Gdb hangs attaching to process (gdb) info threads You might be questioning how the GDB will work if the system is in a hang state. g. May 24, 2021 · Hello, I am trying to debug my MPI code with mpirun -gdb or mpirun -gtool. It's not really the same as using pdb, but you can do things like py-bt, which is hopefully helpful enough for e. Ok, the PID is 1234. I run the main program in a console and open another console to find the pid of the child process, then I start gdb with the following command: gdb attach 12271 where 12271 is the child process id, but the attach fails with: Aug 14, 2010 · You should interrupt the process that is attached by gdb. The only way to fix it is to kill the gdb process. Aug 1, 2021 · To know the running threads of your process, use the below command. and followed the darwin page to get the keyring set up. Steps to reproduce: Using the following launch config to attach debugger to a p Jan 17, 2013 · I have a simple C program that forks a process and then runs an executable. With procid the id of the process being attached. The code runs normally Oct 28, 2013 · q@mavErick: You don't type gdb), if you run GDB, you get a sort of shell, that, instead of regular bash shell, for example looks like this (gdb) _ where the _ is your cursor, that's where you enter the where or bt commands and the like. 1. This is strange indeed. Feb 22, 2010 · Yes. accessing sources through a no-longer-working NFS/SSHFS mount is one of the most frequent reason for gdb to hang, here :P) What you most likely need to do is to set a breakpoint on main, or some other function of interest, and then use run. (e. After I added the Resources folder and and compile, it hangs on attaching to app-name. When you detach from a process started with gdb, gdb will hang, but killing gdb from another process makes the debugged process still running. Alternatively, launch GDB as super user and attach to processes. d/10-ptrace. I'm able to run the code fine, but when I run it in gdb it prints [New Thread 0x2603 of process 48685] Nov 4, 2013 · As the title says, I'm having issues using LLDB. Every once in a while I'm able to run gdb executable but a majority of the time it hangs right after the r command. If I start gdb up in the background and then manually unsuspend the original process 'kill -CONT <pid>' I get the May 27, 2021 · Hello, I am trying to debug my MPI code with mpirun -gdb or mpirun -gtool. debugging a production process. Attaching to process 30847 Could not attach to process. This is simple. First, while waiting for the breakpoint to be hit (in 'Continuing' mode), I suddenly got back the (gdb) prompt with the message: Continuing. so. I currently use the following script to launch the process: Jul 14, 2017 · When debugging via gdb, spawning a child shell process via popen causes gdb to hang. For example, I use the following command trying to debug my code with -gtool optionmpirun -n 3 -gtool " Jul 21, 2023 · Type: Bug Behaviour Seeing the logs in output when attaching python debugger to a process: Expected vs. I want to attach the child process to gdb. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. All I can say is that strange things have been happening while trying to do the usual set-breakpoint-break-investigate. Mar 18, 2024 · The first tool that we’ll examine is the GNU Debugger or GDB. If the process is already running, you can attach to it provided you know the process ID. I peeped into the proc file system and saw the process to be in sleeping state. The command may take as Attaching to process 18745 gdb just hangs here. 1 on my mac version 10. Let’s figure out the Process ID (PID) of the python process that hang up and attach gdb to the running process. I used pgrep to get the PID of the program foo I executed earlier. 在Linux下，GDB是一款强大的调试工具， attach 指令用于将GDB调试器附加到正在运行的进程上，以便对其进行调试，就好像医生要给一个正在工作的机器检查问题，先得把检测设备连接到机器上一样。 I'm trying to debug a JNI code. I can attach to the process from the host, but I ca Sep 5, 2011 · A multithreaded application hangs and it is not responding to any commands. I've looked into this thread Xcode 4 hangs on attaching to (App name) when debugger is set to LLDB and followed the instructions given because I'm having exactly the same issue, and managed to debug by using GDB - it works flawlessly. For more details, see /etc/sysctl. Interrupt the process by either ctrl-c in the terminal in which the process was started or send the process the SIGINT by kill -2 procid. * On GNU/Linux, GDB can now attach to stopped processes. Check out this link for more information. I have tried following things without luck: Attach a process to gdb (error: (gdb) attach 6026 Attaching to process 6026 ptrace: Operation not permitted. /proc/sysrq-trigger I guess will only give me kernel stack and info,. 1 It only happens with the GDB and GPU combo. Use root@machine to login with a password or certificate. On pressing crt-C to quit the debugging, it says. Mar 3, 2020 · I recently installed gdb 9. 0x7fffe… in ?? from /lib/…/lib_intel_gpu. Actual Debugger can attach to a process successfully. The problem is when I do that gdb hangs at pthread_join() inside If you're comfortable using gdb, there are Python extensions to gdb. Maybe someone else does. I removed Resources folder, still hang. Jan 23, 2012 · Attaching gdb to strace to see what kind of activity is going on during the hang could be a good way to go one step further into figuring out the problem. We attached the GDB I have a long-running process in a docker container to which I would like to attach gdb to look at what threads are running and get stacktraces. $ gdb -ex r --args python <programname>. Several race conditions handling signals delivered during attach or thread creation have also been fixed. This command attaches to another target, of the same type as your last "target" command ("info files" will show your target stack). $ pgrep -f "python -m foo" 1234. so , producing the following output. I removed the project and recreate a new one ( with the same name ) but still having problem. Typing help attach at a GDB console gives the following: (gdb) help attach Attach to a process or file outside of GDB. Do not interrupt gdb itself. Use the attach command. Oct 26, 2022 · [New Thread 0x7fffe… ] intelgt: gdbserver-gt started for process 364 Will listen for an attached process SYCL: Using device: [Intel(R) … ] The GDB gets stuck at this point. If it was different name then it's ok. 0. py <arguments> This will run the program til it exits, segfaults or you manually stop execution (using Ctrl+C). This post exhibits the same problem I am having with a minimum repro (I am not the author of the post Dec 8, 2020 · Now it is time to play. I tried to gdb <binary_name> <pid>, but the gdb prompt was just stuck, and did not proceed to attach to the process. Now let’s attach gdb as described in the official manual page: All of the above suggestion didn't resolve my problem. By default, GDB follows the parent after a call to fork(). This will make gdb stop at the breakpoint and prompt you for what to do next. We can use GDB to obtain a stack trace of the program. Feb 12, 2019 · You can specify a variety of ways to connect to the server (serial ports, IP addresses…), and either run a command to debug, or attach to a running process, or even run a “debugging server” with no specific process. For this purpose I'm following an idea about attaching gdb to the java process running my Java code. Actually, a stack trace is a snapshot of the function call sequence. Anyway, i'm working in a team and I'm the only one who's Nov 12, 2013 · To debug it I tried attaching the process to gdb, but the gdb hangs. ) gstack (gstack just hangs like that) Jul 11, 2013 · I can't start the process from outside of gdb as I need to modify the memory, before the first instruction is executed. Please try a recent snapshot or cvs checkout. The problem is when I do that gdb hangs at pthread_join() inside libjli. I don't know if there's a pdb-like debugger to attach to an existing process. Can you try attaching strace to your process? Running strace -p <PID> might do the trick. Also, what happens when you hit CTRL-C after you run gdb -p PID? Feb 18, 2020 · There are three ways to workaround this: This will set the ptrace level to 0, after this just with user permissions you can attach to processes which are not launched by the debugger. gstack also gets hanged. conf ptrace: Operation not permitted. $ gdb python <pid of running process> Attaching to a running process like this will cause it to stop Nov 16, 2013 · I am attaching gdb to a multi-threaded c++ server process. On the host with your development environment, you connect to the target within gdb: $ gdb Nov 27, 2023 · Process reaches a deadlock state, presumably because a lock or some other resource that; Because of this coredump for the process is never generated, at the other threads keep running in a kind of infinite loop, due to this deadlock. When GDB debugs a program that calls the fork() function to create a new child process, GDB can be set to follow (to debug) either the parent process or the child process, leaving the execution of the other process unaffected by GDB. Either way, after typing in the command, nothing comes up and the terminal just freezes unless terminated using Ctrl+c. vhdy seyjx kctmjat iqcaqz qzjzn dhslz xzliax hnrlc dupkv gmoipqn casrgs xklyth myfcf oju wla