[LTP] [PATCH] pty/pty02: new test for hang involving EXTPROC|ICANON terminal mode

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> + * Regression test for commit 966031f340185 ("n_tty: fix EXTPROC vs ICANON
> + * interaction with TIOCINQ (aka FIONREAD)").  The test reproduces a hang
> + * (infinite loop in the kernel) after a pseudoterminal is put in both
> canonical
> + * (ICANON) and external processing (EXTPROC) mode, some data is written to
> the
> + * master and read from the slave, and the FIONREAD ioctl is called on the
> + * slave.  This is simplified from a syzkaller-generated reproducer.
> + */
> +
> +#include <stdlib.h>
> +#include <termio.h>
> +
> +#include "tst_test.h"
> +
> +static void do_test(void)
> +{
> +	struct termios io = { .c_lflag = EXTPROC | ICANON };

Hi,

I'm running into compilation errors on older distros (RHEL5/6)
with this test:

pty02.c: In function ‘do_test’:
pty02.c:34: error: ‘EXTPROC’ undeclared (first use in this function)
pty02.c:34: error: (Each undeclared identifier is reported only once
pty02.c:34: error: for each function it appears in.)
make: *** [pty02] Error 1

We should probably ifdef the test, because adding define to LAPI
still makes it fail:

tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
pty02.c:44: BROK: tcsetattr() failed: EINVAL

Regards,
Jan