[[0;32m OK [0m] Started Getty on tty4.
[[0;32m OK [0m] Started Getty on tty3.
[[0;32m OK [0m] Started Getty on tty2.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Started OpenBSD Secure Shell server.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts.
syzkaller login: [ 43.537282][ T6826] IPVS: ftp: loaded support on port[0] = 21
[ 43.573695][ T6829] IPVS: ftp: loaded support on port[0] = 21
[ 43.574355][ T6828] IPVS: ftp: loaded support on port[0] = 21
[ 43.583627][ T6830] IPVS: ftp: loaded support on port[0] = 21
[ 43.597548][ T6832] IPVS: ftp: loaded support on port[0] = 21
[ 43.608759][ T6831] IPVS: ftp: loaded support on port[0] = 21
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[ 63.438843][T13913] ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 3453
[ 63.448413][ C1]
[ 63.448417][ C1] ======================================================
[ 63.448420][ C1] WARNING: possible circular locking dependency detected
[ 63.448423][ C1] 5.9.0-rc2-syzkaller #0 Not tainted
[ 63.448426][ C1] ------------------------------------------------------
[ 63.448429][ C1] syz-executor457/13913 is trying to acquire lock:
[ 63.448431][ C1] ffffffff894fc9c0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x2d/0x60
[ 63.448441][ C1]
[ 63.448443][ C1] but task is already holding lock:
[ 63.448445][ C1] ffffffff8c3277a0 (&port->lock#2){-.-.}-{2:2}, at: tty_port_close_start+0x58/0x550
[ 63.448456][ C1]
[ 63.448459][ C1] which lock already depends on the new lock.
[ 63.448460][ C1]
[ 63.448462][ C1]
[ 63.448465][ C1] the existing dependency chain (in reverse order) is:
[ 63.448466][ C1]
[ 63.448468][ C1] -> #2 (&port->lock#2){-.-.}-{2:2}:
executing program
executing program
executing program
executing program
[ 63.448478][ C1] lock_acquire+0x160/0x730
[ 63.448480][ C1] _raw_spin_lock_irqsave+0x9e/0xc0
[ 63.448483][ C1] tty_port_tty_get+0x21/0xe0
[ 63.448485][ C1] tty_port_default_wakeup+0x11/0x40
[ 63.448488][ C1] serial8250_tx_chars+0x5ea/0x800
[ 63.448491][ C1] serial8250_handle_irq+0x2fd/0x3e0
[ 63.448494][ C1] serial8250_default_handle_irq+0xac/0x190
[ 63.448496][ C1] serial8250_interrupt+0x93/0x180
[ 63.448499][ C1] __handle_irq_event_percpu+0x1b7/0x610
[ 63.448501][ C1] handle_irq_event+0xbd/0x280
[ 63.448504][ C1] handle_edge_irq+0x245/0xbf0
[ 63.448506][ C1] asm_call_on_stack+0xf/0x20
[ 63.448508][ C1] common_interrupt+0x13c/0x230
[ 63.448511][ C1] asm_common_interrupt+0x1e/0x40
[ 63.448514][ C1] _raw_spin_unlock_irqrestore+0xa5/0xd0
[ 63.448516][ C1] uart_write+0x767/0x8f0
[ 63.448519][ C1] do_output_char+0x63b/0x940
[ 63.448521][ C1] n_tty_write+0xd5c/0x1170
executing program
[ 63.448524][ C1] tty_write+0x593/0x940
[ 63.448526][ C1] do_iter_write+0x441/0x610
[ 63.448529][ C1] do_writev+0x23f/0x4a0
[ 63.448531][ C1] do_syscall_64+0x31/0x70
[ 63.448534][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 63.448535][ C1]
[ 63.448537][ C1] -> #1 (&port->lock){-.-.}-{2:2}:
[ 63.448545][ C1] lock_acquire+0x160/0x730
[ 63.448548][ C1] _raw_spin_lock_irqsave+0x9e/0xc0
[ 63.448550][ C1] serial8250_console_write+0x13e/0xd60
executing program
[ 63.448552][ C1] console_unlock+0x90c/0xec0
[ 63.448554][ C1] vprintk_emit+0x1f8/0x3c0
[ 63.448556][ C1] printk+0x62/0x83
[ 63.448558][ C1] register_console+0x7ca/0xad0
[ 63.448560][ C1] univ8250_console_init+0x41/0x43
[ 63.448562][ C1] console_init+0x52/0x97
[ 63.448564][ C1] start_kernel+0x2db/0x4f0
[ 63.448566][ C1] secondary_startup_64+0xa4/0xb0
[ 63.448567][ C1]
[ 63.448568][ C1] -> #0 (console_owner){-.-.}-{0:0}:
[ 63.448575][ C1] validate_chain+0x1b0c/0x88a0
executing program
executing program
executing program
[ 63.448577][ C1] __lock_acquire+0x1161/0x2ab0
[ 63.448579][ C1] lock_acquire+0x160/0x730
[ 63.448581][ C1] console_lock_spinning_enable+0x52/0x60
[ 63.448583][ C1] console_unlock+0x73f/0xec0
[ 63.448585][ C1] vprintk_emit+0x1f8/0x3c0
[ 63.448587][ C1] printk+0x62/0x83
[ 63.448589][ C1] tty_port_close_start+0x3c8/0x550
[ 63.448591][ C1] tty_port_close+0x25/0x140
[ 63.448593][ C1] tty_release+0x378/0xf90
[ 63.448595][ C1] __fput+0x34f/0x7b0
[ 63.448597][ C1] task_work_run+0x137/0x1c0
[ 63.448599][ C1] exit_to_user_mode_prepare+0xfa/0x1b0
[ 63.448601][ C1] syscall_exit_to_user_mode+0x5e/0x1a0
[ 63.448603][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 63.448604][ C1]
[ 63.448607][ C1] other info that might help us debug this:
[ 63.448608][ C1]
[ 63.448609][ C1] Chain exists of:
[ 63.448610][ C1] console_owner --> &port->lock --> &port->lock#2
[ 63.448620][ C1]
[ 63.448622][ C1] Possible unsafe locking scenario:
[ 63.448623][ C1]
[ 63.448625][ C1] CPU0 CPU1
[ 63.448627][ C1] ---- ----
[ 63.448628][ C1] lock(&port->lock#2);
[ 63.448633][ C1] lock(&port->lock);
[ 63.448638][ C1] lock(&port->lock#2);
[ 63.448642][ C1] lock(console_owner);
[ 63.448646][ C1]
[ 63.448647][ C1] *** DEADLOCK ***
[ 63.448648][ C1]
[ 63.448655][ C1] 3 locks held by syz-executor457/13913:
[ 63.448657][ C1] #0: ffff88809e74d1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_release+0xa5/0xf90
[ 63.448665][ C1] #1: ffffffff8c3277a0 (&port->lock#2){-.-.}-{2:2}, at: tty_port_close_start+0x58/0x550
[ 63.448674][ C1] #2: ffffffff894fc8a0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x1db/0x3c0
[ 63.448682][ C1]
[ 63.448683][ C1] stack backtrace:
[ 63.448686][ C1] CPU: 1 PID: 13913 Comm: syz-executor457 Not tainted 5.9.0-rc2-syzkaller #0
[ 63.448690][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 63.448691][ C1] Call Trace:
[ 63.448693][ C1] dump_stack+0x1f0/0x31e
[ 63.448695][ C1] print_circular_bug+0xc72/0xea0
[ 63.448697][ C1] ? stack_trace_save+0xad/0x150
[ 63.448699][ C1] ? save_trace+0x49/0xba0
[ 63.448701][ C1] check_noncircular+0x1fb/0x3a0
[ 63.448702][ C1] validate_chain+0x1b0c/0x88a0
[ 63.448704][ C1] ? mark_lock+0x102/0x1b00
[ 63.448706][ C1] ? mark_lock+0x102/0x1b00
[ 63.448708][ C1] ? put_dec_trunc8+0x19a/0x290
[ 63.448709][ C1] ? number+0xf14/0x1190
[ 63.448711][ C1] __lock_acquire+0x1161/0x2ab0
[ 63.448713][ C1] ? sprintf+0x71/0x90
[ 63.448715][ C1] lock_acquire+0x160/0x730
[ 63.448717][ C1] ? console_lock_spinning_enable+0x2d/0x60
[ 63.448719][ C1] console_lock_spinning_enable+0x52/0x60
[ 63.448721][ C1] ? console_lock_spinning_enable+0x2d/0x60
[ 63.448723][ C1] console_unlock+0x73f/0xec0
[ 63.448725][ C1] ? __down_trylock_console_sem+0x178/0x1b0
[ 63.448727][ C1] ? vprintk_emit+0x1db/0x3c0
[ 63.448729][ C1] ? vprintk_emit+0x1db/0x3c0
[ 63.448731][ C1] vprintk_emit+0x1f8/0x3c0
[ 63.448732][ C1] printk+0x62/0x83
[ 63.448734][ C1] tty_port_close_start+0x3c8/0x550
[ 63.448736][ C1] tty_port_close+0x25/0x140
[ 63.448738][ C1] ? tpk_open+0x60/0x60
[ 63.448739][ C1] tty_release+0x378/0xf90
[ 63.448741][ C1] ? ima_file_free+0xea/0x3b0
[ 63.448743][ C1] ? tty_release_struct+0xd0/0xd0
[ 63.448745][ C1] __fput+0x34f/0x7b0
[ 63.448747][ C1] task_work_run+0x137/0x1c0
[ 63.448749][ C1] exit_to_user_mode_prepare+0xfa/0x1b0
[ 63.448751][ C1] syscall_exit_to_user_mode+0x5e/0x1a0
[ 63.448753][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 63.448755][ C1] RIP: 0033:0x406f21
[ 63.448761][ C1] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
[ 63.448763][ C1] RSP: 002b:00007ffdd2e113d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
executing program
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[ 63.448768][ C1] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000406f21
[ 63.448771][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[ 63.448774][ C1] RBP: 00000000006dec30 R08: 0000000000000001 R09: 0000000000000001
[ 63.448777][ C1] R10: 00007ffdd2e113f0 R11: 0000000000000293 R12: 00000000006dec3c
[ 63.448779][ C1] R13: 0000000000000001 R14: 000000000000002d R15: 20c49ba5e353f7cf
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[ 64.246024][T13983] ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 6
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