===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 6.1.148-syzkaller #0 Not tainted ----------------------------------------------------- syz.5.7903/25389 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8c80a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xf5/0x360 fs/fcntl.c:784 and this task is already holding: ffff88807798d7b0 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:770 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+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162 input_event+0x76/0xb0 drivers/input/input.c:430 input_report_key include/linux/input.h:425 [inline] psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:121 [inline] psmouse_report_standard_packet+0x4f/0x200 drivers/input/mouse/psmouse-base.c:139 psmouse_process_byte+0x42b/0x620 drivers/input/mouse/psmouse-base.c:230 psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:272 psmouse_interrupt+0x699/0x1130 drivers/input/mouse/psmouse-base.c:424 serio_interrupt+0x87/0x130 drivers/input/serio/serio.c:998 i8042_interrupt+0x36b/0x720 drivers/input/serio/i8042.c:610 __handle_irq_event_percpu+0x298/0xa30 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x87/0x1e0 kernel/irq/handle.c:210 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:682 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] klist_next+0x272/0x2f0 lib/klist.c:401 next_device drivers/base/bus.c:260 [inline] bus_for_each_dev+0x146/0x1e0 drivers/base/bus.c:302 bus_add_driver+0x30a/0x5a0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_register_driver+0x202/0x3d0 drivers/usb/core/driver.c:1062 do_one_initcall+0x214/0x7a0 init/main.c:1298 do_initcall_level+0x137/0x1e4 init/main.c:1371 do_initcalls+0x4b/0x8a init/main.c:1387 kernel_init_freeable+0x3fa/0x5ac init/main.c:1626 kernel_init+0x19/0x1b0 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 to a HARDIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire+0x1b4/0x490 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+0x2b6/0xb60 kernel/exit.c:1605 kernel_wait+0xa8/0x160 kernel/exit.c:1795 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 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 *** 6 locks held by syz.5.7903/25389: #0: ffff8880277dc460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffffffff8cc68cd0 (file_rwsem){.+.+}-{0:0}, at: __break_lease+0x17f/0x1420 fs/locks.c:1492 #2: ffff888024ce0f38 (&ctx->flc_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffff888024ce0f38 (&ctx->flc_lock){+.+.}-{2:2}, at: __break_lease+0x18c/0x1420 fs/locks.c:1493 #3: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #3: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #3: ffffffff8cb2ade0 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x4f/0x4b0 fs/fcntl.c:1008 #4: ffff8880296b49f0 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:988 [inline] #4: ffff8880296b49f0 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 #5: ffff88807798d7b0 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x2f/0x360 fs/fcntl.c:770 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&dev->event_lock#2){-...}-{2:2} { IN-HARDIRQ-W at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162 input_event+0x76/0xb0 drivers/input/input.c:430 input_report_key include/linux/input.h:425 [inline] psmouse_report_standard_buttons drivers/input/mouse/psmouse-base.c:121 [inline] psmouse_report_standard_packet+0x4f/0x200 drivers/input/mouse/psmouse-base.c:139 psmouse_process_byte+0x42b/0x620 drivers/input/mouse/psmouse-base.c:230 psmouse_handle_byte+0x43/0x490 drivers/input/mouse/psmouse-base.c:272 psmouse_interrupt+0x699/0x1130 drivers/input/mouse/psmouse-base.c:424 serio_interrupt+0x87/0x130 drivers/input/serio/serio.c:998 i8042_interrupt+0x36b/0x720 drivers/input/serio/i8042.c:610 __handle_irq_event_percpu+0x298/0xa30 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x87/0x1e0 kernel/irq/handle.c:210 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:682 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xa5/0x100 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] klist_next+0x272/0x2f0 lib/klist.c:401 next_device drivers/base/bus.c:260 [inline] bus_for_each_dev+0x146/0x1e0 drivers/base/bus.c:302 bus_add_driver+0x30a/0x5a0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_register_driver+0x202/0x3d0 drivers/usb/core/driver.c:1062 do_one_initcall+0x214/0x7a0 init/main.c:1298 do_initcall_level+0x137/0x1e4 init/main.c:1371 do_initcalls+0x4b/0x8a init/main.c:1387 kernel_init_freeable+0x3fa/0x5ac init/main.c:1626 kernel_init+0x19/0x1b0 init/main.c:1514 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INITIAL USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa4/0xf0 kernel/locking/spinlock.c:162 input_inject_event+0xa7/0x310 drivers/input/input.c:456 led_trigger_event+0x12f/0x210 drivers/leds/led-triggers.c:392 kbd_led_trigger_activate+0xb9/0x100 drivers/tty/vt/keyboard.c:1036 led_trigger_set+0x504/0x900 drivers/leds/led-triggers.c:211 led_trigger_set_default+0x19c/0x1e0 drivers/leds/led-triggers.c:275 led_classdev_register_ext+0x5d3/0x7a0 drivers/leds/led-class.c:426 led_classdev_register include/linux/leds.h:196 [inline] input_leds_connect+0x4e7/0x6b0 drivers/input/input-leds.c:139 input_attach_handler drivers/input/input.c:1060 [inline] input_register_device+0xdfd/0x1310 drivers/input/input.c:2470 atkbd_connect+0x6e9/0x980 drivers/input/keyboard/atkbd.c:1322 serio_connect_driver drivers/input/serio/serio.c:44 [inline] serio_driver_probe+0x76/0x90 drivers/input/serio/serio.c:775 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x2aa/0xc70 drivers/base/dd.c:639 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:785 driver_probe_device+0x4f/0x420 drivers/base/dd.c:815 __driver_attach+0x44a/0x6e0 drivers/base/dd.c:1201 bus_for_each_dev+0x175/0x1e0 drivers/base/bus.c:303 serio_attach_driver drivers/input/serio/serio.c:804 [inline] serio_handle_event+0x29c/0x840 drivers/input/serio/serio.c:224 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 } ... key at: [] input_allocate_device.__key.5+0x0/0x20 -> (&client->buffer_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1b4/0x490 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+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1d4/0x320 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:159 input_event_dispose+0x346/0x6c0 drivers/input/input.c:374 input_inject_event+0x1f5/0x310 drivers/input/input.c:461 evdev_write+0x326/0x470 drivers/input/evdev.c:530 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] evdev_open.__key.29+0x0/0x20 ... acquired at: __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+0xcb/0xab0 drivers/input/evdev.c:261 evdev_events+0x1d4/0x320 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:159 input_event_dispose+0x346/0x6c0 drivers/input/input.c:374 input_inject_event+0x1f5/0x310 drivers/input/input.c:461 evdev_write+0x326/0x470 drivers/input/evdev.c:530 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:326 fasync_remove_entry+0xf0/0x1c0 fs/fcntl.c:865 lease_modify+0x1a2/0x390 fs/locks.c:1386 locks_remove_lease fs/locks.c:2622 [inline] locks_remove_file+0x492/0xdf0 fs/locks.c:2647 __fput+0x188/0x920 fs/file_table.c:312 task_work_run+0x1ca/0x250 kernel/task_work.c:203 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:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xac/0xf0 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:988 [inline] kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1d4/0x320 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:159 input_event_dispose+0x346/0x6c0 drivers/input/input.c:374 input_inject_event+0x1f5/0x310 drivers/input/input.c:461 evdev_write+0x326/0x470 drivers/input/evdev.c:530 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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+0xac/0xf0 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:988 [inline] kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1d4/0x320 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:159 input_event_dispose+0x346/0x6c0 drivers/input/input.c:374 input_inject_event+0x1f5/0x310 drivers/input/input.c:461 evdev_write+0x326/0x470 drivers/input/evdev.c:530 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 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+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xac/0xf0 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x3c0 fs/fcntl.c:809 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3366 tcp_check_urg+0x200/0x750 net/ipv4/tcp_input.c:5716 tcp_urg+0x15d/0x3e0 net/ipv4/tcp_input.c:5757 tcp_rcv_established+0xde4/0x1d30 net/ipv4/tcp_input.c:6110 tcp_v4_do_rcv+0x48d/0xb00 net/ipv4/tcp_ipv4.c:1683 tcp_v4_rcv+0x2789/0x2e30 net/ipv4/tcp_ipv4.c:2114 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5569 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5683 process_backlog+0x37c/0x6e0 net/core/dev.c:6011 __napi_poll+0xc0/0x460 net/core/dev.c:6578 napi_poll net/core/dev.c:6645 [inline] net_rx_action+0x5b1/0xad0 net/core/dev.c:6759 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 INITIAL USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:326 __f_setown+0x37/0x330 fs/fcntl.c:91 fcntl_dirnotify+0x6de/0x8f0 fs/notify/dnotify/dnotify.c:369 do_fcntl+0x587/0x11c0 fs/fcntl.c:398 __do_sys_fcntl fs/fcntl.c:446 [inline] __se_sys_fcntl+0xc9/0x190 fs/fcntl.c:431 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xac/0xf0 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x360 fs/fcntl.c:770 dnotify_handle_event+0x14f/0x420 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event fs/notify/fsnotify.c:275 [inline] fsnotify_handle_event fs/notify/fsnotify.c:304 [inline] send_to_group fs/notify/fsnotify.c:378 [inline] fsnotify+0x165a/0x1cc0 fs/notify/fsnotify.c:584 __fsnotify_parent+0x5ae/0x6e0 fs/notify/fsnotify.c:241 fsnotify_parent include/linux/fsnotify.h:77 [inline] fsnotify_dentry include/linux/fsnotify.h:89 [inline] fsnotify_xattr include/linux/fsnotify.h:355 [inline] __vfs_setxattr_noperm+0x458/0x5e0 fs/xattr.c:219 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 __do_sys_fsetxattr fs/xattr.c:673 [inline] __se_sys_fsetxattr+0x15e/0x1d0 fs/xattr.c:662 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 } ... key at: [] __alloc_file.__key+0x0/0x10 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xac/0xf0 kernel/locking/spinlock.c:236 send_sigio+0x2f/0x360 fs/fcntl.c:770 kill_fasync_rcu fs/fcntl.c:995 [inline] kill_fasync+0x224/0x4b0 fs/fcntl.c:1009 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278 evdev_events+0x1d4/0x320 drivers/input/evdev.c:306 input_to_handler drivers/input/input.c:127 [inline] input_pass_values+0x907/0x1300 drivers/input/input.c:159 input_event_dispose+0x346/0x6c0 drivers/input/input.c:374 input_inject_event+0x1f5/0x310 drivers/input/input.c:461 evdev_write+0x326/0x470 drivers/input/evdev.c:530 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0x1b4/0x490 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+0x2b6/0xb60 kernel/exit.c:1605 kernel_wait+0xa8/0x160 kernel/exit.c:1795 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 SOFTIRQ-ON-R at: lock_acquire+0x1b4/0x490 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+0x2b6/0xb60 kernel/exit.c:1605 kernel_wait+0xa8/0x160 kernel/exit.c:1795 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INITIAL USE at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:326 copy_process+0x2531/0x4020 kernel/fork.c:2476 kernel_clone+0x225/0x8b0 kernel/fork.c:2757 user_mode_thread+0xda/0x130 kernel/fork.c:2833 rest_init+0x23/0x300 init/main.c:698 start_kernel+0x0/0x539 init/main.c:893 start_kernel+0x490/0x539 init/main.c:1140 secondary_startup_64_no_verify+0xcf/0xdb INITIAL READ USE at: lock_acquire+0x1b4/0x490 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+0x2b6/0xb60 kernel/exit.c:1605 kernel_wait+0xa8/0x160 kernel/exit.c:1795 call_usermodehelper_exec_sync kernel/umh.c:140 [inline] call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:167 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228 send_sigio+0xf5/0x360 fs/fcntl.c:784 kill_fasync_rcu fs/fcntl.c:995 [inline] kill_fasync+0x224/0x4b0 fs/fcntl.c:1009 lease_break_callback+0x22/0x30 fs/locks.c:521 __break_lease+0x4a3/0x1420 fs/locks.c:1521 vfs_truncate+0x1fb/0x2f0 fs/open.c:105 do_sys_truncate+0xdc/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 stack backtrace: CPU: 0 PID: 25389 Comm: syz.5.7903 Not tainted 6.1.148-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e 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 kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x660b/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 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+0xf5/0x360 fs/fcntl.c:784 kill_fasync_rcu fs/fcntl.c:995 [inline] kill_fasync+0x224/0x4b0 fs/fcntl.c:1009 lease_break_callback+0x22/0x30 fs/locks.c:521 __break_lease+0x4a3/0x1420 fs/locks.c:1521 vfs_truncate+0x1fb/0x2f0 fs/open.c:105 do_sys_truncate+0xdc/0x190 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0491b8ebe9 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:00007f04929a4038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f0491db5fa0 RCX: 00007f0491b8ebe9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007f0491c11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0491db6038 R14: 00007f0491db5fa0 R15: 00007fff65300c78