syzbot

======================================================
WARNING: possible circular locking dependency detected
5.11.0-rc7-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor895/9972 is trying to acquire lock:
ffffffff8bc82ca0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1778 [inline]
ffffffff8bc82ca0 (console_owner){....}-{0:0}, at: vprintk_emit+0x282/0x490 kernel/printk/printk.c:2091

but task is already holding lock:
ffffffff906974f8 (&port->lock){-.-.}-{2:2}, at: tty_port_close_start.part.0+0x28/0x550 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}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
       tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:288
       tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47
       serial8250_tx_chars+0x487/0xa80 drivers/tty/serial/8250/8250_port.c:1832
       serial8250_handle_irq.part.0+0x328/0x3d0 drivers/tty/serial/8250/8250_port.c:1919
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1892 [inline]
       serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1935
       serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126
       __handle_irq_event_percpu+0x303/0x8f0 kernel/irq/handle.c:156
       handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
       handle_irq_event+0x102/0x290 kernel/irq/handle.c:213
       handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:819
       asm_call_irq_on_stack+0xf/0x20
       __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline]
       run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline]
       handle_irq arch/x86/kernel/irq.c:230 [inline]
       __common_interrupt arch/x86/kernel/irq.c:249 [inline]
       common_interrupt+0x120/0x200 arch/x86/kernel/irq.c:239
       asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:620
       native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
       arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
       spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
       uart_write+0x30d/0x570 drivers/tty/serial/serial_core.c:615
       do_output_char+0x5de/0x850 drivers/tty/n_tty.c:448
       process_output drivers/tty/n_tty.c:515 [inline]
       n_tty_write+0x4c3/0xfd0 drivers/tty/n_tty.c:2344
       do_tty_write drivers/tty/tty_io.c:961 [inline]
       file_tty_write.constprop.0+0x521/0x8f0 drivers/tty/tty_io.c:1048
       redirected_tty_write+0xa1/0xc0 drivers/tty/tty_io.c:1055
       call_write_iter include/linux/fs.h:1901 [inline]
       do_iter_readv_writev+0x46f/0x740 fs/read_write.c:740
       do_iter_write+0x188/0x670 fs/read_write.c:866
       vfs_writev+0x1aa/0x620 fs/read_write.c:939
       do_writev+0x139/0x300 fs/read_write.c:982
       do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
       serial8250_console_write+0x880/0xa90 drivers/tty/serial/8250/8250_port.c:3292
       call_console_drivers kernel/printk/printk.c:1856 [inline]
       console_unlock+0x841/0xbb0 kernel/printk/printk.c:2570
       vprintk_emit+0x189/0x490 kernel/printk/printk.c:2092
       vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
       printk+0xba/0xed kernel/printk/printk.c:2140
       register_console kernel/printk/printk.c:2921 [inline]
       register_console+0x5d1/0x800 kernel/printk/printk.c:2801
       univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:690
       console_init+0x3c7/0x596 kernel/printk/printk.c:3021
       start_kernel+0x2fc/0x48c init/main.c:989
       secondary_startup_64_no_verify+0xb0/0xbb

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2868 [inline]
       check_prevs_add kernel/locking/lockdep.c:2993 [inline]
       validate_chain kernel/locking/lockdep.c:3608 [inline]
       __lock_acquire+0x2b26/0x54f0 kernel/locking/lockdep.c:4832
       lock_acquire kernel/locking/lockdep.c:5442 [inline]
       lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407
       console_trylock_spinning kernel/printk/printk.c:1799 [inline]
       vprintk_emit+0x2bf/0x490 kernel/printk/printk.c:2091
       vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
       printk+0xba/0xed kernel/printk/printk.c:2140
       tty_port_close_start.part.0+0x503/0x550 drivers/tty/tty_port.c:569
       tty_port_close_start drivers/tty/tty_port.c:641 [inline]
       tty_port_close+0x46/0x170 drivers/tty/tty_port.c:634
       tty_release+0x45e/0x1210 drivers/tty/tty_io.c:1694
       __fput+0x283/0x920 fs/file_table.c:280
       task_work_run+0xdd/0x190 kernel/task_work.c:140
       tracehook_notify_resume include/linux/tracehook.h:189 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
       exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
       __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
       syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

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 ***

2 locks held by syz-executor895/9972:
 #0: ffff8880196361c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0xbd/0x120 drivers/tty/tty_mutex.c:19
 #1: ffffffff906974f8 (&port->lock){-.-.}-{2:2}, at: tty_port_close_start.part.0+0x28/0x550 drivers/tty/tty_port.c:567

stack backtrace:
CPU: 1 PID: 9972 Comm: syz-executor895 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2117
 check_prev_add kernel/locking/lockdep.c:2868 [inline]
 check_prevs_add kernel/locking/lockdep.c:2993 [inline]
 validate_chain kernel/locking/lockdep.c:3608 [inline]
 __lock_acquire+0x2b26/0x54f0 kernel/locking/lockdep.c:4832
 lock_acquire kernel/locking/lockdep.c:5442 [inline]
 lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407
 console_trylock_spinning kernel/printk/printk.c:1799 [inline]
 vprintk_emit+0x2bf/0x490 kernel/printk/printk.c:2091
 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2140
 tty_port_close_start.part.0+0x503/0x550 drivers/tty/tty_port.c:569
 tty_port_close_start drivers/tty/tty_port.c:641 [inline]
 tty_port_close+0x46/0x170 drivers/tty/tty_port.c:634
 tty_release+0x45e/0x1210 drivers/tty/tty_io.c:1694
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x40a51b
Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44
RSP: 002b:00007ffeb88b7090 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000040a51b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000000129ac R08: 0000000000000000 R09: 00007ffe00000001
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000004d04fc
R13: 00007ffeb88b72e0 R14: 00000000004d04e0 R15: 00007ffeb88b7160