===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected syzkaller #0 Not tainted ----------------------------------------------------- syz.1.2316/10142 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8c00a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigurg+0xcb/0x390 fs/fcntl.c:845 and this task is already holding: ffff888022815a38 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x25/0x390 fs/fcntl.c:829 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: (&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 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline] i8042_command drivers/input/serio/i8042.c:356 [inline] i8042_aux_write+0x105/0x170 drivers/input/serio/i8042.c:391 serio_write include/linux/serio.h:125 [inline] ps2_do_sendbyte+0x1f9/0x6f0 drivers/input/serio/libps2.c:40 ps2_sendbyte+0x5b/0x110 drivers/input/serio/libps2.c:92 cypress_ps2_sendbyte drivers/input/mouse/cypress_ps2.c:42 [inline] cypress_ps2_read_cmd_status drivers/input/mouse/cypress_ps2.c:116 [inline] cypress_send_ext_cmd+0x240/0x930 drivers/input/mouse/cypress_ps2.c:189 cypress_detect+0x8f/0x1a0 drivers/input/mouse/cypress_ps2.c:205 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1009 [inline] psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1023 [inline] psmouse_extensions+0xc00/0x1490 drivers/input/mouse/psmouse-base.c:1146 psmouse_switch_protocol+0x2e1/0x840 drivers/input/mouse/psmouse-base.c:1542 psmouse_connect+0x9ad/0x14b0 drivers/input/mouse/psmouse-base.c:1632 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 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 --> &f->f_owner.lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock#2); lock(&f->f_owner.lock); lock(&dev->event_lock#2); *** DEADLOCK *** 2 locks held by syz.1.2316/10142: #0: ffff88807ae37e90 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline] #0: ffff88807ae37e90 (&u->lock){+.+.}-{2:2}, at: queue_oob+0x353/0x800 net/unix/af_unix.c:1995 #1: ffff888022815a38 (&f->f_owner.lock){....}-{2:2}, at: send_sigurg+0x25/0x390 fs/fcntl.c:829 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 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:419 [inline] i8042_command drivers/input/serio/i8042.c:356 [inline] i8042_aux_write+0x105/0x170 drivers/input/serio/i8042.c:391 serio_write include/linux/serio.h:125 [inline] ps2_do_sendbyte+0x1f9/0x6f0 drivers/input/serio/libps2.c:40 ps2_sendbyte+0x5b/0x110 drivers/input/serio/libps2.c:92 cypress_ps2_sendbyte drivers/input/mouse/cypress_ps2.c:42 [inline] cypress_ps2_read_cmd_status drivers/input/mouse/cypress_ps2.c:116 [inline] cypress_send_ext_cmd+0x240/0x930 drivers/input/mouse/cypress_ps2.c:189 cypress_detect+0x8f/0x1a0 drivers/input/mouse/cypress_ps2.c:205 psmouse_do_detect drivers/input/mouse/psmouse-base.c:1009 [inline] psmouse_try_protocol drivers/input/mouse/psmouse-base.c:1023 [inline] psmouse_extensions+0xc00/0x1490 drivers/input/mouse/psmouse-base.c:1146 psmouse_switch_protocol+0x2e1/0x840 drivers/input/mouse/psmouse-base.c:1542 psmouse_connect+0x9ad/0x14b0 drivers/input/mouse/psmouse-base.c:1632 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 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_inject_event+0x9e/0x2c0 drivers/input/input.c:482 led_trigger_event+0x10a/0x1e0 drivers/leds/led-triggers.c:392 kbd_propagate_led_state drivers/tty/vt/keyboard.c:1075 [inline] kbd_bh+0x195/0x2a0 drivers/tty/vt/keyboard.c:1259 tasklet_action_common+0x2ad/0x410 kernel/softirq.c:806 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 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 do_con_trol drivers/tty/vt/vt.c:2484 [inline] do_con_write+0x449c/0x6b10 drivers/tty/vt/vt.c:2951 con_write+0x1f/0x40 drivers/tty/vt/vt.c:3295 process_output_block drivers/tty/n_tty.c:592 [inline] n_tty_write+0xd2e/0x1210 drivers/tty/n_tty.c:2339 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write+0x557/0x910 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x745/0xd60 fs/read_write.c:594 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 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 -> (&client->buffer_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:364 [inline] evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:126 [inline] input_pass_values+0x87e/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: [] evdev_open.__key.22+0x0/0x20 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:364 [inline] evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:126 [inline] input_pass_values+0x87e/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 -> (&new->fa_lock){....}-{2:2} { 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 fasync_remove_entry+0xf0/0x1c0 fs/fcntl.c:885 pipe_fasync+0x107/0x1f0 fs/pipe.c:752 __fput+0x7c4/0x930 fs/file_table.c:308 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 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 kill_fasync_rcu fs/fcntl.c:1008 [inline] kill_fasync+0x16d/0x490 fs/fcntl.c:1029 pipe_release+0x1ba/0x330 fs/pipe.c:734 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 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 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:126 [inline] input_pass_values+0x87e/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 -> (&f->f_owner.lock){....}-{2:2} { 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_sigio+0x2f/0x330 fs/fcntl.c:790 kill_fasync_rcu fs/fcntl.c:1015 [inline] kill_fasync+0x20a/0x490 fs/fcntl.c:1029 pipe_release+0x1ba/0x330 fs/pipe.c:734 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 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 pipe_release+0x1ba/0x330 fs/pipe.c:734 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 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_sigurg+0xcb/0x390 fs/fcntl.c:845 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137 queue_oob+0x622/0x800 net/unix/af_unix.c:2016 unix_stream_sendmsg+0xb71/0xc90 net/unix/af_unix.c:2116 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 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: 10142 Comm: syz.1.2316 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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 include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigurg+0xcb/0x390 fs/fcntl.c:845 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137 queue_oob+0x622/0x800 net/unix/af_unix.c:2016 unix_stream_sendmsg+0xb71/0xc90 net/unix/af_unix.c:2116 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 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: 0033:0x7fb4ee830e59 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:00007fb4eca8a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb4eeaa9fa0 RCX: 00007fb4ee830e59 RDX: 0000000024004011 RSI: 0000200000002740 RDI: 0000000000000003 RBP: 00007fb4ee8c6d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb4eeaaa038 R14: 00007fb4eeaa9fa0 R15: 00007ffe2e7b3c78