On Thu, Sep 4, 2025 at 11:43 PM Viacheslav Dubeyko <Slava.Dubeyko@xxxxxxx> wrote: > By applying the patch [1], enabling CONFIG_DEBUG_VM, and returning -E2BIG from > ceph_check_page_before_write(), I was able to reproduce this warning: Thanks, I'm glad you could verify the bug and my fix. In case this wasn't clear: you saw just a warning, but this is usually a kernel crash due to NULL pointer dereference. If you only got a warning but no crash, it means your test VM does not use transparent huge pages (no huge_zero_folio allocated yet). In a real workload, the kernel would have crashed.
