Centos 7.7 - Frequent kernel panics on long running I/O processes?

Issues related to applications and software problems
andrewc24
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Joined: 2019/11/12 11:31:36

Re: Centos 7.7 - Frequent kernel panics on long running I/O processes?

Post by andrewc24 » 2019/11/15 16:03:13

Is it possible to downgrade kernel?

Our older systems use (and work without issue):

3.10.0-862.14.4.el7.x86_64

Newer uses:

3.10.0-1062.4.1.el7.x86_64

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TrevorH
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Re: Centos 7.7 - Frequent kernel panics on long running I/O processes?

Post by TrevorH » 2019/11/15 16:25:01

Are you able to recreate this in a testing setup?

You should try to narrow down when the problem starts happening. If you say you know it works on the 3.10.0-862 series of kernels then it's quite likely that it will work on any of the same series - all -862 kernels are part of 7.5. You should also try the first 7.6 kernel which would have been 3.10.0-957.el7.x86_64 and see if it is broken there. Red Hat tend to make more changes at point release time than in the bugfix kernels that come out during the point release so if the first 7.6 kernel works then it's more than like that it'll work on the latest -957 kernel too. The newer the kernel that you can backlevel to, the better as it will mean missing fewer security updates.

You should already have multiple kernels installed unless you started from the 7.7 iso image. You can either choose a different one from the grub menu or, if it's not installed, then you'll need to enable the relevant vault repos for the point release whose kernel you want to use. Run yum repolist all and you'll see a bunch listed called things like C7.6.1810-base and updates. Use e.g. --enablerepo=C7.6.1810-{base,updates} to enable the 7.6 base and updates repos and try to yum list kernel-3\* to see what the available versions are. You may also need to add the switches --noplugins and also --showduplicates for the list to see more than just the current one.

If you test the last -862 kernel, the first -957 one and if that works, the last -957 one and the first -1062 one then you should have a good idea of when it broke. I suspect it's more likely to break on the point release kernel but it may be one of the intervening updates too. By testing the first and last in each series you can see when the bug was introduced.
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andrewc24
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Joined: 2019/11/12 11:31:36

Re: Centos 7.7 - Frequent kernel panics on long running I/O processes?

Post by andrewc24 » 2019/11/17 14:57:49

Thanks Trevor!

Kernel checks are next on my list of areas to check, I have a few bootable USB's ready to go...so can image a few systems and see what gives. :D

This information is good, appreciated.

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