On 01/16/2015 09:40 AM, Jeff Layton wrote:
> On Fri, 16 Jan 2015 09:31:23 -0500
> Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:
>
>> On 01/15/2015 03:22 PM, Jeff Layton wrote:
>>> Ok, I tried to reproduce it with that and several variations but it
>>> still doesn't seem to do it for me. Can you try the latest linux-next
>>> tree and see if it's still reproducible there?
>>
>> It's still not in in today's -next, could you send me a patch for testing
>> instead?
>>
>
> Seems to be there for me:
>
> ----------------------[snip]-----------------------
> /*
> * This function is called on the last close of an open file.
> */
> void locks_remove_file(struct file *filp)
> {
> /* ensure that we see any assignment of i_flctx */
> smp_rmb();
>
> /* remove any OFD locks */
> locks_remove_posix(filp, filp);
> ----------------------[snip]-----------------------
>
> That's actually the right place to put the barrier, I think. We just
> need to ensure that this function sees any assignment to i_flctx that
> occurred before this point. By the time we're here, we shouldn't be
> getting any new locks that matter to this close since the fcheck call
> should fail on any new requests.
>
> If that works, then I'll probably make some other changes to the set
> and re-post it next week.
>
> Many thanks for helping me test this!
You're right, I somehow missed that.
But it doesn't fix the issue, I still see it happening, but it seems
to be less frequent(?).
Thanks,
Sasha
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