I get this:

7041 set_robust_list(0x7fff93dc3980, 24) = -1 ENOSYS (Function not implemented)

The system call works on 4.14. Looks like the probing for futex_cmpxchg_enabled goes wrong.

Sorry, I have no idea where to start digging. I don't see anything obvious in dmesg.

I'm trying to revert

commit 30d6e0a4190d37740e9447e4e4815f06992dd8c3
Author: Jiri Slaby <jsl...@suse.cz>
Date:   Thu Aug 24 09:31:05 2017 +0200

    futex: Remove duplicated code and fix undefined behaviour

to see if it makes a difference.

Thanks,
Florian

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