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Concerning Kernel messages in the log [SOLVED]
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LIsLinuxIsSogood
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PostPosted: Thu Aug 22, 2019 9:47 pm    Post subject: Concerning Kernel messages in the log [SOLVED] Reply with quote

I am not sure the cause, but have noticed some very weird stuff (like messages starting with pstore...starting with Using compression at and decompression failed, when I really don't know what that is referring to.) Please help, specifically I would like to know what this means?

Code:
[    4.966045] pstore: Using compression: deflate
[    4.966530] pstore: crypto_comp_decompress failed, ret = -22!
[    4.966531] pstore: decompression failed: -22
[    4.966766] pstore: crypto_comp_decompress failed, ret = -22!
[    4.966766] pstore: decompression failed: -22
[    4.967075] pstore: crypto_comp_decompress failed, ret = -22!
[    4.967076] pstore: decompression failed: -22
[    4.968289] pstore: crypto_comp_decompress failed, ret = -22!
[    4.968289] pstore: decompression failed: -22


Full dmesg output
http://dpaste.com/1JK1MKQ


Last edited by LIsLinuxIsSogood on Fri Aug 23, 2019 5:46 am; edited 1 time in total
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Section_8
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PostPosted: Fri Aug 23, 2019 3:08 am    Post subject: Reply with quote

I have no experience with this, but just from searching, i think this is related to kernel persistent storage - https://lwn.net/Articles/434821/ It looks like this is intended for debugging kernel crashes that occur before anything can be logged to disk. Do you have CONFIG_PSTORE set in your .config?
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LIsLinuxIsSogood
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PostPosted: Fri Aug 23, 2019 5:42 am    Post subject: Reply with quote

Thanks for the link i read it and that makes a lot of sense, although it was written way back in 2011 it looks like just at the start of the move to EFI. In my case since all my Gentoo hosts are running EFI firmware I think that some particulars mentioned in the article are going to be a bit outdated in that article, so I was wondering if anyone else might jump in and explain these error messages need to just be disregarded for now, or whether I might want to do something about it.

Of course would also be nice to know if the feature is working :) ha ha

Code:
$ mount | grep pstore
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)


Here is what I found when I looked for it in the mounts list, and then after navigating to /sys/fs/pstor found a long list of files there, so it seems like this feature is working still not quite sure what are these error messages all about?
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LIsLinuxIsSogood
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PostPosted: Fri Aug 23, 2019 5:46 am    Post subject: Reply with quote

Marking as solved, I just found an article explaining the issue it has to do with the pstore mount being unable to decompress some of the very old crash logs on my system... thinking I'm going to remove all the old logs and see if that takes care of the message.
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