Kernel 5.15.1 and bcache


Dunno if the category is right, but just a heads up about kernel 5.15.1 and bcache: LKML: Lin Feng: Re: [PATCH] bcache: fix NULL pointer reference in cached_dev_detach_finish

It has a serious nasty bug. If anyone is affected, there is no data loss ( I talk by experience :slight_smile: I was affected ) but there is some command line work to recover the filesystem and cache volume ( I was using btrfs ).

Anyway, just a heads up in case anyone is using bcache !


linux-zen-5.15.2.zen1-1  linux-zen-headers-5.15.2.zen1-1

Ah, is this why it took a while for 5.15 to land here? I had been wondering, then spotted it was .2 and wondered even more (but not enough to actually look into it yet).

I haven't tested 5.12.2 yet .... am a little affraid to test it since the source code for the affected driver is still the same ...

well, in a clear and successful attempt to show the world that I am a stupid idiot jackass.... after I said I wouldn't do it, I did it!

just one boot and reboot did it, didn't even had to login to the user account. so kernel 5.15.2 is still affected.

and this time I didn't even managed to save the data... had to resort to yesterday's backup.

gonna try with 5.15.3 :
-> kernel/git/stable/linux.git - Linux kernel stable tree

-> kernel/git/stable/linux.git - Linux kernel stable tree

seem patched with the fix to the error on the mailing list!

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only a few hours of uptime, but 5.15.3 seems to be good on bcache.

confirmed with linux-xanmod-tt-5.15.3

also .... bcache users can check the bcache-tools of gentoo's patch:

which adds bcache-status, which is very handy !

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