2024年8月24日(土) 0:07 Piotr Oniszczuk <piotr.oniszczuk@xxxxxxxxx>: > > > > > Wiadomość napisana przez Matthew Wilcox <willy@xxxxxxxxxxxxx> w dniu 23.08.2024, o godz. 15:13: > > > > I wouldn't be surprised if this were dodgy ram. > > > Well - that was my initial hypothesis. > > in fact i had few of them. Ranked (and ordered) like this: > 1. downstream kernel patches > 2. hw (ram) issue > 3. kernel bug > > So full history was: > -build myself archlinux 6.10.2 kernel; upgrade builder OS (only kernel; nothing else) > -run normal devel process and (to my surprise) discover interrupted CI/CD builds by kernel oops > -downgrade to 6.8.2 and done 4 full builds (full takes 8..9h of constant 12c/24/t compile). all good. > -prepare vanilla 6.10.6 (to exclude potential downstream (ArchLinux) root causes) > -run normal devel process and still discover oops > -make sure hw is ok by week of test with 6.8.2 (recompiling for 3 architectures on 4 OS (3 in kvm). This was almost 5 full days of 12c/24 compiling. All good > -because last steep was all good - decide to go to you :-) > > sure - this is possible that 6.8.2 had luck with my ram and 6.10.6 had no luck….but i personally don’t believe this is a case…. > > btw: we can go with elimination strategy. > So what i need to change/disable to be closer to finding root cause? > swap? > now it is swapfile on system nvme > > Hello, I’m encountering a similar crash and trace in the issue I posted on Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=219154 If this is the same issue caused by virtio_net corrupting memory, you should be able to reproduce the crash by sending data to the VM over virtio interface while it is actively allocating memory (e.g., using iperf3 -s on the VM and running iperf -c from another host). In my case, as Thorsten suggested, reverting bisected commit f9dac92ba908 (virtio_ring: enable premapped mode regardless of use_dma_api) along with two related commits in this series resolved the issue: https://lore.kernel.org/all/7774ac707743ad8ce3afeacbd4bee63ac96dd927.1723617902.git.mst@xxxxxxxxxx/
