r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000040)='/sys/kernel/kexec_crash_size', 0x0, 0x0)
mmap$IORING_OFF_SQ_RING(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x13, r0, 0x0)