===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.1.91-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.2/9401 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8ce0a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xf8/0x360 fs/fcntl.c:790 and this task is already holding: ffff888078632b30 (&f->f_owner.lock){....}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:776 which would create a new lock dependency: (&f->f_owner.lock){....}-{2:2} -> (tasklist_lock){.+.+}-{2:2} but this new dependency connects a SOFTIRQ-irq-safe lock: (&client->buffer_lock){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x3fc/0x650 drivers/input/input.c:385 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_event+0xa0/0xd0 drivers/input/input.c:431 hidinput_hid_event+0x13de/0x1d30 drivers/hid/hid-input.c:1706 hid_process_event+0x433/0x580 drivers/hid/hid-core.c:1544 hid_process_report drivers/hid/hid-core.c:1692 [inline] hid_report_raw_event+0xfd5/0x17e0 drivers/hid/hid-core.c:2019 hid_input_report+0x420/0x4e0 drivers/hid/hid-core.c:2087 hid_irq_in+0x45c/0x690 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x371/0x530 drivers/usb/core/hcd.c:1675 dummy_timer+0x8ad/0x3200 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 rcu_read_unlock include/linux/rcupdate.h:820 [inline] count_memcg_event_mm+0x330/0x410 include/linux/memcontrol.h:1099 handle_mm_fault+0x15b/0x5340 mm/memory.c:5254 do_user_addr_fault arch/x86/mm/fault.c:1371 [inline] handle_page_fault arch/x86/mm/fault.c:1462 [inline] exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x2c6/0xb80 kernel/exit.c:1602 kernel_wait+0xe5/0x230 kernel/exit.c:1792 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 other info that might help us debug this: Chain exists of: &client->buffer_lock --> &f->f_owner.lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&client->buffer_lock); lock(&f->f_owner.lock); lock(&client->buffer_lock); *** DEADLOCK *** 3 locks held by syz-executor.2/9401: #0: ffffffff91d61ac8 (&fsnotify_mark_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff91d61ac8 (&fsnotify_mark_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline] #0: ffffffff91d61ac8 (&fsnotify_mark_srcu){....}-{0:0}, at: fsnotify+0x409/0x2470 fs/notify/fsnotify.c:547 #1: ffff888013f0d038 (&mark->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #1: ffff888013f0d038 (&mark->lock){+.+.}-{2:2}, at: dnotify_handle_event+0x5d/0x440 fs/notify/dnotify/dnotify.c:107 #2: ffff888078632b30 (&f->f_owner.lock){....}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:776 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&client->buffer_lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x3fc/0x650 drivers/input/input.c:385 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_event+0xa0/0xd0 drivers/input/input.c:431 hidinput_hid_event+0x13de/0x1d30 drivers/hid/hid-input.c:1706 hid_process_event+0x433/0x580 drivers/hid/hid-core.c:1544 hid_process_report drivers/hid/hid-core.c:1692 [inline] hid_report_raw_event+0xfd5/0x17e0 drivers/hid/hid-core.c:2019 hid_input_report+0x420/0x4e0 drivers/hid/hid-core.c:2087 hid_irq_in+0x45c/0x690 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x371/0x530 drivers/usb/core/hcd.c:1675 dummy_timer+0x8ad/0x3200 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 rcu_read_unlock include/linux/rcupdate.h:820 [inline] count_memcg_event_mm+0x330/0x410 include/linux/memcontrol.h:1099 handle_mm_fault+0x15b/0x5340 mm/memory.c:5254 do_user_addr_fault arch/x86/mm/fault.c:1371 [inline] handle_page_fault arch/x86/mm/fault.c:1462 [inline] exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 INITIAL USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0xee/0xad0 drivers/input/evdev.c:261 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x3fc/0x650 drivers/input/input.c:385 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_event+0xa0/0xd0 drivers/input/input.c:431 hidinput_hid_event+0x13de/0x1d30 drivers/hid/hid-input.c:1706 hid_process_event+0x433/0x580 drivers/hid/hid-core.c:1544 hid_process_report drivers/hid/hid-core.c:1692 [inline] hid_report_raw_event+0xfd5/0x17e0 drivers/hid/hid-core.c:2019 hid_input_report+0x420/0x4e0 drivers/hid/hid-core.c:2087 hid_irq_in+0x45c/0x690 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x371/0x530 drivers/usb/core/hcd.c:1675 dummy_timer+0x8ad/0x3200 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1820 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 rcu_read_unlock include/linux/rcupdate.h:820 [inline] count_memcg_event_mm+0x330/0x410 include/linux/memcontrol.h:1099 handle_mm_fault+0x15b/0x5340 mm/memory.c:5254 do_user_addr_fault arch/x86/mm/fault.c:1371 [inline] handle_page_fault arch/x86/mm/fault.c:1462 [inline] exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1518 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 } ... key at: [] evdev_open.__key.25+0x0/0x20 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 fasync_remove_entry+0xfb/0x1d0 fs/fcntl.c:871 __tty_fasync drivers/tty/tty_io.c:2221 [inline] tty_fasync+0x113/0x350 drivers/tty/tty_io.c:2254 __fput+0x70d/0x890 fs/file_table.c:317 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:994 [inline] kill_fasync+0x196/0x4d0 fs/fcntl.c:1015 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x586/0xad0 drivers/input/evdev.c:278 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x366/0x650 drivers/input/input.c:374 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_inject_event+0x224/0x330 drivers/input/input.c:461 evdev_write+0x668/0x7c0 drivers/input/evdev.c:530 vfs_write+0x2d9/0xba0 fs/read_write.c:582 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] fasync_insert_entry.__key+0x0/0x20 ... acquired at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:994 [inline] kill_fasync+0x196/0x4d0 fs/fcntl.c:1015 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x586/0xad0 drivers/input/evdev.c:278 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x366/0x650 drivers/input/input.c:374 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_inject_event+0x224/0x330 drivers/input/input.c:461 evdev_write+0x668/0x7c0 drivers/input/evdev.c:530 vfs_write+0x2d9/0xba0 fs/read_write.c:582 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> (&f->f_owner.lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 f_modown+0x38/0x340 fs/fcntl.c:91 __tty_fasync drivers/tty/tty_io.c:2239 [inline] tty_fasync+0x260/0x350 drivers/tty/tty_io.c:2254 setfl fs/fcntl.c:73 [inline] do_fcntl+0xceb/0x1510 fs/fcntl.c:338 __do_sys_fcntl fs/fcntl.c:452 [inline] __se_sys_fcntl+0xd5/0x1b0 fs/fcntl.c:437 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x3b0 fs/fcntl.c:815 sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3363 queue_oob+0x626/0x8e0 net/unix/af_unix.c:2147 unix_stream_sendmsg+0xe10/0x1070 net/unix/af_unix.c:2247 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5a5/0x8f0 net/socket.c:2514 ___sys_sendmsg net/socket.c:2568 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2597 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x360 fs/fcntl.c:776 kill_fasync_rcu fs/fcntl.c:1001 [inline] kill_fasync+0x232/0x4d0 fs/fcntl.c:1015 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x586/0xad0 drivers/input/evdev.c:278 evdev_events+0x1be/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x8e0/0x12a0 drivers/input/input.c:159 input_event_dispose+0x366/0x650 drivers/input/input.c:374 input_handle_event+0x97d/0xb00 drivers/input/input.c:402 input_inject_event+0x224/0x330 drivers/input/input.c:461 evdev_write+0x668/0x7c0 drivers/input/evdev.c:530 vfs_write+0x2d9/0xba0 fs/read_write.c:582 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x2c6/0xb80 kernel/exit.c:1602 kernel_wait+0xe5/0x230 kernel/exit.c:1792 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 SOFTIRQ-ON-R at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x2c6/0xb80 kernel/exit.c:1602 kernel_wait+0xe5/0x230 kernel/exit.c:1792 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INITIAL USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:326 copy_process+0x24b6/0x4060 kernel/fork.c:2401 kernel_clone+0x222/0x920 kernel/fork.c:2682 user_mode_thread+0x12e/0x190 kernel/fork.c:2758 rest_init+0x23/0x300 init/main.c:699 start_kernel+0x0/0x53f init/main.c:894 start_kernel+0x496/0x53f init/main.c:1141 secondary_startup_64_no_verify+0xcf/0xdb INITIAL READ USE at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 do_wait+0x2c6/0xb80 kernel/exit.c:1602 kernel_wait+0xe5/0x230 kernel/exit.c:1792 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xf8/0x360 fs/fcntl.c:790 dnotify_handle_event+0x138/0x440 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event fs/notify/fsnotify.c:264 [inline] fsnotify_handle_event fs/notify/fsnotify.c:316 [inline] send_to_group fs/notify/fsnotify.c:364 [inline] fsnotify+0x1c13/0x2470 fs/notify/fsnotify.c:570 fsnotify_parent include/linux/fsnotify.h:80 [inline] fsnotify_file include/linux/fsnotify.h:99 [inline] fsnotify_access include/linux/fsnotify.h:309 [inline] do_iter_read+0xa19/0xc70 fs/read_write.c:801 vfs_readv fs/read_write.c:916 [inline] do_preadv+0x20e/0x350 fs/read_write.c:1008 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 stack backtrace: CPU: 1 PID: 9401 Comm: syz-executor.2 Not tainted 6.1.91-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2604 [inline] check_irq_usage kernel/locking/lockdep.c:2843 [inline] check_prev_add kernel/locking/lockdep.c:3094 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x4d16/0x5950 kernel/locking/lockdep.c:3825 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xf8/0x360 fs/fcntl.c:790 dnotify_handle_event+0x138/0x440 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event fs/notify/fsnotify.c:264 [inline] fsnotify_handle_event fs/notify/fsnotify.c:316 [inline] send_to_group fs/notify/fsnotify.c:364 [inline] fsnotify+0x1c13/0x2470 fs/notify/fsnotify.c:570 fsnotify_parent include/linux/fsnotify.h:80 [inline] fsnotify_file include/linux/fsnotify.h:99 [inline] fsnotify_access include/linux/fsnotify.h:309 [inline] do_iter_read+0xa19/0xc70 fs/read_write.c:801 vfs_readv fs/read_write.c:916 [inline] do_preadv+0x20e/0x350 fs/read_write.c:1008 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f69dca7cee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f69dd8980c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f69dcbabf80 RCX: 00007f69dca7cee9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f69dcac949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f69dcbabf80 R15: 00007fffb3934268