[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ 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 '10.128.1.25' (ECDSA) to the list of known hosts. syzkaller login: [ 65.627906][ T6885] IPVS: ftp: loaded support on port[0] = 21 [ 65.632031][ T6881] IPVS: ftp: loaded support on port[0] = 21 [ 65.636802][ T6887] IPVS: ftp: loaded support on port[0] = 21 [ 65.652331][ T6888] IPVS: ftp: loaded support on port[0] = 21 [ 65.664748][ T6889] IPVS: ftp: loaded support on port[0] = 21 [ 65.672598][ T6886] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 76.892473][T10965] ------------[ cut here ]------------ [ 76.898034][T10965] ODEBUG: free active (active state 1) object type: rcu_head hint: 0x0 [ 76.906696][T10965] WARNING: CPU: 0 PID: 10965 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 [ 76.916554][T10965] Kernel panic - not syncing: panic_on_warn set ... [ 76.923174][T10965] CPU: 0 PID: 10965 Comm: syz-executor278 Not tainted 5.9.0-rc1-syzkaller #0 [ 76.931946][T10965] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.942025][T10965] Call Trace: [ 76.945343][T10965] dump_stack+0x18f/0x20d [ 76.949704][T10965] panic+0x2e3/0x75c [ 76.953646][T10965] ? __warn_printk+0xf3/0xf3 [ 76.958269][T10965] ? console_unlock+0x7f0/0xf30 [ 76.963154][T10965] ? __warn.cold+0x5/0x4a [ 76.967517][T10965] ? __warn+0xd6/0x1f2 [ 76.971626][T10965] ? debug_print_object+0x160/0x250 [ 76.976869][T10965] __warn.cold+0x20/0x4a [ 76.981153][T10965] ? debug_print_object+0x160/0x250 [ 76.986382][T10965] report_bug+0x1bd/0x210 [ 76.990761][T10965] handle_bug+0x38/0x90 [ 76.994954][T10965] ? __warn_printk+0xc6/0xf3 [ 76.999575][T10965] exc_invalid_op+0x14/0x40 [ 77.004112][T10965] asm_exc_invalid_op+0x12/0x20 [ 77.009002][T10965] RIP: 0010:debug_print_object+0x160/0x250 [ 77.014839][T10965] Code: dd 60 27 94 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 60 27 94 88 48 c7 c7 c0 1c 94 88 e8 42 36 a6 fd <0f> 0b 83 05 83 53 13 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 [ 77.034473][T10965] RSP: 0018:ffffc9000e327dd0 EFLAGS: 00010082 [ 77.040572][T10965] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 77.048571][T10965] RDX: ffff888094f1e5c0 RSI: ffffffff815dafc7 RDI: fffff52001c64fac [ 77.056563][T10965] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae620f8b [ 77.064558][T10965] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89bd6780 [ 77.072695][T10965] R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000 [ 77.080725][T10965] ? vprintk_func+0x97/0x1a6 [ 77.085358][T10965] debug_check_no_obj_freed+0x301/0x41c [ 77.090951][T10965] kmem_cache_free.part.0+0x16d/0x1f0 [ 77.096366][T10965] task_work_run+0xdd/0x190 [ 77.100910][T10965] exit_to_user_mode_prepare+0x195/0x1c0 [ 77.106685][T10965] syscall_exit_to_user_mode+0x59/0x2b0 [ 77.112284][T10965] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.118193][T10965] RIP: 0033:0x4469e9 [ 77.122113][T10965] Code: e8 8c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.141764][T10965] RSP: 002b:00007fe75cacfdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 [ 77.150207][T10965] RAX: 0000000000000000 RBX: 00000000006dbc48 RCX: 00000000004469e9 [ 77.158205][T10965] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000005 [ 77.166224][T10965] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 77.174222][T10965] R10: 0000000020000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 77.182242][T10965] R13: 00007ffeb17f4fcf R14: 00007fe75cad09c0 R15: 0000000000000000 [ 77.191566][T10965] Kernel Offset: disabled [ 77.196005][T10965] Rebooting in 86400 seconds..