‰ gdb ./a.out
GNU gdb (Gentoo 7.2 p1) 7.2
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Reading symbols from /tmp/a.out...done.
(gdb) break main
Breakpoint 1 at 0x4005dc: file a.c, line 6.
Starting program: /tmp/a.out
Breakpoint 1, main () at a.c:6
6 char *a = malloc(10000000);
(gdb) call setbuf(stdout, 0)
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ab9096 in setbuffer () from /lib64/libc.so.6
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on".
Evaluation of the expression containing the function
(setbuf) will be abandoned.
When the function is done executing, GDB will silently stop.