On Wed, 12 Oct 2022 05:46:49 -0700 syzbot <syzbot+12320e263831dd4ddb91@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 2e30960097f6 bpf, x64: Remove unnecessary check on existen.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=15934fbc880000 > kernel config: https://syzkaller.appspot.com/x/.config?x=796b7c2847a6866a > dashboard link: https://syzkaller.appspot.com/bug?extid=12320e263831dd4ddb91 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1055b15c880000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1018112a880000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/f0f073bdb6eb/disk-2e309600.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6062312f63fe/vmlinux-2e309600.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+12320e263831dd4ddb91@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: use-after-free in __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 > Read of size 8 at addr ffff8880775905c8 by task syz-executor328/3786 > > CPU: 1 PID: 3786 Comm: syz-executor328 Not tainted 6.0.0-syzkaller-02744-g2e30960097f6 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:317 [inline] > print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 > kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 > __list_add_valid+0xa5/0xb0 lib/list_debug.c:30 > __list_add include/linux/list.h:69 [inline] > list_add_tail include/linux/list.h:102 [inline] > register_shrinker_prepared mm/vmscan.c:684 [inline] I trust that tree didn't have this fix? commit bd86c69dae65de30f6d47249418ba7889809e31a Author: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Date: Mon Oct 10 14:59:02 2022 +0900 NFSD: unregister shrinker when nfsd_init_net() fails
