Valgrind报告转储丢失的内存内容 [英] Dumping contents of lost memory reported by Valgrind

问题描述

当我在程序上运行valgrind --leak-check=yes时，报告了一些字节的内存丢失.是否可以查看该内存的内容(即转储存储在其中的数据)?

When I run valgrind --leak-check=yes on a program, a few bytes of lost memory are reported. Is it possible to view the contents of this memory (i.e. dump the data that is stored in it)?

推荐答案

您可以使用最新版本的Valgrind(3.8.1)来做到这一点:

You can do that with the last version of Valgrind (3.8.1):

启动可执行文件，在启动时激活gdbserver:

Start your executable activating the gdbserver at startup:

valgrind --vgdb-error=0 ....<your program>

然后在另一个窗口中，将gdb连接到Valgrind(遵循指示) 由Valgrind提供). 然后在相关位置(例如main的末尾)放置一个断点 并使用gdb

Then in another window, connect a gdb to Valgrind (following the indications given by Valgrind). Then put a breakpoint at a relevant place (e.g. at the end of main) and use the gdb

continue

命令，直到到达断点. 然后从gdb进行泄漏搜索:

command till the breakpoint is reached. Then do a leak search from gdb:

   monitor leak_check full reachable any

然后列出相关损失记录nr的可到达块的地址

Then list the address(es) of the reachable blocks of the relevant loss record nr

   monitor block_list <loss_record_nr>

然后可以使用gdb功能检查给定地址的内存. 另请注意可能有趣的命令"who_points_at" 如果您要搜索谁保留了指向该内存的指针.

You can then use gdb features to examine the memory of the given address(es). Note also the potentially interesting command "who_points_at" if you are searching who has kept a pointer to this memory.

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