windows-server-2008 – IIS7 w3wp进程挂起循环

在尝试回收时,单个服务器已经开始有时会离开zombie w3wp.exe进程.一个新的进程正确生成,一切似乎都有效,除了旧的进程仍然存在并占用内存.任务管理器报告只留下一个线程,远离通常有40到70个线程的活动线程.

使用ProcDump我已经采用了完整的内存转储来进一步分析WinDbg.该机器是WinDbg所述的Server 2008 R2 x64 8核心机器：

Windows 7 Version 7600 MP (8 procs) Free x64

加载sos后,托管线程的打印输出显示以下内容：

0:000> !threads
ThreadCount: 19
UnstartedThread: 0
BackgroundThread: 19
PendingThread: 0
DeadThread: 0
Hosted Runtime: no
                                              PreEmptive                                                Lock
       ID OSID        ThreadOBJ     State   GC     GC Alloc Context                  Domain           Count APT Exception
XXXX    1  9d0 000000000209b4c0      8220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX    2  c60 00000000020c3130      b220 Enabled  000000013fbe5ed0:000000013fbe7da8 000000000208e770     0 MTA (Finalizer)
XXXX    3  a24 00000000020f0d60   880a220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 MTA (Threadpool Completion Port)
XXXX    4  97c 0000000002105180    80a220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 MTA (Threadpool Completion Port)
XXXX    5  c28 000000000210bfe0      1220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX    6  d40 00000000053f9080   180b220 Enabled  00000001bfe75d20:00000001bfe767c8 000000000208e770     0 MTA (Threadpool Worker)
XXXX    7  c18 00000000053f9b30   180b220 Enabled  00000000fff95880:00000000fff97210 000000000208e770     0 MTA (Threadpool Worker)
XXXX    8  f7c 00000000053fa5e0   180b220 Enabled  000000011fbea268:000000011fbea920 000000000208e770     0 MTA (Threadpool Worker)
XXXX    9  91c 00000000053fb090   180b220 Enabled  00000001dfc39138:00000001dfc39670 000000000208e770     0 MTA (Threadpool Worker)
XXXX    a  fb0 00000000053fbd20   180b220 Enabled  00000000fff922b0:00000000fff93210 000000000208e770     0 MTA (Threadpool Worker)
XXXX    b  fc8 00000000053fc9b0   180b220 Enabled  0000000160053ea0:0000000160054778 000000000208e770     0 MTA (Threadpool Worker)
XXXX    c  538 00000000053fd460   180b220 Enabled  000000017fd8fc98:000000017fd911f8 000000000208e770     0 MTA (Threadpool Worker)
XXXX    d  604 00000000053fdf10   180b220 Enabled  000000019fd7aa78:000000019fd7c648 000000000208e770     0 MTA (Threadpool Worker)
   0    f  2cc 0000000005514c60       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX   10  9bc 00000000020a90c0       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX   11  9c0 00000000056b7a00       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX    e  9d4 00000000056b7fd0       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX   12  9d8 00000000056b85a0       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn
XXXX   13  cb8 00000000056b8b70       220 Enabled  0000000000000000:0000000000000000 000000000208e770     0 Ukn

然而,更感兴趣的可能是单个非托管线程剩余的堆栈回溯的输出：

0:000> ~* kb 2000

.  0  Id: 85c.2cc Suspend: -1 Teb: 000007ff`fffd3000 Unfrozen
RetAddr           : Args to Child                                                           : Call Site
000007fe`fdcc1843 : 00000000`00fd6b60 00000000`00fd6b60 ffffffff`ffffffff 00000000`77bc04a0 : ntdll!ZwClose+0xa
00000000`77ab2c41 : 00000000`77bc1670 00000000`00000000 00000000`77bc04a0 7fffffff`ffffffff : KERNELBASE!CloseHandle+0x13
000007fe`f56537c6 : 00000000`00000000 00000000`00000000 00000000`012da080 000007fe`f5442eac : kernel32!CloseHandleImplementation+0x3d
000007fe`f54443d2 : 00000000`00000007 000007fe`f5443d3c 00000000`00000000 00000000`77bc9997 : httpapi!HttpCloseRequestQueue+0xa
000007fe`f54444c3 : 00000000`00000000 00000000`012e6900 00000000`00000000 00000000`77bd5afa : w3dt!UL_APP_POOL::Cleanup+0x62
000007fe`f549384a : 00000000`012da080 00000000`00c93a28 00000000`012e6900 00000000`00000000 : w3dt!WP_CONTEXT::CleanupOutstandingRequests+0x83
000007fe`f549417a : 00000000`00000000 00000000`0000ffff 00000000`00000000 00000000`77bcf9fd : iiscore!W3_SERVER::StopListen+0x4a
000007fe`f562b5bf : 00000000`012d2f30 00000000`00000000 00000000`00000000 00000000`0000ffff : iiscore!IISCORE_PROTOCOL_MANAGER::StopListenerChannel+0x5a
000007fe`f5626e8f : 00000000`012d2f30 00000000`00000000 00000000`00424380 00000000`00000000 : w3wphost!LISTENER_CHANNEL_STOP_WORKITEM::ExecuteWorkItem+0x7b
00000000`77bcf8eb : 00000000`021782b0 00000000`021782b0 00000000`00000000 00000000`00000001 : w3wphost!W3WP_HOST::ExecuteWorkItem+0xf
00000000`77bc9d9f : 00000000`00000000 00000000`012d2f30 00000000`00424380 00000000`010aa528 : ntdll!RtlpTpWorkCallback+0x16b
00000000`77aaf56d : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!TppWorkerThread+0x5ff
00000000`77be3281 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0xd
00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x1d

从堆栈跟踪中可以看出,w3wp进程正在尝试关闭并执行其清理任务,但由于某种原因,ntdll！ZwClose正在挂起.它被挂了好几天没有变化 – 除了增加内存使用量之外没有明显的副作用.

w3wp进程不会一直挂起,我还没有找到可重现的模式.在此期间,有任何进一步调试的建议吗？