Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.1.46' (ECDSA) to the list of known hosts.
syzkaller login: [ 60.952603][ T6870] IPVS: ftp: loaded support on port[0] = 21
[ 60.957364][ T6866] IPVS: ftp: loaded support on port[0] = 21
[ 60.962751][ T6873] IPVS: ftp: loaded support on port[0] = 21
[ 60.974645][ T6874] IPVS: ftp: loaded support on port[0] = 21
[ 60.986186][ T6872] IPVS: ftp: loaded support on port[0] = 21
[ 60.996313][ T6871] IPVS: ftp: loaded support on port[0] = 21
[ 61.320530][ T516] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.339834][ T516] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.393123][ T7] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.402431][ T6980] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 61.410913][ T516] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.427171][ T7] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.444925][ T516] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.453762][ T6980] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 61.477240][ T6980] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 61.517361][ T99] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.525545][ T99] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.533908][ T21] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.555139][ T21] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.564624][ T6980] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 61.576986][ T6980] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 61.641986][ T7] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.650476][ T99] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.665489][ T99] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.675187][ T7] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.685168][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
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[ 61.695107][ T21] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.703238][ T21] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.731315][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
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[ 61.756089][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[ 61.770627][ T99] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.783642][ T99] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
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[ 61.830187][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
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[ 61.889186][ T21] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.897638][ T7] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.914967][ T21] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.922497][ T7] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
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[ 61.944568][ T516] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 61.959375][ T516] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 61.970841][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[ 61.986891][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
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[ 62.017673][ T2626] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
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[ 63.212088][ T7364] ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 138
[ 63.222251][ C0]
[ 63.222258][ C0] ======================================================
[ 63.222264][ C0] WARNING: possible circular locking dependency detected
[ 63.222269][ C0] 5.9.0-rc6-next-20200924-syzkaller #0 Not tainted
[ 63.222274][ C0] ------------------------------------------------------
[ 63.222279][ C0] syz-executor026/7364 is trying to acquire lock:
[ 63.222285][ C0] ffffffff8a465260 (console_owner){-.-.}-{0:0}, at: console_unlock+0x36a/0xd20
[ 63.222304][ C0]
[ 63.222308][ C0] but task is already holding lock:
[ 63.222312][ C0] ffffffff8e5baaf8 (&port->lock){-.-.}-{2:2}, at: tty_port_close_start.part.0+0x28/0x550
[ 63.222330][ C0]
[ 63.222335][ C0] which lock already depends on the new lock.
[ 63.222337][ C0]
[ 63.222340][ C0]
[ 63.222345][ C0] the existing dependency chain (in reverse order) is:
[ 63.222348][ C0]
[ 63.222350][ C0] -> #2 (&port->lock){-.-.}-{2:2}:
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[ 63.222367][ C0] _raw_spin_lock_irqsave+0x94/0xd0
[ 63.222371][ C0] tty_port_tty_get+0x1f/0x100
[ 63.222376][ C0] tty_port_default_wakeup+0x11/0x40
[ 63.222380][ C0] serial8250_tx_chars+0x487/0xa80
[ 63.222385][ C0] serial8250_handle_irq.part.0+0x328/0x3d0
[ 63.222390][ C0] serial8250_default_handle_irq+0xb2/0x220
[ 63.222395][ C0] serial8250_interrupt+0xe6/0x190
[ 63.222400][ C0] __handle_irq_event_percpu+0x20b/0x9e0
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[ 63.222404][ C0] handle_irq_event+0x102/0x290
[ 63.222408][ C0] handle_edge_irq+0x25f/0xd00
[ 63.222413][ C0] asm_call_on_stack+0xf/0x20
[ 63.222417][ C0] common_interrupt+0x115/0x1f0
[ 63.222421][ C0] asm_common_interrupt+0x1e/0x40
[ 63.222425][ C0] native_safe_halt+0xe/0x10
[ 63.222430][ C0] acpi_idle_do_entry+0x1e8/0x330
[ 63.222434][ C0] acpi_idle_enter+0x35a/0x550
[ 63.222438][ C0] cpuidle_enter_state+0x1ab/0xd20
[ 63.222442][ C0] cpuidle_enter+0x4a/0xa0
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[ 63.222446][ C0] do_idle+0x48e/0x730
[ 63.222451][ C0] cpu_startup_entry+0x14/0x20
[ 63.222456][ C0] secondary_startup_64_no_verify+0xa6/0xab
[ 63.222458][ C0]
[ 63.222461][ C0] -> #1 (&port_lock_key){-.-.}-{2:2}:
[ 63.222477][ C0] _raw_spin_lock_irqsave+0x94/0xd0
[ 63.222482][ C0] serial8250_console_write+0x200/0xb30
[ 63.222486][ C0] console_unlock+0xac0/0xd20
[ 63.222490][ C0] vprintk_emit+0x2a6/0x6e0
[ 63.222494][ C0] vprintk_func+0x8d/0x1e0
[ 63.222498][ C0] printk+0xba/0xed
[ 63.222502][ C0] register_console+0x55f/0x810
[ 63.222506][ C0] univ8250_console_init+0x3a/0x46
[ 63.222511][ C0] console_init+0x3c7/0x596
[ 63.222515][ C0] start_kernel+0x31c/0x4b1
[ 63.222519][ C0] secondary_startup_64_no_verify+0xa6/0xab
[ 63.222522][ C0]
[ 63.222524][ C0] -> #0 (console_owner){-.-.}-{0:0}:
[ 63.222540][ C0] __lock_acquire+0x285b/0x56d0
[ 63.222545][ C0] lock_acquire+0x1f2/0xaa0
[ 63.222549][ C0] console_unlock+0x3e9/0xd20
[ 63.222553][ C0] vprintk_emit+0x2a6/0x6e0
[ 63.222557][ C0] vprintk_func+0x8d/0x1e0
[ 63.222561][ C0] printk+0xba/0xed
[ 63.222566][ C0] tty_port_close_start.part.0+0x503/0x550
[ 63.222570][ C0] tty_port_close+0x46/0x170
[ 63.222574][ C0] tty_release+0x455/0xf60
[ 63.222577][ C0] __fput+0x285/0x920
[ 63.222582][ C0] task_work_run+0xdd/0x190
[ 63.222586][ C0] exit_to_user_mode_prepare+0x1e2/0x1f0
[ 63.222591][ C0] syscall_exit_to_user_mode+0x7a/0x2c0
[ 63.222596][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 63.222598][ C0]
[ 63.222603][ C0] other info that might help us debug this:
[ 63.222605][ C0]
[ 63.222608][ C0] Chain exists of:
[ 63.222611][ C0] console_owner --> &port_lock_key --> &port->lock
[ 63.222631][ C0]
[ 63.222636][ C0] Possible unsafe locking scenario:
[ 63.222638][ C0]
[ 63.222642][ C0] CPU0 CPU1
[ 63.222647][ C0] ---- ----
[ 63.222649][ C0] lock(&port->lock);
[ 63.222660][ C0] lock(&port_lock_key);
[ 63.222670][ C0] lock(&port->lock);
[ 63.222679][ C0] lock(console_owner);
[ 63.222686][ C0]
[ 63.222689][ C0] *** DEADLOCK ***
[ 63.222692][ C0]
[ 63.222696][ C0] 3 locks held by syz-executor026/7364:
[ 63.222699][ C0] #0: ffff8880a69301c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0xbd/0x120
[ 63.222718][ C0] #1: ffffffff8e5baaf8 (&port->lock){-.-.}-{2:2}, at: tty_port_close_start.part.0+0x28/0x550
[ 63.222740][ C0] #2: ffffffff8a5455e0 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8d/0x1e0
[ 63.222759][ C0]
[ 63.222762][ C0] stack backtrace:
[ 63.222769][ C0] CPU: 0 PID: 7364 Comm: syz-executor026 Not tainted 5.9.0-rc6-next-20200924-syzkaller #0
[ 63.222776][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 63.222779][ C0] Call Trace:
[ 63.222782][ C0] dump_stack+0x198/0x1fb
[ 63.222786][ C0] check_noncircular+0x25d/0x2e0
[ 63.222790][ C0] ? stack_trace_consume_entry+0x160/0x160
[ 63.222794][ C0] ? print_circular_bug+0x3a0/0x3a0
[ 63.222797][ C0] ? memcpy+0x39/0x60
[ 63.222801][ C0] ? alloc_chain_hlocks+0x230/0x770
[ 63.222805][ C0] __lock_acquire+0x285b/0x56d0
[ 63.222810][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530
[ 63.222813][ C0] lock_acquire+0x1f2/0xaa0
[ 63.222817][ C0] ? console_unlock+0x36a/0xd20
[ 63.222821][ C0] ? lock_release+0x890/0x890
[ 63.222825][ C0] ? lock_downgrade+0x830/0x830
[ 63.222828][ C0] ? do_raw_spin_lock+0x120/0x2b0
[ 63.222832][ C0] ? rwlock_bug.part.0+0x90/0x90
[ 63.222836][ C0] console_unlock+0x3e9/0xd20
[ 63.222840][ C0] ? console_unlock+0x36a/0xd20
[ 63.222844][ C0] ? syslog_print+0x570/0x570
[ 63.222847][ C0] ? lock_release+0x890/0x890
[ 63.222851][ C0] ? do_raw_spin_unlock+0x171/0x230
[ 63.222855][ C0] ? vprintk_func+0x8d/0x1e0
[ 63.222859][ C0] vprintk_emit+0x2a6/0x6e0
[ 63.222863][ C0] vprintk_func+0x8d/0x1e0
[ 63.222866][ C0] printk+0xba/0xed
[ 63.222870][ C0] ? record_print_text.cold+0x16/0x16
[ 63.222874][ C0] ? check_preemption_disabled+0x50/0x130
[ 63.222879][ C0] ? _raw_spin_lock_irqsave+0xa9/0xd0
[ 63.222883][ C0] tty_port_close_start.part.0+0x503/0x550
[ 63.222887][ C0] tty_port_close+0x46/0x170
[ 63.222891][ C0] ? tpk_open+0x60/0x60
[ 63.222894][ C0] tty_release+0x455/0xf60
[ 63.222898][ C0] __fput+0x285/0x920
[ 63.222902][ C0] ? tty_release_struct+0xe0/0xe0
[ 63.222906][ C0] task_work_run+0xdd/0x190
[ 63.222910][ C0] exit_to_user_mode_prepare+0x1e2/0x1f0
[ 63.222915][ C0] syscall_exit_to_user_mode+0x7a/0x2c0
[ 63.222920][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 63.222923][ C0] RIP: 0033:0x406741
[ 63.222936][ C0] 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 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
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[ 63.222941][ C0] RSP: 002b:00007ffdee97ef70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 63.222951][ C0] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000406741
[ 63.222957][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[ 63.222963][ C0] RBP: 00000000006ddc30 R08: 0000000000000000 R09: 0000000000000000
[ 63.222969][ C0] R10: 00007ffdee97ef90 R11: 0000000000000293 R12: 00000000006ddc3c
[ 63.222975][ C0] R13: 0000000000000001 R14: 000000000000002d R15: 20c49ba5e353f7cf
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