splice07 fails on kernels <5.10 about ltp HOT 2 OPEN

Thanks for a detailed table.

@metan-ucw @mdoucha know more than me. AFAIK we noticed at least incorrect errno EISDIR (obviously there is also ENODATA) and hang on TST_FD_EPOLL (I did not know about the following hangs), although AFAIK we did not reported it to the kernel mainline ML (lore).

splice07 seems to depend on torvalds/linux@36e2c74 ("fs: don't allow splice read/write without explicit ops") to pass.

Yes (https://lore.kernel.org/ltp/ZbO-Pl9S7KH2cKkb@yuki/).

FYI before the latest release we whitelisted 2 cases: (c042185, e5970b2) and had a plan to add tests which actually test
splice() on /dev/zero and /proc/self/maps for kernels between v4.4 and v5.3 where it was working (https://lore.kernel.org/ltp/20240126132046.GA508599@pevik/).

from ltp.

The right approach would be to fix the kernel since all these failures are kernel bugs (maybe except for inotify -> writable pipe). It does not make sense to modify the test, not even to add a kernel version check.

from ltp.