[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.790141] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.263416] random: sshd: uninitialized urandom read (32 bytes read) [ 19.452649] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.320990] random: sshd: uninitialized urandom read (32 bytes read) [ 39.737461] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 45.174908] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 56.061937] ------------[ cut here ]------------ [ 56.068783] ODEBUG: init active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 [ 56.079011] WARNING: CPU: 0 PID: 17364 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 [ 56.087823] Kernel panic - not syncing: panic_on_warn set ... [ 56.087823] [ 56.095168] CPU: 0 PID: 17364 Comm: syz-executor746 Not tainted 4.18.0-rc7+ #170 [ 56.102677] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.112007] Call Trace: [ 56.114580] dump_stack+0x1c9/0x2b4 [ 56.118196] ? dump_stack_print_info.cold.2+0x52/0x52 [ 56.123372] panic+0x238/0x4e7 [ 56.126548] ? add_taint.cold.5+0x16/0x16 [ 56.130683] ? __warn.cold.8+0x148/0x1ba [ 56.134726] ? __warn.cold.8+0x117/0x1ba [ 56.138771] ? debug_print_object+0x16a/0x210 [ 56.143249] __warn.cold.8+0x163/0x1ba [ 56.147118] ? debug_print_object+0x16a/0x210 [ 56.151597] report_bug+0x252/0x2d0 [ 56.155204] do_error_trap+0x1fc/0x4d0 [ 56.159071] ? math_error+0x3e0/0x3e0 [ 56.162851] ? __internal_add_timer+0x2e0/0x2e0 [ 56.167511] ? vprintk_default+0x28/0x30 [ 56.171552] ? vprintk_func+0x81/0xe7 [ 56.175342] ? printk+0xa7/0xcf [ 56.178607] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.183432] do_invalid_op+0x1b/0x20 [ 56.187126] invalid_op+0x14/0x20 [ 56.190570] RIP: 0010:debug_print_object+0x16a/0x210 [ 56.195645] Code: 3a 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 20 74 3a 87 4c 89 f6 48 c7 c7 c0 69 3a 87 e8 c6 b0 e6 fd <0f> 0b 83 05 a9 e6 29 05 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f [ 56.214820] RSP: 0018:ffff8801c535f658 EFLAGS: 00010082 [ 56.220162] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 56.227410] RDX: 0000000000000000 RSI: ffffffff81632481 RDI: 0000000000000001 [ 56.234657] RBP: ffff8801c535f698 R08: ffff8801b5638440 R09: ffffed003b603ec2 [ 56.241908] R10: ffffed003b603ec2 R11: ffff8801db01f617 R12: 0000000000000001 [ 56.249159] R13: ffffffff87f9c9e0 R14: ffffffff873a6fc0 R15: ffffffff816918a0 [ 56.256410] ? __internal_add_timer+0x2e0/0x2e0 [ 56.261063] ? vprintk_func+0x81/0xe7 [ 56.264847] ? debug_print_object+0x16a/0x210 [ 56.269336] __debug_object_init+0x8e9/0x12e0 [ 56.273818] ? debug_object_free+0x690/0x690 [ 56.278209] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.283206] ? trace_hardirqs_on+0xd/0x10 [ 56.287346] ? __debug_object_init+0x581/0x12e0 [ 56.291997] ? debug_object_free+0x690/0x690 [ 56.296399] ? mark_held_locks+0xc9/0x160 [ 56.300527] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 56.305092] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 56.310181] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.315178] ? trace_hardirqs_on+0xd/0x10 [ 56.319308] debug_object_init+0x16/0x20 [ 56.323352] init_timer_key+0xa9/0x490 [ 56.327222] ? __queue_work+0x1410/0x1410 [ 56.331350] ? init_timer_on_stack_key+0xe0/0xe0 [ 56.336085] ? __local_bh_enable_ip+0x161/0x230 [ 56.340738] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.345737] ? lock_sock_nested+0x9f/0x120 [ 56.349956] ? __lockdep_init_map+0x105/0x590 [ 56.354438] vsock_stream_connect+0xc7a/0xfc0 [ 56.358916] ? vsock_dgram_connect+0x500/0x500 [ 56.363485] ? lock_downgrade+0x8f0/0x8f0 [ 56.367612] ? finish_wait+0x430/0x430 [ 56.371483] ? lock_release+0xa30/0xa30 [ 56.375438] ? check_same_owner+0x340/0x340 [ 56.379752] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 56.385272] ? _copy_from_user+0xdf/0x150 [ 56.389405] ? security_socket_connect+0x94/0xc0 [ 56.394144] __sys_connect+0x37d/0x4c0 [ 56.398021] ? do_fcntl+0x131/0x14f0 [ 56.401720] ? __ia32_sys_accept+0xb0/0xb0 [ 56.405938] ? f_getown+0xc0/0xc0 [ 56.409371] ? __fget_light+0x2f7/0x440 [ 56.413325] ? fget_raw+0x20/0x20 [ 56.416764] ? __x64_sys_futex+0x47f/0x6a0 [ 56.420980] ? do_futex+0x27d0/0x27d0 [ 56.424764] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 56.430285] ? fput+0x130/0x1a0 [ 56.433550] __x64_sys_connect+0x73/0xb0 [ 56.437593] do_syscall_64+0x1b9/0x820 [ 56.441462] ? finish_task_switch+0x1d3/0x870 [ 56.445946] ? syscall_return_slowpath+0x5e0/0x5e0 [ 56.450859] ? syscall_return_slowpath+0x31d/0x5e0 [ 56.455771] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 56.461120] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.465948] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 56.471119] RIP: 0033:0x445d59 [ 56.474298] Code: e8 ac e7 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 fb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 56.493474] RSP: 002b:00007fe17fb16da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 56.501166] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445d59 [ 56.508417] RDX: 0000000000000010 RSI: 0000000020000100 RDI: 0000000000000004 [ 56.515667] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 56.522920] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 56.530173] R13: 6b636f73762d7473 R14: 6f68762f7665642f R15: 0000000000000001 [ 56.537428] [ 56.537432] ====================================================== [ 56.537436] WARNING: possible circular locking dependency detected [ 56.537439] 4.18.0-rc7+ #170 Not tainted [ 56.537444] ------------------------------------------------------ [ 56.537448] syz-executor746/17364 is trying to acquire lock: [ 56.537450] (____ptrval____) ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 [ 56.537461] [ 56.537464] but task is already holding lock: [ 56.537466] (____ptrval____) (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x127/0x12e0 [ 56.537477] [ 56.537481] which lock already depends on the new lock. [ 56.537482] [ 56.537484] [ 56.537488] the existing dependency chain (in reverse order) is: [ 56.537489] [ 56.537491] -> #3 (&obj_hash[i].lock){-.-.}: [ 56.537502] _raw_spin_lock_irqsave+0x96/0xc0 [ 56.537505] __debug_object_init+0x127/0x12e0 [ 56.537508] debug_object_init+0x16/0x20 [ 56.537511] hrtimer_init+0x97/0x480 [ 56.537514] init_dl_task_timer+0x1b/0x50 [ 56.537517] __sched_fork+0x2ae/0x590 [ 56.537520] init_idle+0x75/0x7a0 [ 56.537523] sched_init+0xbf3/0xd2c [ 56.537526] start_kernel+0x47d/0x949 [ 56.537529] x86_64_start_reservations+0x29/0x2b [ 56.537532] x86_64_start_kernel+0x76/0x79 [ 56.537536] secondary_startup_64+0xa5/0xb0 [ 56.537537] [ 56.537539] -> #2 (&rq->lock){-.-.}: [ 56.537549] _raw_spin_lock+0x2a/0x40 [ 56.537552] task_fork_fair+0x93/0x680 [ 56.537555] sched_fork+0x446/0xb40 [ 56.537558] copy_process.part.39+0x1bf5/0x70b0 [ 56.537561] _do_fork+0x291/0x12a0 [ 56.537564] kernel_thread+0x34/0x40 [ 56.537566] rest_init+0x22/0xe4 [ 56.537569] start_kernel+0x90e/0x949 [ 56.537573] x86_64_start_reservations+0x29/0x2b [ 56.537576] x86_64_start_kernel+0x76/0x79 [ 56.537579] secondary_startup_64+0xa5/0xb0 [ 56.537581] [ 56.537582] -> #1 (&p->pi_lock){-.-.}: [ 56.537593] _raw_spin_lock_irqsave+0x96/0xc0 [ 56.537596] try_to_wake_up+0xd2/0x12a0 [ 56.537599] wake_up_process+0x10/0x20 [ 56.537602] __up.isra.1+0x1c0/0x2a0 [ 56.537604] up+0x13c/0x1c0 [ 56.537607] __up_console_sem+0xbe/0x1b0 [ 56.537610] console_unlock+0x7a2/0x10b0 [ 56.537613] vprintk_emit+0x6c6/0xdf0 [ 56.537616] vprintk_default+0x28/0x30 [ 56.537619] vprintk_func+0x7a/0xe7 [ 56.537622] printk+0xa7/0xcf [ 56.537625] load_umh+0x51/0xbd [ 56.537628] do_one_initcall+0x127/0x913 [ 56.537631] kernel_init_freeable+0x49b/0x58e [ 56.537634] kernel_init+0x11/0x1b3 [ 56.537637] ret_from_fork+0x3a/0x50 [ 56.537638] [ 56.537640] -> #0 ((console_sem).lock){-...}: [ 56.537650] lock_acquire+0x1e4/0x540 [ 56.537654] _raw_spin_lock_irqsave+0x96/0xc0 [ 56.537656] down_trylock+0x13/0x70 [ 56.537660] __down_trylock_console_sem+0xae/0x200 [ 56.537663] console_trylock+0x15/0xa0 [ 56.537666] vprintk_emit+0x6ad/0xdf0 [ 56.537669] vprintk_default+0x28/0x30 [ 56.537672] vprintk_func+0x7a/0xe7 [ 56.537674] printk+0xa7/0xcf [ 56.537677] __warn_printk+0x8c/0xe0 [ 56.537681] debug_print_object+0x16a/0x210 [ 56.537684] __debug_object_init+0x8e9/0x12e0 [ 56.537687] debug_object_init+0x16/0x20 [ 56.537690] init_timer_key+0xa9/0x490 [ 56.537693] vsock_stream_connect+0xc7a/0xfc0 [ 56.537696] __sys_connect+0x37d/0x4c0 [ 56.537700] __x64_sys_connect+0x73/0xb0 [ 56.537703] do_syscall_64+0x1b9/0x820 [ 56.537706] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 56.537708] [ 56.537711] other info that might help us debug this: [ 56.537713] [ 56.537715] Chain exists of: [ 56.537716] (console_sem).lock --> &rq->lock --> &obj_hash[i].lock [ 56.537730] [ 56.537733] Possible unsafe locking scenario: [ 56.537734] [ 56.537738] CPU0 CPU1 [ 56.537741] ---- ---- [ 56.537742] lock(&obj_hash[i].lock); [ 56.537749] lock(&rq->lock); [ 56.537756] lock(&obj_hash[i].lock); [ 56.537762] lock((console_sem).lock); [ 56.537768] [ 56.537770] *** DEADLOCK *** [ 56.537771] [ 56.537775] 2 locks held by syz-executor746/17364: [ 56.537776] #0: (____ptrval____) (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0x1e3/0xfc0 [ 56.537789] #1: (____ptrval____) (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x127/0x12e0 [ 56.537802] [ 56.537804] stack backtrace: [ 56.537809] CPU: 0 PID: 17364 Comm: syz-executor746 Not tainted 4.18.0-rc7+ #170 [ 56.537815] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.537817] Call Trace: [ 56.537820] dump_stack+0x1c9/0x2b4 [ 56.537824] ? dump_stack_print_info.cold.2+0x52/0x52 [ 56.537826] ? vprintk_func+0xd0/0xe7 [ 56.537830] print_circular_bug.isra.36.cold.57+0x1bd/0x27d [ 56.537833] ? save_trace+0xe0/0x290 [ 56.537836] __lock_acquire+0x3449/0x5020 [ 56.537839] ? trace_hardirqs_on+0x10/0x10 [ 56.537842] ? trace_hardirqs_on+0x10/0x10 [ 56.537845] ? lock_downgrade+0x8f0/0x8f0 [ 56.537849] ? finish_task_switch+0x18a/0x870 [ 56.537852] ? kasan_check_read+0x11/0x20 [ 56.537855] ? do_raw_spin_unlock+0xa7/0x2f0 [ 56.537858] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 56.537861] ? compat_start_thread+0x80/0x80 [ 56.537864] ? _raw_spin_unlock_irq+0x27/0x70 [ 56.537868] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.537871] ? trace_hardirqs_on+0xd/0x10 [ 56.537874] ? _raw_spin_unlock_irq+0x27/0x70 [ 56.537877] ? graph_lock+0x170/0x170 [ 56.537880] ? print_usage_bug+0xc0/0xc0 [ 56.537883] ? preempt_notifier_register+0x200/0x200 [ 56.537886] lock_acquire+0x1e4/0x540 [ 56.537889] ? down_trylock+0x13/0x70 [ 56.537892] ? lock_release+0xa30/0xa30 [ 56.537895] ? lock_downgrade+0x8f0/0x8f0 [ 56.537898] ? kvm_sched_clock_read+0x9/0x20 [ 56.537901] ? sched_clock+0x31/0x40 [ 56.537904] ? vprintk_emit+0x6ad/0xdf0 [ 56.537907] _raw_spin_lock_irqsave+0x96/0xc0 [ 56.537910] ? down_trylock+0x13/0x70 [ 56.537913] down_trylock+0x13/0x70 [ 56.537916] __down_trylock_console_sem+0xae/0x200 [ 56.537923] console_trylock+0x15/0xa0 [ 56.537926] vprintk_emit+0x6ad/0xdf0 [ 56.537929] ? wake_up_klogd+0x110/0x110 [ 56.537932] ? print_usage_bug+0xc0/0xc0 [ 56.537935] ? __lock_acquire+0x7fc/0x5020 [ 56.537938] ? print_usage_bug+0xc0/0xc0 [ 56.537941] ? rcu_note_context_switch+0x730/0x730 [ 56.537944] ? lock_acquire+0x1e4/0x540 [ 56.537948] ? __internal_add_timer+0x2e0/0x2e0 [ 56.537951] vprintk_default+0x28/0x30 [ 56.537953] vprintk_func+0x7a/0xe7 [ 56.537956] printk+0xa7/0xcf [ 56.537959] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 56.537962] ? lock_acquire+0x1e4/0x540 [ 56.537965] ? __warn_printk+0x80/0xe0 [ 56.537968] ? __queue_work+0x1410/0x1410 [ 56.537971] __warn_printk+0x8c/0xe0 [ 56.537974] ? test_taint+0x20/0x20 [ 56.537977] ? print_usage_bug+0xc0/0xc0 [ 56.537980] ? __queue_work+0x1410/0x1410 [ 56.537983] debug_print_object+0x16a/0x210 [ 56.537986] __debug_object_init+0x8e9/0x12e0 [ 56.537989] ? debug_object_free+0x690/0x690 [ 56.537993] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.537996] ? trace_hardirqs_on+0xd/0x10 [ 56.537999] ? __debug_object_init+0x581/0x12e0 [ 56.538002] ? debug_object_free+0x690/0x690 [ 56.538005] ? mark_held_locks+0xc9/0x160 [ 56.538009] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 56.538012] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 56.538016] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.538019] ? trace_hardirqs_on+0xd/0x10 [ 56.538022] debug_object_init+0x16/0x20 [ 56.538025] init_timer_key+0xa9/0x490 [ 56.538028] ? __queue_work+0x1410/0x1410 [ 56.538031] ? init_timer_on_stack_key+0xe0/0xe0 [ 56.538034] ? __local_bh_enable_ip+0x161/0x230 [ 56.538038] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 56.538041] ? lock_sock_nested+0x9f/0x120 [ 56.538044] ? __lockdep_init_map+0x105/0x590 [ 56.538047] vsock_stream_connect+0xc7a/0xfc0 [ 56.538050] ? vsock_dgram_connect+0x500/0x500 [ 56.538053] ? lock_downgrade+0x8f0/0x8f0 [ 56.538056] ? finish_wait+0x430/0x430 [ 56.538059] ? lock_release+0xa30/0xa30 [ 56.538062] ? check_same_owner+0x340/0x340 [ 56.538066] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 56.538069] ? _copy_from_user+0xdf/0x150 [ 56.538073] ? security_socket_connect+0x94/0xc0 [ 56.538075] __sys_connect+0x37d/0x4c0 [ 56.538078] ? do_fcntl+0x131/0x14f0 [ 56.538081] ? __ia32_sys_accept+0xb0/0xb0 [ 56.538084] ? f_getown+0xc0/0xc0 [ 56.538087] ? __fget_light+0x2f7/0x440 [ 56.538090] ? fget_raw+0x20/0x20 [ 56.538093] ? __x64_sys_futex+0x47f/0x6a0 [ 56.538096] ? do_futex+0x27d0/0x27d0 [ 56.538099] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 56.538102] ? fput+0x130/0x1a0 [ 56.538105] __x64_sys_connect+0x73/0xb0 [ 56.538108] do_syscall_64+0x1b9/0x820 [ 56.538111] ? finish_task_switch+0x1d3/0x870 [ 56.538115] ? syscall_return_slowpath+0x5e0/0x5e0 [ 56.538118] ? syscall_return_slowpath+0x31d/0x5e0 [ 56.538122] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 56.538125] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 56.538129] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 56.538131] RIP: 0033:0x445d59 [ 56.538133] Code: e8 ac e7 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 fb 0d fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 56.538239] RSP: 002b:00007fe17fb16da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 56.538247] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445d59 [ 56.538252] RDX: 0000000000000010 RSI: 0000000020000100 RDI: 0000000000000004 [ 56.538257] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 56.538261] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 56.538266] R13: 6b636f73762d7473 R14: 6f68762f7665642f R15: 0000000000000001 [ 57.596399] Shutting down cpus with NMI [ 58.546882] Dumping ftrace buffer: [ 58.550397] (ftrace buffer empty) [ 58.554083] Kernel Offset: disabled [ 58.557685] Rebooting in 86400 seconds..