rcu_sched Error on Host Registration - PC Tablet w/ Dock
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@explosivo98 If you manually register this system with the FOG ui. In the host definition for this suspect system. In the kernel args, place the following kernel parameter
clocksource=hpetThen pxe boot that target computer again. This will change how the CPUs are metered for stall detection. -
@george1421 okay, and to be sure this goes under “Host Kernel Arguments”, correct?
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@explosivo98 Yes, I stated the name from memory. I was close but not exact.
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@george1421 haha I got you. I went ahead and added that argument but no change
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@explosivo98 Well nuts. One last thing I can find. Go ahead and remove the kernel parameter we just set. Lets roll back to 4.13. version of the linux kernel from here: https://fogproject.org/kernels/Kernel.TomElliott.4.13.4.64 Same process as before rename it to bzImage4136 . Place the file in /var/www/html/fog/service/ipxe directory then update the host definition boot kernel to bzImage4136
I’m finding references to a regression error introduced in linux kernel 4.17 that produces a similar error as you are seeing.
Just so you’re aware this isn’t specifically a FOG issue, but rather a linux kernel error. FOG uses a stock linux kernel as part of its FOS Linux OS.
One last thing I’m thinking of is to see if can get around this by forcing the 32 bit kernel to load. I might expect the same results, but you never know.
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There might be some odd BIOS setting that causes this, worth checking out. (or perhaps a BIOS update)
Might also be worth trying a Ubuntu live USB or something to see if that will work.
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Same results (black screen, no text) with the 4136 kernel. I looked through the BIOS and there’s not a ton of options to change, but I did try flipping a few of them on/off with no luck. 32 bit kernel looped back around to a dark version of the main FOG menu when I tried to choose compatibility mode, which was strange, but then trying to deploy an image I got a “Could not boot: Error 0x71048283” message three times before sending me to the iPXE command line.
I’m not sure if it matters but poking around in the BIOS reminded me that these things do support Android. There’s three options in the bios for “Droid Mode” “Android Mode” and “Windows Mode”, all of which are set to be disabled on the stock tablet except the Windows option which says “Windows 8.x”. I don’t know if that means the drives are partitioned in such a way that it would cause issues like this but that was about the only thing I found looking around in the BIOS for settings to change.
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Hey all, I’m doing a bit of thread necromancy here to ask if there’s ever been any breakthroughs on solving this particular error. These tablets are really the only thing in our arsenal that we still need to manually image with a Clonezilla drive and, well, everyone here loves the way Fog works now that we deploy 99% of our systems using it. I did try one of the newer kernels (4.19.64) for the heck of it but didn’t notice a difference. I wasn’t sure if there were any new experimental kernels to try that might help with this or what so I figured I’d ask.
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@explosivo98 Latest dev build is available here: https://dev.fogproject.org/blue/organizations/jenkins/fos/detail/master/115/artifacts
I don’t believe we have actively tried to hunt this particular bug down, but changes have been made to kernel configs and inits, so worth a shot! (so get both the bzImage and init.xz)
Only use these for testing those devices for now. Still some bugs to kill, but you should be able to see if you can deploy at least.
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@Quazz dang, no luck. This tablet is x64 so there shouldn’t be a need to try the 32bit kernel right? Or are there some cases where the x32 config worked when the x64 wouldn’t?
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@explosivo98 Can you test something. Manually register this tablet then in the host definition for that tablet in the kernel args field enter
acpi=offIn other threads I think that is where we ended up getting things to work here.Edit: Just quickly scanning the other threads I also see
tsc=unstablethe other one was where the processor had many cores (>8) we had to create a custom kernel with 64 set as the max core.
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@george1421 !! holy cow, that actually got me past the rcu_sched error! This is farther than I’ve ever gotten with this. Everything looked like it was going to work and I was ready to throw a party but it failed the getHardDisk check, it can’t detect the hard drive on here now for some reason. The storage on this is a Sandisk DF4064 which is an eMMC drive if that matters. I tried single disk resizable mode as well as multi partition non resizeable and neither worked. Running the compatibility test does show a Fail for the hard drive check as well. Are there special considerations I need to make when dealing with one of these drives?
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@explosivo98 What version of the FOS Linux kernel are you using?
Also which kernel parameter did the trick?
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@george1421 Looks like it was the ACPI toggle that did it, I switched back to the newest production kernel after getting it working on the newest dev build and it worked there so right now I’m using 4.19.64
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@explosivo98 OK so now that this point you are still stuck with the missing disk?
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@george1421 yeah I am, like I said I tried switching between some of the hard drive types but nothing made a difference, but I assume since running the compatibility test returns a similar error that it probably doesn’t have anything to do with that anyway.
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@explosivo98 Ok lets collect some data on 2 fronts.
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From a running Windows computer. Can you get the hardware IDs of that storage device. It will be in the device manager. I need both the vendor and device ID.
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This one will be a bit more involved. Reschedule a capture/deploy to that target computer, but before you hit the schedule task button, check the debug checkbox. Then pxe boot the target computer. After a few screens of text where you will have to clear with the enter key you should be dropped to the FOS Linux command prompt. At the fos linux command prompt key in
lsblkand post the output here (you may need to take a clear picture with a mobile phone to get what we need). Keep this session running because we may need you to look at a startup log file… while you are at it getting screen shots does this return anythinggrep /var/log/messages mc0orgrep /var/log/messages mmc?
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Doing a bit more research on this and there are several linux distros that have the same issue with this hardware. I did find a reference to it being fixed in Linux 5.3.x series. I have a one off kernel that I complied for working around the T2 chip in a 2018 mac that should be 5.3.(something)
https://drive.google.com/open?id=12St-Wix1io0s0oXhgxAuLlQOVoT9548L -
@george1421
hm, the hardware ID for this looks like it’s just a generic driver, it shows as SD\GenDisk in the device manager. I’m on the command prompt now but lsblk returns nothing and the grep commands returned “no such file” when ran.Edit: Trying the kernel now!
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@george1421 would I need a new init file for this as well or no? I tried rebooting with the same debug task in queue from last time and it just froze after loading (successfully) the init file. I rebooted with the task canceled and selected the system compatibility check option and it just went to a black screen after that.
