pstack
Command
The pstack
command displays a stack trace for each process. The pstack
command must be run by the owner of the process or by root
. You can use the pstack
command to determine where a process is hung. The only argument that needs to be provided is the ID of the process that you want to check or the name of a core file. For more information about the pstack
command, see the
proc
(1) man page.
Example 6-2 Displaying Stack Trace for NFS Process
# /usr/bin/pgrep nfsd 243 # /usr/bin/pstack 243 243: /usr/lib/nfs/nfsd -a 16 ef675c04 poll (24d50, 2, ffffffff) 000115dc ???????? (24000, 132c4, 276d8, 1329c, 276d8, 0) 00011390 main (3, efffff14, 0, 0, ffffffff, 400) + 3c8 00010fb0 _start (0, 0, 0, 0, 0, 0) + 5c
The example shows that the process is waiting for a new connection request, which is a normal response. If the stack shows that the process is still in poll after a request is made, the process might be hung. For more information about fixing a hung process, see How to Restart NFS Service. For more information about troubleshooting NFS, see NFS Troubleshooting Procedures.