Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 59.893091][ T6836] 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 [ 60.469463][ T118] ------------[ cut here ]------------ [ 60.475098][ T118] refcount_t: addition on 0; use-after-free. [ 60.481283][ T118] WARNING: CPU: 0 PID: 118 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 [ 60.490725][ T118] Kernel panic - not syncing: panic_on_warn set ... [ 60.497308][ T118] CPU: 0 PID: 118 Comm: kworker/u4:3 Not tainted 5.9.0-rc3-syzkaller #0 [ 60.505624][ T118] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.515681][ T118] Workqueue: qrtr_ns_handler qrtr_ns_worker [ 60.521761][ T118] Call Trace: [ 60.525577][ T118] dump_stack+0x198/0x1fd [ 60.529928][ T118] panic+0x347/0x7c0 [ 60.533840][ T118] ? __warn_printk+0xf3/0xf3 [ 60.538578][ T118] ? _raw_spin_unlock+0x24/0x40 [ 60.543453][ T118] ? __printk_safe_exit+0x5/0x10 [ 60.548585][ T118] ? console_unlock+0x733/0xe60 [ 60.553418][ T118] ? __warn.cold+0x5/0x46 [ 60.557730][ T118] ? __warn+0xd6/0x1f2 [ 60.561779][ T118] ? refcount_warn_saturate+0x169/0x1e0 [ 60.567315][ T118] __warn.cold+0x20/0x46 [ 60.571539][ T118] ? wake_up_klogd.part.0+0x8c/0xc0 [ 60.576718][ T118] ? refcount_warn_saturate+0x169/0x1e0 [ 60.582244][ T118] report_bug+0x1bd/0x210 [ 60.586555][ T118] handle_bug+0x38/0x90 [ 60.590691][ T118] exc_invalid_op+0x14/0x40 [ 60.595272][ T118] asm_exc_invalid_op+0x12/0x20 [ 60.600117][ T118] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 60.606263][ T118] Code: 07 31 ff 89 de e8 e7 df d8 fd 84 db 0f 85 36 ff ff ff e8 9a e3 d8 fd 48 c7 c7 00 dc 93 88 c6 05 67 18 12 07 01 e8 09 e7 a9 fd <0f> 0b e9 17 ff ff ff e8 7b e3 d8 fd 0f b6 1d 4c 18 12 07 31 ff 89 [ 60.625857][ T118] RSP: 0018:ffffc900013479d8 EFLAGS: 00010086 [ 60.631915][ T118] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 60.639883][ T118] RDX: ffff8880a8dd4000 RSI: ffffffff815db9a7 RDI: fffff52000268f2d [ 60.647852][ T118] RBP: 0000000000000002 R08: 0000000000000001 R09: ffff8880ae620f8b [ 60.655803][ T118] R10: 0000000000000000 R11: 0000000038313154 R12: ffff88821b0f4040 [ 60.663764][ T118] R13: ffff888095619c00 R14: ffff8880a87eb7f0 R15: ffff8880a87eb7f4 [ 60.671755][ T118] ? vprintk_func+0x97/0x1a6 [ 60.676436][ T118] ? refcount_warn_saturate+0x169/0x1e0 [ 60.681968][ T118] qrtr_recvmsg+0x845/0x970 [ 60.686455][ T118] ? qrtr_node_enqueue+0x1240/0x1240 [ 60.691719][ T118] ? lock_is_held_type+0xbb/0xf0 [ 60.696654][ T118] ? bpf_lsm_socket_recvmsg+0x5/0x10 [ 60.701929][ T118] ? security_socket_recvmsg+0x8f/0xc0 [ 60.707377][ T118] ? qrtr_node_enqueue+0x1240/0x1240 [ 60.712655][ T118] kernel_recvmsg+0x110/0x160 [ 60.717315][ T118] qrtr_ns_worker+0x15a/0x14fc [ 60.722063][ T118] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 60.728035][ T118] ? ctrl_cmd_del_client+0x730/0x730 [ 60.733329][ T118] ? lock_acquire+0x1f3/0xae0 [ 60.737986][ T118] ? process_one_work+0x85f/0x1670 [ 60.743085][ T118] ? _raw_spin_unlock_irq+0x1f/0x80 [ 60.748263][ T118] ? lock_is_held_type+0xbb/0xf0 [ 60.753184][ T118] process_one_work+0x94c/0x1670 [ 60.758121][ T118] ? lock_release+0x8f0/0x8f0 [ 60.762853][ T118] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 60.768238][ T118] ? rwlock_bug.part.0+0x90/0x90 [ 60.773155][ T118] ? lockdep_hardirqs_off+0x96/0xd0 [ 60.778335][ T118] worker_thread+0x64c/0x1120 [ 60.783114][ T118] ? process_one_work+0x1670/0x1670 [ 60.788292][ T118] kthread+0x3b5/0x4a0 [ 60.792369][ T118] ? __kthread_bind_mask+0xc0/0xc0 [ 60.797476][ T118] ret_from_fork+0x1f/0x30 [ 61.867099][ T118] Shutting down cpus with NMI [ 61.873096][ T118] Kernel Offset: disabled [ 61.877484][ T118] Rebooting in 86400 seconds..