GDB调试内存泄露（CentOS7 实战记录）
首先感谢《一种定位内存泄露的方法（Linux）》这片文章。基本思路是一致的。
本文追加了对于后续内存如何查看对象数据的方法。
先POST一下原来第三方文章，主要关注其思想理念：
目的：
本文是《一种定位内存泄露的方法（Solaris）》对应的Linux版本，调试器使用gdb。主要介绍实例部分。其他请见《一种定位内存泄露的方法（Solaris）》。
模拟new失败的程序：
#include 1） 编译运行此段代码。产生一个core文件
2） 用gdb打开这个core文件：
gdb a.out core
(gdb) run
Starting program: /test/new_fail/a.out
terminate called after throwing an instance of 'std::bad_alloc'
what(): std::bad_alloc
Program received signal SIGABRT, Aborted.
0x00007ffff733f645 in raise () from /lib64/libc.so.6
(gdb) info proc
process 10683
cmdline = '/test/new_fail/a.out'
cwd = '/test/new_fail'
exe = '/test/new_fail/a.out'
(gdb) shell pmap 10683
10683: a.out
START SIZE RSS PSS DIRTY SWAP PERM MAPPING
0000000000400000 4K 4K 4K 0K 0K r-xp /test/new_fail/a.out
0000000000600000 4K 4K 4K 4K 0K r--p /test/new_fail/a.out
0000000000601000 4K 4K 4K 4K 0K rw-p /test/new_fail/a.out
0000000000602000 132K 32K 32K 32K 0K rw-p [heap]
…（略）
Total: 11468K 1048K 684K 180K 0K
360K writable-private, 11108K readonly-private, 0K shared, and 1048K referenced可以看到heap空间的起始地址是0x0000000000602000，共132K字节，即132*1024=135168字节。
3） 因为是64位应用程序，所以指针占8字节。所以需要遍历的指针个数为135168/8=16896。
4） 将结果输出到日志文件gdb.txt中：
(gdb) set height 0
(gdb) set logging on
Copying output to gdb.txt.
(gdb) x/16896a 0x0000000000602000gdb.txt的内容：
0x602000: 0x0 0x21
0x602010: 0x400b30 <_ZTV3ABC+16> 0x0
0x602020: 0x0 0x21
0x602030: 0x400b30 <_ZTV3ABC+16> 0x0
….5） 过滤gdb.txt：
awk '{print $2"/n"$3}' gdb.txt|C++filt|grep vtable>gdb_vtable.txtgdb_vtable.txt的内容为：
for ABC+16>
for ABC+16>
for ABC+16>
for ABC+16> 6） 将gdb_vtable.txt的内容导入到SQLServer中（如果记录不多，可以用Excel代替）。表名为gdb_vtable，第一列Col001为符号。对其分组求和：
select Col001, count(1) quantity from gdb_vtable
group by Col001
order by quantity desc结果为：
Col001 quantity
for ABC+16> 1000
for std::bad_alloc@@GLIBCXX_3.4+16> 可知core里有1000个ABC，遍历使用ABC的代码，可知存在泄漏。
参考上述的文章，我们进行实战排查并记录全过程。
[root@mcu_rrs sips]# ps faxu
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 2 0.0 0.0 0 0 ? S 3月14 0:00 [kthreadd]
……
root 3592 11.8 25.3 9110048 2009168 ? Sl 3月14 179:33 \_ ./H323Gateway -x -c -i ../etc/H323Gateway.conf -m s.cgw.10.35.10.53 -n s.h323gw.10.35.10.53 -b tcp://127.0.0.1:10882
……可以看到H323Gateway进程RSS巨大，明显存在内存泄漏
[root@mcu_rrs sips]# pmap 3592
3592: ./H323Gateway -x -c -i ../etc/H323Gateway.conf -m s.cgw.10.35.10.53 -n s.h323gw.10.35.10.53 -b tcp://127.0.0.1:10882
0000000000400000 1380K r-x-- H323Gateway
0000000000759000 4K r---- H323Gateway
000000000075a000 12K rw--- H323Gateway
000000000075d000 16K rw--- [ anon ]
0000000002148000 2604K rw--- [ anon ]
00007f6eac000000 54268K rw--- [ anon ]
00007f6eaf4ff000 11268K ----- [ anon ]
00007f6eb4000000 65536K rw--- [ anon ]
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00007f71ff114000 2048K ----- libX11.so.6.3.0
00007f71ff314000 4K r---- libX11.so.6.3.0
00007f71ff315000 20K rw--- libX11.so.6.3.0
00007f71ff31a000 56K r-x-- libdrm.so.2.4.0
00007f71ff328000 2044K ----- libdrm.so.2.4.0
00007f71ff527000 4K r---- libdrm.so.2.4.0
00007f71ff528000 4K rw--- libdrm.so.2.4.0
00007f71ff529000 12K r-x-- libkeyutils.so.1.5
00007f71ff52c000 2044K ----- libkeyutils.so.1.5
00007f71ff72b000 4K r---- libkeyutils.so.1.5
00007f71ff72c000 4K rw--- libkeyutils.so.1.5
00007f71ff72d000 52K r-x-- libkrb5support.so.0.1
00007f71ff73a000 2044K ----- libkrb5support.so.0.1
00007f71ff939000 4K r---- libkrb5support.so.0.1
00007f71ff93a000 4K rw--- libkrb5support.so.0.1
00007f71ff93b000 32K r-x-- libcrypt-2.17.so
00007f71ff943000 2044K ----- libcrypt-2.17.so
00007f71ffb42000 4K r---- libcrypt-2.17.so
00007f71ffb43000 4K rw--- libcrypt-2.17.so
00007f71ffb44000 184K rw--- [ anon ]
00007f71ffb72000 696K r-x-- libfdk-aac.so.1.0.0
00007f71ffc20000 2044K ----- libfdk-aac.so.1.0.0
00007f71ffe1f000 8K r---- libfdk-aac.so.1.0.0
00007f71ffe21000 4K rw--- libfdk-aac.so.1.0.0
00007f71ffe22000 8K rw--- [ anon ]
00007f71ffe24000 1136K r-x-- libx264.so.142
00007f71fff40000 2044K ----- libx264.so.142
00007f720013f000 4K r---- libx264.so.142
00007f7200140000 4K rw--- libx264.so.142
00007f7200141000 492K rw--- [ anon ]
00007f72001bc000 3640K r-x-- libx265.so.68
00007f720054a000 2044K ----- libx265.so.68
00007f7200749000 8K r---- libx265.so.68
00007f720074b000 4K rw--- libx265.so.68
00007f720074c000 20K rw--- [ anon ]
00007f7200751000 312K r-x-- libavutil.so.55.9.100
00007f720079f000 2048K ----- libavutil.so.55.9.100
00007f720099f000 64K r---- libavutil.so.55.9.100
00007f72009af000 4K rw--- libavutil.so.55.9.100
00007f72009b0000 80K rw--- [ anon ]
00007f72009c4000 96K r-x-- libswresample.so.2.0.101
00007f72009dc000 2048K ----- libswresample.so.2.0.101
00007f7200bdc000 8K r---- libswresample.so.2.0.101
00007f7200bde000 4K rw--- libswresample.so.2.0.101
00007f7200bdf000 1704K r-x-- i965_drv_video.so
00007f7200d89000 2044K ----- i965_drv_video.so
00007f7200f88000 4K r---- i965_drv_video.so
00007f7200f89000 16K rw--- i965_drv_video.so
00007f7200f8d000 16K r-x-- libva-x11.so.1.3800.0
00007f7200f91000 2044K ----- libva-x11.so.1.3800.0
00007f7201190000 4K r---- libva-x11.so.1.3800.0
00007f7201191000 4K rw--- libva-x11.so.1.3800.0
00007f7201192000 1828K r-x-- libavformat.so.57.19.100
00007f720135b000 2048K ----- libavformat.so.57.19.100
00007f720155b000 76K r---- libavformat.so.57.19.100
00007f720156e000 88K rw--- libavformat.so.57.19.100
00007f7201584000 8K r-x-- libva-drm.so.1.3800.0
00007f7201586000 2044K ----- libva-drm.so.1.3800.0
00007f7201785000 4K r---- libva-drm.so.1.3800.0
00007f7201786000 4K rw--- libva-drm.so.1.3800.0
00007f7201787000 108K r-x-- libva.so.1.3800.0
00007f72017a2000 2044K ----- libva.so.1.3800.0
00007f72019a1000 4K r---- libva.so.1.3800.0
00007f72019a2000 4K rw--- libva.so.1.3800.0
00007f72019a3000 84K r-x-- libz.so.1.2.7
00007f72019b8000 2044K ----- libz.so.1.2.7
00007f7201bb7000 4K r---- libz.so.1.2.7
00007f7201bb8000 4K rw--- libz.so.1.2.7
00007f7201bb9000 12K r-x-- libcom_err.so.2.1
00007f7201bbc000 2044K ----- libcom_err.so.2.1
00007f7201dbb000 4K r---- libcom_err.so.2.1
00007f7201dbc000 4K rw--- libcom_err.so.2.1
00007f7201dbd000 196K r-x-- libk5crypto.so.3.1
00007f7201dee000 2044K ----- libk5crypto.so.3.1
00007f7201fed000 8K r---- libk5crypto.so.3.1
00007f7201fef000 4K rw--- libk5crypto.so.3.1
00007f7201ff0000 864K r-x-- libkrb5.so.3.3
00007f72020c8000 2044K ----- libkrb5.so.3.3
00007f72022c7000 56K r---- libkrb5.so.3.3
00007f72022d5000 12K rw--- libkrb5.so.3.3
00007f72022d8000 296K r-x-- libgssapi_krb5.so.2.2
00007f7202322000 2048K ----- libgssapi_krb5.so.2.2
00007f7202522000 4K r---- libgssapi_krb5.so.2.2
00007f7202523000 8K rw--- libgssapi_krb5.so.2.2
00007f7202525000 228K r-x-- libnspr4.so
00007f720255e000 2048K ----- libnspr4.so
00007f720275e000 4K r---- libnspr4.so
00007f720275f000 8K rw--- libnspr4.so
00007f7202761000 8K rw--- [ anon ]
00007f7202763000 16K r-x-- libplc4.so
00007f7202767000 2044K ----- libplc4.so
00007f7202966000 4K r---- libplc4.so
00007f7202967000 4K rw--- libplc4.so
00007f7202968000 12K r-x-- libplds4.so
00007f720296b000 2044K ----- libplds4.so
00007f7202b6a000 4K r---- libplds4.so
00007f7202b6b000 4K rw--- libplds4.so
00007f7202b6c000 148K r-x-- libnssutil3.so
00007f7202b91000 2048K ----- libnssutil3.so
00007f7202d91000 24K r---- libnssutil3.so
00007f7202d97000 4K rw--- libnssutil3.so
00007f7202d98000 1144K r-x-- libnss3.so
00007f7202eb6000 2044K ----- libnss3.so
00007f72030b5000 20K r---- libnss3.so
00007f72030ba000 8K rw--- libnss3.so
00007f72030bc000 8K rw--- [ anon ]
00007f72030be000 144K r-x-- libsmime3.so
00007f72030e2000 2044K ----- libsmime3.so
00007f72032e1000 12K r---- libsmime3.so
00007f72032e4000 4K rw--- libsmime3.so
00007f72032e5000 244K r-x-- libssl3.so
00007f7203322000 2048K ----- libssl3.so
00007f7203522000 12K r---- libssl3.so
00007f7203525000 4K rw--- libssl3.so
00007f7203526000 4K rw--- [ anon ]
00007f7203527000 160K r-x-- libssh2.so.1.0.1
00007f720354f000 2048K ----- libssh2.so.1.0.1
00007f720374f000 4K r---- libssh2.so.1.0.1
00007f7203750000 4K rw--- libssh2.so.1.0.1
00007f7203751000 200K r-x-- libidn.so.11.6.11
00007f7203783000 2044K ----- libidn.so.11.6.11
00007f7203982000 4K r---- libidn.so.11.6.11
00007f7203983000 4K rw--- libidn.so.11.6.11
00007f7203984000 88K r-x-- libresolv-2.17.so
00007f720399a000 2048K ----- libresolv-2.17.so
00007f7203b9a000 4K r---- libresolv-2.17.so
00007f7203b9b000 4K rw--- libresolv-2.17.so
00007f7203b9c000 8K rw--- [ anon ]
00007f7203b9e000 156K r-x-- libexpat.so.1.6.0
00007f7203bc5000 2048K ----- libexpat.so.1.6.0
00007f7203dc5000 8K r---- libexpat.so.1.6.0
00007f7203dc7000 4K rw--- libexpat.so.1.6.0
00007f7203dc8000 2256K r-x-- libcrypto.so.1.0.2k
00007f7203ffc000 2048K ----- libcrypto.so.1.0.2k
00007f72041fc000 112K r---- libcrypto.so.1.0.2k
00007f7204218000 52K rw--- libcrypto.so.1.0.2k
00007f7204225000 16K rw--- [ anon ]
00007f7204229000 412K r-x-- libssl.so.1.0.2k
00007f7204290000 2048K ----- libssl.so.1.0.2k
00007f7204490000 16K r---- libssl.so.1.0.2k
00007f7204494000 28K rw--- libssl.so.1.0.2k
00007f720449b000 344K r-x-- libldap_r-2.4.so.2.10.3
00007f72044f1000 2048K ----- libldap_r-2.4.so.2.10.3
00007f72046f1000 12K r---- libldap_r-2.4.so.2.10.3
00007f72046f4000 4K rw--- libldap_r-2.4.so.2.10.3
00007f72046f5000 8K rw--- [ anon ]
00007f72046f7000 56K r-x-- liblber-2.4.so.2.10.3
00007f7204705000 2044K ----- liblber-2.4.so.2.10.3
00007f7204904000 4K r---- liblber-2.4.so.2.10.3
00007f7204905000 4K rw--- liblber-2.4.so.2.10.3
00007f7204906000 320K r-x-- libldap-2.4.so.2.10.3
00007f7204956000 2044K ----- libldap-2.4.so.2.10.3
00007f7204b55000 12K r---- libldap-2.4.so.2.10.3
00007f7204b58000 4K rw--- libldap-2.4.so.2.10.3
00007f7204b59000 112K r-x-- libsasl2.so.3.0.0
00007f7204b75000 2044K ----- libsasl2.so.3.0.0
00007f7204d74000 4K r---- libsasl2.so.3.0.0
00007f7204d75000 4K rw--- libsasl2.so.3.0.0
00007f7204d76000 28K r-x-- librt-2.17.so
00007f7204d7d000 2044K ----- librt-2.17.so
00007f7204f7c000 4K r---- librt-2.17.so
00007f7204f7d000 4K rw--- librt-2.17.so
00007f7204f7e000 32K r-x-- libG7221Enc.so
00007f7204f86000 2044K ----- libG7221Enc.so
00007f7205185000 24K rw--- libG7221Enc.so
00007f720518b000 48K rw--- [ anon ]
00007f7205197000 28K r-x-- libG7221Dec.so
00007f720519e000 2044K ----- libG7221Dec.so
00007f720539d000 20K rw--- libG7221Dec.so
00007f72053a2000 48K rw--- [ anon ]
00007f72053ae000 116K r-x-- libG722Enc.so
00007f72053cb000 2048K ----- libG722Enc.so
00007f72055cb000 4K rw--- libG722Enc.so
00007f72055cc000 1136K rw--- [ anon ]
00007f72056e8000 136K r-x-- libG722Dec.so
00007f720570a000 2044K ----- libG722Dec.so
00007f7205909000 8K rw--- libG722Dec.so
00007f720590b000 1132K rw--- [ anon ]
00007f7205a26000 284K r-x-- libopus.so.0.5.2
00007f7205a6d000 2048K ----- libopus.so.0.5.2
00007f7205c6d000 4K r---- libopus.so.0.5.2
00007f7205c6e000 4K rw--- libopus.so.0.5.2
00007f7205c6f000 496K r-x-- libswscale.so.4.0.100
00007f7205ceb000 2048K ----- libswscale.so.4.0.100
00007f7205eeb000 4K r---- libswscale.so.4.0.100
00007f7205eec000 4K rw--- libswscale.so.4.0.100
00007f7205eed000 32K rw--- [ anon ]
00007f7205ef5000 10796K r-x-- libavcodec.so.57.16.100
00007f7206980000 2048K ----- libavcodec.so.57.16.100
00007f7206b80000 156K r---- libavcodec.so.57.16.100
00007f7206ba7000 136K rw--- libavcodec.so.57.16.100
00007f7206bc9000 6672K rw--- [ anon ]
00007f720724d000 1748K r-x-- libDynamicCodec.so.1.85770
00007f7207402000 2048K ----- libDynamicCodec.so.1.85770
00007f7207602000 20K r---- libDynamicCodec.so.1.85770
00007f7207607000 40K rw--- libDynamicCodec.so.1.85770
00007f7207611000 4K rw--- [ anon ]
00007f7207612000 8K r-x-- libdl-2.17.so
00007f7207614000 2048K ----- libdl-2.17.so
00007f7207814000 4K r---- libdl-2.17.so
00007f7207815000 4K rw--- libdl-2.17.so
00007f7207816000 92K r-x-- libpthread-2.17.so
00007f720782d000 2044K ----- libpthread-2.17.so
00007f7207a2c000 4K r---- libpthread-2.17.so
00007f7207a2d000 4K rw--- libpthread-2.17.so
00007f7207a2e000 16K rw--- [ anon ]
00007f7207a32000 1760K r-x-- libc-2.17.so
00007f7207bea000 2048K ----- libc-2.17.so
00007f7207dea000 16K r---- libc-2.17.so
00007f7207dee000 8K rw--- libc-2.17.so
00007f7207df0000 20K rw--- [ anon ]
00007f7207df5000 84K r-x-- libgcc_s-4.8.5-20150702.so.1
00007f7207e0a000 2044K ----- libgcc_s-4.8.5-20150702.so.1
00007f7208009000 4K r---- libgcc_s-4.8.5-20150702.so.1
00007f720800a000 4K rw--- libgcc_s-4.8.5-20150702.so.1
00007f720800b000 1028K r-x-- libm-2.17.so
00007f720810c000 2044K ----- libm-2.17.so
00007f720830b000 4K r---- libm-2.17.so
00007f720830c000 4K rw--- libm-2.17.so
00007f720830d000 932K r-x-- libstdc++.so.6.0.19
00007f72083f6000 2048K ----- libstdc++.so.6.0.19
00007f72085f6000 32K r---- libstdc++.so.6.0.19
00007f72085fe000 8K rw--- libstdc++.so.6.0.19
00007f7208600000 84K rw--- [ anon ]
00007f7208615000 708K r-x-- libsqlite3.so.0.8.6
00007f72086c6000 2044K ----- libsqlite3.so.0.8.6
00007f72088c5000 8K r---- libsqlite3.so.0.8.6
00007f72088c7000 12K rw--- libsqlite3.so.0.8.6
00007f72088ca000 400K r-x-- libcurl.so.4.3.0
00007f720892e000 2048K ----- libcurl.so.4.3.0
00007f7208b2e000 8K r---- libcurl.so.4.3.0
00007f7208b30000 4K rw--- libcurl.so.4.3.0
00007f7208b31000 4K rw--- [ anon ]
00007f7208b32000 304K r-x-- libzmq.so.4
00007f7208b7e000 2044K ----- libzmq.so.4
00007f7208d7d000 16K r---- libzmq.so.4
00007f7208d81000 4K rw--- libzmq.so.4
00007f7208d82000 9316K r-x-- libh323_x86_64_.so.1.26.5
00007f720969b000 2048K ----- libh323_x86_64_.so.1.26.5
00007f720989b000 596K r---- libh323_x86_64_.so.1.26.5
00007f7209930000 72K rw--- libh323_x86_64_.so.1.26.5
00007f7209942000 24K rw--- [ anon ]
00007f7209948000 4056K r-x-- libpt.so.2.12.8
00007f7209d3e000 2048K ----- libpt.so.2.12.8
00007f7209f3e000 332K r---- libpt.so.2.12.8
00007f7209f91000 48K rw--- libpt.so.2.12.8
00007f7209f9d000 32K rw--- [ anon ]
00007f7209fa5000 252K r-x-- libjson.so
00007f7209fe4000 2048K ----- libjson.so
00007f720a1e4000 4K r---- libjson.so
00007f720a1e5000 8K rw--- libjson.so
00007f720a1e7000 296K r-x-- libDynamicCodecForGW.so
00007f720a231000 2044K ----- libDynamicCodecForGW.so
00007f720a430000 8K r---- libDynamicCodecForGW.so
00007f720a432000 16K rw--- libDynamicCodecForGW.so
00007f720a436000 1872K r-x-- libraknet.so
00007f720a60a000 2048K ----- libraknet.so
00007f720a80a000 16K r---- libraknet.so
00007f720a80e000 36K rw--- libraknet.so
00007f720a817000 52K rw--- [ anon ]
00007f720a824000 1372K r-x-- libRakNetForC.so.1.79956
00007f720a97b000 2044K ----- libRakNetForC.so.1.79956
00007f720ab7a000 16K r---- libRakNetForC.so.1.79956
00007f720ab7e000 28K rw--- libRakNetForC.so.1.79956
00007f720ab85000 8K rw--- [ anon ]
00007f720ab87000 132K r-x-- ld-2.17.so
00007f720abad000 4K ----- [ anon ]
00007f720abae000 256K rw--- [ anon ]
00007f720abee000 4K ----- [ anon ]
00007f720abef000 256K rw--- [ anon ]
00007f720ac2f000 4K ----- [ anon ]
00007f720ac30000 256K rw--- [ anon ]
00007f720ac70000 4K ----- [ anon ]
00007f720ac71000 256K rw--- [ anon ]
00007f720acb1000 4K ----- [ anon ]
00007f720acb2000 256K rw--- [ anon ]
00007f720acf2000 4K ----- [ anon ]
00007f720acf3000 256K rw--- [ anon ]
00007f720ad33000 4K ----- [ anon ]
00007f720ad34000 388K rw--- [ anon ]
00007f720ada4000 16K rw--- [ anon ]
00007f720ada8000 4K r---- ld-2.17.so
00007f720ada9000 4K rw--- ld-2.17.so
00007f720adaa000 4K rw--- [ anon ]
00007ffcc492a000 132K rw--- [ stack ]
00007ffcc49cb000 8K r-x-- [ anon ]
ffffffffff600000 4K r-x-- [ anon ]
total 9110048K
出现大量的[anon]的堆信息。一般这些属于主程序的堆。
随意选一个看起来很大的堆进行调试
(gdb) x/16896a 0x00007f6f84000000
……
出现了很多，我们节选一段
……
0x7f6f84020ce0: 0xa2c65736c610000 0x75df80 <_ZTV7PString+16> <---我们选择查看了此PString
0x7f6f84020cf0: 0x5373692200000000 0x7f6f84020d30
0x7f6f84020d00: 0x7274203a00000001 0x7f6f84020d50
0x7f6f84020d10: 0x920202001 0x3a2022656d010100
0x7f6f84020d20: 0x200a223031332220 0x25
0x7f6f84020d30: 0x10000000a 0x7f71d8000001
0x7f6f84020d40: 0x0 0x25
0x7f6f84020d50: 0x2e302e302e373231 0x7f71d8000031
0x7f6f84020d60: 0x0 0x25
0x7f6f84020d70: 0x100000004 0x7f71d8000001
0x7f6f84020d80: 0x0 0x25
0x7f6f84020d90: 0x393231 0x7f71d8000000
0x7f6f84020da0: 0x0 0x95
0x7f6f84020db0: 0x1312d8100000001 0x75df80 <_ZTV7PString+16>
0x7f6f84020dc0: 0x0 0x7f6f84020d70
0x7f6f84020dd0: 0x64656c6c00000001 0x7f6f84020d90
0x7f6f84020de0: 0x3200a2c01 0x120202000
---Type <return> to continue, or q <return> to quit---
0x7f6f84020df0: 0x6172656d61430000 0x75df80 <_ZTV7PString+16>
0x7f6f84020e00: 0x20200a2c00000000 0x7f6f84020e40
0x7f6f84020e10: 0x7369447300000001 0x7f6f84020e60
0x7f6f84020e20: 0x9203a2001 0x2020202020010100
0x7f6f84020e30: 0x6922202020202020 0x25
0x7f6f84020e40: 0x10000000a 0x7f71d8000001
0x7f6f84020e50: 0x0 0x25
0x7f6f84020e60: 0x2e302e302e373231 0x7f71d8000031
0x7f6f84020e70: 0x0 0x25
0x7f6f84020e80: 0x100000004 0x7f71d8000001
0x7f6f84020e90: 0x0 0x25
0x7f6f84020ea0: 0x383231 0x7f71d8000000
0x7f6f84020eb0: 0x0 0x95
0x7f6f84020ec0: 0x1312d8000000001 0x75df80 <_ZTV7PString+16>
0x7f6f84020ed0: 0x0 0x7f6f84020e80
0x7f6f84020ee0: 0x7053736900000001 0x7f6f84020ea0
0x7f6f84020ef0: 0x33a202201 0x1200a2c00
0x7f6f84020f00: 0x2220202020200000 0x75df80 <_ZTV7PString+16>
0x7f6f84020f10: 0x20200a2200000000 0x7f6f84020f50
0x7f6f84020f20: 0x2020202000000001 0x7f6f84020f70
0x7f6f84020f30: 0x920202001 0x3a2022726c010100
0x7f6f84020f40: 0x200a2c6575727420 0x25
0x7f6f84020f50: 0x10000000a 0x7f71d8000001
0x7f6f84020f60: 0x0 0x25
0x7f6f84020f70: 0x2e302e302e373231 0x7f71d8000031
0x7f6f84020f80: 0x0 0x25
0x7f6f84020f90: 0x100000004 0x7f71d8000001
0x7f6f84020fa0: 0x0 0x25
0x7f6f84020fb0: 0x373231 0x7f71d8000000
0x7f6f84020fc0: 0x0 0x95
0x7f6f84020fd0: 0x1312d7f00000001 0x75df80 <_ZTV7PString+16> <---我们选择查看了此PString
0x7f6f84020fe0: 0x0 0x7f6f84020f90
0x7f6f84020ff0: 0x2020200a00000001 0x7f6f84020fb0
(gdb) p *((PString*) 0x7f6f84020fd8)
$2 = {<PCharArray> = {<PBaseArray<char>> = {<PAbstractArray> = {<PContainer> = {<PObject> = {_vptr.PObject = 0x75df80 <vtable for PString+16>, m_traceContextIdentifier = 0}, reference = 0x7f6f84020f90}, elementSize = 1,
theArray = 0x7f6f84020fb0 "127", allocatedDynamically = true}, <No data fields>}, <No data fields>}, m_length = 3}
(gdb) p *((PString*) 0x7f6f84020ce8)
$3 = {<PCharArray> = {<PBaseArray<char>> = {<PAbstractArray> = {<PContainer> = {<PObject> = {_vptr.PObject = 0x75df80 <vtable for PString+16>, m_traceContextIdentifier = 0}, reference = 0x7f6f84020d30}, elementSize = 1,
theArray = 0x7f6f84020d50 "127.0.0.1", allocatedDynamically = true}, <No data fields>}, <No data fields>}, m_length = 9}
可以明显看到，存在大量的PString类泄露。由于我们是8进制一组，且指针出现在了右侧，所以我们应当在左侧地址偏移8，得到PString类的指针地址。打印发现里面存在着这些信息。可以多尝试几组打印值。接着就可以结合业务，猜测出来是那块代码发生了泄露。