Termination reason, registers, memory map, and stack trace. This does not mean that GDB isn't useful for this task, it's just something to be aware of. objdump never skips instructions and might skip the source context instead - an approach, that I prefer for debugging at this level.
Our instruction at 0x400a4b is not listed for that very reason.
Cmus segmentation fault code#
In the case of an optimized binary, GDB might skip instructions in this mode if the source code cannot be mapped unambiguously. The following example contains a classic use-after-free memory error: Fortunately, a workaround exists for post-mortem debugging that has the potential to save the day, but given its inherent limitations, your mileage may vary from case to case. The target filesystem has insufficient disk space resulting in a partial dump.įor all of those, the net result is the same: there's no (valid) core dump to use for analysis.The target directory (current working directory or a directory in /proc/sys/kernel/core_pattern) does not exist or is inaccessible due to filesystem permissions or SELinux.Core dump generation is disabled altogether (using nf or ulimit).A segmentation fault or, more generally, abnormal process termination had to be investigated with the caveat that a core dump was not available.įor Linux, our platform of choice for this walkthrough, a few reasons come to mind: In the past, I had to deal with this kind of restriction on several occasions.
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