c++ - 为什么我的 C++/QT 应用程序在 Linux x86_64 上的 nanosleep() 中崩溃？

Question

我在 x86_64 上的 Ubuntu 12.10 下运行用 Qt/C++ 编写的服务器端 webkit 渲染器。 Qt 是 4.8.4 定制构建以及 qtwebkit 2.3。

在大约 5% 的渲染任务中，应用程序会像那样崩溃(gdb 日志):

This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/something...done.
[New LWP 27328]
[New LWP 27825]
[New LWP 27807]
[New LWP 28981]
[New LWP 27808]
[New LWP 28387]
[New LWP 28575]
[New LWP 28837]
[New LWP 28879]
[New LWP 28891]
[New LWP 27326]
[New LWP 28420]
[New LWP 28681]

warning: Can't read pathname for load map: Input/output error.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/home/something'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f793a58183d in nanosleep () at ../sysdeps/unix/syscall-template.S:82
82  ../sysdeps/unix/syscall-template.S: No such file or directory.
#0  0x00007f793a58183d in nanosleep () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f793a5816dc in __sleep (seconds=0) at ../sysdeps/unix/sysv/linux/sleep.c:138
#2  0x00007f793db80014 in ?? () from /usr/local/qt-4.8.4-git/lib/libQtWebKit.so.4
#3  0x00007f793db80309 in ?? () from /usr/local/qt-4.8.4-git/lib/libQtWebKit.so.4
#4  0x00007f793b09de9a in start_thread (arg=0x7f7934b41700) at pthread_create.c:308
#5  0x00007f793a5b5cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
(gdb) quit

这怎么可能？我能做些什么来缓解这次崩溃？

更新:此处其他线程的回溯:http://pastie.org/5623164

Answer 1

事实证明，这是一个错误的回溯。在用相同的构建但使用调试符号替换 libQtWebKit 之后，我得到了一个完全不同的有意义的回溯。

tl;dr - nanosleep() 中没有崩溃，这只是 gdb 的错误解析。