Getting a backtrace of other thread

Question

In Linux, to get a backtrace you can use backtrace() library call, but it only returns backtrace of current thread. Is there any way to get a backtrace of some other thread,

Answer 1

gdb provides these facilities for debugging multi-thread programs:

• automatic notification of new threads
• ‘thread thread-id’, a command to switch among threads
• ‘info threads’, a command to inquire about existing threads
• ‘thread apply [thread-id-list] [all] args’, a command to apply a command to a list of threads
• thread-specific breakpoints
• ‘set print thread-events’, which controls printing of messages on thread start and exit.
• ‘set libthread-db-search-path path’, which lets the user specify which libthread_db to use if the default choice isn't compatible with the program.

So just goto required thread in GDB by cmd: 'thread thread-id'. Then do 'bt' in that thread context to print the thread backtrace.