r0 = openat$procfs(0xffffffffffffff9c, &(0x7f0000000080)='/proc/sysvipc/shm\x00', 0x0, 0x0)
preadv(r0, &(0x7f00000000c0)=[{&(0x7f0000000000)=""/123, 0x7b}], 0x1, 0xfffffff9, 0x0)