[ 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 '10.128.0.61' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program syzkaller login: [ 76.779367][ T27] audit: type=1400 audit(1599724563.595:8): avc: denied { execmem } for pid=6841 comm="syz-executor800" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 76.796404][ T6842] 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 [ 76.987000][ T64] ------------[ cut here ]------------ [ 76.992772][ T64] refcount_t: addition on 0; use-after-free. [ 76.998945][ T64] WARNING: CPU: 0 PID: 64 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 [ 77.008134][ T64] Kernel panic - not syncing: panic_on_warn set ... [ 77.014757][ T64] CPU: 0 PID: 64 Comm: kworker/u4:3 Not tainted 5.9.0-rc4-syzkaller #0 [ 77.023002][ T64] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.033071][ T64] Workqueue: qrtr_ns_handler qrtr_ns_worker [ 77.038948][ T64] Call Trace: [ 77.042267][ T64] dump_stack+0x198/0x1fd [ 77.046582][ T64] panic+0x347/0x7c0 [ 77.050471][ T64] ? __warn_printk+0xf3/0xf3 [ 77.055049][ T64] ? _raw_spin_unlock+0x24/0x40 [ 77.059897][ T64] ? __printk_safe_exit+0x5/0x10 [ 77.064821][ T64] ? console_unlock+0x733/0xe60 [ 77.069679][ T64] ? __warn.cold+0x5/0x46 [ 77.074000][ T64] ? __warn+0xd6/0x1f2 [ 77.078064][ T64] ? refcount_warn_saturate+0x169/0x1e0 [ 77.083598][ T64] __warn.cold+0x20/0x46 [ 77.087823][ T64] ? wake_up_klogd.part.0+0x8c/0xc0 [ 77.093008][ T64] ? refcount_warn_saturate+0x169/0x1e0 [ 77.098543][ T64] report_bug+0x1bd/0x210 [ 77.102865][ T64] handle_bug+0x38/0x90 [ 77.107003][ T64] exc_invalid_op+0x14/0x40 [ 77.111497][ T64] asm_exc_invalid_op+0x12/0x20 [ 77.116354][ T64] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 77.122498][ T64] Code: 07 31 ff 89 de e8 67 d4 d8 fd 84 db 0f 85 36 ff ff ff e8 1a d8 d8 fd 48 c7 c7 00 dc 93 88 c6 05 e6 0d 12 07 01 e8 09 d9 a9 fd <0f> 0b e9 17 ff ff ff e8 fb d7 d8 fd 0f b6 1d cb 0d 12 07 31 ff 89 [ 77.142109][ T64] RSP: 0018:ffffc90000f979d8 EFLAGS: 00010086 [ 77.148783][ T64] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 77.156770][ T64] RDX: ffff8880a9314440 RSI: ffffffff815db9a7 RDI: fffff520001f2f2d [ 77.164734][ T64] RBP: 0000000000000002 R08: 0000000000000001 R09: ffff8880ae620f8b [ 77.172710][ T64] R10: 0000000000000000 R11: 0000000000003654 R12: ffff88821b0f4040 [ 77.180678][ T64] R13: ffff88808e857800 R14: ffff8880a1d6b970 R15: ffff8880a1d6b974 [ 77.188669][ T64] ? vprintk_func+0x97/0x1a6 [ 77.193263][ T64] ? refcount_warn_saturate+0x169/0x1e0 [ 77.198806][ T64] qrtr_recvmsg+0x845/0x970 [ 77.203319][ T64] ? qrtr_node_enqueue+0x1240/0x1240 [ 77.208690][ T64] ? lock_is_held_type+0xbb/0xf0 [ 77.213633][ T64] ? bpf_lsm_socket_recvmsg+0x5/0x10 [ 77.218903][ T64] ? security_socket_recvmsg+0x8f/0xc0 [ 77.224360][ T64] ? qrtr_node_enqueue+0x1240/0x1240 [ 77.229644][ T64] kernel_recvmsg+0x110/0x160 [ 77.234317][ T64] qrtr_ns_worker+0x15a/0x14fc [ 77.239071][ T64] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 77.245047][ T64] ? ctrl_cmd_del_client+0x730/0x730 [ 77.250321][ T64] ? lock_acquire+0x1f3/0xae0 [ 77.254984][ T64] ? process_one_work+0x85f/0x1670 [ 77.260101][ T64] ? _raw_spin_unlock_irq+0x1f/0x80 [ 77.265290][ T64] ? lock_is_held_type+0xbb/0xf0 [ 77.270344][ T64] process_one_work+0x94c/0x1670 [ 77.275281][ T64] ? lock_release+0x8f0/0x8f0 [ 77.279948][ T64] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 77.285832][ T64] ? rwlock_bug.part.0+0x90/0x90 [ 77.290883][ T64] ? lockdep_hardirqs_off+0x96/0xd0 [ 77.296076][ T64] worker_thread+0x64c/0x1120 [ 77.300750][ T64] ? __kthread_parkme+0x13f/0x1e0 [ 77.305779][ T64] ? process_one_work+0x1670/0x1670 [ 77.310986][ T64] kthread+0x3b5/0x4a0 [ 77.315060][ T64] ? __kthread_bind_mask+0xc0/0xc0 [ 77.320157][ T64] ret_from_fork+0x1f/0x30 [ 78.389092][ T64] Shutting down cpus with NMI [ 78.394944][ T64] Kernel Offset: disabled [ 78.399322][ T64] Rebooting in 86400 seconds..