Graphene does not support shared futexes b/w processes

[anjalirai-intel]

Description of the problem

Shared futexes does not wake up and fails with error "tst_checkpoint_wait(0, 10000): ETIMEDOUT (110)" followed by "tst_checkpoint_wake(0, 1, 10000): errno=ETIMEDOUT(110): Connection timed out"

Steps to reproduce

Run following LTP tests. For some of the tests manifest file update may be required.

1. dirtyc0w
2. futex_wait02
3. getsockopt02
4. pause01
5. pipe02
6. pipe03
7. pipe13
8. setpgid03
9. sighold02
10. waitid02
11. waitpid06
12. waitpid07
13. waitpid08
14. waitpid09
15. waitpid10
16. waitpid11
17. waitpid12
18. waitpid13

Expected results

./getsockopt02

TINFO: Timeout per run is 0h 05m 00s
TPASS: Test passed

Summary:
passed   1
failed   0
skipped  0
warnings 0

Actual results

graphene-direct ./getsockopt02

/home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/lib/tst_test.c:1250: TINFO: Timeout per run is 0h 05m 00s
/home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/testcases/kernel/syscalls/getsockopt/getsockopt02.c:58: TFAIL: Error while getting socket option: ENOPROTOOPT (92)
/home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/lib/tst_checkpoint.c:149: TBROK: /home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/testcases/kernel/syscalls/getsockopt/getsockopt02.c:36: tst_checkpoint_wait(0, 10000): ETIMEDOUT (110)
/home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/lib/tst_checkpoint.c:162: TBROK: /home/intel/jenkins/workspace/local_ci_graphene_native/graphene/LibOS/shim/test/ltp/ltp_src/testcases/kernel/syscalls/getsockopt/getsockopt02.c:70: tst_checkpoint_wake(0, 1, 10000): ETIMEDOUT (110)

Summary:
passed   0
failed   0
skipped  0
warnings 0

Label

feature request, not bug

[mkow]

It's just a missing feature, if you want us to implement it then please provide a real world example which uses it.