FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.18.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/26361 is trying to acquire lock:
ffffffff8bc8dc00 (console_owner){..-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1874 [inline]
ffffffff8bc8dc00 (console_owner){..-.}-{0:0}, at: vprintk_emit+0x316/0x5f0 kernel/printk/printk.c:2271

but task is already holding lock:
ffff88807db4a958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 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}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
       tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:306
       tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:48
       serial8250_tx_chars+0x4f3/0xa50 drivers/tty/serial/8250/8250_port.c:1866
       serial8250_handle_irq.part.0+0x328/0x3d0 drivers/tty/serial/8250/8250_port.c:1953
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1926 [inline]
       serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1970
       serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126
       __handle_irq_event_percpu+0x22b/0x880 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:817
       generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
       handle_irq arch/x86/kernel/irq.c:231 [inline]
       __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250
       common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240
       asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:636
       native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
       arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
       acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
       acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
       acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:691
       cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
       cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
       call_cpuidle kernel/sched/idle.c:155 [inline]
       cpuidle_idle_call kernel/sched/idle.c:236 [inline]
       do_idle+0x3e8/0x590 kernel/sched/idle.c:303
       cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
       start_kernel+0x47f/0x4a0 init/main.c:1140
       secondary_startup_64_no_verify+0xc3/0xcb

-> #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:162
       serial8250_console_write+0x91a/0xb70 drivers/tty/serial/8250/8250_port.c:3358
       call_console_drivers kernel/printk/printk.c:1952 [inline]
       console_unlock+0x9bc/0xdd0 kernel/printk/printk.c:2774
       vprintk_emit+0x1b4/0x5f0 kernel/printk/printk.c:2272
       vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
       _printk+0xba/0xed kernel/printk/printk.c:2293
       register_console kernel/printk/printk.c:3131 [inline]
       register_console+0x410/0x7c0 kernel/printk/printk.c:3012
       univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:679
       console_init+0x3c1/0x58d kernel/printk/printk.c:3231
       start_kernel+0x30b/0x4a0 init/main.c:1068
       secondary_startup_64_no_verify+0xc3/0xcb

-> #0 (console_owner){..-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3065 [inline]
       check_prevs_add kernel/locking/lockdep.c:3188 [inline]
       validate_chain kernel/locking/lockdep.c:3803 [inline]
       __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029
       lock_acquire kernel/locking/lockdep.c:5641 [inline]
       lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
       console_trylock_spinning kernel/printk/printk.c:1895 [inline]
       vprintk_emit+0x353/0x5f0 kernel/printk/printk.c:2271
       vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
       _printk+0xba/0xed kernel/printk/printk.c:2293
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail+0x472/0x5a0 lib/fault-inject.c:146
       should_failslab+0x5/0x10 mm/slab_common.c:1313
       slab_pre_alloc_hook mm/slab.h:724 [inline]
       slab_alloc mm/slab.c:3299 [inline]
       __do_kmalloc mm/slab.c:3708 [inline]
       __kmalloc+0x7b/0x4d0 mm/slab.c:3719
       kmalloc include/linux/slab.h:586 [inline]
       tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
       __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
       tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
       tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
       pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
       tty_put_char+0x122/0x150 drivers/tty/tty_io.c:3144
       do_output_char+0x155/0x850 drivers/tty/n_tty.c:476
       __process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:722
       flush_echoes drivers/tty/n_tty.c:812 [inline]
       __receive_buf drivers/tty/n_tty.c:1551 [inline]
       n_tty_receive_buf_common+0x1699/0x4780 drivers/tty/n_tty.c:1645
       tiocsti drivers/tty/tty_io.c:2293 [inline]
       tty_ioctl+0x909/0x15e0 drivers/tty/tty_io.c:2692
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x44/0xae

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 ***

5 locks held by syz-executor.4/26361:
 #0: ffff888020533098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffff88807dd9b8b8 (&port->buf.lock/1){+.+.}-{3:3}, at: tiocsti drivers/tty/tty_io.c:2291 [inline]
 #1: ffff88807dd9b8b8 (&port->buf.lock/1){+.+.}-{3:3}, at: tty_ioctl+0x89f/0x15e0 drivers/tty/tty_io.c:2692
 #2: ffff8880205332e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: n_tty_receive_buf_common+0x84/0x4780 drivers/tty/n_tty.c:1608
 #3: ffffc90015d23378 (&ldata->output_lock){+.+.}-{3:3}, at: flush_echoes drivers/tty/n_tty.c:810 [inline]
 #3: ffffc90015d23378 (&ldata->output_lock){+.+.}-{3:3}, at: __receive_buf drivers/tty/n_tty.c:1551 [inline]
 #3: ffffc90015d23378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_receive_buf_common+0x1663/0x4780 drivers/tty/n_tty.c:1645
 #4: ffff88807db4a958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120

stack backtrace:
CPU: 0 PID: 26361 Comm: syz-executor.4 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2145
 check_prev_add kernel/locking/lockdep.c:3065 [inline]
 check_prevs_add kernel/locking/lockdep.c:3188 [inline]
 validate_chain kernel/locking/lockdep.c:3803 [inline]
 __lock_acquire+0x2ac6/0x56c0 kernel/locking/lockdep.c:5029
 lock_acquire kernel/locking/lockdep.c:5641 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
 console_trylock_spinning kernel/printk/printk.c:1895 [inline]
 vprintk_emit+0x353/0x5f0 kernel/printk/printk.c:2271
 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
 _printk+0xba/0xed kernel/printk/printk.c:2293
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail+0x472/0x5a0 lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1313
 slab_pre_alloc_hook mm/slab.h:724 [inline]
 slab_alloc mm/slab.c:3299 [inline]
 __do_kmalloc mm/slab.c:3708 [inline]
 __kmalloc+0x7b/0x4d0 mm/slab.c:3719
 kmalloc include/linux/slab.h:586 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
 tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
 tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
 pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
 tty_put_char+0x122/0x150 drivers/tty/tty_io.c:3144
 do_output_char+0x155/0x850 drivers/tty/n_tty.c:476
 __process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:722
 flush_echoes drivers/tty/n_tty.c:812 [inline]
 __receive_buf drivers/tty/n_tty.c:1551 [inline]
 n_tty_receive_buf_common+0x1699/0x4780 drivers/tty/n_tty.c:1645
 tiocsti drivers/tty/tty_io.c:2293 [inline]
 tty_ioctl+0x909/0x15e0 drivers/tty/tty_io.c:2692
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fbb658890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb66a2d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb6599bf60 RCX: 00007fbb658890e9
RDX: 0000000020000080 RSI: 0000000000005412 RDI: 0000000000000005
RBP: 00007fbb66a2d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffff19daff R14: 00007fbb66a2d300 R15: 0000000000022000
 </TASK>
CPU: 0 PID: 26361 Comm: syz-executor.4 Not tainted 5.18.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail.cold+0x5/0xa lib/fault-inject.c:146
 should_failslab+0x5/0x10 mm/slab_common.c:1313
 slab_pre_alloc_hook mm/slab.h:724 [inline]
 slab_alloc mm/slab.c:3299 [inline]
 __do_kmalloc mm/slab.c:3708 [inline]
 __kmalloc+0x7b/0x4d0 mm/slab.c:3719
 kmalloc include/linux/slab.h:586 [inline]
 tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
 __tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
 tty_insert_flip_string_fixed_flag+0x8c/0x240 drivers/tty/tty_buffer.c:321
 tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
 pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
 tty_put_char+0x122/0x150 drivers/tty/tty_io.c:3144
 do_output_char+0x155/0x850 drivers/tty/n_tty.c:476
 __process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:722
 flush_echoes drivers/tty/n_tty.c:812 [inline]
 __receive_buf drivers/tty/n_tty.c:1551 [inline]
 n_tty_receive_buf_common+0x1699/0x4780 drivers/tty/n_tty.c:1645
 tiocsti drivers/tty/tty_io.c:2293 [inline]
 tty_ioctl+0x909/0x15e0 drivers/tty/tty_io.c:2692
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fbb658890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb66a2d168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb6599bf60 RCX: 00007fbb658890e9
RDX: 0000000020000080 RSI: 0000000000005412 RDI: 0000000000000005
RBP: 00007fbb66a2d1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffff19daff R14: 00007fbb66a2d300 R15: 0000000000022000
 </TASK>