I'm facing a small problem with gdb and separate debuginfo's. Do you build with the '-g' compiler option?
[root@XXXX2 nginx]# rpm -qa | grep nginx
nginx-1.4.4-1.el6.ngx.x86_64
nginx-debug-1.4.4-1.el6.ngx.x86_64
[root@XXXX2 nginx]# gdb --pid 39019
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
http://www.gnu.org/software/gdb/bugs/.
Attaching to process 39019
Reading symbols from /usr/sbin/nginx...
warning: the debug information found in "/usr/sbin/nginx.debug" does not match "/usr/sbin/nginx" (CRC mismatch).
(no debugging symbols found)...done.
Reading symbols from /lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/lib64/libpthread-2.12.so.debug...done.
[Thread debugging using libthread_db enabled]
done.
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libcrypt.so.1...Reading symbols from /usr/lib/debug/lib64/libcrypt-2.12.so.debug...done.
done.
Loaded symbols for /lib64/libcrypt.so.1
Reading symbols from /lib64/libpcre.so.0...Reading symbols from /usr/lib/debug/lib64/libpcre.so.0.0.1.debug...done.
done.
Loaded symbols for /lib64/libpcre.so.0
Reading symbols from /usr/lib64/libssl.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libssl.so.1.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libssl.so.10
Reading symbols from /usr/lib64/libcrypto.so.10...Reading symbols from /usr/lib/debug/usr/lib64/libcrypto.so.1.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libcrypto.so.10
Reading symbols from /lib64/libdl.so.2...Reading symbols from /usr/lib/debug/lib64/libdl-2.12.so.debug...done.
done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libz.so.1...Reading symbols from /usr/lib/debug/lib64/libz.so.1.2.3.debug...done.
done.
Loaded symbols for /lib64/libz.so.1
Reading symbols from /lib64/libc.so.6...Reading symbols from /usr/lib/debug/lib64/libc-2.12.so.debug...done.
done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.12.so.debug...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libfreebl3.so...Reading symbols from /usr/lib/debug/lib64/libfreebl3.so.debug...done.
done.
Loaded symbols for /lib64/libfreebl3.so
Reading symbols from /lib64/libgssapi_krb5.so.2...Reading symbols from /usr/lib/debug/lib64/libgssapi_krb5.so.2.2.debug...done.
done.
Loaded symbols for /lib64/libgssapi_krb5.so.2
Reading symbols from /lib64/libkrb5.so.3...Reading symbols from /usr/lib/debug/lib64/libkrb5.so.3.3.debug...done.
done.
Loaded symbols for /lib64/libkrb5.so.3
Reading symbols from /lib64/libcom_err.so.2...Reading symbols from /usr/lib/debug/lib64/libcom_err.so.2.1.debug...done.
done.
Loaded symbols for /lib64/libcom_err.so.2
Reading symbols from /lib64/libk5crypto.so.3...Reading symbols from /usr/lib/debug/lib64/libk5crypto.so.3.1.debug...done.
done.
Loaded symbols for /lib64/libk5crypto.so.3
Reading symbols from /lib64/libkrb5support.so.0...Reading symbols from /usr/lib/debug/lib64/libkrb5support.so.0.1.debug...done.
done.
Loaded symbols for /lib64/libkrb5support.so.0
Reading symbols from /lib64/libkeyutils.so.1...Reading symbols from /usr/lib/debug/lib64/libkeyutils.so.1.3.debug...done.
done.
Loaded symbols for /lib64/libkeyutils.so.1
Reading symbols from /lib64/libresolv.so.2...Reading symbols from /usr/lib/debug/lib64/libresolv-2.12.so.debug...done.
done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /lib64/libselinux.so.1...Reading symbols from /usr/lib/debug/lib64/libselinux.so.1.debug...done.
done.
Loaded symbols for /lib64/libselinux.so.1
Reading symbols from /lib64/libnss_files.so.2...Reading symbols from /usr/lib/debug/lib64/libnss_files-2.12.so.debug...done.
done.
Loaded symbols for /lib64/libnss_files.so.2
Reading symbols from /lib64/libnss_sss.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/libnss_sss.so.2
0x00007ffa45a45f23 in __epoll_wait_nocancel () at ../sysdeps/unix/syscall-template.S:82
82 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
Missing separate debuginfos, use: debuginfo-install nginx-1.4.4-1.el6.ngx.x86_64
