====================================================== WARNING: possible circular locking dependency detected 5.10.148 #1 Not tainted ------------------------------------------------------ syz-executor.6/14696 is trying to acquire lock: ffff888039940578 (&tty->read_wait){....}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff888039940578 (&tty->read_wait){....}-{2:2}, at: io_poll_double_wake+0x1f8/0x550 fs/io_uring.c:5062 but task is already holding lock: ffff888039940528 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up_common_lock+0xb4/0x140 kernel/sched/wait.c:122 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&tty->write_wait){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x60 kernel/locking/spinlock.c:159 __wake_up_common_lock+0xb4/0x140 kernel/sched/wait.c:122 tty_port_default_wakeup+0x26/0x40 drivers/tty/tty_port.c:50 serial8250_tx_chars+0x516/0xb00 drivers/tty/serial/8250/8250_port.c:1842 serial8250_handle_irq.part.0+0x3f5/0x4c0 drivers/tty/serial/8250/8250_port.c:1929 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1902 [inline] serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1945 serial8250_interrupt+0xf4/0x1b0 drivers/tty/serial/8250/8250_core.c:127 __handle_irq_event_percpu+0x2ef/0x820 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0xff/0x280 kernel/irq/handle.c:213 handle_edge_irq+0x249/0xd00 kernel/irq/chip.c:822 asm_call_irq_on_stack+0x12/0x20 __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+0xdd/0x190 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:626 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0xe/0x20 arch/x86/kernel/process.c:689 default_idle_call+0x8b/0xd0 kernel/sched/idle.c:112 cpuidle_idle_call kernel/sched/idle.c:194 [inline] do_idle+0x3ad/0x520 kernel/sched/idle.c:300 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396 secondary_startup_64_no_verify+0xc2/0xcb -> #3 (&port_lock_key){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x60 kernel/locking/spinlock.c:159 serial8250_console_write+0x90f/0xb60 drivers/tty/serial/8250/8250_port.c:3323 call_console_drivers kernel/printk/printk.c:1911 [inline] console_unlock+0x82a/0xb40 kernel/printk/printk.c:2532 register_console kernel/printk/printk.c:2873 [inline] register_console+0x53d/0x800 kernel/printk/printk.c:2763 univ8250_console_init+0x3a/0x4a drivers/tty/serial/8250/8250_core.c:694 console_init+0x361/0x4fa kernel/printk/printk.c:2983 start_kernel+0x2e1/0x48e init/main.c:982 secondary_startup_64_no_verify+0xc2/0xcb -> #2 (console_owner){-.-.}-{0:0}: console_lock_spinning_enable kernel/printk/printk.c:1763 [inline] console_unlock+0x360/0xb40 kernel/printk/printk.c:2529 vprintk_emit+0x1de/0x4d0 kernel/printk/printk.c:2054 vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 printk+0xba/0xf1 kernel/printk/printk.c:2102 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x47a/0x5a0 lib/fault-inject.c:146 should_failslab+0x5/0x20 mm/slab_common.c:1193 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2904 [inline] kmem_cache_alloc+0x5b/0x360 mm/slub.c:2909 __sigqueue_alloc+0x1ee/0x560 kernel/signal.c:435 __send_signal+0x5e2/0x1040 kernel/signal.c:1116 do_send_sig_info kernel/signal.c:1291 [inline] send_sig_info kernel/signal.c:1606 [inline] send_sig+0xcb/0x160 kernel/signal.c:1616 sk_stream_error+0xae/0x100 net/core/stream.c:188 tcp_sendmsg_locked+0x1636/0x2f20 net/ipv4/tcp.c:1433 tcp_sendmsg+0x2b/0x50 net/ipv4/tcp.c:1448 inet6_sendmsg+0xb5/0x140 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xf2/0x190 net/socket.c:671 ____sys_sendmsg+0x70d/0x870 net/socket.c:2342 ___sys_sendmsg+0xf3/0x170 net/socket.c:2396 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2429 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 -> #1 (&sighand->siglock){-...}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x60 kernel/locking/spinlock.c:159 __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391 lock_task_sighand include/linux/sched/signal.h:693 [inline] task_work_add+0x1df/0x2b0 kernel/task_work.c:58 io_req_task_work_add fs/io_uring.c:2069 [inline] __io_async_wake+0x40b/0x8d0 fs/io_uring.c:4949 __wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93 __wake_up_common_lock+0xd0/0x140 kernel/sched/wait.c:123 tty_ldisc_lock+0x40/0xb0 drivers/tty/tty_ldisc.c:335 tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744 __tty_hangup.part.0+0x510/0x9b0 drivers/tty/tty_io.c:624 __tty_hangup drivers/tty/tty_io.c:574 [inline] tty_vhangup drivers/tty/tty_io.c:697 [inline] tty_ioctl+0x1212/0x1840 drivers/tty/tty_io.c:2683 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 -> #0 (&tty->read_wait){....}-{2:2}: check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3728 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5565 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5530 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_poll_double_wake+0x1f8/0x550 fs/io_uring.c:5062 __wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93 __wake_up_common_lock+0xd0/0x140 kernel/sched/wait.c:123 tty_ldisc_lock+0x55/0xb0 drivers/tty/tty_ldisc.c:336 tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744 __tty_hangup.part.0+0x510/0x9b0 drivers/tty/tty_io.c:624 __tty_hangup drivers/tty/tty_io.c:574 [inline] tty_vhangup drivers/tty/tty_io.c:697 [inline] tty_ioctl+0x1212/0x1840 drivers/tty/tty_io.c:2683 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 other info that might help us debug this: Chain exists of: &tty->read_wait --> &port_lock_key --> &tty->write_wait Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&tty->write_wait); lock(&port_lock_key); lock(&tty->write_wait); lock(&tty->read_wait); *** DEADLOCK *** 2 locks held by syz-executor.6/14696: #0: ffff8880399401c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_lock+0xbd/0x120 drivers/tty/tty_mutex.c:19 #1: ffff888039940528 (&tty->write_wait){-.-.}-{2:2}, at: __wake_up_common_lock+0xb4/0x140 kernel/sched/wait.c:122 stack backtrace: CPU: 1 PID: 14696 Comm: syz-executor.6 Not tainted 5.10.148 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 check_noncircular+0x263/0x2e0 kernel/locking/lockdep.c:2123 check_prev_add kernel/locking/lockdep.c:2988 [inline] check_prevs_add kernel/locking/lockdep.c:3113 [inline] validate_chain kernel/locking/lockdep.c:3728 [inline] __lock_acquire+0x29e7/0x5b00 kernel/locking/lockdep.c:4954 lock_acquire kernel/locking/lockdep.c:5565 [inline] lock_acquire+0x197/0x490 kernel/locking/lockdep.c:5530 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x27/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] io_poll_double_wake+0x1f8/0x550 fs/io_uring.c:5062 __wake_up_common+0x14c/0x4c0 kernel/sched/wait.c:93 __wake_up_common_lock+0xd0/0x140 kernel/sched/wait.c:123 tty_ldisc_lock+0x55/0xb0 drivers/tty/tty_ldisc.c:336 tty_ldisc_hangup+0x204/0x690 drivers/tty/tty_ldisc.c:744 __tty_hangup.part.0+0x510/0x9b0 drivers/tty/tty_io.c:624 __tty_hangup drivers/tty/tty_io.c:574 [inline] tty_vhangup drivers/tty/tty_io.c:697 [inline] tty_ioctl+0x1212/0x1840 drivers/tty/tty_io.c:2683 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x19a/0x210 fs/ioctl.c:739 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f4974ddeb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4972354188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4974ef1f60 RCX: 00007f4974ddeb19 RDX: 0000000000000000 RSI: 0000000000005437 RDI: 0000000000000004 RBP: 00007f4974e38f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdeb39f64f R14: 00007f4972354300 R15: 0000000000022000 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.7'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.7'.