Re: [LTP] [PATCH] syscalls/epoll_ctl04: add ELOOP to expected errnos

[Avinesh Kumar <akumar@suse.de>]

Hi,

Reviewed-by: Avinesh Kumar <akumar@suse.de>
Tested-by: Avinesh Kumar <akumar@suse.de>

tst_test.c:2007: TINFO: Tested kernel: 6.17.0-rc1-1-default+ #11 SMP PREEMPT_DYNAMIC Wed Aug 13 16:42:23 CEST 2025 x86_64
tst_kconfig.c:88: TINFO: Parsing kernel config '/proc/config.gz'
tst_kconfig.c:676: TINFO: CONFIG_FAULT_INJECTION kernel option detected which might slow the execution
tst_test.c:1825: TINFO: Overall timeout per run is 0h 02m 00s
epoll_ctl04.c:61: TPASS: epoll_ctl(..., EPOLL_CTL_ADD, ...) with number of nesting is 5 : ELOOP (40)


Thank you,
Avinesh


On Tuesday, August 5, 2025 11:27:23 AM CEST Jan Stancek via ltp wrote:
> Kernel commit f2e467a48287 ("eventpoll: Fix semi-unbounded recursion")
> added an extra checks for determining the maximum depth of an upwards walk,
> which startign with 6.17-rc kernels now hits ELOOP before EINVAL.
> 
> Add ELOOP to list of expected errnos.
> 
> Signed-off-by: Jan Stancek <jstancek@redhat.com>
> ---
>  testcases/kernel/syscalls/epoll_ctl/epoll_ctl04.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/epoll_ctl/epoll_ctl04.c b/testcases/kernel/syscalls/epoll_ctl/epoll_ctl04.c
> index 955959b6b266..feb49623b15e 100644
> --- a/testcases/kernel/syscalls/epoll_ctl/epoll_ctl04.c
> +++ b/testcases/kernel/syscalls/epoll_ctl/epoll_ctl04.c
> @@ -51,13 +51,16 @@ static void cleanup(void)
>  
>  static void verify_epoll_ctl(void)
>  {
> +	const int exp_errnos[] = {EINVAL, ELOOP};
> +
>  	new_epfd = epoll_create(1);
>  	if (new_epfd == -1)
>  		tst_brk(TBROK | TERRNO, "fail to create epoll instance");
>  
>  	events.data.fd = epfd;
> -	TST_EXP_FAIL(epoll_ctl(new_epfd, EPOLL_CTL_ADD, epfd, &events), EINVAL,
> -		     "epoll_ctl(..., EPOLL_CTL_ADD, ...) with number of nesting is 5");
> +	TST_EXP_FAIL2_ARR(epoll_ctl(new_epfd, EPOLL_CTL_ADD, epfd, &events),
> +		exp_errnos, ARRAY_SIZE(exp_errnos),
> +		"epoll_ctl(..., EPOLL_CTL_ADD, ...) with number of nesting is 5");
>  	SAFE_CLOSE(new_epfd);
>  }
>  
> 





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