Note that the test program is dodgy:
pipe(&(0x7f0000000100)={<r0=>0xffffffffffffffff, <r1=>0xffffffffffffffff})
r2 = socket$inet_udp(0x2, 0x2, 0x0)
r2 is closed here:
close(r2)
r3 = socket$inet_udp(0x2, 0x2, 0x0)
setsockopt$sock_int(r3, 0x1, 0x6, &(0x7f0000000140)=0x32, 0x4)
bind$inet(r3, &(0x7f0000000000)={0x2, 0x0, @dev={0xac, 0x14, 0x14, 0x15}}, 0x10)
connect$inet(r3, &(0x7f0000000200)={0x2, 0x0, @broadcast}, 0x10)
sendmmsg(r3, &(0x7f0000000180)=[{{0x0, 0x0, 0x0}}, {{0x0, 0xfffffffffffffed3, &(0x7f0000000940)=[{&(0x7f00000006c0)='O', 0x57e}], 0x1}}], 0x4000000000003bd, 0x8800)
write$binfmt_misc(r1, &(0x7f0000000440)=ANY=[], 0x8)
but then used here:
splice(r0, 0x0, r2, 0x0, 0x4ffe0, 0x0)
As it happens, r3 will probably end up referring to the same fd as r2 did, but
that's not guaranteed.
David
