我在 malloc() 例程中遇到分段错误。这是来自 gdb 的堆栈跟踪:
#0 0x00007ffff787e882 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff787fec6 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff7882a45 in malloc () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x0000000000403ab0 in xmalloc (size=1024) at global.c:14
#4 0x00000000004020fb in processConnectionQueue (arguments=0x60a4e0)
at connection.c:117
#5 0x00007ffff7bc4e9a in start_thread ()
from /lib/x86_64-linux-gnu/libpthread.so.0
#6 0x00007ffff78f24bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7 0x0000000000000000 in ?? ()
这是怎么回事?什么可能导致 malloc() 段错误?
编辑:这是来自 xmalloc() 的代码。这是非常标准的,从堆栈跟踪中可以看出,它正在调用大小为 1024 的 malloc。
void* xmalloc(size_t size)
{
void* result = malloc(size);
if(!result)
{
if(!size)
{
result = malloc(1);
}
if(!result)
{
fprintf(stderr, "Error allocating memory of size %zu\n", size);
exit(-1);
}
}
return result;
}
connection.c 中的第 117 行:
item->readBuffer = xmalloc(kInitialPacketBufferSize);