===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected syzkaller #0 Not tainted ----------------------------------------------------- syz.3.7326/26343 [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: ffff88807869f030 (&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+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __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: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+0x365/0x710 drivers/input/serio/i8042.c:610 __handle_irq_event_percpu+0x293/0xa50 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+0x59/0xd0 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+0xbc/0x120 kernel/locking/spinlock.c:194 debug_rcu_head_unqueue kernel/rcu/rcu.h:199 [inline] rcu_do_batch kernel/rcu/tree.c:2289 [inline] rcu_core+0xa13/0x1740 kernel/rcu/tree.c:2557 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 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+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] default_idle+0xb/0x10 arch/x86/kernel/process.c:741 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x20d/0x5a0 kernel/sched/idle.c:303 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281 secondary_startup_64_no_verify+0xcf/0xdb to a HARDIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire+0x1bb/0x4a0 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+0xd3/0x1c0 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+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 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 *** 5 locks held by syz.3.7326/26343: #0: ffff88807663a460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff888059a76790 (&type->i_mutex_dir_key#5){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888059a76790 (&type->i_mutex_dir_key#5){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff888059a76790 (&type->i_mutex_dir_key#5){++++}-{3:3}, at: path_openat+0x7d2/0x2ee0 fs/namei.c:3788 #2: ffffffff96cca788 (&fsnotify_mark_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #2: ffffffff96cca788 (&fsnotify_mark_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline] #2: ffffffff96cca788 (&fsnotify_mark_srcu){....}-{0:0}, at: fsnotify+0x529/0x1d00 fs/notify/fsnotify.c:568 #3: ffff8880576b6038 (&mark->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #3: ffff8880576b6038 (&mark->lock){+.+.}-{2:2}, at: dnotify_handle_event+0x5e/0x420 fs/notify/dnotify/dnotify.c:107 #4: ffff88807869f030 (&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+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __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: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+0x365/0x710 drivers/input/serio/i8042.c:610 __handle_irq_event_percpu+0x293/0xa50 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+0x59/0xd0 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+0xbc/0x120 kernel/locking/spinlock.c:194 debug_rcu_head_unqueue kernel/rcu/rcu.h:199 [inline] rcu_do_batch kernel/rcu/tree.c:2289 [inline] rcu_core+0xa13/0x1740 kernel/rcu/tree.c:2557 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 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+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] default_idle+0xb/0x10 arch/x86/kernel/process.c:741 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x20d/0x5a0 kernel/sched/idle.c:303 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281 secondary_startup_64_no_verify+0xcf/0xdb IN-SOFTIRQ-W at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __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: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+0x365/0x710 drivers/input/serio/i8042.c:610 __handle_irq_event_percpu+0x293/0xa50 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+0x59/0xd0 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+0xbc/0x120 kernel/locking/spinlock.c:194 debug_rcu_head_unqueue kernel/rcu/rcu.h:199 [inline] rcu_do_batch kernel/rcu/tree.c:2289 [inline] rcu_core+0xa13/0x1740 kernel/rcu/tree.c:2557 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 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+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] default_idle+0xb/0x10 arch/x86/kernel/process.c:741 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x20d/0x5a0 kernel/sched/idle.c:303 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401 start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281 secondary_startup_64_no_verify+0xcf/0xdb INITIAL USE at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __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+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+0x50c/0x910 drivers/leds/led-triggers.c:211 led_trigger_set_default+0x19c/0x1e0 drivers/leds/led-triggers.c:275 led_classdev_register_ext+0x625/0x860 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+0x6f8/0x9a0 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+0x182/0x1f0 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+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 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 -> (&new->fa_lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:988 [inline] kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 sock_wake_async+0x128/0x150 net/socket.c:-1 sk_wake_async include/net/sock.h:2641 [inline] sctp_data_ready+0x33b/0x4d0 net/sctp/socket.c:9290 sctp_ulpq_tail_event+0x7fa/0xb40 net/sctp/ulpqueue.c:257 do_ulpq_tail_event+0x133/0x1a0 net/sctp/stream_interleave.c:1301 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1471 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0xa8c/0x55f0 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x3ee/0x630 net/sctp/associola.c:1054 sctp_rcv+0xfe3/0x1720 net/sctp/input.c:258 sctp6_rcv+0x35/0x60 net/sctp/ipv6.c:1111 ip6_protocol_deliver_rcu+0x900/0x13a0 net/ipv6/ip6_input.c:438 ip6_input_finish+0x181/0x2c0 net/ipv6/ip6_input.c:483 NF_HOOK+0x329/0x3b0 include/linux/netfilter.h:302 NF_HOOK+0x329/0x3b0 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5607 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5721 process_backlog+0x38d/0x6f0 net/core/dev.c:6049 __napi_poll+0xc0/0x460 net/core/dev.c:6616 napi_poll net/core/dev.c:6683 [inline] net_rx_action+0x5dd/0xb20 net/core/dev.c:6797 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 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+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5666 __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] kernfs_iop_permission+0xc2/0x380 fs/kernfs/inode.c:291 do_inode_permission fs/namei.c:461 [inline] inode_permission+0x239/0x480 fs/namei.c:528 may_lookup fs/namei.c:1728 [inline] link_path_walk+0x2db/0xe70 fs/namei.c:2275 path_lookupat+0x9d/0x440 fs/namei.c:2486 filename_lookup+0x224/0x560 fs/namei.c:2516 vfs_statx+0x10e/0x620 fs/stat.c:229 vfs_fstatat fs/stat.c:267 [inline] __do_sys_newfstatat fs/stat.c:437 [inline] __se_sys_newfstatat fs/stat.c:431 [inline] __x64_sys_newfstatat+0x190/0x240 fs/stat.c:431 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL USE at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:326 fasync_remove_entry+0xf0/0x1c0 fs/fcntl.c:865 sock_fasync+0x84/0xf0 net/socket.c:1424 __fput+0x7a7/0x920 fs/file_table.c:317 task_work_run+0x1d0/0x260 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+0xee/0x180 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:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:988 [inline] kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 sock_wake_async+0x128/0x150 net/socket.c:-1 sk_wake_async+0x17f/0x280 include/net/sock.h:2641 mptcp_destroy_common+0x10f/0x4b0 net/mptcp/protocol.c:3505 mptcp_disconnect+0x162/0x4a0 net/mptcp/protocol.c:3272 inet_shutdown+0x1ba/0x370 net/ipv4/af_inet.c:942 __sys_shutdown_sock net/socket.c:2359 [inline] __sys_shutdown net/socket.c:2371 [inline] __do_sys_shutdown net/socket.c:2379 [inline] __se_sys_shutdown net/socket.c:2377 [inline] __x64_sys_shutdown+0x16d/0x1d0 net/socket.c:2377 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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+0xb8/0x100 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:988 [inline] kill_fasync+0x18e/0x4b0 fs/fcntl.c:1009 mousedev_notify_readers+0x6eb/0xc00 drivers/input/mousedev.c:309 mousedev_event+0x568/0x11f0 drivers/input/mousedev.c:394 input_to_handler drivers/input/input.c:130 [inline] input_pass_values+0x9c7/0x12f0 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+0x35b/0x490 drivers/input/evdev.c:530 vfs_write+0x2e6/0xa30 fs/read_write.c:582 ksys_write+0x14c/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb8/0x100 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 sock_wake_async+0x128/0x150 net/socket.c:-1 sk_wake_async include/net/sock.h:2641 [inline] sctp_data_ready+0x33b/0x4d0 net/sctp/socket.c:9290 sctp_ulpq_tail_event+0x7fa/0xb40 net/sctp/ulpqueue.c:257 do_ulpq_tail_event+0x133/0x1a0 net/sctp/stream_interleave.c:1301 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1471 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0xa8c/0x55f0 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x3ee/0x630 net/sctp/associola.c:1054 sctp_rcv+0xfe3/0x1720 net/sctp/input.c:258 sctp6_rcv+0x35/0x60 net/sctp/ipv6.c:1111 ip6_protocol_deliver_rcu+0x900/0x13a0 net/ipv6/ip6_input.c:438 ip6_input_finish+0x181/0x2c0 net/ipv6/ip6_input.c:483 NF_HOOK+0x329/0x3b0 include/linux/netfilter.h:302 NF_HOOK+0x329/0x3b0 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5607 [inline] __netif_receive_skb+0xcc/0x290 net/core/dev.c:5721 process_backlog+0x38d/0x6f0 net/core/dev.c:6049 __napi_poll+0xc0/0x460 net/core/dev.c:6616 napi_poll net/core/dev.c:6683 [inline] net_rx_action+0x5dd/0xb20 net/core/dev.c:6797 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 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+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5666 __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] kernfs_iop_permission+0xc2/0x380 fs/kernfs/inode.c:291 do_inode_permission fs/namei.c:461 [inline] inode_permission+0x239/0x480 fs/namei.c:528 may_lookup fs/namei.c:1728 [inline] link_path_walk+0x2db/0xe70 fs/namei.c:2275 path_lookupat+0x9d/0x440 fs/namei.c:2486 filename_lookup+0x224/0x560 fs/namei.c:2516 vfs_statx+0x10e/0x620 fs/stat.c:229 vfs_fstatat fs/stat.c:267 [inline] __do_sys_newfstatat fs/stat.c:437 [inline] __se_sys_newfstatat fs/stat.c:431 [inline] __x64_sys_newfstatat+0x190/0x240 fs/stat.c:431 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL USE at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xab/0xf0 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+0x5ed/0x1270 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:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 INITIAL READ USE at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236 send_sigurg+0x25/0x3c0 fs/fcntl.c:809 sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3374 queue_oob+0x3ed/0x4f0 net/unix/af_unix.c:2151 unix_stream_sendmsg+0x8cf/0xa70 net/unix/af_unix.c:2252 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmsg net/socket.c:2601 [inline] __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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+0xb8/0x100 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 sock_wake_async+0x128/0x150 net/socket.c:-1 sk_wake_async+0x17f/0x280 include/net/sock.h:2641 mptcp_destroy_common+0x10f/0x4b0 net/mptcp/protocol.c:3505 mptcp_disconnect+0x162/0x4a0 net/mptcp/protocol.c:3272 inet_shutdown+0x1ba/0x370 net/ipv4/af_inet.c:942 __sys_shutdown_sock net/socket.c:2359 [inline] __sys_shutdown net/socket.c:2371 [inline] __do_sys_shutdown net/socket.c:2379 [inline] __se_sys_shutdown net/socket.c:2377 [inline] __x64_sys_shutdown+0x16d/0x1d0 net/socket.c:2377 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 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+0x1bb/0x4a0 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+0xd3/0x1c0 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+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 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+0x1bb/0x4a0 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+0xd3/0x1c0 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+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 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+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:326 copy_process+0x2557/0x4030 kernel/fork.c:2481 kernel_clone+0x24b/0x900 kernel/fork.c:2762 user_mode_thread+0x10d/0x180 kernel/fork.c:2838 rest_init+0x23/0x300 init/main.c:710 start_kernel+0x0/0x53c init/main.c:905 start_kernel+0x493/0x53c init/main.c:1152 secondary_startup_64_no_verify+0xcf/0xdb INITIAL READ USE at: lock_acquire+0x1bb/0x4a0 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+0xd3/0x1c0 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+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 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 dnotify_handle_event+0x14f/0x420 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event fs/notify/fsnotify.c:282 [inline] fsnotify_handle_event fs/notify/fsnotify.c:337 [inline] send_to_group fs/notify/fsnotify.c:385 [inline] fsnotify+0x191c/0x1d00 fs/notify/fsnotify.c:591 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_dirent include/linux/fsnotify.h:42 [inline] fsnotify_create include/linux/fsnotify.h:213 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x137c/0x2ee0 fs/namei.c:3788 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 stack backtrace: CPU: 1 PID: 26343 Comm: syz.3.7326 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e 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+0x66c8/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 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 dnotify_handle_event+0x14f/0x420 fs/notify/dnotify/dnotify.c:115 fsnotify_handle_inode_event fs/notify/fsnotify.c:282 [inline] fsnotify_handle_event fs/notify/fsnotify.c:337 [inline] send_to_group fs/notify/fsnotify.c:385 [inline] fsnotify+0x191c/0x1d00 fs/notify/fsnotify.c:591 fsnotify_name include/linux/fsnotify.h:36 [inline] fsnotify_dirent include/linux/fsnotify.h:42 [inline] fsnotify_create include/linux/fsnotify.h:213 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x137c/0x2ee0 fs/namei.c:3788 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe52179c799 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:00007fe52265f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fe521a15fa0 RCX: 00007fe52179c799 RDX: 0000000000002040 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007fe521832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe521a16038 R14: 00007fe521a15fa0 R15: 00007ffecc872498