===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0 Not tainted ----------------------------------------------------- syz-executor.0/12213 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8d80a098 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xb4/0x3c0 fs/fcntl.c:830 and this task is already holding: ffff88802212c898 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x28/0x3c0 fs/fcntl.c:816 which would create a new lock dependency: (&f->f_owner.lock){...-}-{2:2} -> (tasklist_lock){.+.+}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (&client->buffer_lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __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+0x10e/0x9b0 drivers/input/evdev.c:261 evdev_events+0x1b7/0x390 drivers/input/evdev.c:306 input_to_handler+0x2a1/0x4d0 drivers/input/input.c:129 input_pass_values+0x5c9/0x840 drivers/input/input.c:161 input_event_dispose+0x508/0x630 drivers/input/input.c:389 input_handle_event+0x11c/0xd80 drivers/input/input.c:406 input_event drivers/input/input.c:435 [inline] input_event+0x83/0xa0 drivers/input/input.c:427 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1746 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540 hid_process_report drivers/hid/hid-core.c:1688 [inline] hid_report_raw_event+0x96b/0x11c0 drivers/hid/hid-core.c:2015 hid_input_report+0x345/0x440 drivers/hid/hid-core.c:2089 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x364/0x5c0 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1732 dummy_timer+0x17f6/0x3900 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1687 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1751 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x328/0x600 lib/debugobjects.c:1019 slab_free_hook mm/slub.c:2163 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x284/0x3b0 mm/slub.c:4558 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 to a HARDIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1583 do_wait+0x219/0x570 kernel/exit.c:1627 kernel_wait+0xa0/0x160 kernel/exit.c:1803 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 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 *** 4 locks held by syz-executor.0/12213: #0: ffff88802d3ab868 (&pipe->mutex){+.+.}-{3:3}, at: pipe_release+0x4a/0x320 fs/pipe.c:727 #1: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #1: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #1: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: kill_fasync fs/fcntl.c:1048 [inline] #1: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x6d/0x4f0 fs/fcntl.c:1042 #2: ffff88802c91b168 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1028 [inline] #2: ffff88802c91b168 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1049 [inline] #2: ffff88802c91b168 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x138/0x4f0 fs/fcntl.c:1042 #3: ffff88802212c898 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x28/0x3c0 fs/fcntl.c:816 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&client->buffer_lock){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __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+0x10e/0x9b0 drivers/input/evdev.c:261 evdev_events+0x1b7/0x390 drivers/input/evdev.c:306 input_to_handler+0x2a1/0x4d0 drivers/input/input.c:129 input_pass_values+0x5c9/0x840 drivers/input/input.c:161 input_event_dispose+0x508/0x630 drivers/input/input.c:389 input_handle_event+0x11c/0xd80 drivers/input/input.c:406 input_event drivers/input/input.c:435 [inline] input_event+0x83/0xa0 drivers/input/input.c:427 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1746 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540 hid_process_report drivers/hid/hid-core.c:1688 [inline] hid_report_raw_event+0x96b/0x11c0 drivers/hid/hid-core.c:2015 hid_input_report+0x345/0x440 drivers/hid/hid-core.c:2089 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x364/0x5c0 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1732 dummy_timer+0x17f6/0x3900 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1687 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1751 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x328/0x600 lib/debugobjects.c:1019 slab_free_hook mm/slub.c:2163 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x284/0x3b0 mm/slub.c:4558 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __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+0x10e/0x9b0 drivers/input/evdev.c:261 evdev_events+0x1b7/0x390 drivers/input/evdev.c:306 input_to_handler+0x2a1/0x4d0 drivers/input/input.c:129 input_pass_values+0x5c9/0x840 drivers/input/input.c:161 input_event_dispose+0x508/0x630 drivers/input/input.c:389 input_handle_event+0x11c/0xd80 drivers/input/input.c:406 input_event drivers/input/input.c:435 [inline] input_event+0x83/0xa0 drivers/input/input.c:427 hidinput_hid_event+0xa12/0x2410 drivers/hid/hid-input.c:1746 hid_process_event+0x4b7/0x5e0 drivers/hid/hid-core.c:1540 hid_process_report drivers/hid/hid-core.c:1688 [inline] hid_report_raw_event+0x96b/0x11c0 drivers/hid/hid-core.c:2015 hid_input_report+0x345/0x440 drivers/hid/hid-core.c:2089 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x364/0x5c0 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1732 dummy_timer+0x17f6/0x3900 drivers/usb/gadget/udc/dummy_hcd.c:1987 __run_hrtimer kernel/time/hrtimer.c:1687 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1751 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 expire_timers kernel/time/timer.c:1842 [inline] __run_timers+0x73b/0xaf0 kernel/time/timer.c:2417 __run_timer_base kernel/time/timer.c:2428 [inline] __run_timer_base kernel/time/timer.c:2421 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2437 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2447 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 __debug_check_no_obj_freed lib/debugobjects.c:998 [inline] debug_check_no_obj_freed+0x328/0x600 lib/debugobjects.c:1019 slab_free_hook mm/slub.c:2163 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x284/0x3b0 mm/slub.c:4558 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:376 [inline] evdev_fetch_next_event drivers/input/evdev.c:545 [inline] evdev_read+0x43f/0xdf0 drivers/input/evdev.c:586 do_loop_readv_writev fs/read_write.c:761 [inline] do_loop_readv_writev fs/read_write.c:749 [inline] vfs_readv+0x6cb/0x8a0 fs/read_write.c:934 do_readv+0x287/0x370 fs/read_write.c:994 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.1+0x0/0x40 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 fasync_remove_entry+0xb9/0x1f0 fs/fcntl.c:905 fasync_helper+0xaf/0xd0 fs/fcntl.c:1008 sock_fasync+0x98/0x140 net/socket.c:1446 __fput+0x94a/0xbb0 fs/file_table.c:419 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1028 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x138/0x4f0 fs/fcntl.c:1042 wakeup_pipe_readers fs/splice.c:183 [inline] splice_pipe_to_pipe fs/splice.c:1865 [inline] do_splice+0xb55/0x1f90 fs/splice.c:1331 __do_splice+0x159/0x360 fs/splice.c:1436 __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice fs/splice.c:1634 [inline] __x64_sys_splice+0x1d2/0x260 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.0+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1028 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x138/0x4f0 fs/fcntl.c:1042 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x619/0x9b0 drivers/input/evdev.c:278 evdev_events+0x1b7/0x390 drivers/input/evdev.c:306 input_to_handler+0x2a1/0x4d0 drivers/input/input.c:129 input_pass_values+0x5c9/0x840 drivers/input/input.c:161 input_event_dispose+0x37a/0x630 drivers/input/input.c:378 input_handle_event+0x11c/0xd80 drivers/input/input.c:406 input_inject_event+0x1bb/0x370 drivers/input/input.c:465 evdev_write+0x450/0x750 drivers/input/evdev.c:530 vfs_write+0x29a/0x1140 fs/read_write.c:588 ksys_write+0x1f8/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236 send_sigurg+0x22/0xc30 fs/fcntl.c:855 sk_send_sigurg+0x7a/0x370 net/core/sock.c:3411 tcp_check_urg net/ipv4/tcp_input.c:5784 [inline] tcp_urg+0x343/0xb80 net/ipv4/tcp_input.c:5825 tcp_rcv_established+0x8de/0x21b0 net/ipv4/tcp_input.c:6174 tcp_v4_do_rcv+0x707/0xab0 net/ipv4/tcp_ipv4.c:1909 tcp_v4_rcv+0x2ea0/0x3be0 net/ipv4/tcp_ipv4.c:2345 ip_protocol_deliver_rcu+0xba/0x4e0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c5/0x5d0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5625 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5739 process_backlog+0x133/0x760 net/core/dev.c:6068 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6722 napi_poll net/core/dev.c:6791 [inline] net_rx_action+0x9b6/0xf10 net/core/dev.c:6907 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:928 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:920 smpboot_thread_fn+0x661/0xa10 kernel/smpboot.c:164 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 f_modown+0x2a/0x380 fs/fcntl.c:93 __f_setown fs/fcntl.c:112 [inline] f_setown+0xd4/0x2a0 fs/fcntl.c:140 do_fcntl+0x11f7/0x1380 fs/fcntl.c:412 __do_sys_fcntl fs/fcntl.c:492 [inline] __se_sys_fcntl fs/fcntl.c:477 [inline] __x64_sys_fcntl+0x174/0x200 fs/fcntl.c:477 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 send_sigurg+0x22/0xc30 fs/fcntl.c:855 sk_send_sigurg+0x7a/0x370 net/core/sock.c:3411 queue_oob net/unix/af_unix.c:2186 [inline] unix_stream_sendmsg+0xe33/0x10f0 net/unix/af_unix.c:2304 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2585 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2639 __sys_sendmsg+0x117/0x1f0 net/socket.c:2668 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.2+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 send_sigio+0x28/0x3c0 fs/fcntl.c:816 kill_fasync_rcu fs/fcntl.c:1035 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x1f6/0x4f0 fs/fcntl.c:1042 wakeup_pipe_readers fs/splice.c:183 [inline] splice_pipe_to_pipe fs/splice.c:1865 [inline] do_splice+0xb55/0x1f90 fs/splice.c:1331 __do_splice+0x159/0x360 fs/splice.c:1436 __do_sys_splice fs/splice.c:1652 [inline] __se_sys_splice fs/splice.c:1634 [inline] __x64_sys_splice+0x1d2/0x260 fs/splice.c:1634 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1583 do_wait+0x219/0x570 kernel/exit.c:1627 kernel_wait+0xa0/0x160 kernel/exit.c:1803 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1583 do_wait+0x219/0x570 kernel/exit.c:1627 kernel_wait+0xa0/0x160 kernel/exit.c:1803 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 copy_process+0x441a/0x8f10 kernel/fork.c:2516 kernel_clone+0xfd/0x980 kernel/fork.c:2797 user_mode_thread+0xb4/0xf0 kernel/fork.c:2875 rest_init+0x23/0x2b0 init/main.c:712 start_kernel+0x3df/0x4c0 init/main.c:1103 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1583 do_wait+0x219/0x570 kernel/exit.c:1627 kernel_wait+0xa0/0x160 kernel/exit.c:1803 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 send_sigio+0xb4/0x3c0 fs/fcntl.c:830 kill_fasync_rcu fs/fcntl.c:1035 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x1f6/0x4f0 fs/fcntl.c:1042 pipe_release+0x197/0x320 fs/pipe.c:737 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f stack backtrace: CPU: 1 PID: 12213 Comm: syz-executor.0 Not tainted 6.10.0-rc3-syzkaller-00022-gcea2a26553ac #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline] check_irq_usage+0xe3c/0x1490 kernel/locking/lockdep.c:2865 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+0x248e/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 send_sigio+0xb4/0x3c0 fs/fcntl.c:830 kill_fasync_rcu fs/fcntl.c:1035 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x1f6/0x4f0 fs/fcntl.c:1042 pipe_release+0x197/0x320 fs/pipe.c:737 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f042967cea9 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:00007f042a3860c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f04297b3f80 RCX: 00007f042967cea9 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000005 RBP: 00007f04296ebff4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f04297b3f80 R15: 00007ffc78409ad8