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G D B Travel

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5 Middle Meadow Shireoaks

Worksop S81 8PX

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8-16 seat Minbus Travel Airport Transfers, Days out, Nights out, School Runs …

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i have used gdb a couple of times when i have been travelling to various airports with family and have used for a wedding and a couple of nights out. have not yet been disappointed, helpful when booking and organising and have no complaints with the prices. the larger mercedes-benz minibus, as far as i know, is unlike any other in town and i love travelling on it. would recommend

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Time travel debugging in GDB

WRITTEN BY Undo User | LAST UPDATED 24th May 2024

What is time travel debugging?

Time travel debugging (also sometimes called reversible debugging) is a handy feature of some debuggers that allows you to step back through the execution of a program and examine the data prior to an exception being thrown or a breakpoint being reached (as opposed to only being able to view data at that time and onwards). This can be especially helpful for examining errors that only appear once in a thousand runs, or after several hours of a program running. GDB has the feature built in, and some dedicated time travel debuggers such as rr and UDB / LiveRecorder exist too.

Note: this 7 minute clip is an extract of my talk at C++ on Sea in July 2022. You can watch the full presentation on the C++ on Sea YouTube channel .

Normal GDB Debugging Process

Let’s say we have this program and don’t know where the issue is:

Most of the time, this program will execute correctly, and generate some random numbers and sort them, however occasionally this program will get a Segmentation Fault. However, attempting to debug it the usual way will not reveal much useful data.

We can inspect the core dump in gdb:

However looking at this has proven unhelpful, as none of the data can be inspected. We just know that the stack has corrupted, which it told us when the program crashed initially.

GDB With Recording

Now let’s try running the sort with GDB recording enabled.

Now we’ve run the program in gdb repeatedly so we can catch when the program throws an exception while recording. When this happens, the backtrace shown is still not particularly useful, but we can have a look at the program counter and see that where it was trying to jump to is invalid.

However, we can step backwards through the program’s execution to see what it tried to do immediately before the Segfault.

Perhaps expected of a smashed stack, the program has failed when trying to return to where the stack was pointing to, as the stack has corrupted and the address stored is invalid. Having a look at the memory at the stack pointer we can see it is pointing to the invalid address we found earlier. Now we can set a watchpoint on this address and reverse-continue to see the line of code that most recently wrote to the stack.

As we can see, it has failed when writing to the element of the array at the position currently referenced by i . As we are back to a point in the program’s execution where the stack isn’t corrupted, we can examine the array to figure out what went wrong.

Ah, i = 35 but the array is only of length 32. From this we can infer that the line randomly choosing the maximum i is at fault.

And yes, we are calling modulo the number of bytes in the array instead of the number of elements in the array, meaning sometimes the program will try to write outside of the array.

So we have shown an example use case of how to use time travel debugging and its advantages. This is a fairly short program, so using the GDB inbuilt reversible debugging was alright, but compared to other solutions it is very slow. rr (record and replay) is much faster; but it has limited support for different features based on the platform (such as needing access to the performance counters, or certain types of program, like ones that use shared memory or async I/O). So if rr doesn’t work for you, check out  UDB and  LiveRecorder – they cover all bases. 🙂 (i.e. work on almost any program no matter how complex and in almost any Linux environment)

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Mini Bus Hire for All Occassions

Minibus hire from GDB TRavel of Worksop, 8 and 16 seater, minibus, executive minibuses, travel in luxury and style.

Minibus Hire Worksop - 01909 477 934

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GDB Travel, 5 Middle Meadow, Shireoaks, Worksop, Nottinghamshire S81 8PX

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GDB Travel 5 Middle Meadow, Shireoaks, Worksop, Nottinghamshire, S81 8PX

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THE SMALL PRINT

Programming Tutorials

• Breakpoints and Backtrace traversal – gdb debugger Tutorial & Examples

In this article we will discuss how to use breakpoints in gdb and check backtrace etc.

How to add breakpoints in gdb

Breakpoints can be added only at “gdb” prompt i.e.

To add a breakpoint in running application just press the “Ctrl-C” command to get the “gdb prompt back. Otherwise you can also add breakpoints before executing the run command.

Adding break point on a line number i.e.

“break”, “br” ,”b” all are same.

Adding break point with a function name

For global functions,

For member functions,

Frequently Asked:

• Conditional Breakpoints and watchpoints | gdb debugger Tutorial and examples
• How to attach gdb with running process
• Compiling C++ with Debug Symbols – gdb debugger Tutorial & Examples

Now if you have added the break point before executing “run” command just press do the run command.

Otherwise if you have added the breakpoint after stopping the running program using “Ctrl-C” , then press “c” to continue the application i.e.

How to check btacktrace / stacktrace using gdb

You can check the backtrace when a running code hits a breakpoint or when you stop the running application using “Ctrl-C”. But generally we check the backtrace when some break point is hit.

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When a breakpoint is hit “gdb” prompt will come like this,

To check the backtrace use “bt” command

It will show backtrace as follows,`

It shows the frames in stack current frame is at top i.e. #0, to go to any other frame in stack use command “f <number of frame>” i.e

At this point you can print variables value , execute some code , also go forward and backward.

Checking Values while debugging

Use the command “print” or “p” to print the values when some break point is hit i.e.

Changing Values while debugging

Use the command “set” to change the values when some break point is hit i.e.

Execute Code while debugging

you can execute some code like some function when a break point is hit i.e. execute a global function ehen breakpoint is hit i.e.

It will execute the secondFunction().

Traversal When breakpoint is hit

To traverse over the code when a break point is hit use following commands,

• n — Runs the next line in step over mode i.e. will not go inside any function just run the next line in current function.
• s — Runs the next line in step in mode i.e. if next line is a function call then it will go inside that function.

To list out all breakpoints use command,

To delete a breakpoint use command.

d <breakpoint number>

for example,

Related posts:

• Remote Debugging Tutorial using gdb Debugger
• Debugging Multi-threading Applications with gdb debugger
• How to use vector efficiently in C++?
• c++ std::vector and Iterator Invalidation example
• What is a Memory Leak in C++ ?
• Designing Callbacks in C++ – Part 1: Function Pointers
• Designing Callbacks in C++ – Part 2: Function Objects & Functors
• Lambda Functions in C++
• What is std::deque and how deque works internally.
• Designing a Thread Pool Framework Part 1: What’s the need of a Thread Pool
• deque vs vector : What to choose ?
• C++ std::list Tutorial, Example and Usage Details
• How does new and delete operator works internally ?
• Difference between delete & []delete and rise of Memory Leaks
• Handling Out Of Memory Errors in Code
• Restrict dynamic deletion of objects created on stack
• deleting this pointer and internal details of this pointer

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