Warning: Permanently added '10.128.0.177' (ECDSA) to the list of known hosts. syzkaller login: [ 127.880317][ T27] audit: type=1400 audit(1596697577.611:8): avc: denied { execmem } for pid=6842 comm="syz-executor851" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 127.902743][ T6851] IPVS: ftp: loaded support on port[0] = 21 [ 127.916674][ T6850] IPVS: ftp: loaded support on port[0] = 21 [ 127.921993][ T6849] IPVS: ftp: loaded support on port[0] = 21 [ 127.938159][ T6854] IPVS: ftp: loaded support on port[0] = 21 [ 127.941790][ T6853] IPVS: ftp: loaded support on port[0] = 21 [ 127.947559][ T6852] 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 [ 131.194045][ T17] Bluetooth: hci0: command 0x0409 tx timeout [ 131.207308][ T17] Bluetooth: hci1: command 0x0409 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 131.273269][ T17] Bluetooth: hci2: command 0x0409 tx timeout [ 131.273354][ T2641] Bluetooth: hci4: command 0x0409 tx timeout [ 131.280525][ T17] Bluetooth: hci5: command 0x0409 tx timeout [ 131.335888][ T7013] ------------[ cut here ]------------ [ 131.341548][ T7013] refcount_t: addition on 0; use-after-free. [ 131.347914][ T7013] WARNING: CPU: 1 PID: 7013 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 [ 131.357281][ T7013] Kernel panic - not syncing: panic_on_warn set ... [ 131.363850][ T7013] CPU: 1 PID: 7013 Comm: kworker/u5:6 Not tainted 5.8.0-syzkaller #0 [ 131.371883][ T7013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 131.381920][ T7013] Workqueue: hci3 hci_rx_work [ 131.386571][ T7013] Call Trace: [ 131.389842][ T7013] dump_stack+0x18f/0x20d [ 131.394154][ T7013] panic+0x2e3/0x75c [ 131.398030][ T7013] ? __warn_printk+0xf3/0xf3 [ 131.402600][ T7013] ? lockdep_hardirqs_on+0x76/0xf0 [ 131.407692][ T7013] ? __warn.cold+0x5/0x45 [ 131.411999][ T7013] ? __warn+0xd6/0x1f2 [ 131.416049][ T7013] ? refcount_warn_saturate+0x169/0x1e0 [ 131.421593][ T7013] __warn.cold+0x20/0x45 [ 131.425827][ T7013] ? wake_up_klogd.part.0+0x8c/0xc0 [ 131.431003][ T7013] ? refcount_warn_saturate+0x169/0x1e0 [ 131.436527][ T7013] report_bug+0x1bd/0x210 [ 131.440841][ T7013] handle_bug+0x38/0x90 [ 131.444974][ T7013] exc_invalid_op+0x14/0x40 [ 131.449457][ T7013] asm_exc_invalid_op+0x12/0x20 [ 131.454285][ T7013] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 131.460503][ T7013] Code: 07 31 ff 89 de e8 27 fb db fd 84 db 0f 85 36 ff ff ff e8 da fe db fd 48 c7 c7 c0 6b 93 88 c6 05 2a 8d 12 07 01 e8 39 10 ad fd <0f> 0b e9 17 ff ff ff e8 bb fe db fd 0f b6 1d 0f 8d 12 07 31 ff 89 [ 131.480082][ T7013] RSP: 0018:ffffc90001d07908 EFLAGS: 00010286 [ 131.486123][ T7013] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 131.494073][ T7013] RDX: ffff88809eb30000 RSI: ffffffff815d8ea7 RDI: fffff520003a0f13 [ 131.502022][ T7013] RBP: 0000000000000002 R08: 0000000000000001 R09: ffff8880ae731927 [ 131.509970][ T7013] R10: 0000000000000000 R11: 0000000031303754 R12: dffffc0000000000 [ 131.517917][ T7013] R13: 0000000000000001 R14: ffff888089ced000 R15: 0000000000000003 [ 131.525874][ T7013] ? vprintk_func+0x97/0x1a6 [ 131.530461][ T7013] ? refcount_warn_saturate+0x169/0x1e0 [ 131.535999][ T7013] l2cap_global_chan_by_psm+0x53f/0x5b0 [ 131.541537][ T7013] ? l2cap_chan_timeout+0x450/0x450 [ 131.546716][ T7013] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 131.552673][ T7013] ? mark_lock+0xbc/0x1710 [ 131.557066][ T7013] ? __lock_acquire+0x16cb/0x5640 [ 131.562072][ T7013] l2cap_recv_frame+0xc3b/0xae10 [ 131.567006][ T7013] ? hci_rx_work+0x35b/0xb10 [ 131.571579][ T7013] ? __lock_acquire+0xbb5/0x5640 [ 131.576500][ T7013] ? l2cap_config_rsp.isra.0+0x1130/0x1130 [ 131.582283][ T7013] ? find_held_lock+0x2d/0x110 [ 131.587025][ T7013] ? hci_rx_work+0x498/0xb10 [ 131.591593][ T7013] ? lock_downgrade+0x830/0x830 [ 131.596425][ T7013] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 131.602568][ T7013] ? find_held_lock+0x2d/0x110 [ 131.607311][ T7013] ? __mutex_unlock_slowpath+0xe2/0x610 [ 131.612834][ T7013] ? hci_conn_enter_active_mode+0x123/0x2f0 [ 131.618713][ T7013] l2cap_recv_acldata+0x7f6/0x8e0 [ 131.623719][ T7013] hci_rx_work+0x4c7/0xb10 [ 131.628119][ T7013] process_one_work+0x94c/0x1670 [ 131.633037][ T7013] ? lock_release+0x8e0/0x8e0 [ 131.637702][ T7013] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 131.643057][ T7013] ? rwlock_bug.part.0+0x90/0x90 [ 131.647978][ T7013] worker_thread+0x64c/0x1120 [ 131.652637][ T7013] ? __kthread_parkme+0x13f/0x1e0 [ 131.657639][ T7013] ? process_one_work+0x1670/0x1670 [ 131.662900][ T7013] kthread+0x3b5/0x4a0 [ 131.666945][ T7013] ? __kthread_bind_mask+0xc0/0xc0 [ 131.672031][ T7013] ? __kthread_bind_mask+0xc0/0xc0 [ 131.677210][ T7013] ret_from_fork+0x1f/0x30 [ 131.682794][ T7013] Kernel Offset: disabled [ 131.687169][ T7013] Rebooting in 86400 seconds..