Info:gdb can attach to running processes and dump stack traces without stopping them. Essential for debugging production issues where you cannot restart the service.
Examples:
$ sudo gdb -p $(pgrep nginx) -batch -ex 'bt'
$ sudo strace -p 1234 -f -e trace=network
$ sudo perf record -p 1234 -g sleep 30
Note:gdb briefly pauses the process. For production, use perf or strace for less impact. Requires debug symbols for best results.
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linuxteck@ubuntu:~$ sudo gdb -p 1234 -batch -ex 'thread apply all bt' -ex 'quit'
Attaching to process 1234
Thread 5 (Thread 0x7f8a1234):
#0 0x00007f8a5678 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x0000555555555678 in event_loop () at server.c:245
#2 0x0000555555555123 in main () at server.c:512
Detaching from process 1234
linuxteck@ubuntu:~$
John Britto Founder & Chief-Editor @LinuxTeck. A Computer Geek and Linux Intellectual having more than 20+ years of experience in Linux and Open Source technologies.
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