Bug 16444 - Interrupting Mono in sdb while it's doing I/O causes io-layer assertion
Summary: Interrupting Mono in sdb while it's doing I/O causes io-layer assertion
Status: RESOLVED INVALID
Alias: None
Product: Runtime
Classification: Mono
Component: io-layer ()
Version: 3.2.x
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Rodrigo Kumpera
URL:
Depends on:
Blocks:
 
Reported: 2013-11-25 17:50 UTC by Alex Rønne Petersen
Modified: 2013-12-06 13:13 UTC (History)
3 users (show)

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

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Status:
RESOLVED INVALID

Description Alex Rønne Petersen 2013-11-25 17:50:03 UTC
alexrp@Zor ~/Projects/tests/cs $ sdb
Welcome to the Mono soft debugger (sdb 1.1.5071.32527)
Type 'help' for a list of commands or 'quit' to exit

(sdb) r test.exe
Inferior process '11234' ('test.exe') started
Hello World
Hello World
Hello World
Hello World
Hello World
Hello World
Hello World
Hello World
Hello Wo^C* Assertion at wthreads.c:1221, condition `prev_handle == INTERRUPTION_REQUESTED_HANDLE' not met

Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Threading.Monitor.try_enter_with_atomic_var (object,int,bool&) <IL 0x0000f, 0xffffffff>
  at System.Threading.Monitor.TryEnter (object,int,bool&) [0x00041] in /home/alexrp/Projects/mono/mcs/class/corlib/System.Threading/Monitor.cs:224
  at System.Threading.Monitor.Enter (object,bool&) [0x00000] in /home/alexrp/Projects/mono/mcs/class/corlib/System.Threading/Monitor.cs:198
  at (wrapper unknown) System.Threading.Monitor.FastMonitorEnterV4 (object,bool&) <IL 0x00059, 0xffffffff>
  at Mono.Debugger.Client.Log.Output (bool,string,string,object[]) [0x00022] in /home/alexrp/Projects/sdb/src/Log.cs:44
  at Mono.Debugger.Client.Log.Info (string,object[]) [0x00009] in /home/alexrp/Projects/sdb/src/Log.cs:60
  at Mono.Debugger.Client.CommandLine.ControlCHandler (int) [0x0001b] in /home/alexrp/Projects/sdb/src/CommandLine.cs:157
  at (wrapper native-to-managed) Mono.Debugger.Client.CommandLine.ControlCHandler (int) <IL 0x00021, 0xffffffff>
  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Threading.WaitHandle.WaitOne_internal (System.Threading.WaitHandle,intptr,int,bool) <IL 0x0001c, 0xffffffff>
  at System.Threading.WaitHandle.WaitOne () [0x00015] in /home/alexrp/Projects/mono/mcs/class/corlib/System.Threading/WaitHandle.cs:357
  at Mono.Debugger.Client.CommandLine.Run (System.Version,bool,bool,System.Collections.Generic.IEnumerable`1<string>,System.Collections.Generic.IEnumerable`1<string>) [0x000d6] in /home/alexrp/Projects/sdb/src/CommandLine.cs:254
  at Mono.Debugger.Client.Program.Main (string[]) [0x00178] in /home/alexrp/Projects/sdb/src/Program.cs:100
  at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <IL 0x0005c, 0xffffffff>

Native stacktrace:

	/opt/mono/bin/mono() [0x4ad63d]
	/lib/x86_64-linux-gnu/libpthread.so.0(+0xfcb0) [0x7f58884c4cb0]
	/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f588812b425]
	/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7f588812eb8b]
	/opt/mono/bin/mono() [0x62f77d]
	/opt/mono/bin/mono() [0x62f8b6]
	/opt/mono/bin/mono() [0x61a95a]
	/opt/mono/bin/mono() [0x6050bf]
	/opt/mono/bin/mono() [0x617ede]
	/opt/mono/bin/mono() [0x5a568d]
	/opt/mono/bin/mono() [0x5a649b]
	[0x4021a610]

Debug info from gdb:

ptrace: Operation not permitted.
No threads.

=================================================================
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.
=================================================================

Aborted
Comment 1 Alex Rønne Petersen 2013-11-25 17:52:01 UTC
Test case:

$ cat test.cs
class Program {
	static void Main () {
		while (true) {
			System.Console.WriteLine ("Hello World");
		}
	}
}
Comment 2 Zoltan Varga 2013-12-03 08:53:51 UTC
sdb executes managed code in signal handlers which is not safe to do since SIGINT is as async signal so the code handling it needs to be async safe.
Use Console.CancelKeyPress instead:
http://msdn.microsoft.com/en-us/library/system.console.cancelkeypress(v=vs.110).aspx
Comment 3 Zoltan Varga 2013-12-06 13:13:11 UTC
-> NOTABUG.