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SubjectRe: [PATCH stable-rc queue/4.9 1/1] futex: Provide distinct return value when owner is exiting
On 2021/2/22 18:16, Greg KH wrote:
> On Mon, Feb 22, 2021 at 03:03:28PM +0800, Xiaoming Ni wrote:
>> From: Thomas Gleixner<>
>> commit ac31c7ff8624409ba3c4901df9237a616c187a5d upstream.
> This commit is already in the 4.9 tree. If the backport was incorrect,
> say that here, and describe what went wrong and why this commit fixes
> it.
> Also state what commit this fixes as well, otherwise this changelog just
> looks like it is being applied again to the tree, which doesn't make
> much sense.
> thanks,
> greg k-h
> .

I wrote a cover for it. but forgot to adjust the title of the cover:

I found a dead code in the queue/4.9 branch of the stable-rc repository.

commit c27f392040e2f6 ("futex: Provide distinct return value when
owner is exiting")
The function handle_exit_race does not exist. Therefore, the
change in handle_exit_race() is ignored in the patch round.

commit e55cb811e612 ("futex: Cure exit race")
Define the handle_exit_race() function,
but no branch in the function returns EBUSY.
As a result, dead code occurs in the attach_to_pi_owner():

int ret = handle_exit_race(uaddr, uval, p);
if (ret == -EBUSY)
*exiting = p; /* dead code */

To fix the dead code, modify the commit e55cb811e612 ("futex: Cure exit
or install a patch to incorporate the changes in handle_exit_race().

I am unfamiliar with the processing of the stable-rc queue branch,
and I cannot find the patch mail of the current branch in
Therefore, I re-integrated commit ac31c7ff8624 ("futex: Provide distinct
return value when owner is exiting").
And wrote a cover (but forgot to adjust the title of the cover):

Xiaoming Ni

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