Hi,

the commit 337f13046ff03717a9e99675284a817527440a49 is saying that it
change to syscall to an equivalent to FUTEX_WAIT_BITSET |
FUTEX_CLOCK_REALTIME with a bitset of FUTEX_BITSET_MATCH_ANY.

It seems wrong to me, because in case of FUTEX_WAIT, in
"SYSCALL_DEFINE6(futex", we convert relative timeout to absolute
timeout [1].

So FUTEX_CLOCK_REALTIME | FUTEX_WAIT is expecting a relative timeout
when FUTEX_WAIT_BITSET take an absolute timeout.

To make it work you have to use something like the (untested) attached
patch.

Matthieu

[1]
        if (cmd == FUTEX_WAIT)
            t = ktime_add_safe(ktime_get(), t);