Gdb step back from segfault. Instead of re-running the program, is it possible ...

Gdb step back from segfault. Instead of re-running the program, is it possible to switch to a previous stack frame and continue execution from there? On Unix and Linux systems, at least, you can use gdb's handle command to tell gdb to stop the program when a signal is received (with the stop keyword) and not to pass the signal Yes, you can do it with reverse debugging. If it knew, it would print something like "0x00008f0c in foobar ()". You can step through your code line-by-line, view call stacks, view assembly, and most importantly— find the source of a bug! If you haven’t used a Getting gdb and debug symbols To get a backtrace, install the gdb package, as well as the -dbg subpackages for the app and the libraries it uses. $ gcc -g Program1. Here is an example: gdb your_program (gdb) run When your program crashes with the segmentation fault, you can inspect the problem with the Usually, gdb or lldb can give a good hint about what is the problem. This is a quick Written by Chris Gregg and Nate Hardison, with modifications by Nick Troccoli and Lisa Yan Click here for a walkthrough video. (gdb) step the program is not being run (gdb) run program exited normally How do I Handy script. I think the missing extension is the gdb integration to put breakpoints in python code directly and watch python variables. 0 (due September 2009) will be the first public release of gdb to support reverse debugging (the ability to make the program being debugged step and continue in The problem is, that if I run the program without GDB, I clearly see the segmentation fault, and the program is killed. Or just debugging in general, how do you like to go about finding bugs in code. It will stop on a breakpoint set in the shared library but I cannot list the source line and I cannot view any variables local to the class / Step 1: Cause the segfault inside GDB. i is 0. Use file and pass it your application's binary file in the console. Most of the time the problem lies not at the line the fault happens, but Learn how to stop segfaults fast with our practical guide on GDB, LLDB, and core dump analysis. If I run a program from the shell, and it segfaults: $ buggy_program Segmentation fault It will tell me, however, is there a way to get programs to print a backtrace, perhaps by running Beginning with the 7. /program core And gdb will load and you can run a backtrace to see exactly what operation elicited the segfault. To do this: Edit the file . A target environment that supports reverse execution should be Is there a way to jump immediately to that breakpoint without using "next" or "step"? Using "next" or "step", it takes really long to get to the final breakpoint. tests. In addition to help, you can use the GDB commands info and show to inquire about the The more efficient solution will be to run the program under the debugger, and step over functions until the program crashes. Use run and pass in any arguments your application needs to start. Thanks @ssbssa for Use a debugger, such as gdb or if this is not applicable a strace tool to get a better insight into where the segfault occurs. I try to use the backtrace command of the gdb to find the bug, but unfortunately, I do not understand its output: (gdb) bt #0 0x00007ffff1678480 in ?? () from /us The until command appeared to step back to the beginning of the loop when it advanced to this expression; however, it has not really gone to an earlier statement--not in terms of the actual Next, use gdb to get a stack trace: bash$ gdb cc1 gdb> run arguments (cc1 will stop at the segmentation fault) gdb> where gdb> list Print out the values of interesting variables, e. This tutorial will show you how to use gdb's up function to find the cause of segmentation faults. It starts with a command name, which is followed by arguments whose meaning I am trying to debug a C program and gdb is telling me there is a segfault on line 329 of a certain function. Compile and run the source code from the skeleton With GDB 7 and higher, you can examine the $_siginfo structure that is filled out when the signal occurs, and determine the faulting address: Basically, I'm practicing a buffer overflow, and I'm getting this weird segfault only when the program I'm testing is run with gdb: This is what the Head our to your terminal (Be in the directory in which this Program1. h> #include GDB Tutorial # GDB is like a swiss-army knife to a C/C++ developer. Consider the following C++ code (segfault. If the previous source line included calls to A debugger is software that runs your code and examines any problems it finds. This means that we tried to access an invalid memory address. So I need the gdb, which is installed. Break/watch the line number in the named source file. gef. I put a breakpoint in an Assembly program in I have been trying to debug a segfault with gdb, but it shows error occurs in "?? ()" step which I can't figure out the meaning. So i tried using the GDB debugger to see where the fault is occurring,but GDB Quick Start Guide GDB (GNU debugger) can pause the execution of a running program and let you examine/take control of its memory. This tutorial assumes that you have a basic knowledge of pointers such as can be acquired by reading a pointer tutorial. c, line 18. Debugging with GDB Like the step command, reverse-step will only stop at the beginning of a source line. It allows you to: Run your program until it crashes Examine Inside GDB, your program may stop for any of several reasons, such as a signal, a breakpoint, or reaching a new line after a GDB command such as step. For the sample code, just type "run" and hit enter at the GDB prompt: gef run Your program should halt when Hello everyone, I have a freshly installed Arch Linux on my computer that I use for development. 1 LTS), but whenever I try the run command it always gives a segmentation fault, regardless of the program being debugged. See Recently, I started having troubles debugging my product with GDB. Learn how to automate debugging by repeatedly running programs until errors occur using GDB or LLDB debuggers. c file located in the guides/segfault/support directory. Once the execution is paused one a line, one can execute the current line and step into the next line using step command. /segfault Make the code cause the segfault. Compile and run the source code from the skeleton GDB now has reverse debugging, it was introduced in September and most IDE's still don't support it. Once a crashing function is identified, start again and step into that function Move n frames down the stack. mytest, then the -m switch confuses gdb. cpp is available) Step 1: Compile it. I typed help while I was in the GDB but didn't find anything about step-into, step-over and step-out. ) that is installed on all of Stanford's UNIX The set step-mode on command causes the step command to stop at the first instruction of a function which contains no debug line information rather than stepping over it. Once halted, we need to continue execution a GDB can not determine what function address 0x8f0c belongs to, therefor it shows 0x00008f0c in ?? (). From the beginning of GDB, entering ‘layout next’ once the program is running will show you source code around your current location in the program. You can step through your code line-by-line, view call stacks, view assembly, and most importantly— find the source of a bug! If you We recently discovered that we would very sporadically get a segmentation fault when running the whol Tagged with gdb, debugging, 3 How I can run a program in C++ with GDB so that in case of error exception (segfaults) restarted the program (I want that GDB automatically use "run" command), and at the same time any Things are even worse now—we got a segmentation fault. You may then examine and change Debugging with GDB Like the step command, reverse-step will only stop at the beginning of a source line. So I set a break point for that function and I am trying to step through it. In contrast, stepping means executing just one more “step” of your program, where “step” may mean either one GDB will perform all execution commands in reverse, until the exec-direction mode is changed to “forward”. To display the backtrace for several or all of the threads, use the command GDB Beginner Masterclass: • GDB Beginner Masterclass Find full courses on: https://courses. e. The return To step into, step over, and step out with GDB, use the “step”, “next”, and “finish” commands. Every time an exception 14 (page fault) is thrown gdb breaks on the handler for the exception. However, if I try to backtrace a segfault, or some I have a segfault in my program. In particular, we can switch between threads, inspect the stack, and dump the registers. You can use the up and down arrows to go back and Those who use Visual Studio will be familiar with the Shift + F11 hotkey, which steps out of a function, meaning it continues execution of the We would like to show you a description here but the site won’t allow us. If this were a program, not a shared library Command Syntax (Debugging with GDB) A GDB command is a single line of input. In CS106A and CS106B, you may have used a For my own knowledge for the future, given that gdb doesn't work, are there other ways to debug this sort of thing so I can precisely locate where the segfault is occurring? Thank you for Removing the assignment pushes the segfault to line 800, and removing that assignment causes some other assignment in the if-block to segfault. If you are getting a segfault you can 0x0000000000400850 in fail () at debugging_with_gdb. cpp (in my case). A backtrace would really be So, my question is, how can gdb and the kernel message agree on the type of fault, and on the offset of the instruction relative to the base address of the shared library, but disagree on the A GDB tutorial using simple steps and examples-great for beginners or as a reference. There is no limit on how long it can be. mshah. gdb Reference Card. The difference between these two is that if the line to be executed is a function call, Step 2: Use GDB to analyze the core dump GDB (GNU Debugger) is a powerful tool for debugging programs. This information is instrumental in I have a command line application that when run does not do what it is supposed to do and at a certain point leaves the message: Segmentation fault What does this mean? What should I do? Segmentation fault (core dumped) Next, we‘ll use GDB to pinpoint the exact line causing this crash. Anyone can give a hint what that means? Use gdb to open the gdb console. sources, then use gdb command source to set the variable: 2. To resume execution at a different place, you can use return (see Returning from a Function) to go back to the calling function; or jump (see Continuing at a Different Address) to go to an arbitrary location in GDB normally ignores breakpoints when it resumes execution, until at least one instruction has been executed. I compiled my program with -g and now I want to step through it. n defaults to one. In CS106A and CS106B, you may have used a I have a program which is segfaulting at a specific line: uint64_t smaller_num = * (uint64_t*) (smaller_base+index); GDB successfully catches the segfault allowing me to debug the You can single-step through the C source using the next (shorthand: n) or step (shorthand: s) commands, both of which execute a line and stop. most programs), it is helpful to inspect the variables of all functions in the current call stack, i. The process halted and we were able to do everything that we would've been able to do had we started the This is equivalent to the "step over" command of most debuggers. To step over, use the ni instruction. TL;DR Updated on: Aug 8 2025 There are plenty of online resources covering the basics of GDB, so I won’t include that here. 001) immediately after the For C and C++ developers, few tools inspire equal parts excitement and apprehension as the GNU Debugger. If you'd like more information on GDB, please visit: https://www. Do something to cause Introduction Breakpoints halt execution at the point specified, however the specified point is usually only our best guess as to where the problem might be. The difference between these two is that if the line In my application, I handle SIGSEG to produce a backtrace and call abort() to generate a core dump. You may Debugging The following are some very valuable tools for debugging. cc:11 11 std::cout << *p2 << std::endl; We see the segmentation fault is happening at line 11. Spend a few hours to learn one so you can avoid dozens of hours of frustration in the future. The return rr version 5. Except the callq address is not dynamically loaded from a register or from memory - it's I was trying to play around with gdb, and I'm especially interest in seeing how the Procedural Linkage Table (PLT) and the Global Offset Table $ gdb . g. Let's take a Generating a backtrace when debugging a segmentation fault (also known as a segfault or SIGSEGV) is very useful, as it can help pinpoint the location of the bug. To debug a segfault, using a debugger like GDB, LLDB, or Visual Studio Debugger is essential. First thing to do when having a core dump file is 'bt full' which will give you the complete call stack at the time the segfault happens. This note is a work in GDB is an essential tool for programmers to debug their code. This is the code that I Continuing means resuming program execution until your program completes normally. GNU Debugger (GBD) is one of the most popular debuggers, Written by Chris Gregg and Nate Hardison, with modifications by Nick Troccoli and Lisa Yan Click here for a walkthrough video. Can you go back in time? Some debuggers support reverse debugging, i. I tried to dive into the issue using gdb, but it The next step is to open the core file with gdb and get a backtrace. The complete source code can be found here: Guide: GDB Tutorial - Debugging a Segfault To follow this guide, you'll need to use the segfault. to act as if it's hit a break; statement. But in your particular case, next may not be what you want, and I Backtrace (Debugging with GDB) In a multi-threaded program, GDB by default shows the backtrace only for the current thread. 0 release in September 2009, gdb now includes support for a whole new way of debugging called "reverse debugging" -- meaning that gdb can allow you to "step" or "continue" your Afterall, in this example, we did go back in a python program. Step 3: Inspect variables and values $ gdb myprog (gdb) run --arg1 --arg2 GDB will run the program as normal, when the segmentation fault occurs GDB will drop back to its prompt and it will be almost the same as running A Beginner’s Guide to GDB: The GNU Debugger Introduction Debugging is an essential skill for any software developer, and when it comes to Introduction In order to debug programs with functions (i. I've been trying to find the cause of this nasty Apparently it is possible to have GDB intercept signals if you run a GDB command first: Continue debugging after SegFault in GDB? - handle SIGSEGV stop nopass. (gdb) break +3 Breakpoint 3 at 0x8048450: file try5. 6. Start your program or connect to an already-running program. Affected commands include step, stepi, next, nexti, continue, and finish. rc in your home directory (nano While GDB is the gold standard, a few other tools are worth mentioning: Reverse Debugging – Some debuggers like GDB allow stepping backwards from a crash to replay events. These GDB commands quickly identify and fix bugs in the program. I tried putting a breakpoint next to the next command: b *0x7d21 c But it never returns Should I perhaps have set the breakpoint on a different Stepping commands in GDB 1. , the GDB will perform all execution commands in reverse, until the exec-direction mode is changed to “forward”. My code is written in C++11 with extensive use of meta Step 1: Cause the segfault inside GDB. I don't think unwinding is that complex, and cdecl stackframes are not that difficult to make. If there 12 Instead of choosing to "step", you can use the "until" command to usually behave in the way that you desire: (gdb) until foo I don't know of any way to permanently configure gdb to skip This article provides a quick tutorial, explaining how to use GDB's reverse debugging facility, also known as time travel debugging. This probably GDB Cheat Sheet By Spencer Davis GDB is a debugging program that will save your life in this class and beyond. If it did not do this, you would be unable to proceed past a breakpoint without first disabling Sometimes GDB will exit/crash when it tries to show you segmentation fault context. It's probably one of the most powerful tools that can help Use the right compiler switches Useful GDB commands gdb –args Stop GDB at the first line of main () Command: until Command: ignore I'm using gdb with bochs-gdb to debug a virtual memory implementation I am writing. Breakpoint 3, display (x=5) at A common problem is that people may come back later to make changes "borrow" a function for quick use in another feature of the program or another solution and miss that fact and I learned about GDB for debugging for the first time today and used backtrace full to try and source the error, but I'm not totally sure how to interpret what it gave me. GDB has now started your program, and it stopped on the breakpoint we set earlier. Step 2: Find the function call that caused the problem. Program received signal SIGSEGV, Segmentation fault. gnu. This file aims to make it more accessible for I am encountering a crash in cuda-gdb that makes it impossible for me to debug my CUDA kernels. In CS106A and CS106B, you may have used a 4 I'm trying to find the reason for a segfault which is occurring on the level of system libraries. I'll be using a c++ program I wrote as an example. This view can be helpful to those who are new to GDB assigns numbers to all existing stack frames, starting with zero for the innermost frame, one for the frame that called it, and so on upward. Perfect for developers looking to master memory debugging. , when your application is halted at a breakpoint, you can actually take a step backward in the execution. It's part of the GNU package, which contains free software (the gcc compiler, emacs, etc. The philosophy is that Can you step back in GDB? If the target environment supports it, gdb can allow you to “rewind” the program by running it backward. GDB provides unprecedented runtime Segmentation faults in C++ are a sign that you are trying to do hard things. You can stop your program at any time by sending it signals. However, You can execute the backtrace command using the GDB Session window in Visual Studio. file <exe> set pagination off set breakpoint pending on break exit commands run end run Run it using: gdb -x <script> I don't want to step into, but to step over. I found the root of the problem, but not yet a workaround. This is in Linux 2. Step 2: Run it. Normally this is done using Control aspects of the environment that your program will run in. When I run it with gdb, no fault is shown. 1. Specifically for C/C++, but all languages in general. For positive numbers n, this advances toward the innermost frame, to lower frame numbers, to frames that were created more recently. hit run watch the Can you step back in GDB? If the target environment supports it, gdb can allow you to “rewind” the program by running it backward. You will stop in the previous frame where you are about to call the You will notice that GDB hangs at scanf, so input a value for n and continue stepping through. If you want gdb to resume normal execution, type "continue" or "c". 'reverse-step [COUNT]' Run the program backward until control reaches the start of a different source line; then stop it, and return . This guide is mostly for the special case where you are sure that the line reported is not the cause of the segfault. I would like get some hints on how to use gdb to examine args of the getenv() call seen in I'm trying to use gdb (Ubuntu 12. There This is a segfault due to following a null pointer trying to find code to run (that is, during an instruction fetch). 2 on a 32-bit x86 (Athlon 64, if it should matter). $ . At some some point, this To get started with gdb, short examples are good. But when I'm running GDB it just halts, and GDB never returns to the prompt. Congratulations!Now, let’s take a peek at how to start debugging. 04. io/ Join as member to get perks: / @mikeshah Lesson Description: In this lesson I show you how to Another useful tool is gdb, the GNU Project Debugger. It “un-executes” the previously executed source line. 2 Example Debugging Session: Segmentation Fault Example We are going to use gdb to figure out why the following program causes a segmentation fault. (gdb) continue Continuing. /a. Not just that: GDB can't even read the arguments that were passed, so there is Forgive me if this is a duplicate - but I can't seem to find any straightforward advice on this. Step 3: Inspect variables and values until you find a bad Using GDB (GNU Debugger) GDB is a powerful tool for debugging segmentation faults. module. gdb will run until your program ends, your program crashes, or gdb With GDB, you step through logic and memory; with strace, you observe your program’s interaction with the operating system. For example, let’s go to a (gdb) break my_function (gdb) cont This will insert a breakpoint at the beginning of my_function, so when execution of the program enters the function the program will be suspended Written by Chris Gregg and Nate Hardison, with modifications by Nick Troccoli and Lisa Yan Click here for a walkthrough video. Alternatively you can use the Call Stack window that shows the same information in the user-friendly way. cu): #include <cuda_runtime. In CS106A and CS106B, you may have used a GDB is a powerful debugger. It's definitely valuable to spend some time getting Now use gdb command shell to parse the file with regular Unix tool (grep / sed) and reformat it into /tmp/gdbFile. This will show In one of my C++-projects I found an issue related to a linked library which results in a segfault directly after starting the compiled executable. So the only variable being used at this line is pointer Continuing and Stepping (Debugging with GDB) A typical technique for using stepping is to set a breakpoint (see Breakpoints; Watchpoints; and Catchpoints) at the beginning of the function or the Tracking down segfaults is frustrating! But have no fear – with the right tools and techniques, you can squash them and get back to coding. This comprehensive guide will teach you GDB is like a swiss-army knife to a C/C++ developer. These numbers do not really exist in your program; they are One more thing I noticed was when I put “watch * (double*)0x7fffffffd2c8” which was the address of variable “dt” in gdb, its value was changed (should have been 0. I can tell GDB to return from a function immediately with return, and call a function with call myFunction. the (gdb) reverse-step Target child does not support this command. A target environment that supports reverse execution should be I'm doing an assignment that is working with shared memory, and i'm getting segfaults whenever I run the code. Without a doubt, we can debug multi-threaded programs with gdb. Is Behavior of asynchronous signals depends on the target environment. Step 3: Inspect variables and values until you find a bad I have a multithreaded C program, which consistently generates a segmentation fault at a specific point in the program. Once you know how to run it (gdb nameOfProgram), how to examine and traverse the stack (bt, up, down), see the code you're currently in (list) and how Written by Chris Gregg and Nate Hardison, with modifications by Nick Troccoli and Lisa Yan Click here for a walkthrough video. Getting a backtrace from gdb You can open a core file with gdb like this: $ gdb -c my_core_file or maybe $ gdb I hope you're impressed by this! We attached GDB to a process that was already running. The issue here was due to a change in upstream gdb 12. It looks as though either accessing an Table of Contents Fundamental Concepts of Linux Segfault Detecting Segmentation Faults Common Causes of Segmentation Faults Debugging Segmentation Faults Best Practices to Instead, it scrambles values of other stored data which in turn ends up finally in a segmentation fault (much later). Step through your program one To use GDB, you can compile your program with the -g flag to include debugging symbols, then run the program under GDB's control. You can use it to analyze the core Overview GDB version 7. 7. Step-by-Step SegFault Diagnosis with GDB GDB is your best friend when tracking down segfaults. These numbers do not really exist in your program; they are Run the program with input and output files. Please show your code, concentrate on the minimal code that causes the segfault. If you use gcc, make sure you compile with -g switch to include Segfault: and the disassembly is different between objdump and gdb Asked 11 years, 8 months ago Modified 10 years, 11 months ago Viewed 968 times GDB assigns numbers to all existing stack frames, starting with zero for the innermost frame, one for the frame that called it, and so on upward. Inside GDB, your program may stop for any of several reasons, such as a signal, a breakpoint, or reaching a new line after a GDB command such as step. It could be useful for debugging this issue if it happens again, you could attach the If a segmentation fault occurs, GDB will provide the line number and function where the segfault happened. 5. gdb also remembers your A debugger is software that runs your code and examines any problems it finds. How do I watch the execution of my program? Gdb functions somewhat like an interpreter for your programs. GDB does not step into any function within the shared library. Invoke using the --args option thusly: gdb With a command name as help argument, GDB displays a short paragraph on how to use that command. Reinstalling gdb might help, but I wouldn't hold much hope of that solving the problem, unless you change the version of gdb you install, gdb itself is a pretty easy program to install, so pretty hard to Well, I tried it with gdb in the segfault_userspace handler and it follows the stack without issue. So, to add to the above hints: Use the debugger to check your app How to Use GDB to Debug a Real C Bug Step by Step A clean beginner-friendly guide to segmentation faults, backtraces, breakpoints, and variable inspection using one realistic example Let's set a breakpoint at line 18 and continue the execution. Others might learn more from your actual mistake (as in what your code does wrong), then how you By leveraging GDB and core dumps, you can efficiently identify and resolve segmentation faults, ensuring more robust and reliable C programs. Breakpoints are the way to tell GDB to stop or pause the program execution at certain line, or function, or address. It A segmentation fault has to do access to memory locations By memory locations, we mean the computer's short-term memory, or RAM (Random Access Memory) This is the place where all Segmentation faults in C/C++ can be frustrating! This guide provides a step-by-step approach to debugging these errors. If you have entered a large value for n and want to skip the iteration, use the continue command. org/software/gdb/ You can single-step through the C source using the next or step commands, both of which execute a line and stop. Here's an example of how To use gdb to diagnose a segfault, follow these steps: First, compile your program with the `-g` flag, which instructs the compiler to collect comprehensive debugging information. So we received the SIGSEGV signal from the operating system. You can set these breakpoints Time travel debugging (also sometimes called reversible debugging) is a handy feature of some debuggers that allows you to step back through the In this video, we'll use GDB in combination with segfaults. An example segfault-causing file can be found here. If I now run a gdb-post-mortem analysis of the core, the thread which caused the GDB is a powerful debugger for C, along with many other languages. If the previous source line included calls to That is often not possible in GDB, but you can go back in history easily using a debugger called QIRA . The program is meant to read in a line of Guide: GDB Tutorial - Debugging a Segfault To follow this guide, you’ll need to use the segfault. Can you think of any reason To step in, use the si instruction. c Load the file in gdb gdb . 4. These tools help identify the specific line of code Hi, The tutorials for gdb are all extremely complicated. 0 gdb 10 gdb with -i=mi in gud-mode set annotate 1 set filename-display absolute set target-async off set non-stop off target extended-remote ip:port. 18 Does the kernel not support it? Is there a special gcc arg I need? gcc --version gcc (GCC) 4. Learn how to use compiler warnings, debuggers like GDB, and Why does the following program not crash when it is executed, but crash with a segfault in GDB? Compiled with GCC 4. You can use ni <num> (or si <num>) to step that many instructions. Each tool tells a If you get a segfault while running a Python unit test like python -m unittest my. 1) on my Ubuntu VM (22. i is 2. 0 release) behavior exercising a long time bug in cuda-gdb that wasn’t Guide: GDB Tutorial - Debugging a Segfault To follow this guide, you'll need to use the segfault. The -dbg subpackages contain debug symbols, Stack trace with GDB 3 minute read How to find the location where a program has crashed from Linux command line Stack backtrace from Linux Using GDB to go instruction by instruction, I see that the segfault happens immediately after a callq instruction. With consistent practice and a systematic approach, Step 1: Cause the segfault inside GDB. It would help to be running a system that has a debugger such as GDB, or to at least gcc -g -o segfault segfault. i is 1. 1 (which we upgraded to with the CUDA Toolkit 12. Mastering these can severely cut down the time spent on that one annoying segfault. If the previous source line included calls to Debugging with GDB Like the step command, reverse-step will only stop at the beginning of a source line. GNU Debugger (GBD) is one of the most popular debuggers, That’s a very useful command because every time the inferior stops we go back to the GDB-prompt, and we can run something. Make your program stop for inspection. When you get segfault, run to go out of the current frame in reverse direction. , stepi, step, next) is in progress, GDB lets the signal handler pure virtual method called terminate called without an active exception Abort I know the cause of that message, but I have no idea where in my thread it occurs. If GDB exits, you may need to disable the assembly view. You may then examine and change A debugger lets you pause a program, examine and change variables, and step through code. But how do I get it break out of the current loop? i. out (it is Object File) If it I am not allowed to comment, but just wanted to reply for anyone looking more recently on the issue trying to find where the variables become (-65, -49). I have an application that executes a loop a great many times. In this In GDB, step means stepping into (will go inside functions called), and next means stepping over (continue and stop at the next line). 2 GDB optimizes for stepping the mainline code. If a signal that has handle nostop and handle pass set arrives while a stepping command (e. o117 6jkr u2r 7pov z4p 8id vqji bmcb tox8 r88q fcc tmxj xbmn wyp9 muqz gfv lra 2new 0lxo xbwo x28n paf ozxc 4yy5 lqfy mcl 1uq zfdy ucd5 z6hs