[LTP] [PATCH v2] inotify: Add test for inotify mark destruction race

[Xiaoguang Wang]

hello,

On 04/14/2016 04:46 PM, Jan Kara wrote:
> On Thu 14-04-16 16:14:25, Xiaoguang Wang wrote:
>> On 04/14/2016 04:15 PM, Jan Kara wrote:
>>> Hello,
>>>
>>> On Thu 14-04-16 10:06:59, Xiaoguang Wang wrote:
>>>> On 08/25/2015 07:29 PM, Cyril Hrubis wrote:
>>>>> Hi!
>>>>>> Interesting, probably SRCU is much slower with this older kernel. From my
>>>>>> experiments 100 iterations isn't quite reliable to trigger the oops in my
>>>>>> testing instance. But 400 seem to be good enough.
>>>>>
>>>>> I've changed the nuber of iterations to 400 and pushed it to git,
>>>>> thanks.
>>>>>
>>>>
>>>> In upstream kernel v4.6-rc3-17-g1c74a7f and RHEL7.2GA, I sometimes get such
>>>> error:
>>>> ---------------------------------------------------------------------------
>>>> inotify06    1  TBROK  :  inotify06.c:104: inotify_init failed: errno=EMFILE(24): Too many open files
>>>> inotify06    2  TBROK  :  inotify06.c:104: Remaining cases broken
>>>> ---------------------------------------------------------------------------
>>>> But look at the inotify06.c, inotify_fd is closed every iteration.
>>>> For normal file descriptors, "close(fd) succeeds" does not mean related kernel
>>>> resources have been released immediately(processes may still reference fd).
>>>>
>>>> Then inotify_fd  also has similar behavior? Even close(inotify_fd) returns,
>>>> that does not mean the number of current inotify instances have decreased one
>>>> immediately, then later inotify_init() calls may exceeds the /proc/sys/fs/inotify/max_user_instances and
>>>> return EMFILE error?  I had added some debug code in kernel, it seems that close(inotify_fd)
>>>> does not make sure current inotify instances decreases one immediately.
>>>>
>>>> So I'd like to know this is expected behavior for inotify? If yes, we can
>>>> echo 400 > /proc/sys/fs/inotify/max_user_instances to avoid EMFILE error.
>>>> If not, this is a kernel bug?
>>>
>>> Interesting, I've never seen this. Number of inotify instances is maintaned
>>> immediately - i.e., it is dropped as soon as the last descriptor pointing to
>>> the instance is closed. So I'm not sure how what you describe can happen.
>>> How do you reproduce the issue?
>> I just call ./inotify06 directly, and about 50% chance, it'll fail(return EMFILE).
> 
> Hum, I've just tried 4.6-rc1 which I have running on one test machine and
> it survives hundreds of inotify06 calls in a loop without issues. I have
> max_user_instances set to 128 on that machine... So I suspect the problem
> is somewhere in your exact userspace setup. Aren't there other processes
> using inotify heavily for that user?
I doubted so, but please see my debug results in my virtual machine, it still
seems that it's a kernel issue...
I add some simple debug code to kernel and ltp test case inotify06, and switched
to a normal user "lege" to have a test.

[lege@localhost inotify]$ uname -r
4.6.0-rc3+

>From testcase_run.info, we can see that inotify_init1 has been called for 240 iterations(0-239),
and the 239th iteration failed(return EMFILE error), meanwhile from dmesg.info, we can also see
that kernel function inotify_new_group() was called for 240 iterations, and the last iteration
failed(exceed the 128 limits). From test results, I think when I ran inotify06, at least for the
period inotify06 ran, there is no other process calling inotify_init1(), so it's not likely a
userspace setup issue. Also from demes.info, you can see that every time inotify_new_group()
was called, group->inotify_data.user->inotify_devs is not always 0. so whether close(inotify_fd)
could not make number of inotify instances dropped as soon as the last descriptor pointing to
the instance is closed? Thanks.

Regards,
Xiaoguang Wang
> 
> 								Honza
> 



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inotify06    1  TBROK  :  inotify06.c:105: inotify_init failed: errno=EMFILE(24): Too many open files
inotify06    2  TBROK  :  inotify06.c:105: Remaining cases broken
inotify06    1  TBROK  :  safe_macros.c:370: inotify06.c:96: unlink(fname_1) failed: errno=ENOENT(2): No such file or directory
inotify06    2  TBROK  :  safe_macros.c:370: Remaining cases broken
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