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. > Thanks, > Miklos
