===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected syzkaller #0 Not tainted ----------------------------------------------------- syz.1.318/5274 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff888025983038 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x330 fs/fcntl.c:790 and this task is already holding: ffff888059313018 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1008 [inline] ffff888059313018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x16d/0x490 fs/fcntl.c:1029 which would create a new lock dependency: (&new->fa_lock){....}-{2:2} -> (&f->f_owner.lock){...-}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (&dev->event_lock#2){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 input_event+0x76/0xb0 drivers/input/input.c:456 input_report_key include/linux/input.h:425 [inline] psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:123 [inline] psmouse_report_standard_packet+0x4f/0x200 drivers/input/mouse/psmouse-base.c:141 psmouse_process_byte+0x42b/0x620 drivers/input/mouse/psmouse-base.c:232 psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:274 psmouse_interrupt+0x699/0x1130 drivers/input/mouse/psmouse-base.c:426 serio_interrupt+0x87/0x130 drivers/input/serio/serio.c:1001 i8042_interrupt+0x363/0x710 drivers/input/serio/i8042.c:606 __handle_irq_event_percpu+0x299/0x9d0 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0xa5/0x220 kernel/irq/handle.c:213 handle_edge_irq+0x243/0xb20 kernel/irq/chip.c:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:233 [inline] __common_interrupt+0xd7/0x1e0 arch/x86/kernel/irq.c:252 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:242 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667 lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627 local_lock_acquire+0x34/0x170 include/linux/local_lock_internal.h:29 __radix_tree_preload+0x7e/0x450 lib/radix-tree.c:332 idr_preload+0x15/0xb0 lib/radix-tree.c:1469 __kernfs_new_node+0xfe/0x6c0 fs/kernfs/dir.c:597 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:669 kernfs_create_dir_ns+0x40/0x120 fs/kernfs/dir.c:1005 sysfs_create_dir_ns+0x12c/0x290 fs/sysfs/dir.c:59 create_dir lib/kobject.c:89 [inline] kobject_add_internal+0x6e0/0xd90 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_init_and_add+0x128/0x190 lib/kobject.c:481 bus_add_driver+0x1dc/0x5a0 drivers/base/bus.c:613 driver_register+0x32d/0x430 drivers/base/driver.c:240 usb_register_driver+0x202/0x3d0 drivers/usb/core/driver.c:1061 do_one_initcall+0x272/0x730 init/main.c:1316 do_initcall_level+0x137/0x1f0 init/main.c:1389 do_initcalls+0x4b/0x90 init/main.c:1405 kernel_init_freeable+0x3e9/0x570 init/main.c:1629 kernel_init+0x19/0x1b0 init/main.c:1520 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 to a HARDIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x293/0xac0 kernel/exit.c:1579 kernel_wait+0xd3/0x1c0 kernel/exit.c:1769 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 other info that might help us debug this: Chain exists of: &dev->event_lock#2 --> &new->fa_lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock#2); lock(&new->fa_lock); lock(&dev->event_lock#2); *** DEADLOCK *** 7 locks held by syz.1.318/5274: #0: ffff88802587d110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x17c/0x490 drivers/input/evdev.c:513 #1: ffff888025958230 (&dev->event_lock#2){-.-.}-{2:2}, at: input_inject_event+0x9e/0x2c0 drivers/input/input.c:482 #2: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #3: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #4: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #5: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #6: ffff888059313018 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1008 [inline] #6: ffff888059313018 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x16d/0x490 fs/fcntl.c:1029 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&dev->event_lock#2){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 input_event+0x76/0xb0 drivers/input/input.c:456 input_report_key include/linux/input.h:425 [inline] psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:123 [inline] psmouse_report_standard_packet+0x4f/0x200 drivers/input/mouse/psmouse-base.c:141 psmouse_process_byte+0x42b/0x620 drivers/input/mouse/psmouse-base.c:232 psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:274 psmouse_interrupt+0x699/0x1130 drivers/input/mouse/psmouse-base.c:426 serio_interrupt+0x87/0x130 drivers/input/serio/serio.c:1001 i8042_interrupt+0x363/0x710 drivers/input/serio/i8042.c:606 __handle_irq_event_percpu+0x299/0x9d0 kernel/irq/handle.c:156 handle_irq_event_percpu kernel/irq/handle.c:196 [inline] handle_irq_event+0xa5/0x220 kernel/irq/handle.c:213 handle_edge_irq+0x243/0xb20 kernel/irq/chip.c:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:233 [inline] __common_interrupt+0xd7/0x1e0 arch/x86/kernel/irq.c:252 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:242 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:667 lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627 local_lock_acquire+0x34/0x170 include/linux/local_lock_internal.h:29 __radix_tree_preload+0x7e/0x450 lib/radix-tree.c:332 idr_preload+0x15/0xb0 lib/radix-tree.c:1469 __kernfs_new_node+0xfe/0x6c0 fs/kernfs/dir.c:597 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:669 kernfs_create_dir_ns+0x40/0x120 fs/kernfs/dir.c:1005 sysfs_create_dir_ns+0x12c/0x290 fs/sysfs/dir.c:59 create_dir lib/kobject.c:89 [inline] kobject_add_internal+0x6e0/0xd90 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_init_and_add+0x128/0x190 lib/kobject.c:481 bus_add_driver+0x1dc/0x5a0 drivers/base/bus.c:613 driver_register+0x32d/0x430 drivers/base/driver.c:240 usb_register_driver+0x202/0x3d0 drivers/usb/core/driver.c:1061 do_one_initcall+0x272/0x730 init/main.c:1316 do_initcall_level+0x137/0x1f0 init/main.c:1389 do_initcalls+0x4b/0x90 init/main.c:1405 kernel_init_freeable+0x3e9/0x570 init/main.c:1629 kernel_init+0x19/0x1b0 init/main.c:1520 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 IN-SOFTIRQ-W at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 input_event+0x76/0xb0 drivers/input/input.c:456 input_sync include/linux/input.h:450 [inline] hidinput_report_event+0x9d/0xf0 drivers/hid/hid-input.c:1500 hid_report_raw_event+0x142d/0x1640 drivers/hid/hid-core.c:1829 hid_input_report+0x424/0x4e0 drivers/hid/hid-core.c:1889 hid_irq_in+0x435/0x690 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1674 dummy_timer+0x880/0x30b0 drivers/usb/gadget/udc/dummy_hcd.c:1998 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648 expire_timers kernel/time/timer.c:1699 [inline] __run_timers+0x53e/0x800 kernel/time/timer.c:1970 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983 handle_softirqs+0x339/0x830 kernel/softirq.c:576 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 console_unlock+0xcad/0x1120 kernel/printk/printk.c:2749 vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274 dev_vprintk_emit+0x2e1/0x380 drivers/base/core.c:4638 dev_printk_emit+0xeb/0x140 drivers/base/core.c:4649 _dev_notice+0x11b/0x170 drivers/base/core.c:4706 usb_parse_endpoint drivers/usb/core/config.c:399 [inline] usb_parse_interface drivers/usb/core/config.c:600 [inline] usb_parse_configuration drivers/usb/core/config.c:813 [inline] usb_get_configuration+0x27c0/0x4d30 drivers/usb/core/config.c:962 usb_enumerate_device drivers/usb/core/hub.c:2464 [inline] usb_new_device+0x138/0x1660 drivers/usb/core/hub.c:2602 hub_port_connect drivers/usb/core/hub.c:5497 [inline] hub_port_connect_change drivers/usb/core/hub.c:5637 [inline] port_event drivers/usb/core/hub.c:5799 [inline] hub_event+0x2e4a/0x55e0 drivers/usb/core/hub.c:5881 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 input_inject_event+0x9e/0x2c0 drivers/input/input.c:482 led_trigger_event+0x10a/0x1e0 drivers/leds/led-triggers.c:392 kbd_led_trigger_activate+0xb9/0x100 drivers/tty/vt/keyboard.c:1029 led_trigger_set+0x50c/0x910 drivers/leds/led-triggers.c:211 led_trigger_set_default+0x19c/0x1e0 drivers/leds/led-triggers.c:275 led_classdev_register_ext+0x6df/0x8c0 drivers/leds/led-class.c:428 led_classdev_register include/linux/leds.h:196 [inline] input_leds_connect+0x51d/0x750 drivers/input/input-leds.c:139 input_attach_handler drivers/input/input.c:1046 [inline] input_register_device+0xda7/0x1140 drivers/input/input.c:2429 atkbd_connect+0x766/0xa20 drivers/input/keyboard/atkbd.c:1337 serio_connect_driver drivers/input/serio/serio.c:47 [inline] serio_driver_probe+0x76/0x90 drivers/input/serio/serio.c:778 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x284/0xc80 drivers/base/dd.c:595 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:755 driver_probe_device+0x4f/0x420 drivers/base/dd.c:785 __driver_attach+0x46b/0x670 drivers/base/dd.c:1164 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 serio_attach_driver drivers/input/serio/serio.c:807 [inline] serio_handle_event+0x29c/0x840 drivers/input/serio/serio.c:227 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 } ... key at: [] input_allocate_device.__key.6+0x0/0x20 -> (&new->fa_lock){....}-{2:2} { INITIAL READ USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1008 [inline] kill_fasync+0x16d/0x490 fs/fcntl.c:1029 mousedev_notify_readers+0x6bf/0xb80 drivers/input/mousedev.c:309 mousedev_event+0x568/0x11f0 drivers/input/mousedev.c:394 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x941/0x1210 drivers/input/input.c:156 input_handle_event+0xb3f/0x1490 drivers/input/input.c:415 input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487 evdev_write+0x35b/0x490 drivers/input/evdev.c:530 vfs_write+0x30b/0xd60 fs/read_write.c:592 ksys_write+0x152/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 } ... key at: [] fasync_insert_entry.__key+0x0/0x20 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1008 [inline] kill_fasync+0x16d/0x490 fs/fcntl.c:1029 mousedev_notify_readers+0x6bf/0xb80 drivers/input/mousedev.c:309 mousedev_event+0x568/0x11f0 drivers/input/mousedev.c:394 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x941/0x1210 drivers/input/input.c:156 input_handle_event+0xb3f/0x1490 drivers/input/input.c:415 input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487 evdev_write+0x35b/0x490 drivers/input/evdev.c:530 vfs_write+0x30b/0xd60 fs/read_write.c:592 ksys_write+0x152/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x293/0xac0 kernel/exit.c:1579 kernel_wait+0xd3/0x1c0 kernel/exit.c:1769 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 SOFTIRQ-ON-R at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x293/0xac0 kernel/exit.c:1579 kernel_wait+0xd3/0x1c0 kernel/exit.c:1769 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316 copy_process+0x236f/0x3e20 kernel/fork.c:2412 kernel_clone+0x23f/0x990 kernel/fork.c:2679 kernel_thread+0xfa/0x160 kernel/fork.c:2731 rest_init+0x21/0x330 init/main.c:720 start_kernel+0x489/0x540 init/main.c:1154 secondary_startup_64_no_verify+0xb1/0xbb INITIAL READ USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x293/0xac0 kernel/exit.c:1579 kernel_wait+0xd3/0x1c0 kernel/exit.c:1769 call_usermodehelper_exec_sync kernel/umh.c:139 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xd2/0x330 fs/fcntl.c:804 dnotify_handle_event+0x14f/0x420 fs/notify/dnotify/dnotify.c:97 fsnotify_handle_inode_event fs/notify/fsnotify.c:282 [inline] fsnotify_handle_event fs/notify/fsnotify.c:337 [inline] send_to_group fs/notify/fsnotify.c:385 [inline] fsnotify+0x1912/0x1ce0 fs/notify/fsnotify.c:591 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_move+0x1bf/0x4e0 include/linux/fsnotify.h:166 vfs_rename+0xd5e/0x1100 fs/namei.c:4866 do_renameat2+0x8b7/0xf60 fs/namei.c:4993 __do_sys_renameat2 fs/namei.c:5026 [inline] __se_sys_renameat2 fs/namei.c:5023 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5023 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x390 fs/fcntl.c:829 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137 tcp_check_urg net/ipv4/tcp_input.c:5688 [inline] tcp_urg+0x2bc/0xb20 net/ipv4/tcp_input.c:5729 tcp_rcv_established+0xac2/0x1ce0 net/ipv4/tcp_input.c:6063 tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731 tcp_v4_rcv+0x26d8/0x2d10 net/ipv4/tcp_ipv4.c:2143 ip_protocol_deliver_rcu+0x3ad/0x770 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1d5/0x320 net/ipv4/ip_input.c:231 NF_HOOK+0x303/0x390 include/linux/netfilter.h:302 NF_HOOK+0x303/0x390 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5551 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5665 process_backlog+0x370/0x790 net/core/dev.c:6542 __napi_poll+0xc0/0x430 net/core/dev.c:7101 napi_poll net/core/dev.c:7168 [inline] net_rx_action+0x4d4/0xa10 net/core/dev.c:7258 handle_softirqs+0x339/0x830 kernel/softirq.c:576 do_softirq+0x142/0x210 kernel/softirq.c:477 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:401 sk_stream_wait_memory+0x6e5/0xe60 net/core/stream.c:145 tcp_sendmsg_locked+0x1d02/0x3320 net/ipv4/tcp.c:1422 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2072 __do_sys_sendto net/socket.c:2084 [inline] __se_sys_sendto net/socket.c:2080 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2080 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316 __f_setown+0x37/0x330 fs/fcntl.c:91 fcntl_dirnotify+0x6a7/0x8b0 fs/notify/dnotify/dnotify.c:351 do_fcntl+0x5be/0x1360 fs/fcntl.c:416 __do_sys_fcntl fs/fcntl.c:466 [inline] __se_sys_fcntl+0xcc/0x190 fs/fcntl.c:451 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 INITIAL READ USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x390 fs/fcntl.c:829 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137 tcp_check_urg net/ipv4/tcp_input.c:5688 [inline] tcp_urg+0x2bc/0xb20 net/ipv4/tcp_input.c:5729 tcp_rcv_established+0xac2/0x1ce0 net/ipv4/tcp_input.c:6063 tcp_v4_do_rcv+0x44b/0x9b0 net/ipv4/tcp_ipv4.c:1731 sk_backlog_rcv include/net/sock.h:1080 [inline] __release_sock+0x1e1/0x450 net/core/sock.c:2731 release_sock+0x5b/0x1b0 net/core/sock.c:3274 sk_stream_wait_memory+0x6e5/0xe60 net/core/stream.c:145 tcp_sendmsg_locked+0x1d02/0x3320 net/ipv4/tcp.c:1422 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2072 __do_sys_sendto net/socket.c:2084 [inline] __se_sys_sendto net/socket.c:2080 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2080 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x330 fs/fcntl.c:790 kill_fasync_rcu fs/fcntl.c:1015 [inline] kill_fasync+0x20a/0x490 fs/fcntl.c:1029 mousedev_notify_readers+0x6bf/0xb80 drivers/input/mousedev.c:309 mousedev_event+0x568/0x11f0 drivers/input/mousedev.c:394 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x941/0x1210 drivers/input/input.c:156 input_handle_event+0xb3f/0x1490 drivers/input/input.c:415 input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487 evdev_write+0x35b/0x490 drivers/input/evdev.c:530 vfs_write+0x30b/0xd60 fs/read_write.c:592 ksys_write+0x152/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 stack backtrace: CPU: 0 PID: 5274 Comm: syz.1.318 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2567 [inline] check_irq_usage kernel/locking/lockdep.c:2806 [inline] check_prev_add kernel/locking/lockdep.c:3057 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x6688/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x330 fs/fcntl.c:790 kill_fasync_rcu fs/fcntl.c:1015 [inline] kill_fasync+0x20a/0x490 fs/fcntl.c:1029 mousedev_notify_readers+0x6bf/0xb80 drivers/input/mousedev.c:309 mousedev_event+0x568/0x11f0 drivers/input/mousedev.c:394 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x941/0x1210 drivers/input/input.c:156 input_handle_event+0xb3f/0x1490 drivers/input/input.c:415 input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487 evdev_write+0x35b/0x490 drivers/input/evdev.c:530 vfs_write+0x30b/0xd60 fs/read_write.c:592 ksys_write+0x152/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0b39573819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0b377cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0b397ecfa0 RCX: 00007f0b39573819 RDX: 0000000000000918 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f0b39609c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0b397ed038 R14: 00007f0b397ecfa0 R15: 00007ffd375a2618