用windbg分析一个dead lock的问题

2019-11-17 03:19:18

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难得Winform项目中碰到dead lock,记录一下。

QA报告说，有时候晚上跑完自动化脚本，第二天早上来发现系统hang在屏保界面没反应，从日志看也没有报错。这种属于很少才会发生，也不知道怎么重现，但是很严重的bug，于是抓个dump来研究一下。

# Windbg加载dump文件后的一些文件信息

Microsoft (R) Windows Debugger Version 6.12.0002.633 AMD64

Loading Dump File [F:/DeadLock/Hang.DMP]

User Mini Dump File with Full Memory: Only application data is available

Symbol search path is: *** Invalid ***

****************************************************************************

* Symbol loading may be unreliable without a symbol search path. *

* Use .symfix to have the debugger choose a symbol path. *

* After setting your symbol path, use .reload to refresh symbol locations. *

****************************************************************************

Executable search path is:

Windows 7 Version 7601 (Service Pack 1) MP (4 PRocs) Free x64

Product: WinNt, suite: EmbeddedNT SingleUserTS

Machine Name:

Debug session time: Thu Feb 27 02:47:42.000 2014 (UTC + 8:00)

System Uptime: 4 days 16:41:57.807

Process Uptime: 4 days 16:41:28.000

................................................................

Loading unloaded module list

................................................................

*** ERROR: Symbol file could not be found. Defaulted to export symbols for ntdll.dll -

ntdll!NtWaitForMultipleObjects+0xa:

00000000`7706186a c3 ret

# 设置symbol path

0:000> .sympath srv*c:/MyServerSymbols*http://msdl.microsoft.com/download/symbols

Symbol search path is: srv*c:/MyServerSymbols*http://msdl.microsoft.com/download/symbols

Expanded Symbol search path is: srv*c:/myserversymbols*http://msdl.microsoft.com/download/symbols

#手动load SOS.dll,因为我们的调试机和测试机上的SOS不是同一个版本,所以不用.loadby sos clr

0:000> .load F:/SOS.dll/1008/SOS.dll

#看看线程都在干啥

0:000> ~* e!clrstack

OS Thread Id: 0xfe8 (0)

Child SP IP Call Site

00000000001d5f80 000000007706186a [GCFrame: 00000000001d5f80]

00000000001d6128 000000007706186a [GCFrame: 00000000001d6128]

00000000001d60d8 000000007706186a [HelperMethodFrame_1OBJ: 00000000001d60d8] System.Threading.Monitor.Enter(System.Object)

00000000001d6220 000007ff02b1c734 TheSystem.CCDialog.OnClosed(System.EventArgs)

00000000001d62c0 000007fef18f4695 System.Windows.Forms.Form.CheckCloseDialog(Boolean)*** WARNING: Unable to verify checksum for System.Windows.Forms.ni.dll

00000000001d6330 000007fef1e64073 System.Windows.Forms.Application+ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FContinueMessageLoop(Int32, Int32, MSG[])

00000000001d6470 000007fef12aadbe System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)

00000000001d66b0 000007fef12aa813 System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)

00000000001d6810 000007fef12aa1a1 System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)

00000000001d68a0 000007fef18f8a52 System.Windows.Forms.Form.ShowDialog(System.Windows.Forms.IWin32Window)

00000000001d6c10 000007ff02c844f6 TheSystem.CCMessageBox.ShowInternal(System.Windows.Forms.Form, MessageBoxIcon, System.String, System.String, System.Windows.Forms.MessageBoxButtons, Boolean, System.Collections.Generic.Dictionary`2<System.String,System.String>, System.Windows.Forms.Control, System.Drawing.ContentAlignment)

00000000001d70e0 000007ff02c862cd TheSystem.CCMessageBox.Show(MessageBoxIcon, System.String, System.String, System.Windows.Forms.MessageBoxButtons)

......<cut to save space>......

OS Thread Id: 0x2180 (132)

Child SP IP Call Site

0000000043cad940 000000007706186a [GCFrame: 0000000043cad940]

0000000043cadb98 000000007706186a [GCFrame: 0000000043cadb98]

0000000043cadb48 000000007706186a [HelperMethodFrame: 0000000043cadb48] System.Threading.Monitor.Enter(System.Object)

0000000043cadca0 000007ff02ca8a18 TheSystem.CCDialog.CloseModalDialogs()

0000000043cadd30 000007ff02ca8937 TheSystem.CCUserActivityManager.autoLogoutTimer_Elapsed(System.Object, System.Timers.ElapsedEventArgs)

0000000043cadda0 000007fef5f01b51 System.Timers.Timer.MyTimerCallback(System.Object)

0000000043cade20 000007fef6ba2f78 System.Threading.ExecutionContext.runTryCode(System.Object)

0000000043cae548 000007fef7ba44c4 [HelperMethodFrame_PROTECTOBJ: 0000000043cae548] System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode, CleanupCode, System.Object)

0000000043cae670 000007fef6b91661 System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)

0000000043cae6d0 000007fef6c0ced7 System.Threading._TimerCallback.PerformTimerCallback(System.Object)

0000000043cae948 000007fef7ba44c4 [GCFrame: 0000000043cae948]

0000000043caeb20 000007fef7ba44c4 [DebuggerU2MCatchHandlerFrame: 0000000043caeb20]

......<cut to save space>......

OS Thread Id: 0x363c (1076)

Child SP IP Call Site

00000000d190e7a0 000000007706186a [GCFrame: 00000000d190e7a0]

00000000d190e9f8 000000007706186a [GCFrame: 00000000d190e9f8]

00000000d190e9a8 000000007706186a [HelperMethodFrame: 00000000d190e9a8] System.Threading.Monitor.Ente

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