Question

我有一个程序，该程序具有gdb附加的300多个线程。我需要确定一个特定的线程，该线程的调用堆栈具有一个包含变量的框架，该变量的值我想用于匹配。我可以在gdb中编写脚本吗？

(gdb) thread 3
[Switching to thread 3 (Thread 0x7f16c1eeb700 (LWP 18833))]
#4  0x00007f17f3a3bdd5 in start_thread () from /lib64/libpthread.so.0
(gdb) backtrace
#0  0x00007f17f3a3fd12 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f17e72838be in __afr_shd_healer_wait (healer=healer@entry=0x7f17e05203d0) at afr-self-heald.c:101
#2  0x00007f17e728392d in afr_shd_healer_wait (healer=healer@entry=0x7f17e05203d0) at afr-self-heald.c:125
#3  0x00007f17e72848e8 in afr_shd_index_healer (data=0x7f17e05203d0) at afr-self-heald.c:572
#4  0x00007f17f3a3bdd5 in start_thread () from /lib64/libpthread.so.0
#5  0x00007f17f3302ead in clone () from /lib64/libc.so.6
(gdb) frame 3
#3  0x00007f17e72848e8 in afr_shd_index_healer (data=0x7f17e05203d0) at afr-self-heald.c:572
572                     afr_shd_healer_wait (healer);
(gdb) p this->name
$6 = 0x7f17e031b910 "testvol-replicate-0"

例如，我可以运行一个宏来遍历每个线程，转到每个线程中的第3帧，检查变量this->name并仅在值匹配testvol-replicate-0时打印thead号吗？

Answer 1

可以将Python集成到GDB中。然后，使用Python GDB API，您可以遍历线程并搜索匹配项。下面是使用GDB和Python调试线程的两个示例。

https://www.linuxjournal.com/article/11027
https://fy.blackhats.net.au/blog/html/2017/08/04/so_you_want_to_script_gdb_with_python.html

gdb脚本基于变量值隔离线程

1 个答案: