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Coredumps in Alpine

This guide is meant to complement the generating and analyzing guides already available. These instructions are specific to Alpine and have been tested using coredumps.alpine.yaml

Unfortunately the createdump utility is broken in Alpine containers. See the below thread for details. Due to this bug we will be forced to generate a full coredump.

https://github.com/dotnet/coreclr/issues/24599

Alpine coredumps

Using the .NET Core pid run createdump in full mode. Note how large these dumps are. If you are running against using .NET Core 3.0+ then you should be able to use dotnet dump itself to generate the dump.

# /usr/share/dotnet/shared/Microsoft.NETCore.App/2.2.5/createdump --full 7
Writing full dump to file /tmp/coredump.7
Written 11171069952 bytes (2727312 pages) to core file

# ls -al /tmp
...
-rw-r--r--    1 root     root     11171229696 Jun 23 12:25 coredump.7

Use dotnet dump to analyze. See the official documentation for help.

Below you will see some examples of some instructions run against dump taken from the sample app.

/ # dotnet dump analyze /tmp/coredump.7

> clrstack
OS Thread Id: 0x7 (0)
        Child SP               IP Call Site
00007FFF276AE3C0 00007f38c66463ad [GCFrame: 00007fff276ae3c0]
00007FFF276AE4A0 00007f38c66463ad [HelperMethodFrame_1OBJ: 00007fff276ae4a0] System.Threading.Monitor.ObjWait(Boolean, Int32, System.Object)
00007FFF276AE5D0 00007F384C0CD4A2 System.Threading.ManualResetEventSlim.Wait(Int32, System.Threading.CancellationToken)
00007FFF276AE660 00007F384C0989E9 System.Threading.Tasks.Task.SpinThenBlockingWait(Int32, System.Threading.CancellationToken) [/root/coreclr/src/mscorlib/src/System/Threading/Tasks/Task.cs @ 2959]
00007FFF276AE6C0 00007F384C098879 System.Threading.Tasks.Task.InternalWaitCore(Int32, System.Threading.CancellationToken) [/root/coreclr/src/mscorlib/src/System/Threading/Tasks/Task.cs @ 2898]
00007FFF276AE720 00007F384C0B96B6 System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task) [/root/coreclr/src/mscorlib/src/System/Runtime/CompilerServices/TaskAwaiter.cs @ 146]
00007FFF276AE740 00007F384C765527 Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(Microsoft.AspNetCore.Hosting.IWebHost) [/_/src/Microsoft.AspNetCore.Hosting/WebHostExtensions.cs @ 66]
00007FFF276AE760 00007F384C5B1B6E sample_netcore_app.Program.Main(System.String[])
00007FFF276AEA48 00007f38c575cfcf [GCFrame: 00007fff276aea48]
00007FFF276AEF10 00007f38c575cfcf [GCFrame: 00007fff276aef10]

> clrthreads
ThreadCount:      10
UnstartedThread:  0
BackgroundThread: 7
PendingThread:    0
DeadThread:       2
Hosted Runtime:   no
                                                                                                        Lock
 DBG   ID OSID ThreadOBJ           State GC Mode     GC Alloc Context                  Domain           Count Apt Exception
   0    1    7 000055F9D46F0D20  2020020 Preemptive  00007F362BDD6E28:00007F362BDD7FD0 000055F9D46D1F60 0     Ukn
   8    2   15 000055F9D4865C60    21220 Preemptive  0000000000000000:0000000000000000 000055F9D46D1F60 0     Ukn (Finalizer)
   9    3   16 000055F9D487A580  1020220 Preemptive  0000000000000000:0000000000000000 000055F9D46D1F60 0     Ukn (Threadpool Worker)
  10    4   17 000055F9D48EA400    21220 Preemptive  00007F372B8ED1D8:00007F372B8EDFD0 000055F9D46D1F60 0     Ukn
XXXX    5    0 000055F9D48F3760  1031820 Preemptive  0000000000000000:0000000000000000 000055F9D46D1F60 0     Ukn (Threadpool Worker)
  11    6   1a 000055F9D48F67E0  1021220 Preemptive  00007F372B903EE0:00007F372B903FD0 000055F9D46D1F60 0     Ukn (Threadpool Worker)
  12    7   1b 000055F9D49A7C00  2021220 Preemptive  00007F362BC76408:00007F362BC77FD0 000055F9D46D1F60 0     Ukn
XXXX    8    0 000055F9D4A99FE0  1031820 Preemptive  0000000000000000:0000000000000000 000055F9D46D1F60 0     Ukn (Threadpool Worker)
  14    9   1e 000055F9D4A9BC80    21220 Preemptive  00007F362BDD80D0:00007F362BDD9FD0 000055F9D46D1F60 0     Ukn
  15   10   87 000055F9D48F5E40  1021220 Preemptive  00007F362BDDCDC0:00007F362BDDDFD0 000055F9D46D1F60 0     Ukn (Threadpool Worker)

> dumpheap -type FibonacciProvider
         Address               MT     Size
00007f372b950038 00007f384e086cd0       24

Statistics:
              MT    Count    TotalSize Class Name
00007f384e086cd0        1           24 sample_netcore_app.Providers.FibonacciProvider

> gcroot 00007f372b950038

Thread 7:
    00007FFF276AE660 00007F384C0989E9 System.Threading.Tasks.Task.SpinThenBlockingWait(Int32, System.Threading.CancellationToken) [/root/coreclr/src/mscorlib/src/System/Threading/Tasks/Task.cs @ 2959]
        rbp-38: 00007fff276ae678
            ->  00007F362BDD6D58 System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1+AsyncStateMachineBox`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib],[Microsoft.AspNetCore.Hosting.WebHostExtensions+<RunAsync>d__4, Microsoft.AspNetCore.Hosting]]
            ->  00007F362B961BA8 Microsoft.AspNetCore.Hosting.Internal.WebHost
            ->  00007F362B95FD60 Microsoft.Extensions.DependencyInjection.ServiceCollection
            ->  00007F362B95FD78 System.Collections.Generic.List`1[[Microsoft.Extensions.DependencyInjection.ServiceDescriptor, Microsoft.Extensions.DependencyInjection.Abstractions]]
            ->  00007F362BC28DC0 Microsoft.Extensions.DependencyInjection.ServiceDescriptor[]
            ->  00007F362B93FF38 Microsoft.Extensions.DependencyInjection.ServiceDescriptor
            ->  00007F362B93CA30 Microsoft.AspNetCore.Hosting.WebHostBuilderContext
            ->  00007F362B948C70 Microsoft.Extensions.Configuration.ConfigurationRoot
            ->  00007F362B948C90 Microsoft.Extensions.Configuration.ConfigurationReloadToken
            ->  00007F362B948CA8 System.Threading.CancellationTokenSource
            ->  00007F362BC3AFB8 System.Threading.CancellationTokenSource+CallbackPartition[]
            ->  00007F362BC3AFE0 System.Threading.CancellationTokenSource+CallbackPartition
            ->  00007F362BDCA070 System.Threading.CancellationTokenSource+CallbackNode
            ->  00007F362BDCA030 System.Action`1[[System.Object, System.Private.CoreLib]]
            ->  00007F362BDCA008 Microsoft.Extensions.Primitives.ChangeToken+<>c__DisplayClass1_0`1[[System.String, System.Private.CoreLib]]
            ->  00007F362BDC9FC8 System.Action`1[[System.String, System.Private.CoreLib]]
            ->  00007F362BDC9F20 Microsoft.Extensions.Options.OptionsMonitor`1[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering]]
            ->  00007F362BDCA4F8 System.Action`2[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering],[System.String, System.Private.CoreLib]]
            ->  00007F362BDCA4D8 Microsoft.Extensions.Options.OptionsMonitor`1+ChangeTrackerDisposable[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering]]
            ->  00007F362BDCA498 System.Action`2[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering],[System.String, System.Private.CoreLib]]
            ->  00007F362BDCA480 Microsoft.Extensions.Options.OptionsMonitorExtensions+<>c__DisplayClass0_0`1[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering]]
            ->  00007F362BDCA440 System.Action`1[[Microsoft.AspNetCore.HostFiltering.HostFilteringOptions, Microsoft.AspNetCore.HostFiltering]]
            ->  00007F362BDCA110 Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware
            ->  00007F362BDC6588 Microsoft.AspNetCore.Http.RequestDelegate
            ->  00007F362BDC6550 Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware
            ->  00007F362BDC38D8 Microsoft.AspNetCore.Routing.Matching.DfaMatcherFactory
            ->  00007F362BC29F10 Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope
            ->  00007F362BC3FB10 System.Collections.Generic.List`1[[System.IDisposable, System.Private.CoreLib]]
            ->  00007F362BC4F670 System.IDisposable[]
            ->  00007F362BC4DF88 Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer
            ->  00007F362BC4F168 System.Collections.Generic.List`1[[Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal.ITransport, Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions]]
            ->  00007F362BDD46A8 Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions.Internal.ITransport[]
            ->  00007F362BDD3738 Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransport
            ->  00007F362BDD3080 Microsoft.AspNetCore.Server.Kestrel.Core.AnyIPListenOptions
            ->  00007F362BDD32D0 System.Collections.Generic.List`1[[System.Func`2[[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions],[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions]], System.Private.CoreLib]]
            ->  00007F362BDD3648 System.Func`2[[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions],[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions]][]
            ->  00007F362BDD3608 System.Func`2[[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions],[Microsoft.AspNetCore.Connections.ConnectionDelegate, Microsoft.AspNetCore.Connections.Abstractions]]
            ->  00007F362BDD35C0 Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnectionBuilderExtensions+<>c__DisplayClass1_0`1[[Microsoft.AspNetCore.Hosting.Internal.HostingApplication+Context, Microsoft.AspNetCore.Hosting]]
            ->  00007F362BDD35D8 Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnectionMiddleware`1[[Microsoft.AspNetCore.Hosting.Internal.HostingApplication+Context, Microsoft.AspNetCore.Hosting]]
            ->  00007F362BDCE760 Microsoft.AspNetCore.Hosting.Internal.HostingApplication
            ->  00007F362BDCB2D8 Microsoft.AspNetCore.Http.RequestDelegate
            ->  00007F362BDCB2B8 Microsoft.AspNetCore.Hosting.Internal.RequestServicesContainerMiddleware
            ->  00007F362BC29E80 Microsoft.Extensions.DependencyInjection.ServiceLookup.DynamicServiceProviderEngine
            ->  00007F362BC32010 System.Collections.Concurrent.ConcurrentDictionary`2[[System.Type, System.Private.CoreLib],[System.Func`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection],[System.Object, System.Private.CoreLib]], System.Private.CoreLib]]
            ->  00007F362BDBEDB0 System.Collections.Concurrent.ConcurrentDictionary`2+Tables[[System.Type, System.Private.CoreLib],[System.Func`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection],[System.Object, System.Private.CoreLib]], System.Private.CoreLib]]
            ->  00007F362BDBE5B8 System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.Type, System.Private.CoreLib],[System.Func`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection],[System.Object, System.Private.CoreLib]], System.Private.CoreLib]][]
            ->  00007F372B950008 System.Collections.Concurrent.ConcurrentDictionary`2+Node[[System.Type, System.Private.CoreLib],[System.Func`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection],[System.Object, System.Private.CoreLib]], System.Private.CoreLib]]
            ->  00007F372B9822D8 System.Func`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope, Microsoft.Extensions.DependencyInjection],[System.Object, System.Private.CoreLib]]
            ->  00007F372B9822C0 Microsoft.Extensions.DependencyInjection.ServiceLookup.ExpressionResolverBuilder+<>c__DisplayClass17_1
            ->  00007F372B950038 sample_netcore_app.Providers.FibonacciProvider