Hello,
from a private -stable review we think that the commit 9e9aab5dbf
("futex: Ensure get_futex_key_refs() always implies a barrier" [1]) is
not correctly back ported to 3.4.x:
The issue is that the memory barrier is introduced into
drop_futex_key_refs() function instead of get_futex_key_refs() function.
Additionally, we are unsure if the futex commits this commit is fixing
are really in < 3.4.106. I.e. we are unsure if this fix is needed at
all. Or at least if some additional futex commits are needed.
Do you like to check?
Best regards
Dirk
[1]
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=9e9aab5dbf6f13478cd996692ed9679af2404fc7
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