===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.6.101-syzkaller #0 Not tainted ----------------------------------------------------- syz.6.13001/12090 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff88801ee9cde0 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:990 [inline] ffff88801ee9cde0 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x192/0x4b0 fs/fcntl.c:1011 and this task is already holding: ffff88805ed09028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88805ed09028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 which would create a new lock dependency: (&client->buffer_lock){..-.}-{2:2} -> (&new->fa_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+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1d8/0x330 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:161 input_event_dispose+0x346/0x6c0 drivers/input/input.c:378 input_event+0x8c/0xc0 drivers/input/input.c:435 input_sync include/linux/input.h:450 [inline] hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1733 hid_report_raw_event+0x151d/0x1760 drivers/hid/hid-core.c:2033 hid_input_report+0x434/0x520 drivers/hid/hid-core.c:2100 hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650 dummy_timer+0x8a3/0x31b0 drivers/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 debug_lockdep_rcu_enabled+0x0/0x30 rcu_read_unlock include/linux/rcupdate.h:815 [inline] count_memcg_event_mm+0x2cf/0x3b0 include/linux/memcontrol.h:1104 mm_account_fault mm/memory.c:5200 [inline] handle_mm_fault+0x2857/0x4920 mm/memory.c:5347 do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228 do_wait+0x294/0xaf0 kernel/exit.c:1607 kernel_wait+0xac/0x170 kernel/exit.c:1797 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 other info that might help us debug this: Chain exists of: &client->buffer_lock --> &new->fa_lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&client->buffer_lock); lock(&new->fa_lock); lock(&client->buffer_lock); *** DEADLOCK *** 7 locks held by syz.6.13001/12090: #0: ffff888144fed110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_write+0x17b/0x470 drivers/input/evdev.c:513 #1: ffff888018f32230 (&dev->event_lock#2){-.-.}-{2:2}, at: input_inject_event+0xab/0x320 drivers/input/input.c:460 #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #2: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: input_inject_event+0xbc/0x320 drivers/input/input.c:462 #3: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #3: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #3: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: input_pass_values+0xa3/0x1300 drivers/input/input.c:153 #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #4: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: evdev_events+0x79/0x330 drivers/input/evdev.c:298 #5: ffff88805ed09028 (&client->buffer_lock){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #5: ffff88805ed09028 (&client->buffer_lock){..-.}-{2:2}, at: evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 #6: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #6: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #6: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x53/0x4b0 fs/fcntl.c:1010 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&client->buffer_lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1d8/0x330 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:161 input_event_dispose+0x346/0x6c0 drivers/input/input.c:378 input_event+0x8c/0xc0 drivers/input/input.c:435 input_sync include/linux/input.h:450 [inline] hidinput_report_event+0xa1/0xf0 drivers/hid/hid-input.c:1733 hid_report_raw_event+0x151d/0x1760 drivers/hid/hid-core.c:2033 hid_input_report+0x434/0x520 drivers/hid/hid-core.c:2100 hid_irq_in+0x479/0x6d0 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1650 dummy_timer+0x8a3/0x31b0 drivers/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1755 [inline] __hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1836 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 debug_lockdep_rcu_enabled+0x0/0x30 rcu_read_unlock include/linux/rcupdate.h:815 [inline] count_memcg_event_mm+0x2cf/0x3b0 include/linux/memcontrol.h:1104 mm_account_fault mm/memory.c:5200 [inline] handle_mm_fault+0x2857/0x4920 mm/memory.c:5347 do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324 handle_page_fault arch/x86/mm/fault.c:1465 [inline] exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 INITIAL USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162 evdev_set_mask drivers/input/evdev.c:980 [inline] evdev_do_ioctl drivers/input/evdev.c:1117 [inline] evdev_ioctl_handler+0x191d/0x1df0 drivers/input/evdev.c:1272 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] evdev_open.__key.28+0x0/0x20 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228 do_wait+0x294/0xaf0 kernel/exit.c:1607 kernel_wait+0xac/0x170 kernel/exit.c:1797 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 SOFTIRQ-ON-R at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228 do_wait+0x294/0xaf0 kernel/exit.c:1607 kernel_wait+0xac/0x170 kernel/exit.c:1797 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 INITIAL USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326 copy_process+0x225d/0x3d70 kernel/fork.c:2631 kernel_clone+0x21b/0x840 kernel/fork.c:2914 user_mode_thread+0xde/0x130 kernel/fork.c:2992 rest_init+0x27/0x300 init/main.c:697 arch_call_rest_init+0xe/0x10 init/main.c:829 start_kernel+0x459/0x4e0 init/main.c:1074 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:555 copy_bootdata+0x0/0xe0 arch/x86/kernel/head64.c:536 secondary_startup_64_no_verify+0x179/0x17b INITIAL READ USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228 do_wait+0x294/0xaf0 kernel/exit.c:1607 kernel_wait+0xac/0x170 kernel/exit.c:1797 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xb9/0x220 kernel/umh.c:164 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228 send_sigurg+0xf0/0x3c0 fs/fcntl.c:827 sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3387 queue_oob+0x3d7/0x4e0 net/unix/af_unix.c:2207 unix_stream_sendmsg+0xaa2/0xba0 net/unix/af_unix.c:2326 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595 ___sys_sendmsg+0x220/0x290 net/socket.c:2649 __sys_sendmmsg+0x275/0x4a0 net/socket.c:2735 __do_sys_sendmmsg net/socket.c:2764 [inline] __se_sys_sendmmsg net/socket.c:2761 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2761 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 send_sigurg+0x29/0x3c0 fs/fcntl.c:811 sk_send_sigurg+0x6f/0xc0 net/core/sock.c:3387 tcp_check_urg+0x200/0x750 net/ipv4/tcp_input.c:5770 tcp_urg+0x161/0x3f0 net/ipv4/tcp_input.c:5811 tcp_rcv_established+0xa2e/0x1cf0 net/ipv4/tcp_input.c:6166 tcp_v6_do_rcv+0x5e7/0x12d0 net/ipv6/tcp_ipv6.c:1480 tcp_v6_rcv+0x1fd4/0x26a0 net/ipv6/tcp_ipv6.c:1743 ip6_protocol_deliver_rcu+0xb7a/0x13c0 net/ipv6/ip6_input.c:438 ip6_input_finish+0x184/0x2c0 net/ipv6/ip6_input.c:483 NF_HOOK+0x303/0x390 include/linux/netfilter.h:304 NF_HOOK+0x303/0x390 include/linux/netfilter.h:304 __netif_receive_skb_one_core net/core/dev.c:5596 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5710 process_backlog+0x380/0x6e0 net/core/dev.c:6038 __napi_poll+0xc0/0x460 net/core/dev.c:6600 napi_poll net/core/dev.c:6667 [inline] net_rx_action+0x5ea/0xbf0 net/core/dev.c:6803 handle_softirqs+0x280/0x820 kernel/softirq.c:578 run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950 smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 INITIAL USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326 __f_setown+0x3b/0x330 fs/fcntl.c:92 generic_add_lease fs/locks.c:1815 [inline] generic_setlease+0xe32/0x1270 fs/locks.c:1895 vfs_setlease fs/locks.c:1960 [inline] do_fcntl_add_lease fs/locks.c:1981 [inline] fcntl_setlease+0x268/0x340 fs/locks.c:2003 do_fcntl+0x1cb/0x1380 fs/fcntl.c:397 __do_sys_fcntl fs/fcntl.c:448 [inline] __se_sys_fcntl+0xc9/0x1a0 fs/fcntl.c:433 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 send_sigio+0x33/0x360 fs/fcntl.c:772 dnotify_handle_event+0x153/0x420 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_event fs/notify/fsnotify.c:330 [inline] send_to_group fs/notify/fsnotify.c:378 [inline] fsnotify+0x1466/0x1780 fs/notify/fsnotify.c:584 fsnotify_parent include/linux/fsnotify.h:80 [inline] fsnotify_dentry include/linux/fsnotify.h:89 [inline] fsnotify_change+0x220/0x270 include/linux/fsnotify.h:387 fat_ioctl_set_attributes fs/fat/file.c:103 [inline] fat_generic_ioctl+0xadb/0xdb0 fs/fat/file.c:165 fat_dir_ioctl+0x147/0x2f0 fs/fat/dir.c:804 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] init_file.__key+0x0/0x20 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 send_sigio+0x33/0x360 fs/fcntl.c:772 kill_fasync_rcu fs/fcntl.c:997 [inline] kill_fasync+0x228/0x4b0 fs/fcntl.c:1011 wakeup_pipe_readers fs/splice.c:183 [inline] splice_file_to_pipe+0x100/0x110 fs/splice.c:1236 do_splice+0x116a/0x1bf0 fs/splice.c:1313 __do_splice fs/splice.c:1370 [inline] __do_sys_splice fs/splice.c:1586 [inline] __se_sys_splice+0x37a/0x470 fs/splice.c:1568 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xa3/0xe0 kernel/locking/spinlock.c:326 fasync_remove_entry+0xf4/0x1c0 fs/fcntl.c:867 lease_modify+0x1a6/0x390 fs/locks.c:1402 locks_remove_lease fs/locks.c:2609 [inline] locks_remove_file+0x4c0/0xe20 fs/locks.c:2634 __fput+0x18f/0x970 fs/file_table.c:376 task_work_run+0x1ce/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 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:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:990 [inline] kill_fasync+0x192/0x4b0 fs/fcntl.c:1011 wakeup_pipe_readers fs/splice.c:183 [inline] splice_file_to_pipe+0x100/0x110 fs/splice.c:1236 do_splice+0x116a/0x1bf0 fs/splice.c:1313 __do_splice fs/splice.c:1370 [inline] __do_sys_splice fs/splice.c:1586 [inline] __se_sys_splice+0x37a/0x470 fs/splice.c:1568 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] fasync_insert_entry.__key+0x0/0x20 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:990 [inline] kill_fasync+0x192/0x4b0 fs/fcntl.c:1011 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1d8/0x330 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:161 input_event_dispose+0x346/0x6c0 drivers/input/input.c:378 input_inject_event+0x1f9/0x320 drivers/input/input.c:465 evdev_write+0x32a/0x470 drivers/input/evdev.c:530 vfs_write+0x288/0x940 fs/read_write.c:582 ksys_write+0x147/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 stack backtrace: CPU: 0 PID: 12090 Comm: syz.6.13001 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline] check_irq_usage kernel/locking/lockdep.c:2865 [inline] check_prev_add kernel/locking/lockdep.c:3138 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x678f/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:990 [inline] kill_fasync+0x192/0x4b0 fs/fcntl.c:1011 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1d8/0x330 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:129 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:161 input_event_dispose+0x346/0x6c0 drivers/input/input.c:378 input_inject_event+0x1f9/0x320 drivers/input/input.c:465 evdev_write+0x32a/0x470 drivers/input/evdev.c:530 vfs_write+0x288/0x940 fs/read_write.c:582 ksys_write+0x147/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fcafcd8ebe9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcafdb56038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fcafcfb5fa0 RCX: 00007fcafcd8ebe9 RDX: 0000000000001068 RSI: 0000200000000040 RDI: 0000000000000005 RBP: 00007fcafce11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcafcfb6038 R14: 00007fcafcfb5fa0 R15: 00007ffebe300898