======================================================
WARNING: possible circular locking dependency detected
5.12.0-rc3-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/3654 is trying to acquire lock:
82a41234 (console_owner){-...}-{0:0}, at: console_unlock+0x19c/0x7c8 kernel/printk/printk.c:2551
but task is already holding lock:
833b8cb4 (&port->lock){....}-{2:2}, at: tty_port_close_start.part.0+0x24/0x1a4 drivers/tty/tty_port.c:567
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&port->lock){....}-{2:2}:
lock_acquire+0x6c/0x74 kernel/locking/lockdep.c:5483
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x54/0x70 kernel/locking/spinlock.c:159
tty_port_tty_get+0x1c/0x88 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x10/0x28 drivers/tty/tty_port.c:47
tty_port_tty_wakeup+0x18/0x1c drivers/tty/tty_port.c:388
uart_write_wakeup+0x1c/0x24 drivers/tty/serial/serial_core.c:106
pl011_tx_chars+0x278/0x2d0 drivers/tty/serial/amba-pl011.c:1417
pl011_start_tx_pio drivers/tty/serial/amba-pl011.c:1302 [inline]
pl011_start_tx+0xc8/0x1a0 drivers/tty/serial/amba-pl011.c:1314
__uart_start+0x50/0x54 drivers/tty/serial/serial_core.c:127
uart_write+0xf0/0x204 drivers/tty/serial/serial_core.c:614
process_output_block drivers/tty/n_tty.c:591 [inline]
n_tty_write+0x218/0x508 drivers/tty/n_tty.c:2353
do_tty_write drivers/tty/tty_io.c:1043 [inline]
file_tty_write.constprop.0+0x178/0x2ec drivers/tty/tty_io.c:1133
tty_write drivers/tty/tty_io.c:1140 [inline]
redirected_tty_write drivers/tty/tty_io.c:1162 [inline]
redirected_tty_write+0x98/0xa4 drivers/tty/tty_io.c:1143
call_write_iter include/linux/fs.h:1977 [inline]
new_sync_write fs/read_write.c:518 [inline]
vfs_write+0x260/0x350 fs/read_write.c:605
ksys_write+0x68/0xec fs/read_write.c:658
__do_sys_write fs/read_write.c:670 [inline]
sys_write+0x10/0x14 fs/read_write.c:667
ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64
0x7e8b1410
-> #1 (&port_lock_key){-...}-{2:2}:
lock_acquire+0x6c/0x74 kernel/locking/lockdep.c:5483
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x44/0x54 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
pl011_console_write+0x16c/0x1bc drivers/tty/serial/amba-pl011.c:2215
call_console_drivers kernel/printk/printk.c:1862 [inline]
console_unlock+0x31c/0x7c8 kernel/printk/printk.c:2576
register_console kernel/printk/printk.c:2917 [inline]
register_console+0x204/0x350 kernel/printk/printk.c:2807
uart_configure_port drivers/tty/serial/serial_core.c:2393 [inline]
uart_add_one_port+0x4d4/0x4fc drivers/tty/serial/serial_core.c:2906
pl011_register_port+0x64/0xdc drivers/tty/serial/amba-pl011.c:2638
pl011_probe+0x138/0x154 drivers/tty/serial/amba-pl011.c:2679
amba_probe+0xa4/0x128 drivers/amba/bus.c:207
really_probe+0x100/0x50c drivers/base/dd.c:554
driver_probe_device+0xf8/0x1c8 drivers/base/dd.c:740
__device_attach_driver+0x8c/0xf0 drivers/base/dd.c:846
bus_for_each_drv+0x88/0xd8 drivers/base/bus.c:431
__device_attach+0xdc/0x1d0 drivers/base/dd.c:914
device_initial_probe+0x14/0x18 drivers/base/dd.c:961
bus_probe_device+0x90/0x98 drivers/base/bus.c:491
device_add+0x324/0x828 drivers/base/core.c:3242
amba_device_try_add+0x58/0x304 drivers/amba/bus.c:468
amba_deferred_retry+0x48/0xac drivers/amba/bus.c:523
amba_deferred_retry_func+0x10/0x48 drivers/amba/bus.c:540
process_one_work+0x2d4/0x998 kernel/workqueue.c:2275
worker_thread+0x64/0x54c kernel/workqueue.c:2421
kthread+0x184/0x1a4 kernel/kthread.c:292
ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158
0x0
-> #0 (console_owner){-...}-{0:0}:
check_prev_add kernel/locking/lockdep.c:2936 [inline]
check_prevs_add kernel/locking/lockdep.c:3059 [inline]
validate_chain kernel/locking/lockdep.c:3674 [inline]
__lock_acquire+0x182c/0x3318 kernel/locking/lockdep.c:4900
lock_acquire.part.0+0xf0/0x41c kernel/locking/lockdep.c:5510
lock_acquire+0x6c/0x74 kernel/locking/lockdep.c:5483
console_lock_spinning_enable kernel/printk/printk.c:1714 [inline]
console_unlock+0x218/0x7c8 kernel/printk/printk.c:2573
vprintk_emit+0x104/0x364 kernel/printk/printk.c:2098
vprintk_default+0x28/0x30 kernel/printk/printk.c:2115
vprintk_func+0xfc/0x1c4 kernel/printk/printk_safe.c:401
printk+0x34/0x5c kernel/printk/printk.c:2146
tty_port_close_start.part.0+0x19c/0x1a4 drivers/tty/tty_port.c:569
tty_port_close_start drivers/tty/tty_port.c:564 [inline]
tty_port_close+0x30/0x9c drivers/tty/tty_port.c:634
tpk_close+0x58/0x80 drivers/char/ttyprintk.c:110
tty_release+0x120/0x610 drivers/tty/tty_io.c:1779
__fput+0x9c/0x264 fs/file_table.c:280
____fput+0x10/0x14 fs/file_table.c:313
task_work_run+0xa0/0xdc kernel/task_work.c:140
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_work_pending+0x520/0x648 arch/arm/kernel/signal.c:672
slow_work_pending+0xc/0x20
0x29328
other info that might help us debug this:
Chain exists of:
console_owner --> &port_lock_key --> &port->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&port->lock);
lock(&port_lock_key);
lock(&port->lock);
lock(console_owner);
*** DEADLOCK ***
3 locks held by syz-executor.0/3654:
#0: 86cb20f0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0x68/0xb0 drivers/tty/tty_mutex.c:19
#1: 833b8cb4 (&port->lock){....}-{2:2}, at: tty_port_close_start.part.0+0x24/0x1a4 drivers/tty/tty_port.c:567
#2: 82a41150 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x28/0x30 kernel/printk/printk.c:2115
stack backtrace:
CPU: 1 PID: 3654 Comm: syz-executor.0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace:
[<81802550>] (dump_backtrace) from [<818027c4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
r7:00000080 r6:60000093 r5:00000000 r4:82b58344
[<818027ac>] (show_stack) from [<81809e98>] (__dump_stack lib/dump_stack.c:79 [inline])
[<818027ac>] (show_stack) from [<81809e98>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<81809de0>] (dump_stack) from [<802b97b4>] (print_circular_bug+0x308/0x35c kernel/locking/lockdep.c:2005)
r7:865e47a8 r6:830dbc0c r5:830e2520 r4:830cba3c
[<802b94ac>] (print_circular_bug) from [<802b990c>] (check_noncircular+0x104/0x170 kernel/locking/lockdep.c:2127)
r10:00000003 r9:830cb7e4 r8:81f47d20 r7:00000000 r6:86c67b10 r5:865e47a8
r4:865e47e8
[<802b9808>] (check_noncircular) from [<802bd4b4>] (check_prev_add kernel/locking/lockdep.c:2936 [inline])
[<802b9808>] (check_noncircular) from [<802bd4b4>] (check_prevs_add kernel/locking/lockdep.c:3059 [inline])
[<802b9808>] (check_noncircular) from [<802bd4b4>] (validate_chain kernel/locking/lockdep.c:3674 [inline])
[<802b9808>] (check_noncircular) from [<802bd4b4>] (__lock_acquire+0x182c/0x3318 kernel/locking/lockdep.c:4900)
r7:83278fe8 r6:81f4cd38 r5:865e47a8 r4:830cba3c
[<802bbc88>] (__lock_acquire) from [<802bfb90>] (lock_acquire.part.0+0xf0/0x41c kernel/locking/lockdep.c:5510)
r10:00000080 r9:60000093 r8:00000000 r7:00000000 r6:828a2680 r5:828a2680
r4:86c67b90
[<802bfaa0>] (lock_acquire.part.0) from [<802bff28>] (lock_acquire+0x6c/0x74 kernel/locking/lockdep.c:5483)
r10:802d3f7c r9:00000000 r8:00000001 r7:00000000 r6:00000000 r5:00000000
r4:82a41234
[<802bfebc>] (lock_acquire) from [<802d3ff8>] (console_lock_spinning_enable kernel/printk/printk.c:1714 [inline])
[<802bfebc>] (lock_acquire) from [<802d3ff8>] (console_unlock+0x218/0x7c8 kernel/printk/printk.c:2573)
r10:86c67c94 r9:83278a28 r8:81fb9520 r7:82a410e0 r6:83278f58 r5:00000000
r4:00000001
[<802d3de0>] (console_unlock) from [<802d5448>] (vprintk_emit+0x104/0x364 kernel/printk/printk.c:2098)
r10:60000093 r9:ffffffff r8:81fb9520 r7:00000048 r6:83278a28 r5:00000000
r4:82a224f8
[<802d5344>] (vprintk_emit) from [<802d56d0>] (vprintk_default+0x28/0x30 kernel/printk/printk.c:2115)
r10:00000000 r9:833b8de4 r8:81fbe8e0 r7:00000000 r6:81fb9520 r5:86c67ddc
r4:00000000
[<802d56a8>] (vprintk_default) from [<802d6758>] (vprintk_func+0xfc/0x1c4 kernel/printk/printk_safe.c:401)
[<802d665c>] (vprintk_func) from [<81805fa8>] (printk+0x34/0x5c kernel/printk/printk.c:2146)
r7:833b8ca4 r6:60000013 r5:86cb2000 r4:833b8bf4
[<81805f74>] (printk) from [<80948250>] (tty_port_close_start.part.0+0x19c/0x1a4 drivers/tty/tty_port.c:569)
r3:81b18070 r2:86cb228c r1:81fbe8e0 r0:81fb9520
[<809480b4>] (tty_port_close_start.part.0) from [<8094885c>] (tty_port_close_start drivers/tty/tty_port.c:564 [inline])
[<809480b4>] (tty_port_close_start.part.0) from [<8094885c>] (tty_port_close+0x30/0x9c drivers/tty/tty_port.c:634)
r8:833b8bf4 r7:a0000013 r6:8367e3c0 r5:86cb2000 r4:833b8bf4
[<8094882c>] (tty_port_close) from [<8098cf6c>] (tpk_close+0x58/0x80 drivers/char/ttyprintk.c:110)
r7:a0000013 r6:8367e3c0 r5:833b8bf0 r4:86cb2000
[<8098cf14>] (tpk_close) from [<8093eaf4>] (tty_release+0x120/0x610 drivers/tty/tty_io.c:1779)
r10:00000000 r9:865e46f4 r8:8367e3c0 r7:85797f10 r6:00000000 r5:86cb2000
r4:86cb2000 r3:8098cf14
[<8093e9d4>] (tty_release) from [<804dc2e0>] (__fput+0x9c/0x264 fs/file_table.c:280)
r10:5ac3c35a r9:865e46f4 r8:83dfb780 r7:85797f10 r6:000a0001 r5:844e7bd8
r4:8367e3c0
[<804dc244>] (__fput) from [<804dc524>] (____fput+0x10/0x14 fs/file_table.c:313)
r9:865e46f4 r8:81f4a770 r7:82c6ba40 r6:865e4100 r5:865e46a4 r4:00000000
[<804dc514>] (____fput) from [<80270030>] (task_work_run+0xa0/0xdc kernel/task_work.c:140)
[<8026ff90>] (task_work_run) from [<8020ce3c>] (tracehook_notify_resume include/linux/tracehook.h:189 [inline])
[<8026ff90>] (task_work_run) from [<8020ce3c>] (do_work_pending+0x520/0x648 arch/arm/kernel/signal.c:672)
r9:81f42a14 r8:fffffe30 r7:86c66000 r6:80200224 r5:86c67fb0 r4:ffffe000
[<8020c91c>] (do_work_pending) from [<80200098>] (slow_work_pending+0xc/0x20)
Exception stack(0x86c67fb0 to 0x86c67ff8)
7fa0: 00000000 00000002 00000000 00000003
7fc0: 00000004 019264c0 00000008 00000006 001200ac 00000000 00067154 000f4240
7fe0: 00530000 7e914350 00028e6c 00029328 80000010 00000003
r10:00000006 r9:86c66000 r8:80200224 r7:00000006 r6:00000008 r5:019264c0
r4:00000004