Please check qemu-5.1.0.
This has been fixed by:
2d92c6827ca0 ("linux-user: implement OFD locks")
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=2d92c6827ca0
perhaps you can send a patch to the qemu-devel ML to add the strace
part.
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https://bugs.launchpad.net/bugs/1893010
Title:
qemu linux-user doesn't support OFD fcntl locks
Status in QEMU:
New
Bug description:
"Open file description locks (non-POSIX)", as they are described in
fcntl(2) man page, aren't supported by qemu-user and attempting to
use those results in EINVAL. I'm on Gentoo with latest QEMU version
currently available (5.0.0-r2), and trying to emulate ppc64 and s390x
on x86_64.
Looking at linux-user/syscall.c, I'm guessing the issue is in (at
least) `target_to_host_fcntl_cmd` where switch reaches the default
clause as there're no cases for F_OFD_SETLK / F_OFD_SETLKW /
F_OFD_GETLK.
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