Bug 37254 - sgen crashes app when cleaning up BehaviorSubject after it has been disposed
Summary: sgen crashes app when cleaning up BehaviorSubject after it has been disposed
Status: VERIFIED FIXED
Alias: None
Product: iOS
Classification: Xamarin
Component: Mono runtime / AOT compiler ()
Version: XI 9.4 (iOS 9.2)
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: C6SR2
Assignee: Rodrigo Kumpera
URL:
Depends on:
Blocks:
 
Reported: 2015-12-22 23:24 UTC by drichnak
Modified: 2016-03-03 14:02 UTC (History)
12 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:


Attachments
Demo app of the sgen assertion failure (7.23 MB, application/zip)
2015-12-22 23:24 UTC, drichnak
Details


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Status:
VERIFIED FIXED

Description drichnak 2015-12-22 23:24:39 UTC
Created attachment 14389 [details]
Demo app of the sgen assertion failure

In our app, we have a View Model that has a Reactive Extensions BehaviorSubject as a property. When our app is disposing of the VM, we explicitly call .Dispose() on the BehaviorSubject. 

When enough memory pressure is applied following the .Dispose(), the app crashes with the below assertion failure: 
error: * Assertion: should not be reached at ../../../../../mono/mono/sgen/sgen-scan-object.h:101

I believe the garbage collector is having some issue when sweeping and cleaning up the BehaviorSubject in particular. This app crash doesn't occur if we comment out the Dispose, or if we use another RX class like ReplaySubject or Subject. 

I'm attaching demo app.

To repro: 
- tap the BehaviorSubject button
- tap Back to Dispose the BehaviorSubject
- do this 3-5 times, eventually when creating a ViewController, the app will crash with the assertion failure. 

To (not) repro: 
- tap the ReplaySubject button
- tap back to Dispose the ReplaySubject
- do this 20-30 times, never see the issue. 


The stack trace can be misleading, because it points to whatever the app was doing when sgen hits its assertion failure. In our production app, I've seen the top of the stack trace be when allocating memory for string.Format.
Comment 1 drichnak 2015-12-22 23:26:05 UTC
Below is a sample error in xcode from the demo app: 


Dec 22 14:58:39 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Generating memory pressure...
Dec 22 14:58:40 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Disposing BehaviorSubject...
Dec 22 14:58:41 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Generating memory pressure...
Dec 22 14:58:43 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Disposing BehaviorSubject...
Dec 22 14:58:44 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Generating memory pressure...
Dec 22 14:58:46 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Disposing BehaviorSubject...
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: Generating memory pressure...
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: error: * Assertion: should not be reached at ../../../../../mono/mono/sgen/sgen-scan-object.h:101
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical: Stacktrace:
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at <unknown> <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at (wrapper managed-to-native) System.Reflection.MonoCMethod.InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at System.Reflection.MonoCMethod.InternalInvoke (object,object[]) [0x00002] in /Users/builder/data/lanes/2377/73229919/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:644
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at System.Reflection.MonoCMethod.DoInvoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) [0x00089] in /Users/builder/data/lanes/2377/73229919/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:635
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at System.Reflection.MonoCMethod.Invoke (System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) [0x00000] in /Users/builder/data/lanes/2377/73229919/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/corlib/System.Reflection/MonoMethod.cs:663
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at System.Reflection.ConstructorInfo.Invoke (object[]) [0x00000] in /Users/builder/data/lanes/2377/73229919/source/maccore/_build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/src/mono/mcs/class/corlib/System.Reflection/ConstructorInfo.cs:62
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at ObjCRuntime.Runtime.ConstructNSObject<T_REF> (intptr,System.Type,ObjCRuntime.Runtime/MissingCtorResolution) <0x000ff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at ObjCRuntime.Runtime.GetNSObject<T_REF> (intptr) <0x001af>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at UIKit.UIImage.FromBundle (string) [0x00023] in /Users/builder/data/lanes/2377/73229919/source/maccore/src/build/ios/native/UIKit/UIImage.g.cs:423
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at Demo1.WithBehaviorSubjectViewController.ViewDidAppear (bool) [0x00026] in /Users/drichnak/Projects/Demo1/Demo1/WithBehaviorSubjectViewController.cs:30
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at <unknown> <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at UIKit.UIApplication.Main (string[],intptr,intptr) [0x00005] in /Users/builder/data/lanes/2377/73229919/source/maccore/src/UIKit/UIApplication.cs:77
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at UIKit.UIApplication.Main (string[],string,string) [0x0001c] in /Users/builder/data/lanes/2377/73229919/source/maccore/src/UIKit/UIApplication.cs:60
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at Demo1.Application.Main (string[]) [0x00008] in /Users/drichnak/Projects/Demo1/Demo1/Main.cs:12
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) <0xffffffff>
Dec 22 14:58:47 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical: 
    Native stacktrace:
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   0   Demo1                               0x00989765 mono_handle_native_sigsegv + 240
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   1   libsystem_platform.dylib            0x21f4b85f _sigtramp + 42
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   2   libsystem_pthread.dylib             0x21f4fb47 pthread_kill + 62
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   3   libsystem_c.dylib                   0x21e440c5 abort + 108
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   4   Demo1                               0x00a28fd0 _ZL12log_callbackPKcS0_S0_iPv + 80
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   5   Demo1                               0x00a1c3b1 log_adapter + 164
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   6   Demo1                               0x00a2404d monoeg_assertion_message + 84
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   7   Demo1                               0x00a092df simple_nursery_serial_scan_object + 1170
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   8   Demo1                               0x009ffd45 major_scan_card_table + 536
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   9   Demo1                               0x009f2b05 sgen_card_table_scan_remsets + 32
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   10  Demo1                               0x00a0be51 sgen_workers_enqueue_job + 32
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   11  Demo1                               0x009f9b83 collect_nursery + 738
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   12  Demo1                               0x009f94cf sgen_perform_collection + 766
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   13  Demo1                               0x009f1ec7 sgen_alloc_obj_nolock + 610
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   14  Demo1                               0x009f2315 sgen_alloc_obj + 112
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   15  Demo1                               0x009e1695 mono_gc_alloc_obj + 8
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   16  Demo1                               0x009d7ab3 mono_runtime_invoke_array + 1190
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   17  Demo1                               0x00230b94 wrapper_managed_to_native_System_Reflection_MonoCMethod_InternalInvoke_System_Reflection_MonoCMethod_object_object___System_Exception_ + 128
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   18  Demo1                               0x00230ecc System_Reflection_MonoCMethod_InternalInvoke_object_object__ + 68
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   19  Demo1                               0x00230de8 System_Reflection_MonoCMethod_DoInvoke_object_System_Reflection_BindingFlags_System_Reflection_Binder_object___System_Globalization_CultureInfo + 240
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   20  Demo1                               0x00230f90 System_Reflection_MonoCMethod_Invoke_System_Reflection_BindingFlags_System_Reflection_Binder_object___System_Globalization_CultureInfo + 80
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   21  Demo1                               0x0022a7b8 System_Reflection_ConstructorInfo_Invoke_object__ + 124
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   22  Demo1                               0x000e2dc8 ObjCRuntime_Runtime_ConstructNSObject_T_REF_intptr_System_Type_ObjCRuntime_Runtime_MissingCtorResolution + 256
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   23  Demo1                               0x000e3628 ObjCRuntime_Runtime_GetNSObject_T_REF_intptr + 432
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   24  Demo1                               0x000daf2c UIKit_UIImage_FromBundle_string + 204
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   25  Demo1                               0x000d2068 Demo1_WithBehaviorSubjectViewController_ViewDidAppear_bool + 372
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   26  Demo1                               0x002b50f4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   27  Demo1                               0x0099202f mono_jit_runtime_invoke + 1150
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   28  Demo1                               0x009d3b45 mono_runtime_invoke + 88
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   29  Demo1                               0x0096363d _ZL30native_to_managed_trampoline_7P11objc_objectP13objc_selectorPP11_MonoMethodaPKcS7_S7_ + 148
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   30  Demo1                               0x0096384d -[WithBehaviorSubjectViewController viewDidAppear:] + 80
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   31  UIKit                               0x263c6217 <redacted> + 674
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   32  UIKit                               0x263c67a3 <redacted> + 258
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   33  UIKit                               0x264826bf <redacted> + 986
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   34  UIKit                               0x2655d7ab <redacted> + 210
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   35  UIKit                               0x264dac77 <redacted> + 90
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   36  UIKit                               0x26640dc7 <redacted> + 670
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   37  UIKit                               0x263e8bdd <redacted> + 540
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   38  UIKit                               0x263e86b9 <redacted> + 204
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   39  UIKit                               0x263e85b3 <redacted> + 78
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   40  QuartzCore                          0x2448c59f <redacted> + 254
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   41  libdispatch.dylib                   0x21db3dc3 <redacted> + 22
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   42  libdispatch.dylib                   0x21db8671 _dispatch_main_queue_callback_4CF + 1532
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   43  CoreFoundation                      0x221d8fc5 <redacted> + 8
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   44  CoreFoundation                      0x221d74bf <redacted> + 1590
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   45  CoreFoundation                      0x22129bb9 CFRunLoopRunSpecific + 516
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   46  CoreFoundation                      0x221299ad CFRunLoopRunInMode + 108
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   47  GraphicsServices                    0x233a3af9 GSEventRunModal + 160
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   48  UIKit                               0x26415fb5 UIApplicationMain + 144
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   49  Demo1                               0x00117cd0 wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 272
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   50  Demo1                               0x000d9d08 UIKit_UIApplication_Main_string___intptr_intptr + 52
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   51  Demo1                               0x000d9cc8 UIKit_UIApplication_Main_string___string_string + 204
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   52  Demo1                               0x000d014c Demo1_Application_Main_string__ + 188
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   53  Demo1                               0x002b50f4 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 256
Dec 22 14:58:48 Uranus-iPhone-6-Plus com.apple.xpc.launchd[1] (UIKitApplication:com.woot.demo1[0xde61][2449]) <Notice>: Service exited due to signal: Abort trap: 6
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   54  Demo1                               0x0099202f mono_jit_runtime_invoke + 1150
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   55  Demo1                               0x009d3b45 mono_runtime_invoke + 88
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   56  Demo1                               0x009d6fab mono_runtime_exec_main + 282
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   57  Demo1                               0x00a3fbf4 xamarin_main + 2072
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   58  Demo1                               0x00964301 main + 112
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical:   59  libdyld.dylib                       0x21ddc873 <redacted> + 2
Dec 22 14:58:48 Uranus-iPhone-6-Plus Demo1[2449] <Warning>: critical: 
    =================================================================
    Got a SIGABRT while executing native code. This usually indicates
    a fatal error in the mono runtime or one of the native libraries 
    used by your application.
    =================================================================
Dec 22 14:58:48 Uranus-iPhone-6-Plus SpringBoard[58] <Warning>: HW kbd: Failed to set (null) as keyboard focus
Dec 22 14:58:48 Uranus-iPhone-6-Plus diagnosticd[85] <Error>: error evaluating process info - pid: 2449, puniqueid: 2449
Dec 22 14:58:48 Uranus-iPhone-6-Plus ReportCrash[2450] <Notice>: Formulating report for corpse[2449] Demo1
Dec 22 14:58:48 Uranus-iPhone-6-Plus ReportCrash[2450] <Warning>: saved type '109_Demo1' report (2 of max 25) as /var/mobile/Library/Logs/CrashReporter/Demo1_2015-12-22-145848_Uranus-iPhone-6-Plus.ips
Dec 22 14:58:48 Uranus-iPhone-6-Plus SpringBoard[58] <Warning>: Application 'UIKitApplication:com.woot.demo1[0xde61]' crashed.
Dec 22 14:58:48 Uranus-iPhone-6-Plus UserEventAgent[26] <Warning>: 1657037047642: id=com.woot.demo1 pid=2449, state=0
Comment 2 Ludovic Henry 2016-01-19 12:32:55 UTC
I can easily reproduce on a iPad mini with the provided repro informations.
Comment 3 Zoltan Varga 2016-01-19 19:20:43 UTC
Looks like a dup of:
https://bugzilla.xamarin.com/show_bug.cgi?id=37079
Comment 4 Rolf Bjarne Kvinge [MSFT] 2016-01-20 10:03:16 UTC
According to the customer for bug #37079 that was not a problem with C6 (it showed up between two preview releases of C7). Before backporting the fix for #37079 maybe we should confirm that fix really fixes this bug as well (i.e. that it really is a dup)?
Comment 10 Arpit Jha 2016-03-01 12:09:47 UTC
******************
Reproduce Status
*****************

I have Reproduced this issue with XI 9.2.1.54.pkg.

Application Output: https://gist.github.com/Rajneesh360Logica/c29721c6f2b2c6fd03c0

Environment Info: https://gist.github.com/Rajneesh360Logica/7b7f3702896bf667d85b


***************
Verify Status
***************
I have checked this issue with latest C6SR2 builds and is working fine.Now, I am not getting any exception.

Screencast: http://www.screencast.com/t/w5U1JtG41

Application Output: https://gist.github.com/Rajneesh360Logica/eed09f2a7a07804c6a3e

IDE Logs: https://gist.github.com/Rajneesh360Logica/008f7790ea5df12db844

Environment Info: https://gist.github.com/Rajneesh360Logica/1854735e73cec74777e6
Comment 11 Sunil Kumar 2016-03-03 14:02:10 UTC
I have checked this issue with latest C6SR2 build monotouch-9.4.2.24_49ba15e7cf212c857177a3ad54973ed9f0021aa7 and observed that now this issue works fine. I am not getting any exception on running the attached sample.

Screencast:  http://www.screencast.com/t/j7igVdCkTVw
Application Output: https://gist.github.com/sunil360/7c6c9ead49f40f53bd86

Environment info:
https://gist.github.com/sunil360/6d227d2e259afff772ee