r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f00000000c0)='/sys/kernel/kexec_crash_loaded', 0x0, 0x0)
preadv(r0, &(0x7f0000000200)=[{&(0x7f0000000100)=""/64, 0x40}], 0x1, 0x0, 0x0)