How check if process is stuck Linux?

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You can run “strace -p ” command to check if the process is hung or not. If it is running it would issue system calls and based on what system call you can also determine if it is waiting for some IO or trying to read/write a file or waiting for some other child process.

How do I know if a process is stuck Linux?

4 Answers

run ps to find list of PIDs of the watched processes (along with exec time, etc)
loop over the PIDs.
start gdb attaching to the process using its PID, dumping stack trace from it using thread apply all where , detaching from the process.
a process was declared hung if:

How do you kill a hung process in Linux?

How to force kill process in Linux

Use pidof command to find the process ID of a running program or app. pidoff appname.
To kill process in Linux with PID: kill -9 pid.
To kill process in Linux with application name: killall -9 appname.

How do you debug a stuck process?

To install and use Debugging Tool for Windows

Run the program that is freezing or hanging, and that you wish to debug.
Run the Debugging Tool for Windows. …
Click on the File menu, and select Attach to a Process. …
Find the process for the program which you wish to debug. …
The command window should automatically open.

How do I debug a Linux process?

Attaching an Already Running GDB to an Already Running Process

Use the shell GDB command to run the ps command and find the program’s process id (pid): (gdb) shell ps -C program -o pid h pid. Replace program with a file name or path to the program.
Use the attach command to attach GDB to the program: (gdb) attach pid.

How do you check for hung threads in Unix?

Using the top command

The top command can show a real-time view of individual threads. To enable thread views in the top output, invoke top with “-H” option. This will list all Linux threads. You can also toggle on or off thread view mode while top is running, by pressing ‘H’ key.

What is kill 9 in Linux?

kill –9 Meaning: The process will be killed by the kernel; this signal cannot be ignored. 9 means KILL signal that is not catchable or ignorable. Uses: SIGKILL singal. Kill Meaning: The kill command without any signal passes the signal 15, which terminates the process the normal way.

How do you kill a process in Unix?

Control sequences. The most obvious way to kill a process is probably to type Ctrl-C. This assumes, of course, that you’ve just started running it and that you’re still on the command line with the process running in the foreground. There are other control sequence options as well.

What is Ruby process?

One way to allow for true parallelism in Ruby is to use multiple Processes . A Ruby Process is the instance of an application or a forked copy. In a traditional Rails application, each Process contains all the build up, initialization, and resource allocation the app will need.

What is gstack in Linux?

gstack(1) – Linux man page

gstack attaches to the active process named by the pid on the command line, and prints out an execution stack trace. … If the process is part of a thread group, then gstack will print out a stack trace for each of the threads in the group.

How do I capture a Pstack?

To get the pstack and gcore, here is the procedure:

Get the process ID of the suspect process: # ps -eaf | grep -i suspect_process.
Use the process ID to generate the gcore: # gcore <proc_id> …
Now generate the pstack based on the generated gcore file: …
Now create a compressed tar ball with the gcore.

What is gdb in Linux?

gdb is the acronym for GNU Debugger. This tool helps to debug the programs written in C, C++, Ada, Fortran, etc. The console can be opened using the gdb command on terminal.

What is gdb process in Linux?

The purpose of a debugger such as GDB is to allow you to see what is going on “inside” another program while it executes — or what another program was doing at the moment it crashed. … You can use GDB to debug programs written in C, C++, Fortran and Modula-2. GDB is invoked with the shell command “gdb”.