I am running pstack to find function stack for my application running on two machines (both RHEL)
In one of my machine it is working as expected
[root@civ4cez191 bin]# pstack 22947
Thread 2 (Thread 0x7f63cbe7d700 (LWP 22949)):
#0 0x0000003c3640f0cd in pause () from /lib64/libpthread.so.0
#1 0x0000000000485a78 in _signalWaitThread(void*) ()
#2 0x0000003c36407aa1 in start_thread () from /lib64/libpthread.so.0
#3 0x0000003c360e8aad in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7f63d2d07700 (LWP 22947)):
#0 0x0000003c360e1523 in select () from /lib64/libc.so.6
#1 0x00000000004ccc36 in TFDSETSelect(void*, void*, int) ()
#2 0x00000000004cb50f in SvrInit1(unsigned int (*)(void*, void**), unsigned int (*)(void*, void*, void**, unsigned int*), void (*)(void*), unsigned int (*)(unsigned short, unsigned short), void (*)(unsigned short, unsigned short), void (*)(unsigned short, unsigned short), unsigned short, unsigned char, unsigned short, unsigned char) ()
#3 0x00000000004259f0 in main ()
However in other machine it is just printing name of the threads
[root@civ4cez194 bin]# pstack 12672
Thread 7 (Thread 0x7f01892e2700 (LWP 12674)):
Thread 6 (Thread 0x7f0188aa0700 (LWP 12743)):
Thread 5 (Thread 0x7f0188a1e700 (LWP 7090)):
Thread 4 (Thread 0x7f0188a5f700 (LWP 7127)):
Thread 3 (Thread 0x7f01889dd700 (LWP 7178)):
Thread 2 (Thread 0x7f0188ae1700 (LWP 7235)):
Thread 1 (Thread 0x7f0193ca0740 (LWP 12672)):
I have looked for a way to resolve this but haven't had much success. Only significant information I found was here
For thread information to be dumped, you have to use the debug-aware version of the LinuxThreads libpthread.so library.
(To check, run nm(1) on your pthreads library, and
make sure that the symbol "__pthread_threads_debug" is defined.) Threads are not supported with the newer NPTL libpthread.so library.
On doing nm on /lib64/libpthread.so.0 on both the machines, I find "__pthread_debug" for both.
Will appreciate help.
So it turns out there was issue with python installation on the setup due to which backtrace was not working, fixing python installation fixed the problem.