[tj-sched-ext:for-next] [sched_ext] 7900aa699c: kernel-selftests-bpf.sched_ext.runner.init_enable_count_#.fail

[tj-sched-ext:for-next] [sched_ext] 7900aa699c: kernel-selftests-bpf.sched_ext.runner.init_enable_count_#.fail

[kernel test robot]

Hello,

kernel test robot noticed "kernel-selftests-bpf.sched_ext.runner.init_enable_count_#.fail" on:

commit: 7900aa699c34401cf5d0c701d9ef72880ddc1a83 ("sched_ext: Fix cgroup exit ordering by moving sched_ext_free() to finish_task_switch()")
https://git.kernel.org/cgit/linux/kernel/git/tj/sched_ext.git for-next

[test failed on linux-next/master b179ce312bafcb8c68dc718e015aee79b7939ff0]

in testcase: kernel-selftests-bpf
version: 
with following parameters:

	group: sched_ext



config: x86_64-rhel-9.4-bpf
compiler: gcc-14
test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (Kaby 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/202511141028.39aed7d5-lkp@intel.com



# ===== START =====
# TEST: init_enable_count
# DESCRIPTION: Verify we correctly count the occurrences of init, enable, etc callbacks.
# OUTPUT:
# ERR: init_enable_count.c:63
# Expected skel->bss->init_task_cnt >= num_pre_forks (611 >= 1024)
# not ok 9 init_enable_count # 
# =====  END  =====



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251114/202511141028.39aed7d5-lkp@intel.com



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

Re: [tj-sched-ext:for-next] [sched_ext] 7900aa699c: kernel-selftests-bpf.sched_ext.runner.init_enable_count_#.fail

[Tejun Heo]

Hello,

On Fri, Nov 14, 2025 at 10:21:12AM +0800, kernel test robot wrote:
> kernel test robot noticed "kernel-selftests-bpf.sched_ext.runner.init_enable_count_#.fail" on:
> 
> commit: 7900aa699c34401cf5d0c701d9ef72880ddc1a83 ("sched_ext: Fix cgroup exit ordering by moving sched_ext_free() to finish_task_switch()")
> https://git.kernel.org/cgit/linux/kernel/git/tj/sched_ext.git for-next
> 
> [test failed on linux-next/master b179ce312bafcb8c68dc718e015aee79b7939ff0]

Unfortunately, I can't reproduce this failure.

> # ===== START =====
> # TEST: init_enable_count
> # DESCRIPTION: Verify we correctly count the occurrences of init, enable, etc callbacks.
> # OUTPUT:
> # ERR: init_enable_count.c:63
> # Expected skel->bss->init_task_cnt >= num_pre_forks (611 >= 1024)
> # not ok 9 init_enable_count # 
> # =====  END  =====

Looking at the code, I don't see how init_task_cnt can be lower than
num_pre_forks or how the referenced commit can change that (it only changes
the exit path).

Thanks.

-- 
tejun