Oops, wrong list, sorry.
Kind regards,
Petr
> In some tests we are creating the namespaces faster than they are being
> asynchronously cleaned up in the kernel:
> $ sudo ./userns08 -i 10
> userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> userns08.c:36: TBROK: clone3 failed: ENOSPC (28)
> Thus retrying the clone() on ENOSPC (or EUSERS for kernel < 4.9).
> Suggested-by: Cyril Hrubis <[email protected]>
> Signed-off-by: Petr Vorel <[email protected]>
> ---
> changes v1->v2:
> * use TST_RETRY_FN_EXP_BACKOFF() (Cyril)
> NOTE: 0.1s seems to be safe, although using TST_RETRY_FUNC() with 1s
> (the default) would be of course OK.
> Kind regards,
> Petr
> lib/tst_test.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
> diff --git a/lib/tst_test.c b/lib/tst_test.c
> index 384c73e163..2e89d954ec 100644
> --- a/lib/tst_test.c
> +++ b/lib/tst_test.c
> @@ -436,6 +436,9 @@ pid_t safe_fork(const char *filename, unsigned int lineno)
> return pid;
> }
> +/* too fast creating namespaces => retrying */
> +#define TST_CHECK_ENOSPC(x) ((x) >= 0 || !(errno == ENOSPC || errno == EUSERS))
> +
> pid_t safe_clone(const char *file, const int lineno,
> const struct tst_clone_args *args)
> {
> @@ -444,7 +447,7 @@ pid_t safe_clone(const char *file, const int lineno,
> if (!tst_test->forks_child)
> tst_brk(TBROK, "test.forks_child must be set!");
> - pid = tst_clone(args);
> + pid = TST_RETRY_FN_EXP_BACKOFF(tst_clone(args), TST_CHECK_ENOSPC, 0.1);
> switch (pid) {
> case -1: