It seems commit 12904d953364 caused the WARNING when MADV_COLLAPSE on shmem memory, but right now the root cause is still unclear to me after some digging. Will keep digging and/or try to repro over the weekend. On Fri, May 5, 2023 at 9:51 AM syzbot <syzbot+3d4aa0d3e784b29b1520@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > syzbot has bisected this issue to: > > commit 12904d953364e3bd21789a45137bf90df7cc78ee > Author: Jiaqi Yan <jiaqiyan@xxxxxxxxxx> > Date: Wed Mar 29 15:11:21 2023 +0000 > > mm/khugepaged: recover from poisoned file-backed memory > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14f67032280000 > start commit: 3c4aa4434377 Merge tag 'ceph-for-6.4-rc1' of https://githu.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=16f67032280000 > console output: https://syzkaller.appspot.com/x/log.txt?x=12f67032280000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c1d541e02d3faec > dashboard link: https://syzkaller.appspot.com/bug?extid=3d4aa0d3e784b29b1520 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d1973c280000 > > Reported-by: syzbot+3d4aa0d3e784b29b1520@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 12904d953364 ("mm/khugepaged: recover from poisoned file-backed memory") > > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
