Difference between revisions of "Notices"
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| + | :'''WHAT:''' Linux kernel bug causing some of our Fedora 31 lab systems to hang. | ||
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| + | :'''WHEN:''' First identified in CS, last week of January, 2020. '''''UPDATES below the DETAILS section...''''' | ||
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| + | :'''DETAILS:''' | ||
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| + | ::As you know, recently, we upgraded our lab Linux clients to Fedora 31. Over the past several days, we've discovered some odd behavior from some of the lab systems. Upon further investigation, we have learned that there is a kernel bug that is causing some systems to hang (requiring a reboot) when certain NFS operations are performed. (NFS is the system that allows our Linux clients to access the home directories, certain apps, other shared file systems.) | ||
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| + | ::We're seeing that the bug is documented and that it affects not only Fedora 31, but some prior versions as well. It just happens to be that we are seeing its effects now. | ||
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| + | ::This is a Linux kernel issue and there are Linux folk working on trying to get this bug patched, but we do not know how long it will take. | ||
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| + | ::In the meantime, CS IT is looking into work-arounds to bypass this bug as much as possible. | ||
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| + | ::There is no way to predict if or when this bug will cause a system to hang. Some of our systems may never notice it. We think it might happen to some systems that are heavily utilizing NFS operations, but again, we're not sure. | ||
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| + | ::Our recommendation is that when you're editing files, etc. save your work on a regular basis, just in case. This is a good practice to follow anyway. | ||
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| + | ::'''''IMPORTANT:''''' If you experience a system that hangs (and doesn't recover after several minutes), please email {{mailto|support}} to let us know the name of the system that experienced the hang, the time of the hang, and what activity you were doing on the system at that time (which will help us troubleshoot the problem further.) | ||
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| + | ::We will update here with our progress on circumventing this bug. | ||
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| + | ::'''UPDATE: 1/29/20''' We are applying alternative pre-bug kernels to those Linux clients that are available to be rebooted (to activate these kernels.) As more become available, we'll reboot them as well. We're hoping these alternative kernels will prevent the hangups until officially patched kernels become available. | ||
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| + | ::'''UPDATE: 2/7/20''' We have applied updates to most of our systems in order to activate the alternative pre-bug kernels, which we hope will prevent hangups. There are still some systems which have not yet had the alternative kernels applied, and that will happen as the systems become available for us to reboot. | ||
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Revision as of 20:01, 12 February 2020
SERVICE OUTAGES
UNPLANNED CS SERVICE OUTAGES
- None at this time.
PLANNED CS SERVICE OUTAGES
- None at this time.
CS COMPUTING LAB AVAILABILITY
- All CS computing labs available at this time.
AUDIO/VISUAL (A/V) OUTAGES
- None at this time.