critical section blocking (deadlock?)
In the critical section of a multithreaded thread, it is not locked, but it is blocking. It occurs frequently in 2 ~ 3 times in 10 and it is only occurred in debug build so far. I have tested about 40,000 times in release build, but it is not reported yet.
The debugging information looks like this: In the first case, It is blocked even though the waiting thread is alone. If you have any experience in this situation, I would appreciate your advice.
Environment windows 7 sp1 vc ++ 2013 pro
0:008> !critsec 5536b5f4
CritSec CommonManager!oInstance+2c at 5536b5f4
LockCount NOT LOCKED
RecursionCount 0
OwningThread 0
EntryCount 0
ContentionCount 4
*** Locked
0:008> dt RTL_CRITICAL_SECTION 5536b5f4
TRExecutor!RTL_CRITICAL_SECTION
+0x000 DebugInfo : 0x0079a640 _RTL_CRITICAL_SECTION_DEBUG
+0x004 LockCount : 0n-7
+0x008 RecursionCount : 0n0
+0x00c OwningThread : (null)
+0x010 LockSemaphore : 0x00000234 Void
+0x014 SpinCount : 0
0:008> ? 0x1 & (-0n7)
Evaluate expression: 1 = 00000001
0:008> ? (0x2 & (-0n7)) >> 1
Evaluate expression: 0 = 00000000
0:008> ? ((-1) - (-0n7)) >> 2
Evaluate expression: 1 = 00000001
case 1
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Starting New Debugger Session
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Microsoft (R) Windows Debugger Version 6.3.9600.17200 X86
Copyright (c) Microsoft Corporation. All rights reserved.
*** wait with pending attach
Symbol search path is: srv*
Executable search path is:
ModLoad: 76f30000 770b0000 C:\Windows\SysWOW64\ntdll.dll
ModLoad: 756d0000 757e0000 C:\Windows\syswow64\kernel32.dll
...
ModLoad: 762b0000 762f5000 C:\Windows\syswow64\WLDAP32.dll
(b64.274c): Break instruction exception - code 80000003 (first chance)
eax=7ef8d000 ebx=00000000 ecx=00000000 edx=76fcf142 esi=00000000 edi=00000000
eip=76f4000c esp=053ffb44 ebp=053ffb70 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246
ntdll!DbgBreakPoint:
76f4000c cc int 3
0:008> !ntsdexts.locks
Scanned 343 critical sections
0:008> ~8kbn
# ChildEBP RetAddr Args to Child
00 0524ed58 76f7eb4e 00000234 00000000 00000000 ntdll!NtWaitForSingleObject+0x15
01 0524edbc 76f7ea32 00000000 00000000 00000000 ntdll!RtlpWaitOnCriticalSection+0x13e
02 0524ede4 0f57235e 5536b5f4 0524efcc 5536b5e8 ntdll!RtlEnterCriticalSection+0x150
03 0524edf8 55355b4f 0524efc0 0524efcc 00000000 mfc120ud!CCriticalSection::Lock+0x1e
04 0524eee8 55356b2e 0000006a 0524f2ac 0524efcc CommonManager!CCommonManager::GetManager+0x3f
05 0524efc0 00ef9f37 0000006a 0524f238 05165282 CommonManager!GetCommonManager+0x2e
...
14 0524fbb8 76f698f2 00f9ca78 72e8944c 00000000 kernel32!BaseThreadInitThunk+0xe
15 0524fbf8 76f698c5 00f3c170 00f9ca78 00000000 ntdll!__RtlUserThreadStart+0x70
16 0524fc10 00000000 00f3c170 00f9ca78 00000000 ntdll!_RtlUserThreadStart+0x1b
0:008> !threads
Index TID TEB StackBase StackLimit DeAlloc StackSize ThreadProc
0 00000e24 0x7efdd000 0x003d0000 0x003c4000 0x002d0000 0x0000c000 0x0
1 00002314 0x7efda000 0x03ab0000 0x03aaf000 0x039b0000 0x00001000 0x0
2 000020a4 0x7efd7000 0x03f70000 0x03f6e000 0x03e70000 0x00002000 0x0
3 00002f64 0x7ef9f000 0x041b0000 0x041ae000 0x040b0000 0x00002000 0x0
4 000031cc 0x7ef9c000 0x04330000 0x0432d000 0x04230000 0x00003000 0x0
5 000022a8 0x7ef99000 0x04660000 0x0465e000 0x04560000 0x00002000 0x0
6 00001e28 0x7ef96000 0x04560000 0x0455e000 0x04460000 0x00002000 0x0
7 00000688 0x7ef93000 0x04830000 0x0482e000 0x04730000 0x00002000 0x0
8 00002628 0x7ef90000 0x05250000 0x0524c000 0x05150000 0x00004000 0x0
9 0000274c 0x7ef8d000 0x05400000 0x053fc000 0x05300000 0x00004000 0x0
Total VM consumed by thread stacks 0x00022000
0:008> !handle 234 f
Handle 234
Type Event
Attributes 0
GrantedAccess 0x100003:
Synch
QueryState,ModifyState
HandleCount 2
PointerCount 4
Name <none>
Object Specific Information
Event Type Auto Reset
Event is Waiting
0:008> !cs 5536b5f4
-----------------------------------------
Critical section = 0x5536b5f4 (CommonManager!oInstance+0x2C)
DebugInfo = 0x0079a640
NOT LOCKED
LockSemaphore = 0x234
SpinCount = 0x00000000
0:008> !critsec 5536b5f4
CritSec CommonManager!oInstance+2c at 5536b5f4
LockCount NOT LOCKED
RecursionCount 0
OwningThread 0
EntryCount 0
ContentionCount 4
*** Locked
0:008> dt RTL_CRITICAL_SECTION 5536b5f4
TRExecutor!RTL_CRITICAL_SECTION
+0x000 DebugInfo : 0x0079a640 _RTL_CRITICAL_SECTION_DEBUG
+0x004 LockCount : 0n-7
+0x008 RecursionCount : 0n0
+0x00c OwningThread : (null)
+0x010 LockSemaphore : 0x00000234 Void
+0x014 SpinCount : 0
0:008> ? 0x1 & (-0n7)
Evaluate expression: 1 = 00000001
0:008> ? (0x2 & (-0n7)) >> 1
Evaluate expression: 0 = 00000000
0:008> ? ((-1) - (-0n7)) >> 2
Evaluate expression: 1 = 00000001
case 2
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Starting New Debugger Session
-----------------------------------------------------------------------
-----------------------------------------------------------------------
Microsoft (R) Windows Debugger Version 6.3.9600.17200 X86
Copyright (c) Microsoft Corporation. All rights reserved.
*** wait with pending attach
Symbol search path is: srv*
Executable search path is:
ModLoad: 012b0000 01370000 D:\Binary_12.0\Newronz\Debug\TRExecutor.exe
ModLoad: 76f30000 770b0000 C:\Windows\SysWOW64\ntdll.dll
...
ModLoad: 6f770000 6f775000 C:\Windows\system32\msimg32.dll
(27b0.31a4): Break instruction exception - code 80000003 (first chance)
eax=7ef8d000 ebx=00000000 ecx=00000000 edx=76fcf142 esi=00000000 edi=00000000
eip=76f4000c esp=029afa94 ebp=029afac0 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246
ntdll!DbgBreakPoint:
76f4000c cc int 3
0:004> !ntsdexts.locks
Scanned 372 critical sections
0:004> !threads
Index TID TEB StackBase StackLimit DeAlloc StackSize ThreadProc
0 00003080 0x7efdd000 0x00440000 0x00434000 0x00340000 0x0000c000 0x0
1 00002cec 0x7efda000 0x03ac0000 0x03abf000 0x039c0000 0x00001000 0x0
2 00002cf0 0x7efd7000 0x03ee0000 0x03ede000 0x03de0000 0x00002000 0x0
3 00002f6c 0x7ef9f000 0x040d0000 0x040ce000 0x03fd0000 0x00002000 0x0
4 00002cf8 0x7ef9c000 0x041e0000 0x041de000 0x040e0000 0x00002000 0x0
5 0000260c 0x7ef99000 0x043c0000 0x043bd000 0x042c0000 0x00003000 0x0
6 00001b64 0x7ef96000 0x04690000 0x0468e000 0x04590000 0x00002000 0x0
7 00002460 0x7ef93000 0x048b0000 0x048ae000 0x047b0000 0x00002000 0x0
8 00001114 0x7ef90000 0x04ff0000 0x04feb000 0x04ef0000 0x00005000 0x0
9 000031a4 0x7ef8d000 0x029b0000 0x029ac000 0x028b0000 0x00004000 0x0
Total VM consumed by thread stacks 0x00023000
0:003> ~6kbn
# ChildEBP RetAddr Args to Child
00 0468f1ec 76f7eb4e 00000234 00000000 00000000 ntdll!NtWaitForSingleObject+0x15
01 0468f250 76f7ea32 00000000 00000000 0135cf54 ntdll!RtlpWaitOnCriticalSection+0x13e
02 0468f278 0f57235e 5536b5f4 0468f460 5536b5e8 ntdll!RtlEnterCriticalSection+0x150
03 0468f28c 55355b4f 0468f454 0468f460 0135cf54 mfc120ud!CCriticalSection::Lock+0x1e [f:\dd\vctools\vc7libs\ship\atlmfc\include\afxmt.inl @ 111]
04 0468f37c 55356b2e 00000003 0468f54c 0468f460 CommonManager!CCommonManager::GetManager+0x3f
05 0468f454 012c538e 00000003 005ad478 0468f658 CommonManager!GetCommonManager+0x2e
...
0a 0468f858 76f698f2 0135cf54 73bcc10f 00000000 kernel32!BaseThreadInitThunk+0xe
0b 0468f898 76f698c5 012d7a80 0135cf54 00000000 ntdll!__RtlUserThreadStart+0x70
0c 0468f8b0 00000000 012d7a80 0135cf54 00000000 ntdll!_RtlUserThreadStart+0x1b
0:003> ~5kbn
# ChildEBP RetAddr Args to Child
00 043bf8c8 76f7eb4e 00000234 00000000 00000000 ntdll!NtWaitForSingleObject+0x15
01 043bf92c 76f7ea32 00000000 00000000 0135cf54 ntdll!RtlpWaitOnCriticalSection+0x13e
02 043bf954 0f57235e 5536b5f4 043bfb3c 5536b5e8 ntdll!RtlEnterCriticalSection+0x150
03 043bf968 55355b4f 043bfb30 043bfb3c 0135cf54 mfc120ud!CCriticalSection::Lock+0x1e [f:\dd\vctools\vc7libs\ship\atlmfc\include\afxmt.inl @ 111]
04 043bfa58 55356b2e 00000003 043bfc28 043bfb3c CommonManager!CCommonManager::GetManager+0x3f
05 043bfb30 012c538e 00000003 005b2428 043bfd34 CommonManager!GetCommonManager+0x2e
...
0a 043bff34 76f698f2 0135cf54 73efc6e3 00000000 kernel32!BaseThreadInitThunk+0xe
0b 043bff74 76f698c5 012d7a80 0135cf54 00000000 ntdll!__RtlUserThreadStart+0x70
0c 043bff8c 00000000 012d7a80 0135cf54 00000000 ntdll!_RtlUserThreadStart+0x1b
0:003> ~4kbn
# ChildEBP RetAddr Args to Child
00 041df7dc 76f7eb4e 00000234 00000000 00000000 ntdll!NtWaitForSingleObject+0x15
01 041df840 76f7ea32 00000000 00000000 0135cf54 ntdll!RtlpWaitOnCriticalSection+0x13e
02 041df868 0f57235e 5536b5f4 041dfa50 5536b5e8 ntdll!RtlEnterCriticalSection+0x150
03 041df87c 55355b4f 041dfa44 041dfa50 0135cf54 mfc120ud!CCriticalSection::Lock+0x1e [f:\dd\vctools\vc7libs\ship\atlmfc\include\afxmt.inl @ 111]
04 041df96c 55356b2e 00000003 041dfb3c 041dfa50 CommonManager!CCommonManager::GetManager+0x3f
05 041dfa44 012c538e 00000003 005affe8 041dfc48 CommonManager!GetCommonManager+0x2e
...
0a 041dfe48 76f698f2 0135cf54 73c9c71f 00000000 kernel32!BaseThreadInitThunk+0xe
0b 041dfe88 76f698c5 012d7a80 0135cf54 00000000 ntdll!__RtlUserThreadStart+0x70
0c 041dfea0 00000000 012d7a80 0135cf54 00000000 ntdll!_RtlUserThreadStart+0x1b
0:003> !handle 234 f
Handle 234
Type Event
Attributes 0
GrantedAccess 0x100003:
Synch
QueryState,ModifyState
HandleCount 2
PointerCount 6
Name <none>
Object Specific Information
Event Type Auto Reset
Event is Waiting
0:003> !cs 5536b5f4
-----------------------------------------
Critical section = 0x5536b5f4 (CommonManager!oInstance+0x2C)
DebugInfo = 0x0058a640
NOT LOCKED
LockSemaphore = 0x234
SpinCount = 0x00000000
0:003> !critsec 5536b5f4
CritSec CommonManager!oInstance+2c at 5536b5f4
LockCount NOT LOCKED
RecursionCount 0
OwningThread 0
EntryCount 0
ContentionCount 7
*** Locked
0:003> dt RTL_CRITICAL_SECTION 5536b5f4
TRExecutor!RTL_CRITICAL_SECTION
+0x000 DebugInfo : 0x0058a640 _RTL_CRITICAL_SECTION_DEBUG
+0x004 LockCount : 0n-15
+0x008 RecursionCount : 0n0
+0x00c OwningThread : (null)
+0x010 LockSemaphore : 0x00000234 Void
+0x014 SpinCount : 0
0:003> ? 0x1 & (-0n15)
Evaluate expression: 1 = 00000001
0:003> ? (0x2 & (-0n15)) >> 1
Evaluate expression: 0 = 00000000
0:003> ? ((-1) - (-0n15)) >> 2
Evaluate expression: 3 = 00000003
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