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You could say that updates are the cause and the solution of all software problems.
Who is calling ps? With ps -ef we can see the PPID, the parent process id, to track down who spawned this process.
QNX know-how becomes harder and harder to acquire, open source software for modern QNX releases is essentially non-existent and the driver situation is a catastrophe.
But we know that the system has hyperthreading and only has one physical core, so the real load is actually more like 100%.
Does the ps bug still exist in QNX ecosystems more recent than QNX 6.6? Most likely, yes.
Other than that, the log looks clean, no errors that could explain this behaviour.
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So, a lot of update bug reports that find their way to me have nothing to do with the updater per se, they just manifest themselves immediately, giving the impression that the updater is broken.
Not the prettiest way to implement it, but it is legacy code that worked for many years.
I install my newly compiled ps, write some software to automatically test reboots in a loop overnight and am able to reproduce the problem with this custom ps binary.
The problem does not appear.
We see that the CPU load of the two cores is about 50%.
It was beautiful. Then QNX was bought, source code access was revoked and the community largely withered away.
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After this analysis, I'm quite sure that this 15 years old bug is still alive and well in our closed source binary.
In the logs, I see that the update installed successfully.
A new bug comes in: Update failed from version X to version Y, error getting log files from sensor.
We can only speculate, it must have been changes in the scheduling order or timing at boot time.
Nice! It works just like the closed source binary we have.
How did I fix it? I briefly considered shipping our own ps utility, but I was still unsure about other bugs that might potentially be fixed in the latest closed source binary, those fixes would be lost again if I revert to the old open source version.
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The thing about firmware updates is that by definition, every bug is caused by the updater because before installing the affected version, the bug was not present.
The device can barely handle simple commands.
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At this point, an intermezzo with some QNX history is in order.
The bug is a race condition, so it can rear its ugly head whenever it wants.
I also verify this hypothesis by halting the ps process in the debugger, killing the process whose threads we are about to inspect and resuming ps and it hangs in precisely the same way.
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People would experiment with the kernel, write various useful utilities and help each other in forums.
Maybe in a decade, an unfortunate soul runs into this bug again.
To me, it looks like ps is saturating the core completely, the kernel load is probably caused by whatever ps is doing.
Ironically, we use ps to debug this ps problem.
The QNX ecosystem is generally quite robust.
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Connecting to the system is difficult because it is laggy and slow.
Dare I say it: Do we have a ps bug on our hands?
Hurry up friends, the interest is huge!
Me neither! Let's dive right into the old code.
Why did this problem suddenly appear in our firmware?
I am responsible for the reliability of the firmware updates on our devices and this work never gets boring.
In the past, it almost always ended up being my own mistake when I suspected problems in QNX and its utilities.
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I connect to the machine and download all the logfiles.
The affected code was old and deployed in production for many years.
For each process, it loops through all the threads of this process, and the bug is that this loop has insufficient termination criteria (in other words, in some cases, it loops infinitely).
But how can the infinite loop seen in live assembly debugging be explained with a user error of ps?
But as luck has it, a co-worker encountered the problem and had the presence of mind to recognize it and leave the system undisturbed for analysis.
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After the reboot which starts the newly installed firmware, there were some minor problems: Some processes took a bit longer to start than expected.
This explains why the problem never reproduced on most systems, they have newer hardware.
The problem occurs when the process whose threads we want to inspect terminates right before ps enters this loop.
But I'm getting ahead of myself, so let's start from the beginning.
Let's hope this blog post will save them some trouble.
The QNX kernel is the most beautiful and interesting kernel I have ever had the pleasure of working with, but it lies in the shackles of corporate ownership.
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Our ps utility remains buggy as it is, but it's pretty much impossible to reproduce this bug in an interactive terminal, and our firmware no longer uses it.
Needless to say, this particular update problem never occurred again after that.
Do you think anyone has modified the source code of the ps utility throughout the last 15 years?
I try to install the affected Firmware version Y on various devices.
Equipped with the knowledge of which process is affected and analysing the logs to find out where this process got stuck, I quickly find the offending line of code.
QNX even had a fully featured Desktop GUI, ran Firefox and was self-hosting, so you could develop for QNX right on QNX itself with full IDE and compiler support.
In that case, the devctl() call fails and as you can see in the following simplified snippet, it will never terminate because the if-clause is never entered.
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Because it's not, they have to deal with the issue themselves.
Back then, QNX had a vibrant open source community.
Okay, we immediately have some clues here.
The old ps utility compiles for QNX 6.6 on the first try.
It looks like this: int rc = system( "ps -e | grep Foo" ); where Foo is some program whose presence we need to check.
Okay, so, ps gets stuck in an infinite loop.
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At the end of the day, I decided to comb through our code base and just eliminate the usage of ps in non-interactive code, there weren't that many instances.
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Back to the bug. So there is old QNX source code lying around.
After that, the user manually rebooted the machine and it worked again.
I also see that this code only gets executed on certain old hardwares.
Perfect! Now we can use the "Attach to Remote Process via QConn" feature again, but this time we have the source code of our ps.
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Questions were increasingly asked via private support tickets directly to QNX, locked away from the public.
Even on the old hardware, it is exceedingly rare and hard to reproduce.
For every process in the /proc directory, ps opens a file descriptor to this process' address space (as) file to read the process information to be displayed.
Killing the offending ps process, which loops infinitely otherwise, unblocks the system and restores normal operation.
A bit more than a decade ago, the QNX source code was available to the public.
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The root cause of the bug is the following.
Like this, I find that it was spawned by the shell sh, which in turn was spawned by one of our proprietary processes.
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If it was open source, I would fix it and send a pull request.
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The QNX kernel is doing a lot of stuff and so is ps.
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