Apple Silicon, some speculation

Some musings on what we might see from Apple in 2021.
When Apple Silicon was released, it impressed with both its power, and its power efficiency. Here was a system that matched or exceeded the current Apple MacBook Pro and MacBook Air capabilities, but with vastly superior battery life. And, because of Rosetta 2, it even ran existing Intel 64bit code—and astonishingly, did so as fast, or even faster than equivalent Apple Intel models.

Now, there are some caveats on all of the above. There are some things the current M1 SoC doesn’t do as well as the old systems:

  • Maximum of 16GB of memory, with no upgrades possible.
  • Only built-in graphics, no support for external graphics.
  • Only two displays supported. Either the built-in display, plus one external for laptops, or two external monitors for the Mac Mini (cf 3 monitors in current systems)
  • Doesn’t run Windows
  • Doesn’t run other Intel operating systems in a virtual machine


The memory looks at first rather like an “Apple Tax”, with the memory soldered to the motherboard. You can’t add extra memory DIMMS later. As computer memory is a highly commoditised item, this means you pay more—sometimes considerably more—for memory.

However, this “Unified Memory” as Apple refers to it, has considerable advantages over DIMM memory. Putting the memory on the main chip leads to much greater bandwidth, and much lower latency, which obviates the need for dedicated graphics memory. Normally, using shared graphics memory is a performance compromise, lower cost but lower performance—not so with Unified Memory.

This sounds fine, but creating a chip with lots of specialised units (CPUs, Neural engine, GPUs, Networking) and lots of plain old memory (a memory cell, multiplied by several billion) sounds a bit problematic.

Then, I saw photographs of the SoC and the penny dropped. The SoC is not one chip, it’s  two silicon chips joined together on a carrier. One half (well, closer to ⅔) is what I’ll call the CPUs, for simplicity’s sake. The other is plain old memory.Apple M1

And thinking about that leads to speculation about the next systems to come from Apple, and what capabilities they might have.

The Shape of Things to Come

Firstly, let’s consider the Apple product line, excluding iPhones, wearables and HomePods.

  • MacBooks (plain, Pro and Air)
  • Mac mini
  • iMac
  • Mac Pro
  • Apple TV

Of those, only the first two categories were released with Apple Silicon. That makes sense, since the Mac mini is essentially a laptop without a screen, so really the M1 was released for Apple’s laptops with the Mac mini coming along for the ride.

The Apple TV already uses an ARM chip, so it’s really an iPhone without a screen (more nearly, an iPod without a screen). It’s been years since the last Apple TV upgrade, so arguably it’s due a refresh, but there is probably no hurry compared to the iMac and Mac Pro.

So, let’s look a little closer at the M1 SoC and see what its strengths and weaknesses are:


  • Unified memory
  • Thunderbolt & USB with dedicated controllers per port (current Mac models share a controller between two ports)
  • 4 high performance cores
  • 4 high efficiency cores
  • An 8 core GPU that matches bottom end discrete GPUs


  • 16GB memory max
  • Supports only two displays
  • No eGPU support

The eGPU support is almost certainly simply a lack of ARM64 drivers, and so can be fixed with a software upgrade, which I’m betting will happen.

I’m also betting the current M1 SoC chip design doesn’t allow for more memory.

So, any future M1 upgrades might be a little faster (higher clock rate, or other internal tweaks), in an M1X or similar, but are unlikely to have more cores or a vastly faster GPU.

What does that mean for future models?

There may be more laptop releases in 2021 using an M1 or ‘M1X’ with better specs, but they won’t support more displays, more memory, or more CPU cores.

Unified Memory

Unified memory isn’t going away. There won’t be any Apple Silicon models released with support for SIMMs, not even on the MacPro. The latency and bandwidth advantages are just too big.

However, given that half (⅔) the M1 is RAM,


you can easily see the RAM doubling (RAM on both sides, with the processor chip a sandwich in the middle),

M2 with 32GB

or quadrupling with RAM top and bottom as well,

M2 with 64GB

or even eight times, with the RAM entirely encircling the CPU.

M2 with 128GB

So the next system will probably support 32GB, with 64GB and 128GB a possibility. Not bad, but still not up to the 1.5TB supported by the current Mac Pro.


All that RAM needs something to use it, so a bigger chip is likely to have more high performance cores, probably retain the 4 high efficiency cores, but with 6, 8 or 12 high performance cores


The next system will almost certainly support 3 monitors, maybe four.

I imagine that Apple is working on GPUs that are at least twice as powerful as the M1, and on support for eGPUs of course.

Windows and other guests

That leaves the problem of running Windows as a guest operating system, or emulating Intel code well enough to run other operating systems.

Since Microsoft has a version of Windows that runs on ARM64, we will see virtualisation solutions such as Parallels or VMWare that run virtual machines, but for ARM64 guests.

Windows also has its own emulation software that works like Rosetta, emulating x86 on ARM. That means there should soon be an acceptable solution for Windows 10, Linux, BSD and other operating systems that have native ARM64 support.

CodeWeavers have announced CrossOver support for Apple Silicon, which is an alternative solution.

However, that leaves x86 code for older versions of Windows, and MacOS, for those who want or need to keep running such things, and for whom virtual machines have been the perfect answer. The response to this is unclear, but there is probably a lot of work going on right now to get x86 emulators on ARM64 up to speed (or possibly licencing one of the existing ones).


So, what are we going to see released in 2021? Based on the above, here are my predictions for the next wave of Apple Silicon.


The next model to be upgraded (not counting M1X speed bumps for the laptops) will be the iMac, with an ‘M2’ chipset.

  • 12 CPUs (8 high performance and 4 high efficiency)
  • a GPU with double the current performance (16 cores)
  • Support for at least three monitors (built-in plus two more)
  • Support for external GPUs
  • Memory will go up to a maximum of 64GB, possibly 128GB.


  • Possibly a low-end Mac Pro with 12 cores and 128GB will also be announced.


  • The full-noise Mac Pros will await the ‘M3’, in 2022.
  • The Apple TV might get a refresh, but it won’t need any of the power of the M2 and beyond SoCs.


I’m just speculating, from a little country half a world away from Cupertino (literally, half a world away). I don’t imagine the actual specs will be much less that that, but I would not be thunderstruck to find that the Apple engineers have something even more impressive waiting in the wings. I guess we’ll just have to wait and see.

Diana Edith Newbery, PhD 1954-2019

Diana Newbery in Venice
Diana in the courtyard of the Doge’s Palace, Venice


Diana Edith Newbery (née Bennett) PhD, born 9th of September 1954, died the early hours of the 8th of December 2019 after a long coexistence with muscular dystrophy and bone marrow failure. 

Much loved wife, mother and friend of Michael, Mark, Andrew, and Arna. Cherished sister and sister-in-law of Sylvia and Bob Cavanagh, and Prue and Simon Cooke-Willis. Beloved daughter of Beverley and Peter (deceased). Inspirational aunt to Louise, Martin, Julia, and Frances. Diana and the family extend their thanks to the medical professionals who helped her, with particular thanks to Kenepuru day ward staff for their unfailing support. We would also like to thank donors of O+ blood for their generous gift.


Michael Newbery (Husband)

It’s hard to tell a life in a few minutes; it would take more than a lifetime to properly describe a single life well lived!

Given the impossibility of the task, especially for Diana, let us nevertheless begin.

Diana was: pretty, intelligent, quick, curious, funny, kind, witty, amazingly sexy.

Diana was also intensely private. An introvert who poured herself out for her friends.

Diana loved beauty, good design, goodness, kindness, accuracy, knowledge and laughter.

I once told her that I loved her self confidence. She retorted that she was not in any way self-confident, but would admit to “bloody mindedness” (her words), or stubbornness if you prefer.

She almost never wore makeup or scent. She didn’t think she was pretty (objective evidence to the contrary).

She loved, and bought, nice clothes because she loved beauty, not because she was trying to make herself look pretty.

Diana loved animals and was good with them. She would have made a great vet, but chose another path. She did her PhD on “The Karyotypes of Galaxioid Fishes” (That’s whitebait, among others by the way). After several years of trying methods that did not work—the techniques that work for mammal chromosomes didn’t work for fish—she finally found one that did. Her thesis wrote up all the things that didn’t work, much to the delight of her external examiner (the world expert in the field. She described it as like “being marked by God”). Her love of plain talk was evidenced in the thesis: many researchers, when they have to kill an animal, call it “sacrificing”. On the rare occasions she had to kill a fish (mostly she just took a tissue sample—the fish were hard to get and no way could she afford the loss of one) she wrote it up as such. She also explicitly wished you to note that she has “died”. She has not “passed away”, she has not “passed”. She said that’s bad zoology.

The people she touched loved her and valued her. When we started going out I noticed that I kept getting the “are you good enough for our Didee” hard stare from her friends. And her cat. Apparently I passed muster.

Diana described herself as a scientist and an artist. She was intensely interested in the world; in history, including archaeology, biology, genetics, medicine, space, ecology and lots, lots more. But also beauty, in art, music and literature. She was an avid reader: of science fiction & fantasy, historical novels and steampunk, whodunits and thrillers, biographies and cookbooks.

Diana was a designer, and a maker. She learned enamelling, welding, and wood-turning. She took up silver jewellery and made amazing stuff, then moved on to painting, and dyeing, and paper making, and silk painting and picture framing and so many other things. She was working in acrylics and surrounded by her work when she suffered her stroke.

She became interested in genealogy, and got me interested too, and now has thousands of people in her family tree, with the meticulous care of a trained researcher and scientist. She often complained of sloppy genealogists co-opting people from her tree where she KNEW the link was wrong, or putting poor quality information up.

She rode a motorcycle, and was associated with the Vincent Owners Club, despite never owning or even riding (as far as I know) a Vincent. Since we both rode them, we went on honeymoon on our motorcycles. Diana eventually traded up to a BMW, while I retained my lowly Suzuki. When we started a family, and Diana found it difficult to ride with a bulge (Andrew), I ‘inherited’ the use of that BMW, which I still ride to this day, and have been and am proud to say that I ride Diana’s motorcycle.
She was also a good car driver, and while far from being a petrol-head, liked a responsive car, with good tyres (a lesson from riding a motorcycle).

She loved music: folk music and classical, pop, prog-rock and more. When we married, our record collections had a huge amount of overlap, especially the folk section. She played the flute, until the dystrophy made that impossible. She also had a lovely singing voice.

Diana loved food, and cooking, and recipes, and bread-making. She said she taught a succession of flatmates basic cooking skills out of self-defence. For many years, she made the communion bread for St Barnabas, so people could have ‘proper’, fresh bread rather than wafers.
We both love cheese, and we used to go out on a Friday night and try different cheeses, which we rated and kept a record of in a notebook. Only two cheeses ever rated 5 stars (a Stilton and a Gorgonzola). We gave at least one cheese a negative star rating. Similarly, we tried single shots of various liqueurs (two a week, half each) to discover which we liked and did not. Fortunately our tastes in cheese and liqueurs matched.
Later, when her IBS made things tricky, she of course researched to find out what she COULD eat. When she discovered that it wasn’t gluten but wheat that was a problem for her, she experimented with different flours for bread. Then, when she discovered that sourdough’s slow fermentation eliminates the problematic FODMAP sugars, we were both delighted, and she took to making her own sourdough.

A huge amount of stuff in St Barnabas is directly from Diana. Not just the art, but also the practical things she adored, like designing and making the platform that hangs from the ceiling, and the board that holds the name tags.

She loved gadgets, and tools, as long as they were good quality and useful.She was good at auctions and often found great things there. We both loved power tools, and our idea of the toyshop was a hardware store. We couldn’t find an appropriate modern drawer handle for our bedroom drawers, so she arranged to have a nice old one copied by a brass foundry. She loved DIY, including plastering, which she got good at. Unlike me, she had great hand-eye coordination, and could put a draughtsman’s mapping pen back together without breaking it.

While not herself a sporty person, Diana enjoyed watching golf and tennis, although she never played golf and only played tennis when she was young. She did do fencing at college (poking people with things, not digging holes).

She loved gardens, and gardening until she found it physically too much. She was particularly good at knowing how tall things would grow and where to plant them so they would look right when mature, and otherwise designing gardens. She loved flowers, she would take them from the garden, and latterly she would buy a bunch to brighten the house.

Diana had a wonderful sense of humour, and loved comedy, especially Flanders and Swann, the Goons, Monty Python and clever humour, along with Peanuts, Calvin & Hobbs and Leunig.

She loved photography, but not being in the picture! She said that one of the benefits of taking pictures was to avoid being in them. As you’d expect, she became increasingly good at it, and would carefully compose shots, and discard all but the right one. Early on, she taught me the most important part of photography—which was to take the picture! I have never forgotten that lesson.

She was joyfully involved in the church, practically helping, on PowerPoint, getting the radio mics working, as parish recorder, as vicar’s warden, on the board of Box Hill Close Trust, wherever she could help. She was active in the Diocese doing strategic administration, archiving, fundraising, statistics, data visualisation and analysis, photography, art and in so many other ways. When it got too exhausting and she decided to retire, the Diocese awarded her the Bishop’s Medal for her services.

We both hated moving house, so after marrying in December, we lived in Diana’s flat, then went house hunting, and took vacant possession of 35 Crofton Road on April Fool’s day (as Diana put it) a little under 4 months later. And there we have stayed. When we were bidding on the house, we had a top price—and a secret little bit more, which was otherwise earmarked for upgrading the stereo. As it turned out, we didn’t have to break into the emergency reserve and duly upgraded the stereo, with the speakers that are with us yet.
Over the years, we remodelled the house and changed things extensively, always with Diana’s meticulous planning and great feel for design, especially in the garden.

It was Diana’s nature to help out and get involved throughout her life. She helped at Ngaio School, went on the board there, and then became involved with the School Trustees Association as newsletter editor. She had a number of hard things to say about the quality of the text she had to edit into acceptable form.

She loved Wellington, the hills and the greenery, and especially the sea. She loved the beach and the sea in all its moods—and she loved poking about in rock pools. A few weeks ago, she said that she loved being where she was, and wouldn’t want to move. She enjoyed thunder and lightning, and it is entirely appropriate that the heavens put on a show for her on her last weekend.

She loved the bush, and rivers and streams, and she loved Kuratau—the peacefulness and the beauty. She enjoyed kayaking on the lake when she still could, and she always was thinking of how to remodel and improve.

She loved nature, but was especially fond of butterflies, frogs, owls, dragons and dragonflies. Our cats loved her.

Diana was more of a digital native than most of us. Despite eschewing “social media”, she kept her life organised with her phone: when to take pills; when to pay bills; when to meet friends; when to do exercises; when to research things. So many things, so many categories, so many notes. Diana stayed in control of her life, while having absolutely no interest in controlling other peoples’, though she did express frustration with others’ disorganisation at times.

Diana was cheerful, and optimistic, and made the best of things, and expected and hoped those around her would do the same. And being around her, you tended to do just that. Diana never gave up, her will power was amazing, but she was nevertheless prepared. That was who she was.

Diana was not defined by her ailments. She coexisted with muscular dystrophy and bone marrow failure, they were a part of her life and she lived life fully and joyfully.

Diana loved and was loved by her family: First by Bev & Pete and her grandparents and aunts, then her younger sisters; her husband, parents-in law, Joan, her nieces and nephews and her beloved sons, and now Arna. Diana was a happy person, who brought joy to those close to her.

Diana Newbery, Scotland, photographing heather
Diana in Scotland, photographing heather

Mark Newbery (younger son)

People say never meet your heroes, but that was difficult because I grew up with her. Thankfully it has never been a problem. Mum had a drive and curiosity that will inspire me for the rest of my life. For her there was always some new thing to learn, a new angle to pursue, a new medium to explore. She achieved a great many things in her life both for herself and for others.

Even with everything she was working on, mum was always looking out for us. She made sure we had the support we needed when we were sick, injured, or struggling, and she guided us to be good people who do what needs doing. I would not be half the person I am today without her.

Mum was also forever finding interesting things and sharing her discoveries with us. She had a lasting curiosity about the world and the many things that make it up. It was always a joy finding a new message about recent discoveries in palaeontology, genetics, medicine, or one of many other topics. Likewise with gadgets, art projects, and objects with interesting or beautiful patterns. From the grand to the subtle, there was, and is, always something to appreciate in the world.

Diana Newbery, Glastonbury Tor
Diana at Glastonbury Tor

Andrew Newbery (elder son)

Mark and Dad have already said some wonderful things about mum. I echo their words, but would also like to say a few of my own.

Firstly I want to thank everyone who has called, written, visited, sent flowers or food, and particularly I want to thank all of you who took the time to be here today. 

In moments of grief, these acts of kindness remind us of the compassion and love that surrounds mum, and all of us. On behalf of our whanau: thank you from the very bottom of our hearts. Words can’t do justice to what it all means to us. 

Even mum, after she got over the embarrassment of having so many people make a fuss over her, would be blown away.

As we go through the service today, you should know that mum pretty much planned the whole thing herself. She’d picked a bunch of hymns and readings. She’d left notes on where she’d like any donations to go. She wanted to make sure that everything was sorted out. 

As dad said, it’s impossible to sum a person up in a couple of lines. Even the three of us talking about different sides of her could never encapsulate the incredible person that she was. 

The closest we can get, without her here to tell her own story, is to reflect on the shared experience we all had with her – whether we knew her our whole lives, or for only a short while. All of our experiences with her, the small moments of love and friendship, might just begin to touch on the multifaceted, talented, intelligent, loving, generous, persevering individual that was my mum.

I wanted to focus on that last bit about perseverance for a moment. Mum wouldn’t have wanted me to focus on her illness (that would have been making a fuss), but I think it’s important to know that she was dealt some pretty appalling cards when it came to her health.

Despite that, mum never wanted pity. She barely wanted help! Even an offer to help out around the house was something I had to push for in the last few years. She didn’t ever want people to make a fuss or feel burdened. We never were – we were happy to give even just a little bit back to such an incredible person.

The reason I talk about mum’s perseverance is because I think it shows just how dedicated she was to getting the most out of life. Mum’s been sick longer than I’ve been alive, and yet she found the time and energy to work across the community and voluntary sector on our school board, providing IT services to that same school almost singlehandedly, working with her local church to the point where this whole room is filled with things she designed, created or arranged. 

She was a talented artist who could out draw almost anyone. When I was a kid, she would “help” me paint my model aeroplanes (a lot of it was just her)! She learned how to forge silver jewellery, designing and making pieces for her friends and family. She was a keen gardener, and knew pretty much any plant or animal by sight. If I was ever at a loss about what something was, 9 times out of 10 she’d immediately know. She was a talented and inquisitive cook, and we would often talk about recipes or techniques. I could go on and on – but the core point is that she never let anything get in the way of learning something, or applying herself to a new skill. If I should come to learn even a fraction of the skills and knowledge that she did, I should consider my life well lived.

When we were going through mum’s notes on the day she died, we came across a comment she’d put in her advance directive planning. In response to the question of what she wanted her family to know and remember there was a comment right at the top of the page “make the most of your lives xxxxxx”. 

I’d like to put that out to all of you today. If mum wanted anything it was that the people she loved would revel in life – in all of its ups and downs, its joy, confusion and sadness. To live as she did is to be honest with everyone, to never turn down a challenge, to never stop learning, and to be emotionally available for the people you love. If we all managed to do that, the world could be a pretty incredible place. 

Diana Newbery relaxing at the bach
Diana relaxing at the bach
Letter from Bishop Justin
Letter from Bishop Justin Duckworth which was read at the service.

Riley car, pre-WWII

My parents owned a Riley car, in which they toured New Zealand during the early 1950s. This would have been very much 2nd hand even then, so I can safely assume that it was a pre-WW II car. The body was pretty much falling apart, but the engine was fine. Dad told me that this decrepit looking car would happily pass new vehicles struggling up steep hills. Mum said that the passenger seat tended to creep forward, so that after a while she would end up sitting with her knees near her chin.

Eventually, dad was contacted by a man who had seen him driving the car around Wellington, and very much wanted to buy it. Dad pointed out the the body was in terrible condition, but the buyer was not worried. He had a Riley of a same or similar model, with a good condition body but a busted motor. All he wanted was the engine. So, dad sold it to him.

I found some pictures from 1950 of my parents, and the car. They are not very good pictures, but in case someone is interested, here they are.

I don’t know what model it is, maybe someone out there can tell from the photos.

Mum & Dad
Mum, and the best overall view of the car
That’s number plate 29-230, from around 1950.
Yes, there is a car in there.
Dad with the car

macOS Server 5.3

macOS Server 5.3 contains a few traps for the unwary—traps which don’t appear to be mentioned in the release notes

  1. It only installs on 10.12.4 (or later, one assumes). This is mentioned in the release notes, but not in the App store notes. NOTE: 10.12.3 and earlier are not supported.
  2. It will control a remote server running version 5.2 on macOS 10.12
  3. It will not control a remote server, running any version, on OS X 10.11!

This last point is a horrible gotcha! If you are running a server on a previous OS X version—such as because it is on older hardware which can’t be updated to macOS 10.12, and you update to sever 5.3 on another machine, you can no longer control/manage the server instance running on the El Capitan machine.

Server 5.2 and Open Directory

Server 5.2 has its own version issues, or rather Open Directory does.
Server 5.2 will happily run on 10.11 and 10.12. However, if you had a Master/Replica on OS X 10.11/Server 5.2, and you upgrade to a mixture of OS X 10.11/Server 5.2 and macOS 10.12/Server 5.2, the Master/Replica breaks, simply because Open Directory insists (for no good reason that I can see) that they be running the same OS X version!

Server 5.2 can control Server 5.3

If you have a system running Server 5.2, it will happily control remote instances of:

  • Server 5.2 on OS X 10.11
  • Server 5.2 on macOS 10.12
  • Server 5.3 on macOS 10.12
Target Manager
macOS Server 5.2 5.3
10.11 5.2 ✖︎
5.3 N/A N/A
10.12 5.2

Let’s Encrypt OS X Server

(Or, letsencrypt macOS Server if you prefer)

I have been using CACert as my free SSL certificate for some time now, and it’s fine, with one exception—CACert root certificates are not trusted by default by many systems, including most significantly, iOS and Andriod. That in turn means that I can’t retrieve email off my home server from a company provided iPhone, since the company mandated security profile demands SSL authentication.

Letsencrypt aims to address this problem (among others) with their free certificates, which are trusted by Android and iOS. However, Letsencrypt uses a highly automated system (to make things easy for the user) which originally did not support OS X (macOS).

I recently decided to revisit Letsencrypt and have indeed managed to get it to do what I want, albeit with some interesting discoveries along the way.

Measure Twice, Cut Once

Since I did not wish to blow up my existing home server, especially the current certificate, I decided to test things out in a Parallels virtual machine. So, I duly fired up Parallels and started a clean install of El Capitan.

Other things can go wrong

It failed. It said the installer image could not be verified. So I tied a backup image, and got the same result. So I tried a Yosemite install, and it failed with the same error.

A little research showed a possible reason, so I tried resetting the clock, but to no avail. Then I had a light bulb moment. The page says the date must be correct in order to install OS X, specifically the year, because if the date set is prior to the release of OS X, the error will trigger.” It turns out that it’s important not only that the date not be too far in the past, it can’t be too recent either. In particular, the current date is too recent to install older releases!

The solution is to decouple the clock from the Parallels virtual machine (Parallels will keep the virtual clock synchronised to the real machine’s clock) and then set the date back a year or so to a little after the release of the relevant operating system. Voilà! It installed.

I then ran the certbot certonly script in the VM and, after a little fiddling, got things installed.

The Real Thing (with the fiddling done)

The certbot page for Apache on OS X shows how to create the certificate for OS X. It doesn’t work—or at least not on OS X Server.

The problem is neatly explained in the file /Library/Server/Web/Config/apache2/httpd_server_app.conf in the comments at the top:

# macOS Server
# When macOS Server is installed and set up (promoted), this file is copied
# to /Library/Server/Web/Config/apache2/httpd_server_app.conf. Both macOS
# and macOS Server use the same httpd executable, but macOS uses the config
# file in /etc/apache2.httpd.conf while macOS Server’s Websites service uses
# this config file.

The $ certbot –apache command works on the file in the macOS config file, not the macOS Server config file.

The solution is to use the $ certbot certonly command, and then select webroot, as follows:


Place the files in /Library/Server/Web/Data/Sites/Default

Import the files into Server’s Certificates and all is good.

El Capitan and me, panic not

I wrote that I had experienced a panic at boot in El Capitan, and that I was hanging off reinstalling some software until I had found the problem.

I found the problem.

I had cause to reboot the system, and it hung again at the boot screen

So, I rebooted in Single User mode (Command-S) and this time I looked closely at the screen.

Enter com_eltima_async_Navel::start(this=<ptr>,provider=<ptr>).
panic(cpu 0 caller 0xffffff80017d6a9a): Kernel trap at …

Debugger called: <panic>
Backtrace (CPU 0), Frame : Return Address

     Kernel Extensions in backtrace:

A little research pointed to Eltima’s SyncMate, which I had installed to sync an Android phone. I had removed it some time ago, but it had left behind a kernel extension, which hangs El Capitan at boot (sometimes. But once it’s started, it doesn’t seem to stop)..

I completely removed the vestiges of SyncMate, by removing the files/folders:

  • /System/Library/Extensions/EltimaAsync.kext
  • /Library/Application Support/EltimaSyncMate/

and all is now fixed.

Posted in Mac

El Capitan and me

I’ve installed OS X 10.11 (El Capitan) on three machines in the household, and while it’s just fine mostly, I have one—significant—problem and some things I’ve learned along the way.

OS X Server

Just before El Capitan arrived, Apple released OS X Server 5 (which was rapidly bumped to 5.0.4). This Server release brings a much welcomed change. Unlike previous versions it runs on both Yosemite and El Capitan. Previously, upgrading Server has been somewhat of a pain, since the machines running Server (both headless Mac Minis in my case) and the machine running Server simply as a console, have all had to be in lockstep. The console machine could not talk to a newer, or older, Server instance, and as soon as you upgraded OS X on any machine you had to upgrade Server on that machine as well. Essentially, that meant that you had to upgrade Mac OS X and OS X Server simultaneously on all machines. (The clients are OK: Server will work with them more or less regardless of their OS version).

Great! I was able to upgrade all three machines to the new version of Server in anticipation of the later upgrade to El Capitan.

The fragility of Open Directory

Alas, things were not quite so simple. OS X Server seems to have a long standing problem, where the Master and Replica OD instances get confused. In this case, the Master decided it didn’t have a Replica any more, and the Replica decided it couldn’t run OD. OD was always off, and if you turned it on it wouldn’t offer to create a new Master or join a Replica, it just turned itself off. However, it still worked (network users from the Master were still available on the Replica). So I ignored that, pending El Capitan.

I started by upgrading the Master Server to El Capitan. Which worked fine (took a little over 30 minutes). It then needed to upgrade OS X Server when I first ran Server again.

So, while Server 5.0 runs on OS X 10.10 and 10.11, it’s not quite the same thing. While this was going on, the Replica decided its (unacknowledged) Master had vanished and immediately forgot the network users! (It was prepared, now, to replicate a master or create a new Master).

After the El Capitan upgrade, OD Replication was still broken (Replica had the network users back but did not appear linked to Master), so I did what I’ve done before: forcibly remove the Replica and add it back to the master, using

sudo slapconfig -destroyldapserver diradmin

But, when I tried to add the Replica, it refused, saying that the OS X versions of the Server had to be the same!

So, lesson learned. All the Open Directory servers have to be running the same OS X version.

Which raises the question: WHY? Is this really necessary? It’s extremely irritating!

I upgraded the Replica server to El Capitan (which is also running O3X ZFS, so I was prepared for trouble), fortunately without incident (including the ZFS upgrade), and all is now fine with my servers.

El Capitan: Mysterious Hangs at Boot time

I then upgraded the main machine to El Capitan. I had some software that I was a little concerned about (Adobe CS3) but the collective wisdom of the web seemed to indicate that it was OK, so I went ahead.

Incompatible Software

The upgrade went fine, with only a few items put into the “Incompatible Software” folder:

  • GlimmerBlocker (LaunchDaemon and PrefPane)
  • GPGMail.mailbundle
  • WacomTablet.prefPane

I don’t care about the Wacom Tablet. GPGMail and GlimmerBlocker claim to be OK with El Capitan, so I reinstalled the latest versions

BOINC also would not run and asked to be re-installed (as is usual for BOINC after an OS X upgrade).

Reboot to hung screen

Then I restarted, and the machine hung.

It sits at the Apple boot screen with the progress bar at zero (no pixels of progress at all).

I restarted it several times with the same result. I restarted (Command R) into recovery mode and ran Disk First Aid. This worked and reported no problems.Then I restarted again.

It hung at the Boot Screen again.

I restarted with Verbose mode (Command V) and Single User (Command S), and it showed a Panic (but not a Kernel Panic) and stopped. Single User mode would not accept typed input.

So I reinstalled El Capitan from the Recovery Boot, which worked. I noted that it removed GlimmerBlocker, again. I put it back.

I put this down to a one off until the machine restarted (for reasons unknown) and returned me to the same hung boot screen. With the same symptoms (can boot into Recovery; Disk First Aid shows no issues; Panic in Single User Mode). I have resolved the problem the same way, by a reinstall. And I’m typing this Blog using that machine.

However, I’ve not reinstalled GlimmerBlocker, or BOINC, or GPGMail, or anything else that stopped working and asked to be reinstalled). We’ll see if it continues to work and if so I’ll consider adding back items one by one.

To be continued…

Fix for Time Machine “Backup verification incomplete!”

I was getting some issues with Time Machine, where, after backing up, it would always attempt a verification, and then complain that the verification was incomplete. These messages were only visible in the system log—there was no alert popped up.

Sep  9 08:37:30 XXXXX.local[72558]: Verifying backup disk image.
Sep  9 08:37:34 XXXXX.local[72558]: Backup verification incomplete!

The backup is to an OS X Server, and the TM backup is kept in a disk image, called Machine-Name.sparsebundle.

I thought that I would manually verify the backup and opened up Disk Utility. There I noticed that the Machine-Name.sparesebundle was already in the sidebar, even though the remove volume was not mounted. I then noticed that the path to the volume was

/Root Volume Name/private/var/db/


Closer investigation showed that /private/var/db/ contained a slightly modified copy of an out of date version of the Time Machine disk image.

% sudo ls -lhFG /private/var/db/
total 24
-rw-r--r--  1 root  wheel    11B  5 Jul 22:18 HC.progress.txt
-rw-r--r--  1 root  wheel   500B  5 Jul 22:15 Info.bckup
-rw-r--r--  1 root  wheel   500B  5 Jul 22:15 Info.plist
drwxr-xr-x  3 root  wheel   102B  5 Jul 23:49 bands/
-rw-r--r--  1 root  wheel     0B  5 Jul 22:15 token

Looking closely at this revealed that the disk image was corrupted, so I simply removed it

% sudo rm -rf /private/var/db/

and then did a manual verification (hold down option while selecting the Time Machine menu and choose Verify Backups). When the verification finished (successfully), the directory was left empty.

So, in summary, if you end up with the “Backup verification incomplete!” message, try deleting the /private/var/db/ and see if that fixes it.

rubycocoa + rvm + Mavericks fixed!

As I wrote previously, rubycocoa did not work properly with Mavericks.

Well, I’m very pleased to discover that it’s been fixed, with a new version of rubycocoa available at SourceForge.


% ./testRubyCocoa.rb
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require’: cannot load such file — osx/cocoa (LoadError)
   from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require’
   from ./testRubyCocoa.rb:9:in `<main>’


% ./testRubyCocoa.rb
Module RubyCocoa awakes!

testRubyCocoa.rb is:

#!/usr/bin/env ruby
require "osx/cocoa"
include OSX
OSX.ns_import :NSString

module TestRubyCocoa
   puts "Module RubyCocoa awakes!"