r0 = getpgrp(0x0)
ioprio_set$pid(0x1, r0, 0x4000)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000000)='./file1\x00', 0x882c2, 0x0)
fallocate(r1, 0x0, 0x0, 0x1000002)
mmap(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x100000f, 0x1f012, r1, 0x0)
fork()