======================================================
WARNING: possible circular locking dependency detected
5.9.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/14197 is trying to acquire lock:
ffffffff894fc9c0 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning+0x149/0x300 kernel/printk/printk.c:1764

but task is already holding lock:
ffff88809fa5e958 (&port->lock#2){-.-.}-{2:2}, at: pty_write+0xb6/0x180 drivers/tty/pty.c:120

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&port->lock#2){-.-.}-{2:2}:
       lock_acquire+0x140/0x6f0 kernel/locking/lockdep.c:5006
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xaa/0xd0 kernel/locking/spinlock.c:159
       tty_port_tty_get+0x21/0xe0 drivers/tty/tty_port.c:288
       tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:47
       serial8250_tx_chars+0x5ea/0x800 drivers/tty/serial/8250/8250_port.c:1832
       serial8250_handle_irq+0x2fd/0x3e0 drivers/tty/serial/8250/8250_port.c:1919
       serial8250_default_handle_irq+0xac/0x190 drivers/tty/serial/8250/8250_port.c:1935
       serial8250_interrupt+0x93/0x180 drivers/tty/serial/8250/8250_core.c:126
       __handle_irq_event_percpu+0x1f1/0x6e0 kernel/irq/handle.c:156
       handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
       handle_irq_event+0xbd/0x280 kernel/irq/handle.c:213
       handle_edge_irq+0x245/0xbf0 kernel/irq/chip.c:819
       asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
       __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
       run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
       handle_irq arch/x86/kernel/irq.c:230 [inline]
       __common_interrupt arch/x86/kernel/irq.c:249 [inline]
       common_interrupt+0x13c/0x230 arch/x86/kernel/irq.c:239
       asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:572
       arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irqrestore+0x63/0x90 kernel/locking/spinlock.c:191
       spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
       uart_write+0x767/0x8f0 drivers/tty/serial/serial_core.c:615
       do_output_char+0x63b/0x940 drivers/tty/n_tty.c:447
       process_output drivers/tty/n_tty.c:514 [inline]
       n_tty_write+0xd5c/0x1170 drivers/tty/n_tty.c:2345
       do_tty_write drivers/tty/tty_io.c:962 [inline]
       tty_write+0x593/0x940 drivers/tty/tty_io.c:1046
       do_loop_readv_writev fs/read_write.c:737 [inline]
       do_iter_write+0x441/0x610 fs/read_write.c:1020
       vfs_writev fs/read_write.c:1091 [inline]
       do_writev+0x23f/0x4a0 fs/read_write.c:1134
       do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

-> #1 (&port->lock){-.-.}-{2:2}:
       lock_acquire+0x140/0x6f0 kernel/locking/lockdep.c:5006
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xaa/0xd0 kernel/locking/spinlock.c:159
       serial8250_console_write+0x145/0xd10 drivers/tty/serial/8250/8250_port.c:3289
       call_console_drivers kernel/printk/printk.c:1822 [inline]
       console_unlock+0x94c/0xe20 kernel/printk/printk.c:2501
       vprintk_emit+0x205/0x370 kernel/printk/printk.c:2029
       printk+0x62/0x83 kernel/printk/printk.c:2078
       register_console+0x7a6/0xab0 kernel/printk/printk.c:2854
       univ8250_console_init+0x41/0x43 drivers/tty/serial/8250/8250_core.c:690
       console_init+0x52/0x97 kernel/printk/printk.c:2954
       start_kernel+0x319/0x57c init/main.c:975
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:2496 [inline]
       check_prevs_add kernel/locking/lockdep.c:2601 [inline]
       validate_chain+0x1b0c/0x88a0 kernel/locking/lockdep.c:3218
       __lock_acquire+0x110b/0x2ae0 kernel/locking/lockdep.c:4426
       lock_acquire+0x140/0x6f0 kernel/locking/lockdep.c:5006
       console_trylock_spinning+0x169/0x300 kernel/printk/printk.c:1781
       vprintk_emit+0x1e8/0x370 kernel/printk/printk.c:2028
       printk+0x62/0x83 kernel/printk/printk.c:2078
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x36c/0x4e0 lib/fault-inject.c:146
       should_failslab+0x5/0x20 mm/slab_common.c:1194
       slab_pre_alloc_hook+0x4c/0xe0 mm/slab.h:500
       slab_alloc mm/slab.c:3298 [inline]
       __do_kmalloc mm/slab.c:3653 [inline]
       __kmalloc+0x6c/0x300 mm/slab.c:3664
       kmalloc include/linux/slab.h:559 [inline]
       tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
       __tty_buffer_request_room+0x1f3/0x540 drivers/tty/tty_buffer.c:273
       tty_insert_flip_string_fixed_flag+0x91/0x2c0 drivers/tty/tty_buffer.c:318
       tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
       pty_write+0xda/0x180 drivers/tty/pty.c:122
       n_tty_write+0x584/0x1170 drivers/tty/n_tty.c:2356
       do_tty_write drivers/tty/tty_io.c:962 [inline]
       tty_write+0x593/0x940 drivers/tty/tty_io.c:1046
       vfs_write+0x2d3/0xd10 fs/read_write.c:576
       ksys_write+0x11b/0x220 fs/read_write.c:631
       do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
       entry_SYSCALL_64_after_hwframe+0x44/0xa9

other info that might help us debug this:

Chain exists of:
  console_owner --> &port->lock --> &port->lock#2

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&port->lock#2);
                               lock(&port->lock);
                               lock(&port->lock#2);
  lock(console_owner);

 *** DEADLOCK ***

5 locks held by syz-executor.0/14197:
 #0: ffff888093955098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:267
 #1: ffff888093955130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:888 [inline]
 #1: ffff888093955130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:911 [inline]
 #1: ffff888093955130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write+0x22c/0x940 drivers/tty/tty_io.c:1046
 #2: ffff8880939552e8 (&tty->termios_rwsem){++++}-{3:3}, at: n_tty_write+0x1e0/0x1170 drivers/tty/n_tty.c:2316
 #3: ffffc9000a239378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0x53a/0x1170 drivers/tty/n_tty.c:2355
 #4: ffff88809fa5e958 (&port->lock#2){-.-.}-{2:2}, at: pty_write+0xb6/0x180 drivers/tty/pty.c:120

stack backtrace:
CPU: 1 PID: 14197 Comm: syz-executor.0 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d6/0x29e lib/dump_stack.c:118
 print_circular_bug+0xc72/0xea0 kernel/locking/lockdep.c:1703
 check_noncircular+0x1fb/0x3a0 kernel/locking/lockdep.c:1827
 check_prev_add kernel/locking/lockdep.c:2496 [inline]
 check_prevs_add kernel/locking/lockdep.c:2601 [inline]
 validate_chain+0x1b0c/0x88a0 kernel/locking/lockdep.c:3218
 __lock_acquire+0x110b/0x2ae0 kernel/locking/lockdep.c:4426
 lock_acquire+0x140/0x6f0 kernel/locking/lockdep.c:5006
 console_trylock_spinning+0x169/0x300 kernel/printk/printk.c:1781
 vprintk_emit+0x1e8/0x370 kernel/printk/printk.c:2028
 printk+0x62/0x83 kernel/printk/printk.c:2078
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x36c/0x4e0 lib/fault-inject.c:146
 should_failslab+0x5/0x20 mm/slab_common.c:1194
 slab_pre_alloc_hook+0x4c/0xe0 mm/slab.h:500
 slab_alloc mm/slab.c:3298 [inline]
 __do_kmalloc mm/slab.c:3653 [inline]
 __kmalloc+0x6c/0x300 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
 __tty_buffer_request_room+0x1f3/0x540 drivers/tty/tty_buffer.c:273
 tty_insert_flip_string_fixed_flag+0x91/0x2c0 drivers/tty/tty_buffer.c:318
 tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
 pty_write+0xda/0x180 drivers/tty/pty.c:122
 n_tty_write+0x584/0x1170 drivers/tty/n_tty.c:2356
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x593/0x940 drivers/tty/tty_io.c:1046
 vfs_write+0x2d3/0xd10 fs/read_write.c:576
 ksys_write+0x11b/0x220 fs/read_write.c:631
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdb8132ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000038b00 RCX: 000000000045d5b9
RDX: 00000000ae9d808f RSI: 00000000200002c0 RDI: 0000000000000003
RBP: 00007fdb8132aca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffda4923adf R14: 00007fdb8132b9c0 R15: 000000000118cf4c