On Tue, Aug 17, 2021 at 10:47:14AM -0500, Eric W. Biederman wrote: > "Ma, XinjianX" <xinjianx.ma@xxxxxxxxx> writes: > > > Hi Alexey, > > > > When lkp team run kernel selftests, we found after these series of patches, testcase mqueue: mq_perf_tests > > in kselftest failed with following message. > > Which kernel was this run against? > > Where can the mq_perf_tests that you ran and had problems with be found? > > During your run were you using user namespaces as part of your test > environment? > > The error message too many files corresponds to the error code EMFILES > which is the error code that is returned when the rlimit is reached. > > One possibility is that your test environment was run in a user > namespace and so you wound up limited by rlimit of the user who created > the user namespace at the point of user namespace creation. > > At this point if you can give us enough information to look into this > and attempt to reproduce it that would be appreciated. I was able to reproduce it on master without using user namespace. I suspect that the maximum value is not assigned here [1]: set_rlimit_ucount_max(&init_user_ns, UCOUNT_RLIMIT_MSGQUEUE, task_rlimit(&init_task, RLIMIT_MSGQUEUE)); [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/fork.c#n832 > > If you confirm and fix the issue, kindly add following tag as appropriate > > Reported-by: kernel test robot lkp@xxxxxxxxx > > > > ``` > > # selftests: mqueue: mq_perf_tests > > # > > # Initial system state: > > # Using queue path: /mq_perf_tests > > # RLIMIT_MSGQUEUE(soft): 819200 > > # RLIMIT_MSGQUEUE(hard): 819200 > > # Maximum Message Size: 8192 > > # Maximum Queue Size: 10 > > # Nice value: 0 > > # > > # Adjusted system state for testing: > > # RLIMIT_MSGQUEUE(soft): (unlimited) > > # RLIMIT_MSGQUEUE(hard): (unlimited) > > # Maximum Message Size: 16777216 > > # Maximum Queue Size: 65530 > > # Nice value: -20 > > # Continuous mode: (disabled) > > # CPUs to pin: 3 > > # ./mq_perf_tests: mq_open() at 296: Too many open files > > not ok 2 selftests: mqueue: mq_perf_tests # exit=1 > > ``` > > > > Test env: > > rootfs: debian-10 > > gcc version: 9 > > > > ------ > > Thanks > > Ma Xinjian > > Eric > -- Rgrds, legion
