Duplicati server is crashing at tail end of backup. Need help determining what went wrong

Support
1

I’ve been receiving this error on 2.0.4.3 and 2.0.5.1:

$ /usr/bin/mono-sgen /usr/share/Duplicati/updates/2.0.5.1/Duplicati.Server.exe
* Assertion at local-propagation.c:330, condition `ins->opcode > MONO_CEE_LAST' not met

Stacktrace:
at <unknown> <0xffffffff>
at System.Collections.Generic.Dictionary`2<string, int>.Insert (string,int,bool) <0x0006b>
at System.Collections.Generic.Dictionary`2<string, int>.Add (string,int) <0x0001b>
at MimeKit.Utils.CharsetUtils.AddAliases (System.Collections.Generic.Dictionary`2<string, int>,int,int,string[]) <0x0006c>
at MimeKit.Utils.CharsetUtils..cctor () <0x002b3>
at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <0x00062>
at <unknown> <0xffffffff>
at (wrapper managed-to-native) object.__icall_wrapper_mono_generic_class_init (intptr) <0x00059>
at MimeKit.ParserOptions..ctor () <0x000cf>
at MimeKit.ParserOptions..cctor () <0x0007b>
at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <0x00062>
at <unknown> <0xffffffff>
at Duplicati.Library.Modules.Builtin.SendMail.SendMessage (string,string) <0x00157>
at Duplicati.Library.Modules.Builtin.ReportHelper.OnFinish (object) <0x00772>
at Duplicati.Library.Main.Controller.OnOperationComplete (object) <0x002a3>
at Duplicati.Library.Main.Controller.RunAction<T_REF> (T_REF,string[]&,Duplicati.Library.Utility.IFilter&,System.Action`1<T_REF>) <0x00747>
at Duplicati.Library.Main.Controller.Backup (string[],Duplicati.Library.Utility.IFilter) <0x002fb>
at Duplicati.Server.Runner.Run (Duplicati.Server.Runner/IRunnerData,bool) <0x01193>
at Duplicati.Server.Program/<>c.<SetWorkerThread>b__45_0 (Duplicati.Server.Runner/IRunnerData) <0x00017>
at Duplicati.Library.Utility.WorkerThread`1<Tx_REF>.Runner () <0x005da>
at System.Threading.ThreadHelper.ThreadStart_Context (object) <0x00099>
at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) <0x00178>
at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) <0x00020>
at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object) <0x00059>
at System.Threading.ThreadHelper.ThreadStart () <0x0002e>
at (wrapper runtime-invoke) object.runtime_invoke_void__this__ (object,intptr,intptr,intptr) <0x000d1>

What’s most interesting is this one "Duplicati.Library.Modules.Builtin.SendMail.SendMessage. Any tips on how to debug this further?

2

What version of mono do you have? Another user reported an issue like this and it was caused by an old mono version. Duplicati 2.0.5.x requires mono 5.0 or higher.

3

$ mono --version
Mono JIT compiler version 4.6.2 (Debian 4.6.2.7+dfsg-1ubuntu1)

I’ll retry soon with an updated mono version. What’s odd is that this bug just started happening in the last 3 weeks.