On 8/3/21 4:24 PM, Kefeng Wang wrote: > > On 2021/7/29 22:03, Shakeel Butt wrote: >> On Wed, Jul 28, 2021 at 11:52 PM Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> wrote: >>> >>> On 2021/7/28 23:53, Shakeel Butt wrote: >> I don't have a strong opinion on this. Please send a patch with >> reasoning if you want WARN_ON_ONCE here. > > Ok, we met a BUG_ON(!PageCompound(page)) in kfree() twice in lts4.4, we are > still debugging it. > > It's different to analyses due to no vmcore, and can't be reproduced. > > WARN_ON() here could help us to notice the issue. > > Also is there any experience or known fix/way to debug this kinds of issue? > memory corruption? This would typically be a use-after-free/double-free - a problem of the slab user, not slab itself. > Any suggestion will be appreciated, thanks. debug_pagealloc could help to catch a use-after-free earlier > >> . >>
