Hello, syzbot found the following issue on: HEAD commit: a804ab08 Add linux-next specific files for 20201006 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=17fe30bf900000 kernel config: https://syzkaller.appspot.com/x/.config?x=26c1b4cc4a62ccb dashboard link: https://syzkaller.appspot.com/bug?extid=ee250ac8137be41d7b13 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1336413b900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f7392b900000 The issue was bisected to: commit eede846af512572b1f30b34f9889d7df64c017d4 Author: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> Date: Fri Oct 2 21:17:35 2020 +0000 f2fs: f2fs_get_meta_page_nofail should not be failed bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10a8aafb900000 console output: https://syzkaller.appspot.com/x/log.txt?x=14a8aafb900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ee250ac8137be41d7b13@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: eede846af512 ("f2fs: f2fs_get_meta_page_nofail should not be failed") INFO: task syz-executor178:6870 can't die for more than 143 seconds. task:syz-executor178 state:R stack:26960 pid: 6870 ppid: 6869 flags:0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1179: #0: ffffffff8a554da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6242 1 lock held by systemd-journal/3920: 1 lock held by in:imklog/6769: #0: ffff88809eebc130 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 1 lock held by syz-executor178/6870: #0: ffff8880925120e0 (&type->s_umount_key#47/1){+.+.}-{3:3}, at: alloc_super+0x201/0xaf0 fs/super.c:229 ============================================= Kernel panic - not syncing: hung_task: blocked tasks CPU: 0 PID: 1179 Comm: khungtaskd Not tainted 5.9.0-rc8-next-20201006-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fb lib/dump_stack.c:118 panic+0x382/0x7fb kernel/panic.c:231 check_hung_uninterruptible_tasks kernel/hung_task.c:257 [inline] watchdog.cold+0x23e/0x248 kernel/hung_task.c:339 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
