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What should I do if kill-9 does not work?
kill -9 ( SIGKILL) always works, provided you have the permission to kill the process. Basically either the process must be started by you and not be setuid or setgid, or you must be root. There is one exception: even root cannot send a fatal signal to PID 1 (the init process). However kill -9 is not guaranteed to work immediately.
What’s the difference between kill and kill 9?
Kill actually means send a signal. there are multiple signals you can send. kill -9 is a special signal. When sending a signal the application deals with it. if not the kernel deals with it. so you can trap a signal in your application. But I said kill -9 was special.
Is it safe to use kill-9 on node processes?
This only goes for the server process of course, you can kill your node processes any way you want from mongo’s perspective. However, in general you should avoid using kill -9 to kill any process, for the same reasons outlined above. Processes that can’t clean up tend to leave a mess behind.
Can a process block a SIGKILL call?
Normally, processes cannot block SIGKILL. But kernel code can, and processes execute kernel code when they call system calls. Kernel code blocks all signals when interrupting the system call would result in a badly formed data structure somewhere in the kernel, or more generally in some kernel invariant being violated.
When do you use the kill ( 9 ) switch?
The TERM signal will kill processes which do not catch this signal. For other processes, it may be necessary to use the KILL ( 9) signal, since this signal cannot be caught. Therefore, using the -9 switch ensures that the process is effectively killed.
How does kill work in Microsoft SQL Server?
The process takes longer to complete particularly when the process involves rolling back a long transaction. KILL ends a normal connection, which internally stops the transactions that are associated with the specified session ID. At times, Microsoft Distributed Transaction Coordinator (MS DTC) might be in use.
What happens if a system call kills a process?
So if (due to a bug or misdesign) a system call blocks indefinitely, there may effectively be no way to kill the process. (But the process will be killed if it ever completes the system call.) A process blocked in a system call is in uninterruptible sleep.
When do you need to kill a process in Linux?
If a Linux process becomes unresponsive or is consuming too many resources, you may need to kill it. Most processes have their own methods of shutting down. Unfortunately, processes can malfunction and not allow themselves to be shut down. If a running background process is unresponsive, it becomes necessary to use a command to kill it.
Why does SQL Server kill statement take so long?
Ends a user process that is based on the session ID or unit of work (UOW). If the specified session ID or UOW has much work to undo, the KILL statement may take some time to complete. The process takes longer to complete particularly when the process involves rolling back a long transaction.