On Thu 14-03-19 08:23:10, Pankaj Suryawanshi wrote: > > Below is the Error Msg : > > [ 24.718792] page dumped because: VM_BUG_ON_PAGE(PageLRU(page) || > PageUnevictable(page)) > [ 24.726949] page->mem_cgroup:bd008c00 > [ 24.730693] ------------[ cut here ]------------ > [ 24.735304] kernel BUG at mm/vmscan.c:1350! > [ 24.739478] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Just curious. Which kernel version is that? Are there any addional patches applied on top of vanilla? > Solved the issue by below patch. > > > diff --git a/mm/vmscan.c b/mm/vmscan.c > index be56e2e..2e51edc 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -990,15 +990,17 @@ static unsigned long shrink_page_list(struct list_head > *page_list, > page = lru_to_page(page_list); > list_del(&page->lru); > > if (!trylock_page(page)) { > goto keep; > } > > VM_BUG_ON_PAGE(PageActive(page), page); > > sc->nr_scanned++; > > if (unlikely(!page_evictable(page))) > - goto activate_locked; > + goto cull_mlocked; > > if (!sc->may_unmap && page_mapped(page)) > goto keep_locked; > @@ -1331,6 +1333,12 @@ static unsigned long shrink_page_list(struct list_head > *page_list, > } else > list_add(&page->lru, &free_pages); > continue; > +cull_mlocked: > + if (PageSwapCache(page)) > + try_to_free_swap(page); > + unlock_page(page); > + list_add(&page->lru, &ret_pages); > + continue; > > activate_locked: > /* Not a candidate for swapping, so reclaim swap space. */ > > > > > From: Pankaj Suryawanshi > Sent: 14 March 2019 13:23:53 > To: linux-kernel@vger.kernel.org > Cc: minc...@kernel.org > Subject: vmscan: Reclaim unevictable pages > > > > Hello , > > shrink_page_list() returns , number of pages reclaimed, when pages is > unevictable it returns VM_BUG_ON_PAGE(PageLRU(page) || > PageUnevicatble(page),page); > > We can add the unevictable pages in reclaim list in shrink_page_list(), > return total number of reclaim pages including unevictable pages, let the > caller handle unevictable pages. > > Regards, > Pankaj > > ************************************************************************************************************************************************************* > eInfochips Business Disclaimer: This e-mail message and all attachments > transmitted with it are intended solely for the use of the addressee and may > contain legally privileged and confidential information. If the reader of > this message is not the intended recipient, or an employee or agent > responsible for delivering this message to the intended recipient, you are > hereby notified that any dissemination, distribution, copying, or other use > of this message or its attachments is strictly prohibited. If you have > received this message in error, please notify the sender immediately by > replying to this message and please delete it from your computer. Any views > expressed in this message are those of the individual sender unless otherwise > stated. Company has taken enough precautions to prevent the spread of > viruses. However the company accepts no liability for any damage caused by > any virus transmitted by this email. > ************************************************************************************************************************************************************* -- Michal Hocko SUSE Labs