socketpair$nbd(0x1, 0x1, 0x0, &(0x7f0000001000)={0xffffffffffffffff, <r0=>0xffffffffffffffff})
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000040)='/sys/kernel/vmcoreinfo', 0x0, 0x0)
sendfile(r0, r1, 0x0, 0x7)