RBP: 00007f0f3b989040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000240 R14: 00007f0f3b989000 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 5.10.156 #1 Not tainted ------------------------------------------------------ syz-executor.3/40424 is trying to acquire lock: ffffffff84f0c300 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb40 kernel/printk/printk.c:2507 but task is already holding lock: ffff888046e18958 (&sighand->siglock){-.-.}-{2:2}, at: force_sig_info_to_task+0x6c/0x3b0 kernel/signal.c:1317 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&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 -> #3 (&tty->read_wait){....}-{2:2}: __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 -> #2 (&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+0x51f/0xb00 drivers/tty/serial/8250/8250_port.c:1831 __start_tx drivers/tty/serial/8250/8250_port.c:1550 [inline] serial8250_start_tx+0x695/0xa60 drivers/tty/serial/8250/8250_port.c:1655 __uart_start.isra.0+0x17c/0x1c0 drivers/tty/serial/serial_core.c:132 uart_write+0x2f2/0x580 drivers/tty/serial/serial_core.c:613 do_output_char+0x5e8/0x870 drivers/tty/n_tty.c:442 process_output drivers/tty/n_tty.c:509 [inline] n_tty_write+0x487/0xf90 drivers/tty/n_tty.c:2395 do_tty_write drivers/tty/tty_io.c:1028 [inline] file_tty_write.constprop.0+0x4f8/0x8d0 drivers/tty/tty_io.c:1118 redirected_tty_write+0xa5/0xd0 drivers/tty/tty_io.c:1125 call_write_iter include/linux/fs.h:1904 [inline] do_iter_readv_writev+0x476/0x750 fs/read_write.c:740 do_iter_write+0x191/0x670 fs/read_write.c:866 vfs_writev+0x1ae/0x5e0 fs/read_write.c:939 do_writev+0x139/0x300 fs/read_write.c:982 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 -> #1 (&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+0x9f5/0xc60 drivers/tty/serial/8250/8250_port.c:3322 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:700 console_init+0x361/0x4fa kernel/printk/printk.c:2983 start_kernel+0x2e1/0x48e init/main.c:982 secondary_startup_64_no_verify+0xc2/0xcb -> #0 (console_owner){-.-.}-{0:0}: 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 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 force_sig_info_to_task+0x2a0/0x3b0 kernel/signal.c:1334 force_sig_fault_to_task kernel/signal.c:1673 [inline] force_sig_fault+0xb0/0xf0 kernel/signal.c:1680 __bad_area_nosemaphore+0x270/0x320 arch/x86/mm/fault.c:832 do_user_addr_fault+0x7f9/0xc00 arch/x86/mm/fault.c:1342 handle_page_fault arch/x86/mm/fault.c:1436 [inline] exc_page_fault+0xa2/0x1a0 arch/x86/mm/fault.c:1492 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 other info that might help us debug this: Chain exists of: console_owner --> &tty->read_wait --> &sighand->siglock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sighand->siglock); lock(&tty->read_wait); lock(&sighand->siglock); lock(console_owner); *** DEADLOCK *** 2 locks held by syz-executor.3/40424: #0: ffff888046e18958 (&sighand->siglock){-.-.}-{2:2}, at: force_sig_info_to_task+0x6c/0x3b0 kernel/signal.c:1317 #1: ffffffff84fec680 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 stack backtrace: CPU: 1 PID: 40424 Comm: syz-executor.3 Not tainted 5.10.156 #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 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 force_sig_info_to_task+0x2a0/0x3b0 kernel/signal.c:1334 force_sig_fault_to_task kernel/signal.c:1673 [inline] force_sig_fault+0xb0/0xf0 kernel/signal.c:1680 __bad_area_nosemaphore+0x270/0x320 arch/x86/mm/fault.c:832 do_user_addr_fault+0x7f9/0xc00 arch/x86/mm/fault.c:1342 handle_page_fault arch/x86/mm/fault.c:1436 [inline] exc_page_fault+0xa2/0x1a0 arch/x86/mm/fault.c:1492 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0033:0x7f0f3e4037b6 Code: 00 00 00 00 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 6a 0f 6f 20 66 0f 74 e0 66 0f d7 d4 85 d2 74 04 0f bc c2 c3 48 83 RSP: 002b:00007f0f3b988fa8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000000000000 RBP: 00007f0f3b989040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000240 R14: 00007f0f3b989000 R15: 0000000000000000 EXT4-fs warning (device sda): ext4_resize_begin:82: There are errors in the filesystem, so online resizing is not allowed EXT4-fs warning (device sda): ext4_resize_begin:82: There are errors in the filesystem, so online resizing is not allowed