On 2/7/25 11:55, Vlastimil Babka wrote: > On 2/7/25 11:43, Miklos Szeredi wrote: >> On Fri, 7 Feb 2025 at 11:25, Vlastimil Babka <vbabka@xxxxxxx> wrote: >> >>> Could be a use-after free of the page, which sets PG_lru again. The list >>> corruptions in __rmqueue_pcplist also suggest some page manipulation after >>> free. The -1 refcount suggests somebody was using the page while it was >>> freed due to refcount dropping to 0 and then did a put_page()? >> >> Can you suggest any debug options that could help pinpoint the offender? > > CONFIG_DEBUG_VM enables a check in put_page_testzero() that would catch the > underflow (modulo a tiny race window where it wouldn't). Worth trying. I typically run all of my tests with these options enabled https://github.com/bsbernd/tiny-qemu-virtio-kernel-config If Christian or Mantas could tell me what I need to install and run, I could probably quickly give it a try. Thanks, Bernd
