[  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 '10.128.1.44' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   40.521621][ T7003] IPVS: ftp: loaded support on port[0] = 21
[   40.553821][ T7003] netlink: 16 bytes leftover after parsing attributes in process `syz-executor446'.
[   40.597423][ T7003] ------------[ cut here ]------------
[   40.602913][ T7003] refcount_t: underflow; use-after-free.
[   40.609411][ T7003] WARNING: CPU: 1 PID: 7003 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0
[   40.618802][ T7003] Kernel panic - not syncing: panic_on_warn set ...
[   40.625366][ T7003] CPU: 1 PID: 7003 Comm: syz-executor446 Not tainted 5.6.0-syzkaller #0
[   40.633708][ T7003] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   40.643807][ T7003] Call Trace:
[   40.647086][ T7003]  dump_stack+0x1e9/0x30e
[   40.651419][ T7003]  panic+0x264/0x7a0
[   40.655295][ T7003]  ? __warn+0x102/0x210
[   40.659433][ T7003]  ? refcount_warn_saturate+0x15b/0x1a0
[   40.664956][ T7003]  __warn+0x209/0x210
[   40.668919][ T7003]  ? refcount_warn_saturate+0x15b/0x1a0
[   40.674439][ T7003]  report_bug+0x1ac/0x2d0
[   40.678750][ T7003]  do_error_trap+0xca/0x1c0
[   40.683232][ T7003]  do_invalid_op+0x32/0x40
[   40.687622][ T7003]  ? refcount_warn_saturate+0x15b/0x1a0
[   40.693197][ T7003]  invalid_op+0x23/0x30
[   40.697448][ T7003] RIP: 0010:refcount_warn_saturate+0x15b/0x1a0
[   40.703582][ T7003] Code: c7 64 03 d1 88 31 c0 e8 33 c6 b2 fd 0f 0b eb 85 e8 3a e9 df fd c6 05 50 26 b1 05 01 48 c7 c7 90 03 d1 88 31 c0 e8 15 c6 b2 fd <0f> 0b e9 64 ff ff ff e8 19 e9 df fd c6 05 30 26 b1 05 01 48 c7 c7
[   40.723174][ T7003] RSP: 0018:ffffc90001477d98 EFLAGS: 00010246
[   40.729261][ T7003] RAX: 1b6ebabe3044f400 RBX: 0000000000000003 RCX: ffff8880a96ec0c0
[   40.737216][ T7003] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[   40.745263][ T7003] RBP: 0000000000000003 R08: ffffffff815e07a6 R09: ffffed1015d26618
[   40.753218][ T7003] R10: ffffed1015d26618 R11: 0000000000000000 R12: ffff888095674040
[   40.761203][ T7003] R13: 0000000000000100 R14: ffff8880a9a7d208 R15: ffff888095674044
[   40.769199][ T7003]  ? vprintk_emit+0x2e6/0x3b0
[   40.773863][ T7003]  ? refcount_warn_saturate+0x15b/0x1a0
[   40.779389][ T7003]  free_nsproxy+0x343/0x3b0
[   40.783871][ T7003]  do_exit+0x5ea/0x1f80
[   40.788024][ T7003]  ? __up_read+0x1f1/0x6e0
[   40.792427][ T7003]  do_group_exit+0x15e/0x2c0
[   40.797001][ T7003]  ? trace_irq_disable_rcuidle+0x1f/0x1d0
[   40.802721][ T7003]  __do_sys_exit_group+0x13/0x20
[   40.807641][ T7003]  __se_sys_exit_group+0x10/0x10
[   40.812558][ T7003]  __x64_sys_exit_group+0x37/0x40
[   40.817560][ T7003]  do_syscall_64+0xf3/0x1b0
[   40.822065][ T7003]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   40.827978][ T7003] RIP: 0033:0x43f998
[   40.831866][ T7003] Code: Bad RIP value.
[   40.835919][ T7003] RSP: 002b:00007ffe0fb52498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   40.844306][ T7003] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f998
[   40.852262][ T7003] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
[   40.860212][ T7003] RBP: 00000000004bfa10 R08: 00000000000000e7 R09: ffffffffffffffd0
[   40.868157][ T7003] R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000000001
[   40.876104][ T7003] R13: 00000000006d11c0 R14: 0000000000000000 R15: 0000000000000000
[   40.885596][ T7003] Kernel Offset: disabled
[   40.890010][ T7003] Rebooting in 86400 seconds..