unshare(0x28020600) r0 = creat(&(0x7f0000000040)='./file0\x00', 0x0) fremovexattr(r0, &(0x7f0000000000)=@known='system.posix_acl_access\x00') ioctl$BLKTRACESETUP(0xffffffffffffffff, 0xc0481273, 0x0)