linux程序没有回答。我怎么知道哪个例程导致了卡住？

Question

我的公司服务器应用程序遇到问题。我不能杀死它，因为我认为我下次将无法重现此错误。所以我想知道如何才能获得有关此程序卡住原因的最大信息，包括但不限于其中的功能或例程。

如何知道当前正在执行哪个过程？

Answer 1

您可以使用 gdb --pid=PID 调试进程，backtrace 将为您提供堆栈跟踪以找出函数。

--pid=PID          Attach to running process PID.

sleep 的例子

$ sleep 1000 &
[2] 13221
$ gdb --pid=13221
GNU gdb (GDB) Fedora 7.7.1-13.fc20
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
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Attaching to process 13221
Reading symbols from /usr/bin/sleep...Reading symbols from /usr/bin/sleep...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x0000003122abc970 in __nanosleep_nocancel () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install coreutils-8.21-21.fc20.x86_64
(gdb) backtrace 
#0  0x0000003122abc970 in __nanosleep_nocancel () from /lib64/libc.so.6
#1  0x00000000004040cf in rpl_nanosleep ()
#2  0x0000000000403f30 in xnanosleep ()
#3  0x00000000004018ed in main ()
(gdb)