Warning: Permanently added '10.128.0.54' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 109.936442][T11482] ------------[ cut here ]------------ [ 109.941968][T11482] WARNING: CPU: 1 PID: 11482 at lib/percpu-refcount.c:111 percpu_ref_exit+0xab/0xd0 [ 109.951333][T11482] Kernel panic - not syncing: panic_on_warn set ... [ 109.957910][T11482] CPU: 1 PID: 11482 Comm: syz-executor051 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 109.967916][T11482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 109.977967][T11482] Call Trace: [ 109.981254][T11482] dump_stack+0x197/0x210 [ 109.985595][T11482] ? percpu_ref_exit+0x10/0xd0 [ 109.990411][T11482] panic+0x2e3/0x75c [ 109.994291][T11482] ? add_taint.cold+0x16/0x16 [ 109.998971][T11482] ? printk+0xba/0xed [ 110.002988][T11482] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 110.008839][T11482] ? __warn.cold+0x14/0x3e [ 110.013247][T11482] ? __warn+0xd9/0x1cf [ 110.017304][T11482] ? percpu_ref_exit+0xab/0xd0 [ 110.022048][T11482] __warn.cold+0x2f/0x3e [ 110.026270][T11482] ? report_bug.cold+0x63/0xb2 [ 110.031028][T11482] ? percpu_ref_exit+0xab/0xd0 [ 110.035783][T11482] report_bug+0x289/0x300 [ 110.040115][T11482] do_error_trap+0x11b/0x200 [ 110.045220][T11482] do_invalid_op+0x37/0x50 [ 110.049638][T11482] ? percpu_ref_exit+0xab/0xd0 [ 110.054385][T11482] invalid_op+0x23/0x30 [ 110.058649][T11482] RIP: 0010:percpu_ref_exit+0xab/0xd0 [ 110.064006][T11482] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 1d 48 c7 43 08 03 00 00 00 e8 01 41 e5 fd 5b 41 5c 41 5d 5d c3 e8 f5 40 e5 fd <0f> 0b eb bf 4c 89 ef e8 29 2c 23 fe eb d9 e8 82 2b 23 fe eb a7 4c [ 110.083600][T11482] RSP: 0018:ffffc9000cb17968 EFLAGS: 00010293 [ 110.089673][T11482] RAX: ffff8880a3390640 RBX: ffff8880a83a8010 RCX: ffffffff83901432 [ 110.097645][T11482] RDX: 0000000000000000 RSI: ffffffff8390149b RDI: ffff8880a83a8028 [ 110.105603][T11482] RBP: ffffc9000cb17980 R08: ffff8880a3390640 R09: 0000000000000000 [ 110.113567][T11482] R10: 0000000000000000 R11: 0000000000000000 R12: 0000607f51435750 [ 110.121532][T11482] R13: ffff8880a83a8018 R14: ffff888097b95000 R15: ffff888097b95228 [ 110.130458][T11482] ? percpu_ref_exit+0x42/0xd0 [ 110.135205][T11482] ? percpu_ref_exit+0xab/0xd0 [ 110.139954][T11482] ? percpu_ref_exit+0xab/0xd0 [ 110.144713][T11482] io_sqe_files_unregister+0x7d/0x2f0 [ 110.150953][T11482] ? __mmdrop+0x239/0x320 [ 110.155269][T11482] io_ring_ctx_wait_and_kill+0x430/0x9a0 [ 110.160887][T11482] ? __sanitizer_cov_trace_const_cmp2+0x11/0x20 [ 110.167155][T11482] io_uring_release+0x42/0x50 [ 110.171842][T11482] __fput+0x2ff/0x890 [ 110.175817][T11482] ? io_ring_ctx_wait_and_kill+0x9a0/0x9a0 [ 110.181613][T11482] ____fput+0x16/0x20 [ 110.185586][T11482] task_work_run+0x145/0x1c0 [ 110.190163][T11482] do_exit+0x909/0x2f20 [ 110.194333][T11482] ? get_signal+0x2c1/0x24f0 [ 110.198914][T11482] ? mm_update_next_owner+0x7c0/0x7c0 [ 110.204280][T11482] ? lock_downgrade+0x920/0x920 [ 110.209122][T11482] ? _raw_spin_unlock_irq+0x23/0x80 [ 110.214304][T11482] ? get_signal+0x392/0x24f0 [ 110.218983][T11482] ? _raw_spin_unlock_irq+0x23/0x80 [ 110.224183][T11482] do_group_exit+0x135/0x360 [ 110.228845][T11482] get_signal+0x47c/0x24f0 [ 110.233247][T11482] ? __x64_sys_io_uring_register+0x1b0/0x570 [ 110.239212][T11482] ? __io_uring_register+0x118/0x2790 [ 110.244581][T11482] do_signal+0x87/0x1700 [ 110.248820][T11482] ? mutex_trylock+0x2d0/0x2d0 [ 110.253572][T11482] ? setup_sigcontext+0x7d0/0x7d0 [ 110.258585][T11482] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 110.264131][T11482] ? exit_to_usermode_loop+0x43/0x380 [ 110.269484][T11482] ? do_syscall_64+0x676/0x790 [ 110.274239][T11482] ? exit_to_usermode_loop+0x43/0x380 [ 110.279602][T11482] ? lockdep_hardirqs_on+0x421/0x5e0 [ 110.284874][T11482] ? trace_hardirqs_on+0x67/0x240 [ 110.289882][T11482] exit_to_usermode_loop+0x286/0x380 [ 110.295151][T11482] do_syscall_64+0x676/0x790 [ 110.299824][T11482] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 110.305720][T11482] RIP: 0033:0x4468f9 [ 110.309596][T11482] Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 110.329183][T11482] RSP: 002b:00007f7ef700ddb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 110.337695][T11482] RAX: fffffffffffffe00 RBX: 00000000006dbc38 RCX: 00000000004468f9 [ 110.345654][T11482] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc38 [ 110.353616][T11482] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 110.361625][T11482] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c [ 110.370834][T11482] R13: 00007fff8371e42f R14: 00007f7ef700e9c0 R15: 0000000000000001 [ 110.380446][T11482] Kernel Offset: disabled [ 110.384847][T11482] Rebooting in 86400 seconds..