On 10/29/21 2:32 AM, Christian Brauner wrote:
On Fri, Oct 29, 2021 at 10:45:28AM +0800, Li Zhijian wrote:
0Day/LKP observed that the kselftest blocks foever since one of the
pidfd_wait doesn't terminate in 1 of 30 runs. After digging into
the source, we found that it blocks at:
ASSERT_EQ(sys_waitid(P_PIDFD, pidfd, &info, WCONTINUED, NULL), 0);
we can reproduce it by:
$ while true; do make run_tests -C pidfd; done
a delay to ensure that the parent can see child process WCONTINUED.
CC: Christian Brauner <christian@xxxxxxxxxx>
CC: Shuah Khan <shuah@xxxxxxxxxx>
CC: Philip Li <philip.li@xxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxxxxx>
---
Not a fan of the usleep() solution but if it fixes it it's fine for
a test, I think.
Acked-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
I don't like introducing usleep() which will increase the kselftest
run-time. Every little bit adds up if we allow usleep() in tests.
thanks,
-- Shuah
