记一次 redis 事件注册不当导致的内存泄露
线上的程序跑着跑着内存越来越大，并且没有下降的趋势，重启一下程序也只能短暂恢复。通过 htop 命令再按一下 M 键按内存占用大小排个序，程序会占好几个G。那好，让我们来分析一下。
收集dump
通过 top 或 htop 进程管理器，或 ps 命令查找到目标进程 id，然后使用如下命令生成 dump：
createdump --full <PID>
dump 会自动保存在 /tmp 目录，文件名格式一般是 coredump.PID。
小试牛刀
拿到 dump 后，通过 windbg 打开。首先使用命令 !address -summary 查看一下。
注意：有的朋友可能打开 dump 文件后，发现 sos 扩展加载失败，需要手动加载一下，输入命令
.load sos即可。
0:000> !address -summary
Mapping file section regions...
Mapping module regions...
Mapping heap regions...
*** WARNING: Unable to verify timestamp for libc-2.17.so
--- Usage Summary ---------------- RgnCount ----------- Total Size -------- %ofBusy %ofTotal
<unknown> 869 ffffffff`f409b600 ( 16.000 EB) 100.00% 100.00%
Image 1117 0`0b565a00 ( 181.397 MB) 0.00% 0.00%
--- Type Summary (for busy) ------ RgnCount ----------- Total Size -------- %ofBusy %ofTotal
808 ffffffff`018de000 ( 16.000 EB) 100.00%
MEM_PRIVATE 1178 0`fdd23000 ( 3.966 GB) 0.00% 0.00%
--- State Summary ---------------- RgnCount ----------- Total Size -------- %ofBusy %ofTotal
808 ffffffff`018de000 ( 16.000 EB) 100.00% 100.00%
MEM_COMMIT 1178 0`fdd23000 ( 3.966 GB) 0.00% 0.00%
--- Protect Summary (for commit) - RgnCount ----------- Total Size -------- %ofBusy %ofTotal
PAGE_READWRITE 520 0`f6bf0000 ( 3.855 GB) 0.00% 0.00%
PAGE_EXECUTE_READ 160 0`05141000 ( 81.254 MB) 0.00% 0.00%
PAGE_READONLY 466 0`0147c000 ( 20.484 MB) 0.00% 0.00%
PAGE_EXECUTE_WRITECOPY 32 0`00b76000 ( 11.461 MB) 0.00% 0.00%
--- Largest Region by Usage ----------- Base Address -------- Region Size ----------
<unknown> 7ffd`7f5ad000 ffff8002`80053000 ( 16.000 EB)
Image 7f44`7390c000 0`013d2000 ( 19.820 MB)
从输出结果中 MEM_COMMIT 一栏可以看出，内存占了3.9G。
下一步要看是托管内存还是非托管内存吃掉。
托管内存
使用 eeheap 命令查看：
0:000> !sos eeheap
Loader Heap:
----------------------------------------
System Domain: 7f447979a8c0
LoaderAllocator: 7f447979a8c0
LowFrequencyHeap: 7f4406ce0000(10000:c000) 7f4406cc0000(10000:10000) 7f4406ca0000(10000:10000) 7f4406c80000(10000:10000) 7f4406c50000(10000:10000) 7f4406c20000(10000:10000) 7f4406c00000(10000:10000) 7f4406be0000(10000:10000) 7f4406bc0000(10000:10000) 7f4406b60000(10000:10000) 7f4406b30000(10000:10000) 7f4406b00000(10000:10000) 7f4406ad0000(10000:10000) 7f4406a90000(20000:20000) 7f4406a70000(10000:a000) 7f4406a20000(10000:f000) 7f4406a00000(10000:10000) 7f44069e0000(10000:10000) 7f44069d0000(10000:10000) 7f4406990000(40000:40000) 7f4406950000(30000:29000) 7f4406940000(10000:10000) 7f4406720000(10000:f000) 7f4406700000(10000:10000) 7f44066e0000(10000:10000) 7f44066d0000(10000:10000) 7f44066b0000(10000:10000) 7f4406690000(10000:10000) 7f4406670000(10000:10000) 7f4406540000(10000:10000) 7f4406530000(10000:10000) 7f4406390000(10000:b000) 7f4406330000(10000:10000) 7f4406300000(10000:10000) 7f44062e0000(10000:10000) 7f4406270000(10000:10000) 7f4406240000(10000:10000) 7f4406210000(10000:10000) 7f4406200000(10000:10000) 7f44061d0000(30000:2a000) 7f44061b0000(10000:4000) 7f4406190000(10000:10000) 7f4406170000(10000:10000) 7f4406160000(10000:f000) 7f4406140000(10000:c000) 7f4406110000(10000:10000) 7f44060e0000(10000:10000) 7f4405ed0000(10000:10000) 7f4405eb0000(10000:10000) 7f4405e90000(10000:10000) 7f4405e70000(10000:10000) 7f4405e50000(10000:f000) 7f4405d70000(10000:10000) 7f4405d50000(10000:10000) 7f4405d20000(10000:10000) 7f4405d00000(10000:10000) 7f4405ce0000(10000:10000) 7f4405cd0000(10000:10000) 7f4405cb0000(10000:f000) 7f4405c90000(10000:f000) 7f4405bd0000(10000:10000) 7f4405b40000(10000:10000) 7f4405b20000(10000:f000) 7f4405af0000(10000:10000) 7f4405ad0000(10000:10000) 7f4405aa0000(30000:2f000) 7f4405a90000(10000:e000) 7f4405a70000(10000:10000) 7f4405a30000(10000:10000) 7f4405a10000(10000:10000) 7f44059a0000(10000:10000) 7f4405980000(10000:10000) 7f4405970000(10000:10000) 7f4405950000(10000:10000) 7f4405730000(10000:10000) 7f4405720000(10000:10000) 7f4405700000(10000:10000) 7f44056e0000(10000:10000) 7f44056b0000(10000:10000) 7f44056a0000(10000:10000) 7f4405670000(10000:10000) 7f4405650000(10000:10000) 7f4405630000(10000:f000) 7f44055e0000(10000:10000) 7f44055d0000(10000:10000) 7f44055c0000(10000:10000) 7f44055a0000(10000:10000) 7f4405590000(10000:10000) 7f4405580000(10000:10000) 7f4405560000(10000:10000) 7f4405540000(10000:10000) 7f4405520000(10000:10000) 7f4405510000(10000:10000) 7f44054f0000(10000:10000) 7f44054e0000(10000:10000) 7f44054c0000(10000:10000) 7f44054a0000(10000:10000) 7f4405490000(10000:10000) 7f4405280000(10000:d000) 7f4405260000(10000:10000) 7f4405240000(10000:10000) 7f4405230000(10000:10000) 7f4405210000(10000:10000) 7f4405200000(10000:10000) 7f44051f0000(10000:10000) 7f44051a0000(10000:10000) 7f4405180000(10000:10000) 7f4405150000(10000:10000) 7f4405120000(10000:10000) 7f44050e0000(10000:10000) 7f4405050000(10000:10000) 7f4405020000(10000:10000) 7f4404ff0000(10000:10000) 7f4404fc0000(10000:10000) 7f4404fb0000(10000:10000) 7f4404f90000(10000:f000) 7f4404f50000(10000:10000) 7f4404f40000(10000:10000) 7f4404f30000(10000:10000) 7f4404f10000(10000:7000) 7f4404e60000(10000:10000) 7f4404e50000(10000:e000) 7f4404e30000(10000:d000) 7f4404d20000(10000:10000) 7f4404d10000(10000:10000) 7f4404cf0000(10000:7000) 7f4404c70000(10000:10000) 7f4404c50000(10000:10000) 7f4404a40000(10000:b000) 7f4404a20000(10000:e000) 7f4404a00000(10000:10000) 7f4404970000(10000:10000) 7f4404950000(10000:10000) 7f4404940000(10000:10000) 7f4404930000(10000:7000) 7f4404920000(10000:f000) 7f4404900000(10000:10000) 7f44048e0000(10000:10000) 7f4404830000(10000:10000) 7f4404810000(10000:10000) 7f44047f0000(10000:c000) 7f4404710000(10000:10000) 7f44046f0000(10000:10000) 7f44046d0000(10000:10000) 7f44046a0000(10000:10000) 7f4404550000(10000:10000) 7f44044a0000(10000:10000) 7f44043d0000(10000:10000) 7f44043c0000(10000:10000) 7f44040c0000(10000:b000) 7f4404000000(10000:e000) 7f4403ed0000(10000:10000) 7f4403e30000(10000:10000) 7f4403d10000(10000:10000) 7f4403d00000(10000:f000) 7f4403c90000(10000:a000) 7f4403bc0000(10000:10000) 7f4403bb0000(10000:f000) 7f44037a0000(10000:a000) 7f4403770000(10000:10000) 7f4403730000(10000:10000) 7f44036d0000(10000:10000) 7f4403660000(10000:10000) 7f4403510000(10000:10000) 7f44033f0000(10000:c000) 7f44032a0000(10000:10000) 7f4403280000(10000:10000) 7f4403270000(10000:f000) 7f4403220000(40000:3f000) 7f4402980000(20000:1a000) 7f4402650000(10000:d000) 7f4402620000(10000:d000) 7f4402580000(10000:10000) 7f4402360000(10000:f000) 7f4402210000(10000:10000) 7f4402140000(10000:10000) 7f4402050000(10000:10000) 7f4402030000(10000:10000) 7f4401ee0000(10000:10000) 7f4401d70000(10000:10000) 7f4401cb0000(10000:10000) 7f4401ad0000(10000:10000) 7f44018b0000(10000:f000) 7f44016d0000(10000:10000) 7f4401520000(10000:10000) 7f44013b0000(10000:10000) 7f4401210000(20000:1f000) 7f4400f90000(10000:3000) 7f4400de0000(10000:10000) 7f4400d20000(10000:10000) 7f4400b00000(10000:f000) 7f4400a20000(10000:10000) 7f4400870000(10000:10000) 7f4400730000(20000:20000) 7f44004d0000(10000:2000) 7f4400280000(10000:10000) 7f4400200000(10000:e000) 7f44001f0000(10000:9000) 7f4400100000(10000:10000) 7f44000f0000(10000:10000) 7f44000a0000(10000:10000) 7f4400000000(10000:10000) 7f43fffb0000(50000:50000) 7f43ff4e0000(3000:1000) Size: 0xd3b000 (13873152) bytes total, 0xb4000 (737280) bytes wasted.
HighFrequencyHeap: 7f4406cd0000(10000:f000) 7f4406cb0000(10000:10000) 7f4406c70000(10000:10000) 7f4406c60000(10000:10000) 7f4406c40000(10000:10000) 7f4406c30000(10000:10000) 7f4406c10000(10000:10000) 7f4406bf0000(10000:10000) 7f4406bd0000(10000:10000) 7f4406b70000(10000:10000) 7f4406b50000(10000:10000) 7f4406b40000(10000:10000) 7f4406b10000(10000:10000) 7f4406af0000(10000:10000) 7f4406ae0000(10000:10000) 7f4406ac0000(10000:10000) 7f4406ab0000(10000:10000) 7f4406a80000(10000:10000) 7f4406a60000(10000:10000) 7f4406a50000(10000:10000) 7f4406a40000(10000:10000) 7f4406a30000(10000:10000) 7f4406a10000(10000:10000) 7f44069f0000(10000:10000) 7f4406980000(10000:10000) 7f4406730000(10000:10000) 7f4406710000(10000:10000) 7f44066f0000(10000:10000) 7f44066c0000(10000:10000) 7f44066a0000(10000:10000) 7f4406680000(10000:10000) 7f4406620000(10000:10000) 7f4406550000(10000:10000) 7f44063a0000(10000:10000) 7f4406380000(10000:f000) 7f4406320000(10000:10000) 7f4406310000(10000:10000) 7f44062f0000(10000:f000) 7f44062d0000(10000:10000) 7f4406280000(10000:10000) 7f4406230000(10000:f000) 7f44061c0000(10000:10000) 7f44061a0000(10000:10000) 7f4406180000(10000:10000) 7f4406150000(10000:10000) 7f4406130000(10000:10000) 7f4406100000(10000:10000) 7f44060f0000(10000:10000) 7f4405ec0000(10000:10000) 7f4405ea0000(10000:10000) 7f4405e80000(10000:10000) 7f4405e60000(10000:10000) 7f4405e30000(10000:10000) 7f4405d60000(10000:10000) 7f4405d40000(10000:10000) 7f4405d10000(10000:10000) 7f4405cf0000(10000:10000) 7f4405cc0000(10000:10000) 7f4405ca0000(10000:10000) 7f4405c80000(10000:10000) 7f4405b50000(10000:10000) 7f4405b30000(10000:10000) 7f4405b10000(10000:10000) 7f4405b00000(10000:10000) 7f4405ae0000(10000:10000) 7f4405a80000(10000:f000) 7f4405a60000(10000:10000) 7f4405a20000(10000:10000) 7f4405990000(10000:10000) 7f4405960000(10000:10000) 7f4405740000(10000:10000) 7f4405710000(10000:10000) 7f44056f0000(10000:10000) 7f44056d0000(10000:10000) 7f44056c0000(10000:10000) 7f4405680000(10000:10000) 7f4405660000(10000:10000) 7f4405640000(10000:10000) 7f4405610000(10000:10000) 7f4405600000(10000:10000) 7f44055f0000(10000:10000) 7f44055b0000(10000:10000) 7f4405570000(10000:10000) 7f4405530000(10000:10000) 7f4405500000(10000:10000) 7f44054d0000(10000:10000) 7f44054b0000(10000:10000) 7f4405270000(10000:10000) 7f4405250000(10000:10000) 7f4405220000(10000:10000) 7f44051e0000(10000:10000) 7f4405190000(10000:10000) 7f4405170000(10000:10000) 7f4405160000(10000:10000) 7f4405140000(10000:10000) 7f4405130000(10000:10000) 7f4405110000(10000:10000) 7f4405100000(10000:10000) 7f44050f0000(10000:10000) 7f4405060000(10000:10000) 7f4405040000(10000:10000) 7f4405030000(10000:10000) 7f4405010000(10000:10000) 7f4405000000(10000:10000) 7f4404fe0000(10000:10000) 7f4404fd0000(10000:10000) 7f4404fa0000(10000:10000) 7f4404f80000(10000:10000) 7f4404f60000(10000:10000) 7f4404f20000(10000:10000) 7f4404f00000(10000:10000) 7f4404e40000(10000:10000) 7f4404d00000(10000:10000) 7f4404cd0000(10000:10000) 7f4404c60000(10000:10000) 7f4404a30000(10000:10000) 7f4404a10000(10000:10000) 7f4404980000(10000:10000) 7f4404960000(10000:10000) 7f4404910000(10000:10000) 7f44048f0000(10000:10000) 7f44048d0000(10000:10000) 7f44048c0000(10000:10000) 7f4404820000(10000:10000) 7f4404800000(10000:10000) 7f44047e0000(10000:10000) 7f4404700000(10000:10000) 7f44046e0000(10000:10000) 7f44046c0000(10000:10000) 7f44046b0000(10000:10000) 7f4404690000(10000:10000) 7f44045b0000(10000:10000) 7f4404540000(10000:10000) 7f44044b0000(10000:10000) 7f4404490000(10000:10000) 7f4404480000(10000:10000) 7f44043e0000(10000:10000) 7f4404020000(10000:10000) 7f4404010000(10000:10000) 7f4403fa0000(10000:10000) 7f4403ee0000(10000:10000) 7f4403e40000(10000:10000) 7f4403d30000(10000:10000) 7f4403d20000(10000:10000) 7f4403ca0000(10000:10000) 7f4403c70000(10000:10000) 7f4403c60000(10000:10000) 7f4403bd0000(10000:10000) 7f44037b0000(10000:10000) 7f4403790000(10000:10000) 7f4403780000(10000:10000) 7f4403760000(10000:10000) 7f4403750000(10000:10000) 7f4403740000(10000:10000) 7f4403720000(10000:10000) 7f4403710000(10000:10000) 7f44036e0000(10000:10000) 7f44036c0000(10000:10000) 7f44036b0000(10000:10000) 7f4403420000(10000:10000) 7f4403410000(10000:10000) 7f4403400000(10000:10000) 7f44033a0000(10000:10000) 7f4403330000(10000:10000) 7f4403290000(10000:10000) 7f4403260000(10000:10000) 7f4402660000(10000:10000) 7f4402640000(10000:10000) 7f4402630000(10000:10000) 7f4402590000(10000:10000) 7f4402480000(10000:10000) 7f4402370000(10000:10000) 7f44022e0000(10000:10000) 7f4402230000(10000:10000) 7f4402220000(10000:10000) 7f4402130000(10000:10000) 7f4402120000(10000:10000) 7f4402070000(10000:10000) 7f4402060000(10000:10000) 7f4402040000(10000:10000) 7f4402020000(10000:10000) 7f4401df0000(10000:10000) 7f4401d80000(10000:10000) 7f4401d60000(10000:10000) 7f4401d00000(10000:10000) 7f44019c0000(10000:10000) 7f4401850000(10000:10000) 7f44016e0000(10000:10000) 7f4401600000(10000:10000) 7f4401510000(10000:10000) 7f44012e0000(10000:10000) 7f4400f20000(10000:10000) 7f4400d40000(10000:10000) 7f4400d30000(10000:10000) 7f4400b70000(10000:10000) 7f4400a30000(10000:10000) 7f44009c0000(10000:10000) 7f44004e0000(10000:10000) 7f4400110000(10000:10000) 7f44000e0000(10000:10000) 7f44000d0000(10000:10000) 7f44000c0000(10000:10000) 7f44000b0000(10000:10000) 7f4400010000(10000:10000) 7f43ff4e4000(9000:5000) Size: 0xcc0000 (13369344) bytes total, 0x8000 (32768) bytes wasted.
StubHeap: 7f4405070000(10000:5000) 7f43ff4ed000(3000:3000) Size: 0x8000 (32768) bytes total.
IndirectionCellHeap: 7f4405690000(10000:5000) 7f43ff4f0000(6000:6000) Size: 0xb000 (45056) bytes total.
LookupHeap: 7f4404f70000(10000:6000) 7f43ff4ff000(4000:4000) Size: 0xa000 (40960) bytes total.
ResolveHeap: 7f43ff534000(57000:20000) Size: 0x20000 (131072) bytes total.
DispatchHeap: 7f43ff503000(31000:e000) Size: 0xe000 (57344) bytes total.
CacheEntryHeap: 7f4406220000(10000:3000) 7f43ff4f6000(9000:9000) Size: 0xc000 (49152) bytes total.
Total size: Size: 0x1a52000 (27598848) bytes total, 0xbc000 (770048) bytes wasted.
----------------------------------------
Domain 1: 5558fbe901d0
LoaderAllocator: 5558fbe901d0
No unique loader heaps found.
----------------------------------------
JIT Manager: 5558fbe936c0
LoaderCodeHeap: 7f4400020000(80000:36000) Size: 0x36000 (221184) bytes total.
LoaderCodeHeap: 7f4401940000(80000:39000) Size: 0x39000 (233472) bytes total.
LoaderCodeHeap: 7f44032b0000(80000:42000) Size: 0x42000 (270336) bytes total.
LoaderCodeHeap: 7f4403be0000(80000:49000) Size: 0x49000 (299008) bytes total.
LoaderCodeHeap: 7f44044c0000(80000:5a000) Size: 0x5a000 (368640) bytes total.
LoaderCodeHeap: 7f4404840000(80000:5f000) Size: 0x5f000 (389120) bytes total.
LoaderCodeHeap: 7f4404a50000(200000:18f000) Size: 0x18f000 (1634304) bytes total.
LoaderCodeHeap: 7f4405290000(200000:1c4000) Size: 0x1c4000 (1851392) bytes total.
LoaderCodeHeap: 7f4405750000(200000:1b1000) Size: 0x1b1000 (1773568) bytes total.
LoaderCodeHeap: 7f4405ee0000(200000:1b6000) Size: 0x1b6000 (1794048) bytes total.
LoaderCodeHeap: 7f4406740000(200000:15f000) Size: 0x15f000 (1437696) bytes total.
HostCodeHeap: 7f4403c80000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4404ce0000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4405a50000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4405d80000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4406120000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4406260000(10000:10000) Size: 0x10000 (65536) bytes total.
HostCodeHeap: 7f4406290000(40000:40000) Size: 0x40000 (262144) bytes total.
HostCodeHeap: 7f4406340000(40000:40000) Size: 0x40000 (262144) bytes total.
HostCodeHeap: 7f4406b80000(40000:40000) Size: 0x40000 (262144) bytes total.
Total size: Size: 0xaec000 (11452416) bytes total.
----------------------------------------
========================================
Number of GC Heaps: 1
----------------------------------------
generation 0 starts at 7f423d1f52c8
generation 1 starts at 7f423cc8b198
generation 2 starts at 7f43c7fff000
ephemeral segment allocation context: none
Small object heap
segment begin allocated committed allocated size committed size
7f419d080000 7f419d081000 7f41acef9e78 7f41acf1a000 0xfe78e78 (266833528) 0xfe9a000 (266969088)
7f41bbfe0000 7f41bbfe1000 7f41cbb9b950 7f41cbbbc000 0xfbba950 (263956816) 0xfbdc000 (264093696)
7f4203ff0000 7f4203ff1000 7f4213feffb0 7f4213ff0000 0xfffefb0 (268431280) 0x10000000 (268435456)
7f422bffa000 7f422bffb000 7f423a3a02f0 7f423a3c1000 0xe3a52f0 (238703344) 0xe3c7000 (238841856)
7f428bff0000 7f428bff1000 7f429bfeffe0 7f429bff0000 0xfffefe0 (268431328) 0x10000000 (268435456)
7f429bff2000 7f429bff3000 7f42abff2000 7f42abff2000 0xffff000 (268431360) 0x10000000 (268435456)
7f42abffe000 7f42abfff000 7f42bbffdfd0 7f42bbffe000 0xfffefd0 (268431312) 0x10000000 (268435456)
7f42d3ffe000 7f42d3fff000 7f42e3ffe000 7f42e3ffe000 0xffff000 (268431360) 0x10000000 (268435456)
7f42fb030000 7f42fb031000 7f430b030000 7f430b030000 0xffff000 (268431360) 0x10000000 (268435456)
7f4317ffe000 7f4317fff000 7f4327ffe000 7f4327ffe000 0xffff000 (268431360) 0x10000000 (268435456)
7f43c7ffe000 7f43c7fff000 7f43d7ffdfe8 7f43d7ffe000 0xfffefe8 (268431336) 0x10000000 (268435456)
7f423bffe000 7f423bfff000 7f423d33f780 7f423e51b000 0x1340780 (20187008) 0x251d000 (38916096)
Large object heap starts at 7f43d7fff000
segment begin allocated committed allocated size committed size
7f40ed054000 7f40ed055000 7f40f1055038 7f40f1056000 0x4000038 (67108920) 0x4002000 (67117056)
7f41d3fe4000 7f41d3fe5000 7f41d7fe5038 7f41d8006000 0x4000038 (67108920) 0x4022000 (67248128)
7f41dbfe6000 7f41dbfe7000 7f41dffe7038 7f41e0008000 0x4000038 (67108920) 0x4022000 (67248128)
7f41ebfea000 7f41ebfeb000 7f41effeb038 7f41f000c000 0x4000038 (67108920) 0x4022000 (67248128)
7f41f3fec000 7f41f3fed000 7f41f7fed038 7f41f800e000 0x4000038 (67108920) 0x4022000 (67248128)
7f41fbfee000 7f41fbfef000 7f41fffef038 7f4200010000 0x4000038 (67108920) 0x4022000 (67248128)
7f432fffe000 7f432ffff000 7f4337063918 7f4337084000 0x7064918 (117852440) 0x7086000 (117989376)
7f43d7ffe000 7f43d7fff000 7f43de5eb030 7f43de5ec000 0x65ec030 (106872880) 0x65ee000 (106881024)
Pinned object heap starts at 7f43dffff000
segment begin allocated committed allocated size committed size
7f43dfffe000 7f43dffff000 7f43e02bc4f8 7f43e02c0000 0x2bd4f8 (2872568) 0x2c2000 (2891776)
------------------------------
GC Allocated Heap Size: Size: 0xd4a1f110 (3567382800) bytes.
GC Committed Heap Size: Size: 0xd5d3c000 (3587424256) bytes.
Total bytes consumed by CLR: 0xd827a000 (3626475520)
可以看到，CLR 吃掉了3.6G。Ok，到这儿基本可以确定是托管内存问题。
相信大家都注意到小对象堆和大对象堆有大量的内存段，吃掉了主要的托管内存。
接下来使用 dumpheap -stat 来统计下托管堆上内存所有对象：
0:000> !sos dumpheap -stat
Statistics:
MT Count TotalSize Class Name
7f4406bf5ef0 1 24 NPOI.OpenXmlFormats.ExtendedPropertiesDocument
7f4406bf60a0 1 24 NPOI.OpenXmlFormats.CustomPropertiesDocument
7f4406bf67e8 1 24 NPOI.OpenXmlFormats.CT_CustomProperties
7f4406bf74e0 1 24 NPOI.OpenXmlFormats.CT_Property[]
7f4406bf8540 1 24 NPOI.HSSF.Util.HSSFColor+Black
7f4406bf8678 1 24 NPOI.HSSF.Util.HSSFColor+White
...
...
7f440213aa08 3,270 313,920 System.Reflection.Emit.DynamicMethod
7f44000c8080 4,135 358,828 System.Int32[]
7f4401519498 10,309 365,192 System.RuntimeType[]
7f440480b990 2 458,800 StackExchange.Redis.RawResult[]
7f440213faa0 3,270 470,880 System.Reflection.Emit.DynamicILGenerator
7f440185dcf8 5,133 492,768 System.Reflection.RuntimeParameterInfo
7f44000e7e60 3,216 551,160 System.String[]
7f440185e0a8 6,986 558,880 System.Signature
7f44012e8f10 10,812 1,124,448 System.Reflection.RuntimeMethodInfo
7f44000c7bc8 15,112 1,305,648 System.SByte[]
7f44000cd2e0 30,854 2,294,568 System.String
7f4400110eb0 224 5,064,502 System.Char[]
7f4400b784f0 18,748 21,734,523 System.Byte[]
7f44046efe70 6,541,452 418,652,928 System.EventHandler<StackExchange.Redis.EndPointEventArgs>
7f44047001b0 6,541,452 418,652,928 System.EventHandler<StackExchange.Redis.HashSlotMovedEventArgs>
7f4404700488 6,541,452 418,652,928 System.EventHandler<StackExchange.Redis.InternalErrorEventArgs>
7f44046efc10 6,541,452 418,652,928 System.EventHandler<StackExchange.Redis.RedisErrorEventArgs>
5558fbe656a0 293,562 474,504,032 Free
7f440001b0f8 5,222 538,033,592 System.Object[]
7f44046ef988 13,082,904 837,305,856 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
Total 39,789,084 objects, 3,567,106,882 bytes
这个命令会按照 mt 汇总统计每个对象的数量及所占内存大小，并按内存大小排序，我们看到询问有几个对象格外抢眼，其中最后一个有 1000w 个 EvevtHandler 对象，占 837 M，那就继续往下看。
罪魁祸首
我们需要看一下这 1000w 对象到底什么来头，因为上述是按 mt 汇总的，所以现在用 dumpheap -mt 展开看一下：
0:000> !sos dumpheap -mt 7f44046ef988
Address MT Size
7f419d0810c0 7f44046ef988 64
7f419d081100 7f44046ef988 64
7f419d081240 7f44046ef988 64
...
7f419d2f0e50 7f44046ef988 64
7f419d2f0f90 7f44046ef988 64
7f419d2f0fd0 7f44046ef988 64
Statistics:
MT Count TotalSize Class Name
7f44046ef988 13,160 842,240 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
Total 13,160 objects, 842,240 bytes
对象太多，不可能展示完，所以这里做了一个省略。好的，接下来抽查几个对象使用命令 dumpobj 看一下：
0:000> !sos dumpobj /d 7f419d2f0fd0
Name: System.EventHandler`1[[StackExchange.Redis.ConnectionFailedEventArgs, StackExchange.Redis]]
MethodTable: 00007f44046ef988
EEClass: 00007f44046f8b58
Tracked Type: false
Size: 64(0x40) bytes
File: /usr/share/dotnet/shared/Microsoft.NETCore.App/6.0.6/System.Private.CoreLib.dll
Fields:
MT Field Offset Type VT Attr Value Name
00007f4400015290 40001bd 8 System.Object 0 instance 00007f419d2f0fd0 _target
00007f4400015290 40001be 10 System.Object 0 instance 0000000000000000 _methodBase
00007f44000c3eb8 40001bf 18 System.IntPtr 1 instance 00007F43FF4ED1E0 _methodPtr
00007f44000c3eb8 40001c0 20 System.IntPtr 1 instance 00007F4403BEF508 _methodPtrAux
00007f4400015290 4000243 28 System.Object 0 instance 0000000000000000 _invocationList
00007f44000c3eb8 4000244 30 System.IntPtr 1 instance 0000000000000000 _invocationCount
抽查几个后发现，都是一样。那既然这些对象一直不被GC回收，肯定有什么原因，使用 gcroot 查看一下都被谁引用：
0:000> !sos gcroot 7f419d2f0fd0
Caching GC roots, this may take a while.
Subsequent runs of this command will be faster.
HandleTable:
00007f447a911310 (strong handle)
-> 7f43e0008c28 System.Object[]
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer (static variable: System.Object._locker)
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
Thread 1f4f:
7f44724de9b0 7f440488ac93 StackExchange.Redis.PhysicalBridge+<ProcessBacklogAsync>d__97.MoveNext()
rbp-78: 00007f44724de9c8
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
rbp-80: 00007f44724de9c0
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
7f44724dea50 7f44048888f9
rbp-8: 00007f44724dea78
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
7f44724dea90 7f44048882fb
rbp-10: 00007f44724dea90
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
7f44724deab0 7f44048882ac StackExchange.Redis.PhysicalBridge.ProcessBacklogAsync()
rbp-30: 00007f44724deab0
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
rbp-8: 00007f44724dead8
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
7f44724deaf0 7f4404887f3f StackExchange.Redis.PhysicalBridge+<>c.<StartBacklogProcessor>b__93_0(System.Object)
rbp-10: 00007f44724deaf0
-> 7f43c81b7e30 StackExchange.Redis.PhysicalBridge
-> 7f43c81a4aa0 StackExchange.Redis.ConnectionMultiplexer
-> 7f423d33c828 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
-> 7f41f3fed020 System.Object[]
-> 7f419d2f0fd0 System.EventHandler<StackExchange.Redis.ConnectionFailedEventArgs>
Found 8 unique roots.
注意：因为对象太多，遍历查找引用链需要一点儿时间，请耐心等待！
我们发现，它们都被 StackExchange.Redis.ConnectionMultiplexer 引用，这是一个 redis 连接对象。再经过大胆猜测和简单分析，其余几个巨量对象列表都是这个 redis 对象的事件。说明程序中引入了 StackExchange 的 redis 扩展包，并在项目中某处使用了 redis 操作，这个对象到底在何处，可能出问题的代码又在哪儿？
定位代码
有经验的朋友可能会知道，redis 这个对象大概率是一个静态变量。现在我们来验证一下，试图查找这个对象对应的静态变量所在位置，使用 s-q 命令查找是哪个内存地址（B）上保存此这个 redis 对象地址（A）。
首先缩小内存查找范围：
0:000> !sos dumpobj /d 7f43e0008c28
Name: System.Object[]
MethodTable: 00007f440001b0f8
EEClass: 00007f440001b070
Tracked Type: false
Size: 32664(0x7f98) bytes
Array: Rank 1, Number of elements 4080, Type CLASS (Print Array)
Fields:
None
我们需要用到这个 Object 对象数组的起始位置及数量用作如下命令的偏移：
0:000> s-q 7f43e0008c28 L?0x7f98 7f43c81a4aa0
00007f43`e000aaa0 00007f43`c81a4aa0 00007f43`ca4922a0
这样，我们就找到了静态变量的位置（B）：
00007f43`e000aaa0
让我们继续查找是哪些代码在使用这个静态变量：
0:000> s-b 0 L?0xffffffffffffffff a0 aa 00 e0 43 7f 00 00
00007f44`044f9f81 a0 aa 00 e0 43 7f 00 00-33 ff 48 89 38 48 b8 6c ....C...3.H.8H.l
00007f44`044fb96a a0 aa 00 e0 43 7f 00 00-48 83 3e 00 40 0f 94 c6 ....C...H.>.@...
00007f44`044fb9b3 a0 aa 00 e0 43 7f 00 00-48 83 3f 00 74 38 48 bf ....C...H.?.t8H.
00007f44`044fb9c3 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 b8 28 b0 6e ....C...H.?H.(.n
00007f44`044fba71 a0 aa 00 e0 43 7f 00 00-48 8b b5 50 ff ff ff e8 ....C...H..P....
00007f44`044fbaa9 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 7d b8 48 ....C...H.?H.}.H
00007f44`044fbb03 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 7d a8 48 ....C...H.?H.}.H
00007f44`044fbb5d a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 7d 98 48 ....C...H.?H.}.H
00007f44`044fbbb7 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 7d 88 48 ....C...H.?H.}.H
00007f44`044fbc11 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 bd 78 ff ....C...H.?H..x.
00007f44`044fbc74 a0 aa 00 e0 43 7f 00 00-48 8b 3f 48 89 bd 68 ff ....C...H.?H..h.
00007f44`044fbcc7 a0 aa 00 e0 43 7f 00 00-48 8b 00 48 89 45 d0 90 ....C...H..H.E..
OK 我们找到不少，抽几个看一下反汇编代码：
0:000> !sos u 00007f44`044fb96a
Normal JIT generated code
Wisder.xRiver.BaseCore.Util.xRedis.get_Instance()
ilAddr is 00007F447142F990 pImport is 00000143049FEE00
Begin 00007F44044FB890, size 485
00007f44`044fb890 55 push rbp
00007f44`044fb891 4881ecd0000000 sub rsp,0D0h
00007f44`044fb898 488dac24d0000000 lea rbp,[rsp+0D0h]
00007f44`044fb8a0 33c0 xor eax,eax
00007f44`044fb8a2 48898538ffffff mov qword ptr [rbp-0C8h],rax
00007f44`044fb8a9 c4413857c0 vxorps xmm8,xmm8,xmm8
00007f44`044fb8ae 48b840ffffffffffffff mov rax,0FFFFFFFFFFFFFF40h
00007f44`044fb8b8 c5797f0428 vmovdqa xmmword ptr [rax+rbp],xmm8
00007f44`044fb8bd c5797f440510 vmovdqa xmmword ptr [rbp+rax+10h],xmm8
00007f44`044fb8c3 c5797f440520 vmovdqa xmmword ptr [rbp+rax+20h],xmm8
00007f44`044fb8c9 4883c030 add rax,30h
00007f44`044fb8cd 75e9 jne 00007f44`044fb8b8
00007f44`044fb8cf 4889a530ffffff mov qword ptr [rbp-0D0h],rsp
00007f44`044fb8d6 48b870e26402447f0000 mov rax,7F440264E270h
00007f44`044fb8e0 833800 cmp dword ptr [rax],0
00007f44`044fb8e3 7405 je 00007f44`044fb8ea
00007f44`044fb8e5 e88659dd74 call libcoreclr!JIT_DbgIsJustMyCode (00007f44`792d1270)
00007f44`044fb8ea 90 nop
00007f44`044fb8eb 48bf90aa00e0437f0000 mov rdi,7F43E000AA90h
00007f44`044fb8f5 488b3f mov rdi,qword ptr [rdi]
00007f44`044fb8f8 393f cmp dword ptr [rdi],edi
00007f44`044fb8fa e829ccb2fb call 00007f44`00028528 (System.String.get_Length(), mdToken: 0000000006000764)
00007f44`044fb8ff 8945cc mov dword ptr [rbp-34h],eax
00007f44`044fb902 837dcc00 cmp dword ptr [rbp-34h],0
00007f44`044fb906 400f94c6 sete sil
00007f44`044fb90a 400fb6f6 movzx esi,sil
00007f44`044fb90e 8975fc mov dword ptr [rbp-4],esi
00007f44`044fb911 837dfc00 cmp dword ptr [rbp-4],0
00007f44`044fb915 7451 je 00007f44`044fb968
00007f44`044fb917 90 nop
00007f44`044fb918 48bf90ec0c00447f0000 mov rdi,7F44000CEC90h (MT: System.Exception)
00007f44`044fb922 e809c8dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fb927 48898540ffffff mov qword ptr [rbp-0C0h],rax
00007f44`044fb92e bf49220000 mov edi,2249h
00007f44`044fb933 48be00de6402447f0000 mov rsi,7F440264DE00h
00007f44`044fb93d e87ecedc74 call libcoreclr!JIT_StrCns (00007f44`792c87c0)
00007f44`044fb942 48898538ffffff mov qword ptr [rbp-0C8h],rax
00007f44`044fb949 488bb538ffffff mov rsi,qword ptr [rbp-0C8h]
00007f44`044fb950 488bbd40ffffff mov rdi,qword ptr [rbp-0C0h]
00007f44`044fb957 e89cd1b2fb call 00007f44`00028af8 (System.Exception..ctor(System.String), mdToken: 00000000060003CB)
00007f44`044fb95c 488bbd40ffffff mov rdi,qword ptr [rbp-0C0h]
00007f44`044fb963 e8f832dd74 call libcoreclr!IL_Throw (00007f44`792cec60)
00007f44`044fb968 48bea0aa00e0437f0000 mov rsi,7F43E000AAA0h
00007f44`044fb972 48833e00 cmp qword ptr [rsi],0
00007f44`044fb976 400f94c6 sete sil
00007f44`044fb97a 400fb6f6 movzx esi,sil
00007f44`044fb97e 8975f8 mov dword ptr [rbp-8],esi
00007f44`044fb981 837df800 cmp dword ptr [rbp-8],0
00007f44`044fb985 0f8409010000 je 00007f44`044fba94
00007f44`044fb98b 90 nop
00007f44`044fb98c 48be98aa00e0437f0000 mov rsi,7F43E000AA98h
00007f44`044fb996 488b36 mov rsi,qword ptr [rsi]
00007f44`044fb999 488975f0 mov qword ptr [rbp-10h],rsi
00007f44`044fb99d 33f6 xor esi,esi
00007f44`044fb99f 8975e8 mov dword ptr [rbp-18h],esi
00007f44`044fb9a2 488d75e8 lea rsi,[rbp-18h]
00007f44`044fb9a6 488b7df0 mov rdi,qword ptr [rbp-10h]
00007f44`044fb9aa e811dbb2fb call 00007f44`000294c0 (System.Threading.Monitor.Enter(System.Object, Boolean ByRef), mdToken: 0000000006002BA0)
00007f44`044fb9af 90 nop
00007f44`044fb9b0 90 nop
00007f44`044fb9b1 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fb9bb 48833f00 cmp qword ptr [rdi],0
00007f44`044fb9bf 7438 je 00007f44`044fb9f9
00007f44`044fb9c1 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fb9cb 488b3f mov rdi,qword ptr [rdi]
00007f44`044fb9ce 48b828b06e04447f0000 mov rax,7F44046EB028h
00007f44`044fb9d8 393f cmp dword ptr [rdi],edi
00007f44`044fb9da ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.get_IsConnected(), mdToken: 00000000060001A2)
00007f44`044fb9dc 89854cffffff mov dword ptr [rbp-0B4h],eax
00007f44`044fb9e2 83bd4cffffff00 cmp dword ptr [rbp-0B4h],0
00007f44`044fb9e9 400f94c7 sete dil
00007f44`044fb9ed 400fb6ff movzx edi,dil
00007f44`044fb9f1 89bd64ffffff mov dword ptr [rbp-9Ch],edi
00007f44`044fb9f7 eb0a jmp 00007f44`044fba03
00007f44`044fb9f9 c78564ffffff01000000 mov dword ptr [rbp-9Ch],1
00007f44`044fba03 8bbd64ffffff mov edi,dword ptr [rbp-9Ch]
00007f44`044fba09 400fb6ff movzx edi,dil
00007f44`044fba0d 897de4 mov dword ptr [rbp-1Ch],edi
00007f44`044fba10 837de400 cmp dword ptr [rbp-1Ch],0
00007f44`044fba14 7470 je 00007f44`044fba86
00007f44`044fba16 90 nop
00007f44`044fba17 48bf90aa00e0437f0000 mov rdi,7F43E000AA90h
00007f44`044fba21 488b3f mov rdi,qword ptr [rdi]
00007f44`044fba24 e86ff6ffff call 00007f44`044fb098 (StackExchange.Redis.ConfigurationOptions.Parse(System.String), mdToken: 0000000006000156)
00007f44`044fba29 48898558ffffff mov qword ptr [rbp-0A8h],rax
00007f44`044fba30 488bbd58ffffff mov rdi,qword ptr [rbp-0A8h]
00007f44`044fba37 48897dd8 mov qword ptr [rbp-28h],rdi
00007f44`044fba3b 488b7dd8 mov rdi,qword ptr [rbp-28h]
00007f44`044fba3f be10270000 mov esi,2710h
00007f44`044fba44 393f cmp dword ptr [rdi],edi
00007f44`044fba46 e8edf7ffff call 00007f44`044fb238 (StackExchange.Redis.ConfigurationOptions.set_ConnectTimeout(Int32), mdToken: 0000000006000121)
00007f44`044fba4b 90 nop
00007f44`044fba4c 488b7dd8 mov rdi,qword ptr [rbp-28h]
00007f44`044fba50 be983a0000 mov esi,3A98h
00007f44`044fba55 393f cmp dword ptr [rdi],edi
00007f44`044fba57 e82cf9ffff call 00007f44`044fb388 (StackExchange.Redis.ConfigurationOptions.set_SyncTimeout(Int32), mdToken: 000000000600014B)
00007f44`044fba5c 90 nop
00007f44`044fba5d 488b7dd8 mov rdi,qword ptr [rbp-28h]
00007f44`044fba61 33f6 xor esi,esi
00007f44`044fba63 e838e3ffff call 00007f44`044f9da0 (StackExchange.Redis.ConnectionMultiplexer.Connect(StackExchange.Redis.ConfigurationOptions, System.IO.TextWriter), mdToken: 00000000060001BC)
00007f44`044fba68 48898550ffffff mov qword ptr [rbp-0B0h],rax
00007f44`044fba6f 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fba79 488bb550ffffff mov rsi,qword ptr [rbp-0B0h]
00007f44`044fba80 e80cb7f274 call libcoreclr!JIT_CheckedWriteBarrier (00007f44`79427191)
00007f44`044fba85 90 nop
00007f44`044fba86 90 nop
00007f44`044fba87 90 nop
00007f44`044fba88 eb00 jmp 00007f44`044fba8a
00007f44`044fba8a 488bfc mov rdi,rsp
00007f44`044fba8d e854020000 call 00007f44`044fbce6 (Wisder.xRiver.BaseCore.Util.xRedis.get_Instance(), mdToken: 00000000060000B3)
00007f44`044fba92 90 nop
00007f44`044fba93 90 nop
00007f44`044fba94 48bf88f96e04447f0000 mov rdi,7F44046EF988h (MT: System.EventHandler`1[[StackExchange.Redis.ConnectionFailedEventArgs, StackExchange.Redis]])
00007f44`044fba9e e88dc6dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbaa3 488945c0 mov qword ptr [rbp-40h],rax
00007f44`044fbaa7 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbab1 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbab4 48897db8 mov qword ptr [rbp-48h],rdi
00007f44`044fbab8 488b7dc0 mov rdi,qword ptr [rbp-40h]
00007f44`044fbabc 33f6 xor esi,esi
00007f44`044fbabe 48ba10f5be03447f0000 mov rdx,7F4403BEF510h
00007f44`044fbac8 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbad2 e8b1b6b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbad7 488b7db8 mov rdi,qword ptr [rbp-48h]
00007f44`044fbadb 488b75c0 mov rsi,qword ptr [rbp-40h]
00007f44`044fbadf 48b818b16e04447f0000 mov rax,7F44046EB118h
00007f44`044fbae9 393f cmp dword ptr [rdi],edi
00007f44`044fbaeb ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_ConnectionFailed(System.EventHandler`1<StackExchange.Redis.ConnectionFailedEventArgs>), mdToken: 00000000060001F9)
00007f44`044fbaed 90 nop
00007f44`044fbaee 48bf88f96e04447f0000 mov rdi,7F44046EF988h (MT: System.EventHandler`1[[StackExchange.Redis.ConnectionFailedEventArgs, StackExchange.Redis]])
00007f44`044fbaf8 e833c6dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbafd 488945b0 mov qword ptr [rbp-50h],rax
00007f44`044fbb01 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbb0b 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbb0e 48897da8 mov qword ptr [rbp-58h],rdi
00007f44`044fbb12 488b7db0 mov rdi,qword ptr [rbp-50h]
00007f44`044fbb16 33f6 xor esi,esi
00007f44`044fbb18 48ba08f5be03447f0000 mov rdx,7F4403BEF508h
00007f44`044fbb22 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbb2c e857b6b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbb31 488b7da8 mov rdi,qword ptr [rbp-58h]
00007f44`044fbb35 488b75b0 mov rsi,qword ptr [rbp-50h]
00007f44`044fbb39 48b838b16e04447f0000 mov rax,7F44046EB138h
00007f44`044fbb43 393f cmp dword ptr [rdi],edi
00007f44`044fbb45 ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_ConnectionRestored(System.EventHandler`1<StackExchange.Redis.ConnectionFailedEventArgs>), mdToken: 00000000060001FF)
00007f44`044fbb47 90 nop
00007f44`044fbb48 48bf10fc6e04447f0000 mov rdi,7F44046EFC10h (MT: System.EventHandler`1[[StackExchange.Redis.RedisErrorEventArgs, StackExchange.Redis]])
00007f44`044fbb52 e8d9c5dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbb57 488945a0 mov qword ptr [rbp-60h],rax
00007f44`044fbb5b 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbb65 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbb68 48897d98 mov qword ptr [rbp-68h],rdi
00007f44`044fbb6c 488b7da0 mov rdi,qword ptr [rbp-60h]
00007f44`044fbb70 33f6 xor esi,esi
00007f44`044fbb72 48ba00f5be03447f0000 mov rdx,7F4403BEF500h
00007f44`044fbb7c 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbb86 e8fdb5b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbb8b 488b7d98 mov rdi,qword ptr [rbp-68h]
00007f44`044fbb8f 488b75a0 mov rsi,qword ptr [rbp-60h]
00007f44`044fbb93 48b878b16e04447f0000 mov rax,7F44046EB178h
00007f44`044fbb9d 393f cmp dword ptr [rdi],edi
00007f44`044fbb9f ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_ErrorMessage(System.EventHandler`1<StackExchange.Redis.RedisErrorEventArgs>), mdToken: 000000000600020F)
00007f44`044fbba1 90 nop
00007f44`044fbba2 48bf70fe6e04447f0000 mov rdi,7F44046EFE70h (MT: System.EventHandler`1[[StackExchange.Redis.EndPointEventArgs, StackExchange.Redis]])
00007f44`044fbbac e87fc5dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbbb1 48894590 mov qword ptr [rbp-70h],rax
00007f44`044fbbb5 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbbbf 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbbc2 48897d88 mov qword ptr [rbp-78h],rdi
00007f44`044fbbc6 488b7d90 mov rdi,qword ptr [rbp-70h]
00007f44`044fbbca 33f6 xor esi,esi
00007f44`044fbbcc 48baf8f4be03447f0000 mov rdx,7F4403BEF4F8h
00007f44`044fbbd6 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbbe0 e8a3b5b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbbe5 488b7d88 mov rdi,qword ptr [rbp-78h]
00007f44`044fbbe9 488b7590 mov rsi,qword ptr [rbp-70h]
00007f44`044fbbed 48b848b16e04447f0000 mov rax,7F44046EB148h
00007f44`044fbbf7 393f cmp dword ptr [rdi],edi
00007f44`044fbbf9 ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_ConfigurationChanged(System.EventHandler`1<StackExchange.Redis.EndPointEventArgs>), mdToken: 0000000006000202)
00007f44`044fbbfb 90 nop
00007f44`044fbbfc 48bfb0017004447f0000 mov rdi,7F44047001B0h (MT: System.EventHandler`1[[StackExchange.Redis.HashSlotMovedEventArgs, StackExchange.Redis]])
00007f44`044fbc06 e825c5dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbc0b 48894580 mov qword ptr [rbp-80h],rax
00007f44`044fbc0f 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbc19 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbc1c 4889bd78ffffff mov qword ptr [rbp-88h],rdi
00007f44`044fbc23 488b7d80 mov rdi,qword ptr [rbp-80h]
00007f44`044fbc27 33f6 xor esi,esi
00007f44`044fbc29 48ba18f5be03447f0000 mov rdx,7F4403BEF518h
00007f44`044fbc33 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbc3d e846b5b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbc42 488bbd78ffffff mov rdi,qword ptr [rbp-88h]
00007f44`044fbc49 488b7580 mov rsi,qword ptr [rbp-80h]
00007f44`044fbc4d 48b868b16e04447f0000 mov rax,7F44046EB168h
00007f44`044fbc57 393f cmp dword ptr [rdi],edi
00007f44`044fbc59 ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_HashSlotMoved(System.EventHandler`1<StackExchange.Redis.HashSlotMovedEventArgs>), mdToken: 000000000600020C)
00007f44`044fbc5b 90 nop
00007f44`044fbc5c 48bf88047004447f0000 mov rdi,7F4404700488h (MT: System.EventHandler`1[[StackExchange.Redis.InternalErrorEventArgs, StackExchange.Redis]])
00007f44`044fbc66 e8c5c4dc74 call libcoreclr!JIT_NewS_MP_FastPortable (00007f44`792c8130)
00007f44`044fbc6b 48898570ffffff mov qword ptr [rbp-90h],rax
00007f44`044fbc72 48bfa0aa00e0437f0000 mov rdi,7F43E000AAA0h
00007f44`044fbc7c 488b3f mov rdi,qword ptr [rdi]
00007f44`044fbc7f 4889bd68ffffff mov qword ptr [rbp-98h],rdi
00007f44`044fbc86 488bbd70ffffff mov rdi,qword ptr [rbp-90h]
00007f44`044fbc8d 33f6 xor esi,esi
00007f44`044fbc8f 48ba20f5be03447f0000 mov rdx,7F4403BEF520h
00007f44`044fbc99 48b9e0d14eff437f0000 mov rcx,7F43FF4ED1E0h
00007f44`044fbca3 e8e0b4b2fb call 00007f44`00027188 (System.MulticastDelegate.CtorOpened(System.Object, IntPtr, IntPtr), mdToken: 00000000060004ED)
00007f44`044fbca8 488bbd68ffffff mov rdi,qword ptr [rbp-98h]
00007f44`044fbcaf 488bb570ffffff mov rsi,qword ptr [rbp-90h]
00007f44`044fbcb6 48b828b16e04447f0000 mov rax,7F44046EB128h
00007f44`044fbcc0 393f cmp dword ptr [rdi],edi
00007f44`044fbcc2 ff10 call qword ptr [rax] (StackExchange.Redis.ConnectionMultiplexer.add_InternalError(System.EventHandler`1<StackExchange.Redis.InternalErrorEventArgs>), mdToken: 00000000060001FC)
00007f44`044fbcc4 90 nop
00007f44`044fbcc5 48b8a0aa00e0437f0000 mov rax,7F43E000AAA0h
00007f44`044fbccf 488b00 mov rax,qword ptr [rax]
00007f44`044fbcd2 488945d0 mov qword ptr [rbp-30h],rax
00007f44`044fbcd6 90 nop
00007f44`044fbcd7 eb00 jmp 00007f44`044fbcd9
00007f44`044fbcd9 488b45d0 mov rax,qword ptr [rbp-30h]
00007f44`044fbcdd 4881c4d0000000 add rsp,0D0h
00007f44`044fbce4 5d pop rbp
00007f44`044fbce5 c3 ret
00007f44`044fbce6 55 push rbp
00007f44`044fbce7 4883ec10 sub rsp,10h
00007f44`044fbceb 488b2f mov rbp,qword ptr [rdi]
00007f44`044fbcee 48892c24 mov qword ptr [rsp],rbp
00007f44`044fbcf2 488dadd0000000 lea rbp,[rbp+0D0h]
00007f44`044fbcf9 8b7de8 mov edi,dword ptr [rbp-18h]
00007f44`044fbcfc 400fb6ff movzx edi,dil
00007f44`044fbd00 85ff test edi,edi
00007f44`044fbd02 740a je 00007f44`044fbd0e
00007f44`044fbd04 488b7df0 mov rdi,qword ptr [rbp-10h]
00007f44`044fbd08 e83317dd74 call libcoreclr!JIT_MonExit_Portable (00007f44`792cd440)
00007f44`044fbd0d 90 nop
00007f44`044fbd0e 90 nop
00007f44`044fbd0f 4883c410 add rsp,10h
00007f44`044fbd13 5d pop rbp
00007f44`044fbd14 c3 ret
重点来了，Wisder.xRiver.BaseCore.Util.xRedis.get_Instance() 这个方法其实是 Instance 属性的 get 方法。
可以继续使用 ip2md 命令将指令地址转换出模块信息：
0:000> !sos ip2md 00007f44`044fb96a
MethodDesc: 00007f4403caf880
Method Name: Wisder.xRiver.BaseCore.Util.xRedis.get_Instance()
Class: 00007f4403d1a278
MethodTable: 00007f4403cafe48
mdToken: 00000000060000B3
Module: 00007f440264de00
IsJitted: yes
Current CodeAddr: 00007f44044fb890
Version History:
ILCodeVersion: 0000000000000000
ReJIT ID: 0
IL Addr: 00007f447142f990
CodeAddr: 00007f44044fb890 (MinOptJitted)
NativeCodeVersion: 0000000000000000
找到模块后，查看一下信息就可以找到对应的 dll 文件：
0:000> !sos DumpModule /d 00007f440264de00
Name: /xxx/xRiver.BaseCore.dll
Attributes: PEFile IsFileLayout
TransientFlags: 00209011
Assembly: 00005558fc05f540
BaseAddress: 00007F447142A000
PEAssembly: 00005558FC03ABE0
ModuleId: 00007F440264E990
ModuleIndex: 0000000000000064
LoaderHeap: 0000000000000000
TypeDefToMethodTableMap: 00007F4402650000
TypeRefToMethodTableMap: 00007F4402650560
MethodDefToDescMap: 00007F4402650EE8
FieldDefToDescMap: 00007F4402653550
MemberRefToDescMap: 0000000000000000
FileReferencesMap: 00007F4402655948
AssemblyReferencesMap: 00007F4402655950
MetaData start address: 00007F4471444540 (148124 bytes)
那么接下来就是找到这个 dll 文件对应的源码项目，重点关注一下里面 get_Instance 方法。
namespace Wisder.xRiver.BaseCore.Util
{
public static class xRedis
{
private static ConnectionMultiplexer _instance = null;
/// <summary>
/// 使用一个静态属性来返回已连接的实例，如下列中所示。
/// 这样，一旦 ConnectionMultiplexer 断开连接，便可以初始化新的连接实例。
/// </summary>
public static ConnectionMultiplexer Instance
{
get
{
if (Constr.Length == 0)
{
throw new Exception("Redis连接字符串未设置！");
}
if (_instance == null)
{
lock (_locker)
{
if (_instance == null || !_instance.IsConnected)
{
var options = ConfigurationOptions.Parse(Constr);
options.ConnectTimeout = 10000; // 设置连接超时时间为10秒
options.SyncTimeout = 15000; // 设置同步操作的超时时间为15秒
_instance = ConnectionMultiplexer.Connect(options); //Constr
}
}
}
//注册如下事件
_instance.ConnectionFailed += MuxerConnectionFailed;
_instance.ConnectionRestored += MuxerConnectionRestored;
_instance.ErrorMessage += MuxerErrorMessage;
_instance.ConfigurationChanged += MuxerConfigurationChanged;
_instance.HashSlotMoved += MuxerHashSlotMoved;
_instance.InternalError += MuxerInternalError;
return _instance;
}
}
}
}
解决思路：把事件注册挪到最里面的 if 内部，_instance 赋值的后面。后续修改后可以观察下情况。
总结分析
一个事件注册会产生一个 64 Byte 大小的对象，不要小看它，积少成多，照样会导致内存泄露问题。
这让我不由得想起了 PHP 语言，一个请求结束就会销毁进程，可有效避免内存泄露问题，实在不行再重启一下 php 服务，也可以解决内存泄露问题。回到 .net 这一类平台上，就可以好好写代码，提高代码质量，避免内存泄露等问题。
