r0 = syz_io_uring_setup(0x21, &(0x7f0000000080)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f00000a0000)=nil, &(0x7f00000b0000)=nil, &(0x7f0000000180)=<r1=>0x0, &(0x7f0000002a40)=<r2=>0x0)
io_uring_register$IORING_REGISTER_BUFFERS(r0, 0x0, &(0x7f0000000100)=[{0x0}], 0x1)
syz_io_uring_submit(r1, r2, &(0x7f0000000040)=@IORING_OP_READ_FIXED={0x4, 0x0, 0x0, @fd_index, 0x0, 0xfffffffffffffffb, 0x400004}, 0x0)
io_uring_enter(r0, 0x76d3, 0x0, 0x0, 0x0, 0x0)