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Date:   Mon, 11 Dec 2023 15:28:09 +0800
From:   kernel test robot <oliver.sang@intel.com>
To:     Tycho Andersen <tycho@tycho.pizza>
CC:     <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
        <linux-kernel@vger.kernel.org>,
        Christian Brauner <brauner@kernel.org>,
        Oleg Nesterov <oleg@redhat.com>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        <linux-api@vger.kernel.org>, Tycho Andersen <tycho@tycho.pizza>,
        Tycho Andersen <tandersen@netflix.com>, <oliver.sang@intel.com>
Subject: Re: [PATCH v2 1/3] pidfd: allow pidfd_open() on non-thread-group
 leaders
Message-ID: <202312111516.26dc3fd5-oliver.sang@intel.com>
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Hello,

kernel test robot noticed "kernel-selftests.pidfd.pidfd_test.fail" on:

commit: e6d9be676d2c1fa8332c63c4382b8d3227fca991 ("[PATCH v2 1/3] pidfd: allow pidfd_open() on non-thread-group leaders")
url: https://github.com/intel-lab-lkp/linux/commits/Tycho-Andersen/selftests-pidfd-add-non-thread-group-leader-tests/20231208-011135
patch link: https://lore.kernel.org/all/20231207170946.130823-1-tycho@tycho.pizza/
patch subject: [PATCH v2 1/3] pidfd: allow pidfd_open() on non-thread-group leaders

in testcase: kernel-selftests
version: kernel-selftests-x86_64-60acb023-1_20230329
with following parameters:

	group: pidfd


compiler: gcc-12
test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 32G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202312111516.26dc3fd5-oliver.sang@intel.com


besides, we also observed kernel-selftests.pidfd.pidfd_poll_test.fail on this
commit, but clean on parent:

bee0e7762ad2c602 e6d9be676d2c1fa8332c63c4382
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :6          100%           6:6     kernel-selftests.pidfd.pidfd_poll_test.fail
           :6          100%           6:6     kernel-selftests.pidfd.pidfd_test.fail


TAP version 13
1..7
# timeout set to 300
# selftests: pidfd: pidfd_test
# TAP version 13
# 1..8
# # Parent: pid: 2191
# # Parent: Waiting for Child (2192) to complete.
# # Child (pidfd): starting. pid 2192 tid 2192
# # Child Thread: starting. pid 2192 tid 2193 ; and sleeping
# # Child Thread: doing exec of sleep
# Bail out! pidfd_poll check for premature notification on child thread exec test: Unexpected epoll_wait result (c=0, events=0) (errno 0)
# # Planned tests != run tests (8 != 0)
# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
not ok 1 selftests: pidfd: pidfd_test # exit=1

...

# timeout set to 300
# selftests: pidfd: pidfd_poll_test
# # running pidfd poll test for 10000 iterations
# Bail out! death notification wait timeout
# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
not ok 4 selftests: pidfd: pidfd_poll_test # exit=1


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231211/202312111516.26dc3fd5-oliver.sang@intel.com


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki