[LTP] [PATCH v4] unshare03.c: Add test coverage for dup_fd() failure handling in unshare_fd()

[Andrea Cervesato]

Hi,

On 3/5/25 08:04, Wei Gao wrote:
>>> +	if (!SAFE_CLONE(&args)) {
>>> +		SAFE_FILE_PRINTF(FS_NR_OPEN, "%d", nr_open);
>>> +		TST_EXP_FAIL(unshare(CLONE_FILES), EMFILE);
>>> +		TST_CHECKPOINT_WAKE(0);
>> There's no need to use synchronization mechanisms because at the end of the
>> test we call tst_reap_children() waiting for all the children to be
>> completed.
> There are some race condition happen and trigger failure sometimes if you do not
> use this synchronization(Currently no idea why this happen).
> Rerun case 30 times can trigger 2 or 3 cases failed if not use synchronization in my env.

I'm really trying to reproduce this issue, but I can't. Run the test 
with 100000 iterations and it didn't stuck. Can you please check again? 
I tried on TW.

Andrea