[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.18' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 80.230660][ T2762] Bluetooth: psm cannot be added err -98 [ 80.250581][ T2762] ------------[ cut here ]------------ [ 80.270023][ T2762] refcount_t: underflow; use-after-free. executing program executing program [ 80.295298][ T2762] WARNING: CPU: 1 PID: 2762 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 [ 80.304787][ T2762] Kernel panic - not syncing: panic_on_warn set ... [ 80.311563][ T2762] CPU: 1 PID: 2762 Comm: kworker/1:3 Not tainted 5.7.0-rc5-syzkaller #0 [ 80.320209][ T2762] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 80.330288][ T2762] Workqueue: events do_enable_set [ 80.335451][ T2762] Call Trace: [ 80.338755][ T2762] dump_stack+0x188/0x20d executing program executing program executing program [ 80.343101][ T2762] ? refcount_warn_saturate+0x1c0/0x1e0 [ 80.348660][ T2762] panic+0x2e3/0x75c [ 80.352817][ T2762] ? add_taint.cold+0x16/0x16 [ 80.357516][ T2762] ? __probe_kernel_read+0x188/0x1d0 [ 80.362810][ T2762] ? __warn.cold+0x14/0x35 [ 80.367235][ T2762] ? __warn+0xd5/0x1c8 [ 80.371406][ T2762] ? refcount_warn_saturate+0x1d1/0x1e0 [ 80.377117][ T2762] __warn.cold+0x2f/0x35 [ 80.381493][ T2762] ? refcount_warn_saturate+0x1d1/0x1e0 [ 80.387138][ T2762] report_bug+0x27b/0x2f0 executing program executing program [ 80.391482][ T2762] do_error_trap+0x12b/0x220 [ 80.396170][ T2762] ? refcount_warn_saturate+0x1d1/0x1e0 [ 80.401728][ T2762] do_invalid_op+0x32/0x40 [ 80.406154][ T2762] ? refcount_warn_saturate+0x1d1/0x1e0 [ 80.411709][ T2762] invalid_op+0x23/0x30 [ 80.415881][ T2762] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 [ 80.422156][ T2762] Code: e9 db fe ff ff 48 89 df e8 cc a5 1a fe e9 8a fe ff ff e8 72 d6 dc fd 48 c7 c7 60 5c 72 88 c6 05 4a 3f ee 06 01 e8 47 11 ae fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55 executing program executing program executing program [ 80.441897][ T2762] RSP: 0018:ffffc90007e9fbe8 EFLAGS: 00010282 [ 80.448233][ T2762] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 80.456337][ T2762] RDX: 0000000000000000 RSI: ffffffff815ce641 RDI: fffff52000fd3f6f [ 80.464320][ T2762] RBP: 0000000000000003 R08: ffff88809fe9e340 R09: ffffed1015ce66a9 [ 80.472304][ T2762] R10: ffff8880ae733547 R11: ffffed1015ce66a8 R12: ffff8880a92db018 [ 80.480418][ T2762] R13: ffff888092161100 R14: ffffc90007e9fc90 R15: ffffc90007e9fc90 [ 80.488430][ T2762] ? vprintk_func+0x81/0x17e [ 80.493044][ T2762] ? refcount_warn_saturate+0x1d1/0x1e0 [ 80.498602][ T2762] l2cap_chan_put+0x1d3/0x230 [ 80.503302][ T2762] do_enable_set+0x4db/0x8e0 [ 80.507911][ T2762] ? lowpan_control_write+0x480/0x480 [ 80.513307][ T2762] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 80.518868][ T2762] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 80.524861][ T2762] ? _raw_spin_unlock_irq+0x1f/0x80 [ 80.530309][ T2762] process_one_work+0x965/0x16a0 [ 80.535387][ T2762] ? lock_release+0x800/0x800 [ 80.540088][ T2762] ? pwq_dec_nr_in_flight+0x310/0x310 [ 80.545482][ T2762] ? rwlock_bug.part.0+0x90/0x90 [ 80.550524][ T2762] worker_thread+0x96/0xe20 [ 80.555062][ T2762] ? process_one_work+0x16a0/0x16a0 [ 80.560270][ T2762] kthread+0x388/0x470 [ 80.564350][ T2762] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 80.570089][ T2762] ret_from_fork+0x24/0x30 [ 80.576138][ T2762] Kernel Offset: disabled [ 80.580520][ T2762] Rebooting in 86400 seconds..