RBP: 00007f86b11c41d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcbdfec04f R14: 00007f86b11c4300 R15: 0000000000022000 ====================================================== WARNING: possible circular locking dependency detected 5.10.156 #1 Not tainted ------------------------------------------------------ syz-executor.2/20892 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: ffff88801ebe9bd8 (&sighand->siglock){..-.}-{2:2}, at: __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391 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_set_ldisc+0x92/0x680 drivers/tty/tty_ldisc.c:562 tiocsetd drivers/tty/tty_io.c:2420 [inline] tty_ioctl+0x6cc/0x1840 drivers/tty/tty_io.c:2679 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_set_ldisc+0x92/0x680 drivers/tty/tty_ldisc.c:562 tiocsetd drivers/tty/tty_io.c:2420 [inline] tty_ioctl+0x6cc/0x1840 drivers/tty/tty_io.c:2679 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 serial8250_handle_irq.part.0+0x43e/0x530 drivers/tty/serial/8250/8250_port.c:1921 serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1894 [inline] serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1937 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 -> #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 do_send_sig_info kernel/signal.c:1291 [inline] do_send_specific+0x1f7/0x340 kernel/signal.c:3789 do_tkill+0x17c/0x1f0 kernel/signal.c:3815 __do_sys_tkill kernel/signal.c:3850 [inline] __se_sys_tkill kernel/signal.c:3844 [inline] __x64_sys_tkill+0x67/0xa0 kernel/signal.c:3844 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: 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 *** 3 locks held by syz-executor.2/20892: #0: ffffffff84ff81a0 (rcu_read_lock){....}-{1:2}, at: do_send_specific+0x0/0x340 kernel/signal.c:3648 #1: ffff88801ebe9bd8 (&sighand->siglock){..-.}-{2:2}, at: __lock_task_sighand+0xd3/0x2f0 kernel/signal.c:1391 #2: ffffffff84fec680 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 stack backtrace: CPU: 1 PID: 20892 Comm: syz-executor.2 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 do_send_sig_info kernel/signal.c:1291 [inline] do_send_specific+0x1f7/0x340 kernel/signal.c:3789 do_tkill+0x17c/0x1f0 kernel/signal.c:3815 __do_sys_tkill kernel/signal.c:3850 [inline] __se_sys_tkill kernel/signal.c:3844 [inline] __x64_sys_tkill+0x67/0xa0 kernel/signal.c:3844 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f86b3c4eb19 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:00007f86b11c4188 EFLAGS: 00000246 ORIG_RAX: 00000000000000c8 RAX: ffffffffffffffda RBX: 00007f86b3d61f60 RCX: 00007f86b3c4eb19 RDX: 0000000000000000 RSI: 0000000000000013 RDI: 00000000000002ba RBP: 00007f86b11c41d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcbdfec04f R14: 00007f86b11c4300 R15: 0000000000022000 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 20917 Comm: syz-executor.1 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 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 _copy_from_user+0x2e/0x1b0 lib/usercopy.c:14 copy_from_user include/linux/uaccess.h:192 [inline] move_addr_to_kernel.part.0+0x31/0x110 net/socket.c:198 move_addr_to_kernel net/socket.c:196 [inline] __copy_msghdr_from_user+0x3e1/0x4b0 net/socket.c:2247 copy_msghdr_from_user net/socket.c:2275 [inline] sendmsg_copy_msghdr+0xa1/0x160 net/socket.c:2373 ___sys_sendmsg+0xc6/0x170 net/socket.c:2392 __sys_sendmmsg+0x195/0x470 net/socket.c:2486 __do_sys_sendmmsg net/socket.c:2515 [inline] __se_sys_sendmmsg net/socket.c:2512 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2512 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fc0ca229b19 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:00007fc0c779f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fc0ca33cf60 RCX: 00007fc0ca229b19 RDX: 0000000000000001 RSI: 0000000020000800 RDI: 0000000000000004 RBP: 00007fc0c779f1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffede55efff R14: 00007fc0c779f300 R15: 0000000000022000 CPU: 0 PID: 20918 Comm: syz-executor.4 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 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 _copy_from_user+0x2e/0x1b0 lib/usercopy.c:14 copy_from_user include/linux/uaccess.h:192 [inline] __copy_msghdr_from_user+0x91/0x4b0 net/socket.c:2224 copy_msghdr_from_user net/socket.c:2275 [inline] sendmsg_copy_msghdr+0xa1/0x160 net/socket.c:2373 ___sys_sendmsg+0xc6/0x170 net/socket.c:2392 __sys_sendmmsg+0x195/0x470 net/socket.c:2486 __do_sys_sendmmsg net/socket.c:2515 [inline] __se_sys_sendmmsg net/socket.c:2512 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2512 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fb08e1e8b19 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:00007fb08b75e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fb08e2fbf60 RCX: 00007fb08e1e8b19 RDX: 0000000000000001 RSI: 0000000020000800 RDI: 0000000000000004 RBP: 00007fb08b75e1d0 R08: 0000000000000000 R09: 0000000000000000 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd99dba8ff R14: 00007fb08b75e300 R15: 0000000000022000 CPU: 1 PID: 20922 Comm: syz-executor.0 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 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 _copy_from_user+0x2e/0x1b0 lib/usercopy.c:14 copy_from_user include/linux/uaccess.h:192 [inline] __copy_msghdr_from_user+0x91/0x4b0 net/socket.c:2224 copy_msghdr_from_user net/socket.c:2275 [inline] sendmsg_copy_msghdr+0xa1/0x160 net/socket.c:2373 ___sys_sendmsg+0xc6/0x170 net/socket.c:2392 __sys_sendmmsg+0x195/0x470 net/socket.c:2486 __do_sys_sendmmsg net/socket.c:2515 [inline] __se_sys_sendmmsg net/socket.c:2512 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2512 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f5a5d378b19 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:00007f5a5a8ee188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f5a5d48bf60 RCX: 00007f5a5d378b19 RDX: 0000000000000001 RSI: 0000000020000800 RDI: 0000000000000004 RBP: 00007f5a5a8ee1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcfaee6f3f R14: 00007f5a5a8ee300 R15: 0000000000022000