mach_msg_overwrite + 428
3 libsystem_kernel.dylib 0x405c mach_msg + 24
4 CoreFoundation 0x47a08 <redacted> + 160
5 CoreFoundation 0x1da20 <redacted> + 1188
6 CoreFoundation 0x1cc44 <redacted> + 532
7 CFNetwork 0x248868 +[__CFN_CoreSchedulingSetRunnable _run:] + 416
8 Foundation 0x61d3c <redacted> + 732
9 libsystem_pthread.dylib 0x444c _pthread_start + 136
10 libsystem_pthread.dylib 0x8cc thread_start + 8
Log work queue
0 libsystem_kernel.dylib 0xc50 semaphore_wait_trap + 8
1 WebKit 0x96df4 <redacted> + 48
2 JavaScriptCore 0x1c0da8 <redacted> + 368
3 JavaScriptCore 0x1c0e88 <redacted> + 16
4 libsystem_pthread.dylib 0x444c _pthread_start + 136
5 libsystem_pthread.dylib 0x8cc thread_start + 8
caulk::deferred_logger
0 libsystem_kernel.dylib 0xc50 semaphore_wait_trap + 8
1 caulk 0x443c caulk::semaphore::timed_wait(double) + 224
2 caulk 0x4488 caulk::concurrent::details::worker_thread::run() + 32
3 caulk 0x8bf4 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*>>>(void*) + 96
4 libsystem_pthread.dylib 0x444c _pthread_start + 136
5 libsystem_pthread.dylib 0x8cc thread_start + 8
caulk.messenger.shared:high
0 libsystem_kernel.dylib 0xc50 semaphore_wait_trap + 8
1 caulk 0x443c caulk::semaphore::timed_wait(double) + 224
2 caulk 0x4488 caulk::concurrent::details::worker_thread::run() + 32
3 caulk 0x8bf4 void* caulk::thread_proxy<std::__1::tuple<caulk::thread::attributes, void (caulk::concurrent::details::worker_thread::*)(), std::__1::tuple<caulk::concurrent::details::worker_thread*>>>(void*) + 96
4 libsystem_pthread.dylib 0x444c _pthread_start + 136
5 libsystem_pthread.dylib 0x8cc thread_start + 8
Thread
0 libsystem_kernel.dylib 0xa80 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1404 _pthread_wqthread + 368
2 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
com.hackemist.SDImageCache.ioQueue
0 libsystem_kernel.dylib 0x54a0 __rename + 8
1 libsystem_kernel.dylib 0x547c rename + 16
2 Foundation 0x70dd8 <redacted> + 112
3 Foundation 0x709dc <redacted> + 532
4 Foundation 0x73934 <redacted> + 2312
5 Foundation 0x7047c <redacted> + 48
6 Foundation 0x70498 <redacted> + 16
7 Foundation 0x704b0 <redacted> + 16
8 Foundation 0x41570 <redacted> + 204
9 Foundation 0x6f7c4 <redacted> + 516
10 Foundation 0x6f574 <redacted> + 96
11 SDWebImage 0x90c0 -[SDDiskCache setData:forKey:] + 99 (SDDiskCache.m:99)
12 SDWebImage 0xc45c -[SDImageCache _storeImageDataToDisk:forKey:] + 362 (SDImageCache.m:362)
13 SDWebImage 0xc05c __81-[SDImageCache storeImage:imageData:forKey:options:context:cacheType:completion:]_block_invoke.99 + 296 (SDImageCache.m:296)
14 libdispatch.dylib 0x1adc <redacted> + 32
15 libdispatch.dylib 0x1b7ec <redacted> + 16
16 libdispatch.dylib 0xa468 <redacted> + 740
17 libdispatch.dylib 0xaf78 <redacted> + 440
18 libdispatch.dylib 0x153ec <redacted> + 292
19 libdispatch.dylib 0x14ce4 <redacted> + 692
20 libsystem_pthread.dylib 0x13b8 _pthread_wqthread + 292
21 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
Thread
0 libsystem_pthread.dylib 0x8b8 (누락 UUID 187bdc447ab83bc29973debc0798eaa4)
Thread
0 libsystem_kernel.dylib 0xa80 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1404 _pthread_wqthread + 368
2 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
Crashed: com.hackemist.SDWebImageDownloader.downloadQueue (QOS: UNSPECIFIED)
0 libobjc.A.dylib 0x1444 objc_retain_x0 + 8
1 libobjc.A.dylib 0x1444 objc_retain + 8
2 SDWebImage 0x1fcb0 -[SDWebImageDownloaderOperation start] + 235 (SDWebImageDownloaderOperation.m:235)
3 Foundation 0x17ddc <redacted> + 16
4 Foundation 0x17698 <redacted> + 164
5 libdispatch.dylib 0x11450 <redacted> + 148
6 libdispatch.dylib 0x1b7ec <redacted> + 16
7 libdispatch.dylib 0x6664 <redacted> + 596
8 libdispatch.dylib 0x5cd8 <redacted> + 580
9 libdispatch.dylib 0x13f48 <redacted> + 364
10 libdispatch.dylib 0x146fc <redacted> + 180
11 libsystem_pthread.dylib 0x137c _pthread_wqthread + 232
12 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0xa80 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1404 _pthread_wqthread + 368
2 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
Thread
0 libsystem_kernel.dylib 0xa80 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x1404 _pthread_wqthread + 368
2 libsystem_pthread.dylib 0x8c0 start_wqthread + 8
Thread
0 libsystem_pthread.dylib 0x8b8 (누락 UUID 187bdc447ab83bc29973debc0798eaa4)
JavaScriptCore libpas scavenger
0 libsystem_kernel.dylib 0x65d4 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x2b58 <redacted> + 984
2 JavaScriptCore 0xdf40 <redacted> + 1660
3 libsystem_pthread.dylib 0x444c _pthread_start + 136
4 libsystem_pthread.dylib 0x8cc thread_start + 8
Environment
iOS version: 26 only
SDWebImage version: 5.20.0
Integration method: SPM