[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.89' (ECDSA) to the list of known hosts.
syzkaller login: [   59.850284] IPVS: ftp: loaded support on port[0] = 21
executing program
[   59.998150] F2FS-fs (loop0): Found nat_bits in checkpoint
[   60.044399] F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
[   60.102947] ------------[ cut here ]------------
[   60.107756] kernel BUG at fs/f2fs/node.c:2780!
[   60.112454] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   60.117800] Modules linked in:
[   60.120977] CPU: 0 PID: 7983 Comm: syz-executor128 Not tainted 4.14.304-syzkaller #0
[   60.128824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
[   60.138152] task: ffff888096968080 task.stack: ffff8880b3218000
[   60.144218] RIP: 0010:destroy_node_manager+0x4f4/0x780
[   60.149553] RSP: 0018:ffff8880b321f7b0 EFLAGS: 00010297
[   60.154885] RAX: ffff888096968080 RBX: ffff8880b3041330 RCX: dffffc0000000000
[   60.162125] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b3041354
[   60.169443] RBP: ffff8880b3041240 R08: ffffffff8b9a7198 R09: 000000000004058f
[   60.176774] R10: ffff888096968930 R11: ffff888096968080 R12: ffff8880b3041358
[   60.184021] R13: ffffed1012cf81d6 R14: ffff8880b3041330 R15: ffff8880967c0e80
[   60.191266] FS:  0000555555ee4300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
[   60.199458] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.205316] CR2: 00007f3a82e08140 CR3: 0000000008e6a000 CR4: 00000000003406f0
[   60.212652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   60.219913] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   60.227172] Call Trace:
[   60.229764]  ? build_node_manager+0x1d50/0x1d50
[   60.234439]  ? trace_hardirqs_on+0x10/0x10
[   60.238727]  ? debug_object_activate+0x292/0x490
[   60.243499]  ? mark_held_locks+0xa6/0xf0
[   60.247591]  ? _raw_spin_unlock_irqrestore+0x79/0xe0
[   60.252721]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   60.258160]  ? debug_object_active_state+0x236/0x330
[   60.263339]  ? mark_held_locks+0xa6/0xf0
[   60.267372]  ? _raw_spin_unlock_irqrestore+0x79/0xe0
[   60.272646]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   60.277730]  ? _raw_spin_unlock_irqrestore+0x66/0xe0
[   60.282803]  ? debug_object_active_state+0x236/0x330
[   60.287876]  ? debug_object_free+0x320/0x320
[   60.292269]  ? lock_acquire+0x170/0x3f0
[   60.296217]  ? mark_held_locks+0xa6/0xf0
[   60.300426]  ? check_preemption_disabled+0x35/0x240
[   60.305469]  ? __call_rcu.constprop.0+0x245/0x7d0
[   60.310286]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   60.315278]  ? f2fs_drop_inode+0x7f0/0x7f0
[   60.319512]  ? destroy_inode+0xb9/0x110
[   60.323494]  ? iput+0x458/0x7e0
[   60.326751]  ? f2fs_show_options+0xdf0/0xdf0
[   60.331136]  f2fs_put_super+0x3e1/0x840
[   60.335269]  ? f2fs_quota_off_umount+0xb0/0xb0
[   60.339834]  ? dispose_list+0x1e0/0x1e0
[   60.343805]  ? fsnotify_unmount_inodes+0x1b4/0x210
[   60.348709]  ? f2fs_quota_off_umount+0xb0/0xb0
[   60.353288]  generic_shutdown_super+0x144/0x370
[   60.357936]  kill_block_super+0x95/0xe0
[   60.361891]  deactivate_locked_super+0x6c/0xd0
[   60.366445]  deactivate_super+0x7f/0xa0
[   60.370410]  cleanup_mnt+0x186/0x2c0
[   60.374103]  task_work_run+0x11f/0x190
[   60.377983]  do_exit+0xa44/0x2850
[   60.381426]  ? __do_page_fault+0x571/0xad0
[   60.385637]  ? mm_update_next_owner+0x5b0/0x5b0
[   60.390283]  ? lock_downgrade+0x740/0x740
[   60.394409]  do_group_exit+0x100/0x2e0
[   60.398291]  SyS_exit_group+0x19/0x20
[   60.402075]  ? do_group_exit+0x2e0/0x2e0
[   60.406129]  do_syscall_64+0x1d5/0x640
[   60.410012]  entry_SYSCALL_64_after_hwframe+0x5e/0xd3
[   60.415192] RIP: 0033:0x7f3a82d8f9f9
[   60.418940] RSP: 002b:00007ffd721166a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   60.426629] RAX: ffffffffffffffda RBX: 00007f3a82e0a330 RCX: 00007f3a82d8f9f9
[   60.433873] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
[   60.441201] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f3a82e04e40
[   60.448440] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3a82e0a330
[   60.455695] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
[   60.462958] Code: 40 6c 00 00 00 00 48 81 c4 d8 03 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 6a 38 89 fe 0f 0b e8 63 38 89 fe 0f 0b e8 5c 38 89 fe <0f> 0b e8 55 38 89 fe 0f 0b e8 4e 38 89 fe 48 8b 7c 24 28 e8 74 
[   60.482030] RIP: destroy_node_manager+0x4f4/0x780 RSP: ffff8880b321f7b0
[   60.488896] ---[ end trace ffbf12a7b52b6fd5 ]---
[   60.493647] Kernel panic - not syncing: Fatal exception
[   60.499147] Kernel Offset: disabled
[   60.502770] Rebooting in 86400 seconds..