What can cause a SIGBUS?

SIGBUS can also be caused by any general device fault that the computer detects, though a bus error rarely means that the computer hardware is physically broken—it is normally caused by a bug in software. Bus errors may also be raised for certain other paging errors; see below.

What is SIGBUS signal?

SIGBUS (bus error) is a signal that happens when you try to access memory that has not been physically mapped. This is different to a SIGSEGV (segmentation fault) in that a segfault happens when an address is invalid, while a bus error means the address is valid but we failed to read/write.

What causes bus fault?

Technical Notes. Bus errors can result from either a programming error or device corruption on your system. Some common causes of bus errors are: invalid file descriptors, unreasonable I/O requests, bad memory allocation, misaligned data structures, compiler bugs, and corrupt boot blocks.

What causes Sigill?

The SIGILL signal is raised when an attempt is made to execute an invalid, privileged, or ill-formed instruction. SIGILL is usually caused by a program error that overlays code with data or by a call to a function that is not linked into the program load module.

How do you debug a bus error?

Using gdb to Do Simple Debugging

1. Compile your code with the -g option.
2. Then type gdb.
3. At the prompt type file nameOfExecutable.
4. When it gets the bus error, seg fault or whatever, the location in your source code will be displayed.
5. quit gets you out of the debugger.

What is HardFault?

HardFault refers to all classes of faults that cannot be handled by any of the other exception mechanisms. Typically, HardFault is used for unrecoverable system failures.

Can SIGSEGV be caught?

The only signal you can’t catch is SIGKILL or Signal 9; this is so your app can be killed by an administrator or the OS itself if there’s need to do so. signal(2) can be set up to catch SIGSEGV signals, which are the signals generated by a segfault.

What is fatal signal 11 in C++?

Signal 11 (SIGSEGV, also known as segmentation violation) means that the program accessed a memory location that was not assigned to it. That’s usually a bug in a program. So if you’re writing your own program, that’s the most likely cause. It can also commonly occur with some hardware malfunctions.