R13: 00007fff15573def R14: 00007f7bc28d7300 R15: 0000000000022000 hpet: Lost 2 RTC interrupts kmemleak: Cannot allocate a scan area, scanning the full object ====================================================== WARNING: possible circular locking dependency detected 5.10.158 #1 Not tainted ------------------------------------------------------ syz-executor.2/41524 is trying to acquire lock: ffffffff84f0c2a0 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2e1/0xb40 kernel/printk/printk.c:2507 but task is already holding lock: ffff88800ead7b18 (&object->lock){..-.}-{2:2}, at: add_scan_area mm/kmemleak.c:806 [inline] ffff88800ead7b18 (&object->lock){..-.}-{2:2}, at: kmemleak_scan_area+0xb1/0x360 mm/kmemleak.c:1092 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&object->lock){..-.}-{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 __delete_object+0x87/0x100 mm/kmemleak.c:670 kmemleak_free_recursive include/linux/kmemleak.h:49 [inline] slab_free_hook mm/slub.c:1517 [inline] slab_free_freelist_hook+0x13e/0x180 mm/slub.c:1576 slab_free mm/slub.c:3149 [inline] kmem_cache_free+0xa7/0x310 mm/slub.c:3165 __sigqueue_free kernel/signal.c:611 [inline] collect_signal+0x2a4/0x520 kernel/signal.c:597 __dequeue_signal kernel/signal.c:619 [inline] dequeue_signal+0x326/0x620 kernel/signal.c:639 get_signal+0x6e9/0x2210 kernel/signal.c:2638 arch_do_signal+0x8c/0x1c60 arch/x86/kernel/signal.c:805 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0xf7/0x160 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x230 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x61/0xc6 -> #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:2070 [inline] __io_async_wake+0x40b/0x8d0 fs/io_uring.c:4950 __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:5063 __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 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 add_scan_area mm/kmemleak.c:808 [inline] kmemleak_scan_area+0x335/0x360 mm/kmemleak.c:1092 alloc_vmap_area+0x171/0x1d10 mm/vmalloc.c:1177 __get_vm_area_node+0x127/0x340 mm/vmalloc.c:2080 __vmalloc_node_range+0x13f/0x9e0 mm/vmalloc.c:2555 __vmalloc_node+0xb5/0x110 mm/vmalloc.c:2603 xt_copy_counters+0x2c2/0x5b0 net/netfilter/x_tables.c:1091 do_add_counters net/ipv4/netfilter/ip_tables.c:1165 [inline] do_ipt_set_ctl+0x17f/0xa90 net/ipv4/netfilter/ip_tables.c:1633 nf_setsockopt+0x8b/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xe20/0x3580 net/ipv4/ip_sockglue.c:1435 tcp_setsockopt+0x139/0x2690 net/ipv4/tcp.c:3452 __sys_setsockopt+0x180/0x2b0 net/socket.c:2121 __do_sys_setsockopt net/socket.c:2132 [inline] __se_sys_setsockopt net/socket.c:2129 [inline] __x64_sys_setsockopt+0xba/0x160 net/socket.c:2129 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 --> &sighand->siglock --> &object->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&object->lock); lock(&sighand->siglock); lock(&object->lock); lock(console_owner); *** DEADLOCK *** 2 locks held by syz-executor.2/41524: #0: ffff88800ead7b18 (&object->lock){..-.}-{2:2}, at: add_scan_area mm/kmemleak.c:806 [inline] #0: ffff88800ead7b18 (&object->lock){..-.}-{2:2}, at: kmemleak_scan_area+0xb1/0x360 mm/kmemleak.c:1092 #1: ffffffff84fec620 (console_lock){+.+.}-{0:0}, at: vprintk_func+0x8b/0x140 kernel/printk/printk_safe.c:401 stack backtrace: CPU: 0 PID: 41524 Comm: syz-executor.2 Not tainted 5.10.158 #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 add_scan_area mm/kmemleak.c:808 [inline] kmemleak_scan_area+0x335/0x360 mm/kmemleak.c:1092 alloc_vmap_area+0x171/0x1d10 mm/vmalloc.c:1177 __get_vm_area_node+0x127/0x340 mm/vmalloc.c:2080 __vmalloc_node_range+0x13f/0x9e0 mm/vmalloc.c:2555 __vmalloc_node+0xb5/0x110 mm/vmalloc.c:2603 xt_copy_counters+0x2c2/0x5b0 net/netfilter/x_tables.c:1091 do_add_counters net/ipv4/netfilter/ip_tables.c:1165 [inline] do_ipt_set_ctl+0x17f/0xa90 net/ipv4/netfilter/ip_tables.c:1633 nf_setsockopt+0x8b/0xf0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xe20/0x3580 net/ipv4/ip_sockglue.c:1435 tcp_setsockopt+0x139/0x2690 net/ipv4/tcp.c:3452 __sys_setsockopt+0x180/0x2b0 net/socket.c:2121 __do_sys_setsockopt net/socket.c:2132 [inline] __se_sys_setsockopt net/socket.c:2129 [inline] __x64_sys_setsockopt+0xba/0x160 net/socket.c:2129 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f7bc5361b19 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:00007f7bc28d7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f7bc5474f60 RCX: 00007f7bc5361b19 RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f7bc28d71d0 R08: 0000000000000068 R09: 0000000000000000 R10: 0000000020000a40 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff15573def R14: 00007f7bc28d7300 R15: 0000000000022000 hpet: Lost 5 RTC interrupts