[ OK ] Started Regular background program processing daemon. [ OK ] Started Daily apt upgrade and clean activities. Starting System Logging Service... [ OK ] Started Daily Cleanup of Temporary Directories. [ OK ] Reached target Timers. [ OK ] Started Permit User Sessions. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ 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... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.141' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 64.655322][ T27] audit: type=1400 audit(1601126268.906:8): avc: denied { execmem } for pid=6889 comm="syz-executor703" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 64.669962][ T6890] 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 [ 65.091932][ T199] ------------[ cut here ]------------ [ 65.097516][ T199] refcount_t: addition on 0; use-after-free. [ 65.103699][ T199] WARNING: CPU: 0 PID: 199 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 [ 65.112953][ T199] Kernel panic - not syncing: panic_on_warn set ... [ 65.119527][ T199] CPU: 0 PID: 199 Comm: kworker/u4:5 Not tainted 5.9.0-rc6-syzkaller #0 [ 65.127819][ T199] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.138115][ T199] Workqueue: qrtr_ns_handler qrtr_ns_worker [ 65.143976][ T199] Call Trace: [ 65.147244][ T199] dump_stack+0x198/0x1fd [ 65.151554][ T199] panic+0x382/0x7fb [ 65.155423][ T199] ? __warn_printk+0xf3/0xf3 [ 65.160002][ T199] ? _raw_spin_unlock+0x24/0x40 [ 65.164829][ T199] ? __printk_safe_exit+0x5/0x10 [ 65.169750][ T199] ? console_unlock+0x733/0xe60 [ 65.174577][ T199] ? __warn.cold+0x5/0x4b [ 65.178967][ T199] ? __warn+0xd6/0x1f2 [ 65.183014][ T199] ? refcount_warn_saturate+0x169/0x1e0 [ 65.188546][ T199] __warn.cold+0x20/0x4b [ 65.192764][ T199] ? wake_up_klogd.part.0+0x8e/0xd0 [ 65.197936][ T199] ? refcount_warn_saturate+0x169/0x1e0 [ 65.203469][ T199] report_bug+0x1bd/0x210 [ 65.207777][ T199] handle_bug+0x38/0x90 [ 65.211910][ T199] exc_invalid_op+0x14/0x40 [ 65.216414][ T199] asm_exc_invalid_op+0x12/0x20 [ 65.221248][ T199] RIP: 0010:refcount_warn_saturate+0x169/0x1e0 [ 65.227376][ T199] Code: 07 31 ff 89 de e8 a7 58 b6 fd 84 db 0f 85 36 ff ff ff e8 7a 5c b6 fd 48 c7 c7 40 71 d8 88 c6 05 35 99 94 07 01 e8 e9 99 86 fd <0f> 0b e9 17 ff ff ff e8 5b 5c b6 fd 0f b6 1d 1a 99 94 07 31 ff 89 [ 65.246955][ T199] RSP: 0018:ffffc900018079d8 EFLAGS: 00010086 [ 65.252995][ T199] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 65.260952][ T199] RDX: ffff8880a8a52300 RSI: ffffffff815f5985 RDI: fffff52000300f2d [ 65.268910][ T199] RBP: 0000000000000002 R08: 0000000000000001 R09: ffff8880ae420f8b [ 65.276856][ T199] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821b0b8040 [ 65.284889][ T199] R13: ffff88809f407400 R14: ffff8880a0abd670 R15: ffff8880a0abd674 [ 65.292859][ T199] ? vprintk_func+0x95/0x1d4 [ 65.297451][ T199] ? refcount_warn_saturate+0x169/0x1e0 [ 65.302971][ T199] qrtr_recvmsg+0x845/0x970 [ 65.307455][ T199] ? qrtr_node_enqueue+0x1250/0x1250 [ 65.312727][ T199] ? lock_is_held_type+0xbb/0xf0 [ 65.317645][ T199] ? bpf_lsm_socket_recvmsg+0x5/0x10 [ 65.322930][ T199] ? security_socket_recvmsg+0x8f/0xc0 [ 65.328450][ T199] ? qrtr_node_enqueue+0x1250/0x1250 [ 65.333717][ T199] kernel_recvmsg+0x110/0x160 [ 65.338372][ T199] qrtr_ns_worker+0x15a/0x153b [ 65.343123][ T199] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 65.349093][ T199] ? ctrl_cmd_del_client+0x730/0x730 [ 65.354356][ T199] ? lock_acquire+0x1f3/0xaf0 [ 65.359032][ T199] ? process_one_work+0x85f/0x1670 [ 65.364179][ T199] ? _raw_spin_unlock_irq+0x1f/0x80 [ 65.369362][ T199] ? lock_is_held_type+0xbb/0xf0 [ 65.374282][ T199] process_one_work+0x94c/0x1670 [ 65.379243][ T199] ? lock_release+0x8f0/0x8f0 [ 65.383898][ T199] ? pwq_dec_nr_in_flight+0x320/0x320 [ 65.389258][ T199] ? rwlock_bug.part.0+0x90/0x90 [ 65.394181][ T199] ? lockdep_hardirqs_off+0x96/0xd0 [ 65.399359][ T199] worker_thread+0x64c/0x1120 [ 65.404019][ T199] ? process_one_work+0x1670/0x1670 [ 65.409193][ T199] kthread+0x3b5/0x4a0 [ 65.413238][ T199] ? __kthread_bind_mask+0xc0/0xc0 [ 65.418329][ T199] ret_from_fork+0x1f/0x30 [ 66.517366][ T199] Shutting down cpus with NMI [ 66.523322][ T199] Kernel Offset: disabled [ 66.527702][ T199] Rebooting in 86400 seconds..