It looks like you’ve already done some good debugging. The issue you’re seeing really does line up with the known kernel bug related to swap files on btrfs. Since you’ve already confirmed the patch (f3a5367c679d...) isn’t included in your current kernel version, the most practical short-term workaround is what you’ve already done: disable swap on btrfs.
Two options moving forward: 1- Move your swap to a separate partition (non-btrfs) to avoid hitting this bug. 2- Install a newer kernel (from mainline builds or when Ubuntu backports the patch) where this fix is included. Also, just like I use tools such as Youtify to test and compare versions of apps across devices before updating ( recently tried it on PC from https://youtifymod.com/for-pc ), you could do something similar here by testing with the mainline kernel to confirm whether the patch solves your issue before Ubuntu integrates it. That way you’ll know for sure if it’s fixed upstream. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2080039 Title: Kernel BUG: Bad page state in process kswapd0 Status in linux package in Ubuntu: Fix Released Status in linux source package in Noble: Fix Released Bug description: Since installing 24.04 two months ago, I've experienced a few random full-system freezes that required a hard-reset to recover. Up until now, I was not able to find the cause - plugging in a monitor to the system would just display nothing, and the journal logs would just stop abruptly. My first instinct was bad memory, so after it happened last week I ran memtest for several hours, but it did not find any memory errors. However I now believe I have found the actual cause, because it just happened again and luckily this time the journal saved the start of a kernel BUG message: BUG: Bad page state in process kswapd0 pfn:3f053e page:000000000f35bcf8 refcount:0 mapcount:0 mapping:000000000e24c844 index:0x2bcbd pfn:0x3f053e aops:btree_aops [btrfs] ino:1 flags: 0x17ffffc0000008(uptodate|node=0|zone=2|lastcpupid=0x1fffff) page_type: 0xffffffff() After some digging, I found this kernel bug report: https://lore.kernel.org/lkml/CABXGCsPktcHQOvKTbPaTwegMExije=Gpgci5NW=hqoro-s7...@mail.gmail.com/ that appears to describe the exact same bug (I am also using btrfs as the root partition, and my swap file is also on that btrfs filesystem). Then I also found this kernel patch: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f3a5367c679d31473d3fbb391675055b4792c309 that appears to be a fix for the above bug. To try to check if this fix is present in my kernel (no idea if this is valid), I installed the linux-source package, extracted the archive in /usr/src/linux-source-6.8.0, and checked the file modified by the patch mentioned above - and the changes do not appear to have been made. So if the patch has not been applied, could this please be done? If it has actually been applied, then this is some other bug and I need to do more investigation... For the time being I have disabled swap to hopefully try and avoid the crash. # uname -a Linux server 6.8.0-41-generic #41-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 2 20:41:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux # cat /proc/version_signature Ubuntu 6.8.0-41.41-generic 6.8.12 # lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.1 LTS Release: 24.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2080039/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
