r0 = fsopen(&(0x7f0000000080)='proc\x00', 0x0)
fsconfig$FSCONFIG_SET_STRING(r0, 0x6, 0x0, 0x0, 0x0)
r1 = fsmount(r0, 0x0, 0x9)
mkdirat(r1, &(0x7f0000000040)='./file0\x00', 0x0)