windbg + sos 調試w3wp進程內存崩潰問題
1.加載符合文件
C:\symbols;SRV*C:\symbols*http://msdl.microsoft.com/download/symbols;

2.加載sos.dll
.load C:\Windows\Microsoft.NET\Framework\v2.0.50727\SOS.dll

3.查看托管堆里面的對象大小
！dumpheap -stat
72a52524???? 4780???? 19149568 System.Int64[]
66300224? 1404204???? 22467264 System.ServiceModel.Description.XmlName
01239298???? 3170???? 25187084????? Free
6f75ac00? 1692875???? 40629000 System.Xml.XmlDictionaryString
72a40d1c??? 60413???? 47153628 System.Reflection.Emit.__FixupData[]
66301d38?? 979563???? 50937276 System.ServiceModel.Description.MessagePartDescription
6f75b8a8?? 143024???? 59241664 System.Collections.Generic.Dictionary`2+Entry[[System.String, mscorlib],[System.Xml.XmlDictionaryString, System.Runtime.Serialization]][]
72a52ee4?? 634786???? 82323112 System.Int32[]
72a53498?? 154589???? 83105136 System.Collections.Hashtable+bucket[]
72a24518? 2153323???? 89750416 System.Object[]
72a50d48? 4210817??? 305563628 System.String
72a537b8?? 526411??? 309971176 System.Byte[]

4.針對結果集里面的大對象，執行！dumpheap -mt 方法表地址
1984e140 72a537b8?? 262160??? ?
19892618 72a537b8?? 131088??? ?
198b2628 72a537b8?? 131088??? ?
198d2638 72a537b8?? 131088??? ?
1990f488 72a537b8?? 131088??? ?
1992f4a8 72a537b8?? 262160??? ?
1998af48 72a537b8?? 262160??? ?
199caf68 72a537b8?? 262160??? ?
19a0af78 72a537b8?? 131088??? ?
19a2cfb0 72a537b8?? 262160??? ?
19a6cfc0 72a537b8?? 262160??? ?
19aacfe0 72a537b8?? 262160??? ?
19aecff0 72a537b8?? 131088??? ?
19b0f028 72a537b8?? 131088??? ?
19b35090 72a537b8?? 131088??? ?
19b550a0 72a537b8?? 262160??? ?
上圖列出了這類對象里面的單個對象大小。
再對它進行一次過濾，!dumpheap -min 85000 -mt 方法表地址
? Adress?? MT????????? Size
1984e140 72a537b8?? 262160??? ?
19892618 72a537b8?? 131088??? ?
198b2628 72a537b8?? 131088??? ?
198d2638 72a537b8?? 131088??? ?
1990f488 72a537b8?? 131088??? ?
1992f4a8 72a537b8?? 262160??? ?
1998af48 72a537b8?? 262160??? ?
199caf68 72a537b8?? 262160??? ?
19a0af78 72a537b8?? 131088??? ?
19a2cfb0 72a537b8?? 262160??? ?
19a6cfc0 72a537b8?? 262160??? ?
19aacfe0 72a537b8?? 262160??? ?
19aecff0 72a537b8?? 131088??? ?
19b0f028 72a537b8?? 131088??? ?
19b35090 72a537b8?? 131088??? ?
19b550a0 72a537b8?? 262160??? ?
5.查看大對象的根，!gcroot 1984e140
Note: Roots found on stacks may be false positives. Run "!help gcroot" for
more info.
Scan Thread 7 OSTHread 13d8
Scan Thread 21 OSTHread 10e4
Scan Thread 22 OSTHread 1764
Scan Thread 23 OSTHread 668
Scan Thread 24 OSTHread 10f8
Scan Thread 25 OSTHread 1334
Scan Thread 26 OSTHread 1244
ESP:1c2dfb50: 1c2dfb88 (invalid object)
ESP:1c2dfc28: 1c2dfbec (invalid object)
ESP:1c2dfc2c: 1c2dfbec (invalid object)
ESP:1c2dfc64: 1c2dfbec (invalid object)
Scan Thread 27 OSTHread 1164
Scan Thread 29 OSTHread 14f0
Scan Thread 2 OSTHread a74
Scan Thread 35 OSTHread 8a0
Scan Thread 36 OSTHread 15d8
Scan Thread 37 OSTHread 17f4
Scan Thread 38 OSTHread 162c
Scan Thread 39 OSTHread 120c
Scan Thread 40 OSTHread 930
Scan Thread 41 OSTHread 15bc
Scan Thread 42 OSTHread a54
Scan Thread 44 OSTHread f8
Scan Thread 46 OSTHread 17d4
DOMAIN(01280308):HANDLE(Pinned):d013fc:Root:1206db58(System.Object[])->

6.找到對應代碼，檢查問題。

轉載于:https://www.cnblogs.com/363546828/p/5687619.html

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