直接泄漏和间接泄漏有什么区别? [英] What is the difference between a direct and indirect leak?

问题描述

我从LeakSanitizer工具获得以下输出.据工具了解，直接泄漏和间接泄漏有什么区别?

I got the following output from the LeakSanitizer tool. What is the difference between a direct and indirect leak, as the tool understands it?

13: ==29107==ERROR: LeakSanitizer: detected memory leaks
13: 
13: Direct leak of 288 byte(s) in 6 object(s) allocated from:
13:     #0 0x7f2ce0089050 in __interceptor_malloc (/nix/store/zahs1kwq4742f6l6h7yy4mdj44zzc1kd-gcc-7-20170409-lib/lib/libasan.so+0xd9050)
13:     #1 0x7f2cdfb974fe in qdr_core_subscribe ../src/router_core/route_tables.c:149
13:     #2 0x7f2cdfb47ff0 in IoAdapter_init ../src/python_embedded.c:548
13:     #3 0x7f2cde966ecd in type_call (/nix/store/1snk2wkpv97an87pk1842fgskl1vqhkr-python-2.7.14/lib/libpython2.7.so.1.0+0x9fecd)
13: 
13: Indirect leak of 2368 byte(s) in 1 object(s) allocated from:
13:     #0 0x7f2ce0089b88 in __interceptor_posix_memalign (/nix/store/zahs1kwq4742f6l6h7yy4mdj44zzc1kd-gcc-7-20170409-lib/lib/libasan.so+0xd9b88)
13:     #1 0x7f2cdfbcc8ea in qd_alloc ../src/alloc_pool.c:182
13:     #2 0x7f2cdfbb6c6b in qd_server_connection ../src/server.c:500
13:     #3 0x7f2cdfbbe27d in on_accept ../src/server.c:531
13:     #4 0x7f2cdfbbe27d in handle_listener ../src/server.c:701
13:     #5 0x7f2cdfbbe27d in handle ../src/server.c:844
13:     #6 0x7f2cdfbc2837 in thread_run ../src/server.c:921
13:     #7 0x7f2cdf0ba233 in start_thread (/nix/store/zpg78y1mf0di6127q6r51kgx2q8cxsvv-glibc-2.25-49/lib/libpthread.so.0+0x7233)
[...]

推荐答案

LSan Wiki 设计文档指出:

The LSan wiki design document states:

另一个有用的功能是能够区分直接泄漏 块(无法从任何地方访问)和间接泄漏的块(可访问) 来自其他泄漏的块).

Another useful feature is being able to distinguish between directly leaked blocks (not reachable from anywhere) and indirectly leaked blocks (reachable from other leaked blocks).

换句话说，间接泄漏是直接泄漏的结果.修复直接泄漏应使间接泄漏本身成为固定泄漏或直接泄漏(分别取决于其内存管理是否正确实施).

Stated another way, indirect leaks are a result of direct leaks. Fixing direct leaks should make the indirect leaks become either fixed or direct leaks themselves (depending on whether their memory management is implemented correctly or not, respectively).

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