malloc（）和malloc_consolidate（）中的Segfaults [英] Segfaults in malloc() and malloc_consolidate()
问题描述
我的应用程序segfaults有时和主要在malloc（）和malloc_consolidate（）当我看看在gdb的回溯。
My application segfaults sometimes and mainly in malloc() and malloc_consolidate() when I look at the backtrace in gdb.
我验证了机器有足够的内存可用，它甚至没有开始交换。
我检查了ulimits数据分区和最大内存大小，两者都设置为unlimited。
我也在valgrind下运行应用程序，没有发现任何内存错误。
I verified that the machine has enough memory available, it didn't even start swapping. I checked ulimits for data segement and max memory size and both are set to 'unlimited'. I also ran the application under valgrind and didn't find any memory errors.
现在我的想法还有什么可能导致这些segfaults。任何想法？
Now I'm out of ideas what else might be causing these segfaults. Any Ideas ?
更新：
由于我没有找到任何与valgrind（或ptrcheck），可能是另一个应用程序正在破坏libc的内存结构，或者每个进程都有单独的结构？
Update: Since I'm not finding anything with valgrind (or ptrcheck), could it be that another application is trashing libc's memory structure or is there a separate structure for each process ?
推荐答案
另一种检查和防范在使用malloc，realloc和free时的错误是设置环境变量MALLOC_CHECK_当设置MALLOC_CHECK_时，使用一个特殊的（低效的）实现，它被设计为容忍简单的错误，比如free的double调用相同的参数，或者超过单个字节（一个错误），但并不是所有的这些错误都可以防止，并且可能导致内存泄漏，如果MALLOC_CHECK_设置为0，任何检测到的堆损坏都被忽略;如果设置为1，则会在stderr上打印诊断;如果设置为2，则会立即调用abort，这是非常有用的，因为否则可能会发生崩溃，导致问题的真正原因很难跟踪。
"Another possibility to check for and guard against bugs in the use of malloc, realloc and free is to set the environment variable MALLOC_CHECK_. When MALLOC_CHECK_ is set, a special (less efficient) implementation is used which is designed to be tolerant against simple errors, such as double calls of free with the same argument, or overruns of a single byte (off-by-one bugs). Not all such errors can be protected against, however, and memory leaks can result. If MALLOC_CHECK_ is set to 0, any detected heap corruption is silently ignored; if set to 1, a diagnostic is printed on stderr; if set to 2, abort is called immediately. This can be useful because otherwise a crash may happen much later, and the true cause for the problem is then very hard to track down."
http://www.gnu.org/s/libc/manual/html_node/Heap-Consistency-Checking.html#Heap-Consistency- Checking
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