04-22-2019
You can check to see what is the parent process, and if possible you can kill or restart the parent process (as long as the parent process is not the root process).
In the case of remote mounts causing the D state, you can check the parent networking process and decide how to proceed.
Some people have tried to be creative as follows:
- Determine the zombie & parent PIDs. (in this example let's say the zombie's PID 3200 and the parent's PID 3100)
- Start gdb and attach to the parent in this example , attach 3200
- Call waitpid for the zombie process:, for example call waitpid(3100,0,0)
- Detach from the parent (detach) and exit the debugger.
Update: Fixed typos (I think!)
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EXIT(2) BSD System Calls Manual EXIT(2)
NAME
_exit -- terminate the calling process
SYNOPSIS
#include <unistd.h>
void
_exit(int status);
DESCRIPTION
The _exit() function terminates a process, with the following consequences:
o All of the descriptors that were open in the calling process are closed. This may entail delays; for example, waiting for output to
drain. A process in this state may not be killed, as it is already dying.
o If the parent process of the calling process has an outstanding wait call or catches the SIGCHLD signal, it is notified of the calling
process's termination; the status is set as defined by wait(2).
o The parent process-ID of all of the calling process's existing child processes are set to 1; the initialization process (see the DEFINI-
TIONS section of intro(2)) inherits each of these processes.
o If the termination of the process causes any process group to become orphaned (usually because the parents of all members of the group
have now exited; see ``orphaned process group'' in intro(2)), and if any member of the orphaned group is stopped, the SIGHUP signal and
the SIGCONT signal are sent to all members of the newly-orphaned process group.
o If the process is a controlling process (see intro(2)), the SIGHUP signal is sent to the foreground process group of the controlling ter-
minal. All current access to the controlling terminal is revoked.
Most C programs call the library routine exit(3), which flushes buffers, closes streams, unlinks temporary files, etc., before calling
_exit().
RETURN VALUE
_exit() can never return.
SEE ALSO
fork(2), sigaction(2), wait(2), exit(3)
STANDARDS
The _exit function is defined by IEEE Std 1003.1-1988 (``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution