r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/kernel/kexec_crash_size', 0x0, 0x0)
r1 = fcntl$dupfd(r0, 0x0, r0)
pread64(r1, &(0x7f0000000180)=""/4096, 0x1000, 0x0)