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>
