Saving core file in gdb

Question

Is it possible to save/dump core file using gdb? Sometimes I want to save file to analyze it later.

score 155 · Accepted Answer · answered Sep 24 '10 at 18:55

155

Issue the 'generate-core-file' command in gdb.

(gdb) help generate-core-file
Save a core file with the current state of the debugged process.
Argument is optional filename.  Default filename is 'core.<process_id>'.
(gdb) break main
Breakpoint 1 at 0x400e0b: file utils/udec.c, line 36.
(gdb) r
Starting program: /home/nos/build/utils/udec

Breakpoint 1, main (argc=1, argv=0x7fffffffe9a8) at utils/udec.c:36
36              int fileargc = 1;
(gdb) generate-core-file
Saved corefile core.7336

answered Sep 24 '10 at 18:55

nos

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It will be saved in GDB's current working directory, which can be seen via the `pwd` command. If you need to change it, you can do so with `cd`, just like at a shell. – Jonathon Reinhart Jul 12 '15 at 13:58
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@Jonathon_Reinhart pass core-file path as `generate-core-file` first argument if you want to save it in certain place – SergA Dec 18 '15 at 10:54

score 26 · Answer 2 · answered May 27 '16 at 10:42

26

You can also use gcore <pid> to produce cores.

answered May 27 '16 at 10:42

Meinew

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this should be in comment part – V-rund Puro-hit May 27 '16 at 11:01
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Please have a look to this page http://stackoverflow.com/help/privileges/comment : When shouldn't I comment?...."Answering a question or providing an alternate solution to an existing answer;" – Meinew May 27 '16 at 11:17
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Looks like `gcore` is only supported in newer gdb versions. Old ones require `generate-core-file`. – scai Sep 19 '18 at 08:23
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This appears to be a short name for `generate-core-file`, both doing the same thing. – Ciro Santilli OurBigBook.com Dec 24 '19 at 17:13

Saving core file in gdb

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