socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000001740)={0xffffffffffffffff, <r0=>0xffffffffffffffff})
r1 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
fallocate(r1, 0x0, 0x0, 0x1000002)
mmap(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x1000009, 0x1f012, r1, 0x0)
sendmmsg$unix(r0, &(0x7f0000004240)=[{{0x0, 0x0, 0x0}}], 0x1, 0x0)