syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Tainted: G             L     
-----------------------------------------------------
syz.3.5416/27979 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8e40c058 (tasklist_lock){.+.+}-{3:3}, at: send_sigio+0x101/0x370 fs/fcntl.c:932

and this task is already holding:
ffff88807ebf29a0 (&f_owner->lock){....}-{3:3}, at: send_sigio+0x38/0x370 fs/fcntl.c:918
which would create a new lock dependency:
 (&f_owner->lock){....}-{3:3} -> (tasklist_lock){.+.+}-{3:3}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&client->buffer_lock){..-.}-{3:3}

... which became SOFTIRQ-irq-safe at:
  lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
  __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
  _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:341 [inline]
  evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
  evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
  input_pass_values+0x288/0x890 drivers/input/input.c:128
  input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:353
  input_event+0x89/0xe0 drivers/input/input.c:396
  hidinput_hid_event+0x14cb/0x1ed0 drivers/hid/hid-input.c:1754
  hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1565
  hid_process_report drivers/hid/hid-core.c:1713 [inline]
  hid_report_raw_event+0xec2/0x1730 drivers/hid/hid-core.c:2075
  __hid_input_report drivers/hid/hid-core.c:2145 [inline]
  hid_input_report+0x44b/0x580 drivers/hid/hid-core.c:2167
  hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
  __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
  dummy_timer+0xbbd/0x4650 drivers/usb/gadget/udc/dummy_hcd.c:2005
  __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
  __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
  hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
  handle_softirqs+0x22a/0x870 kernel/softirq.c:622
  __do_softirq kernel/softirq.c:656 [inline]
  invoke_softirq kernel/softirq.c:496 [inline]
  __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
  irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
  sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
  asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
  __asan_memset+0x22/0x50 mm/kasan/shadow.c:84
  unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607
  __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773
  unwind_start arch/x86/include/asm/unwind.h:64 [inline]
  arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
  stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
  save_stack+0x122/0x230 mm/page_owner.c:165
  __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
  reset_page_owner include/linux/page_owner.h:25 [inline]
  __free_pages_prepare mm/page_alloc.c:1433 [inline]
  free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040
  folios_put_refs+0x789/0x8d0 mm/swap.c:1002
  free_pages_and_swap_cache+0x2e7/0x5b0 mm/swap_state.c:423
  __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
  tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
  tlb_flush_mmu_free mm/mmu_gather.c:398 [inline]
  tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:405
  tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530
  exit_mmap+0x498/0xa10 mm/mmap.c:1315
  __mmput+0x118/0x430 kernel/fork.c:1175
  exit_mm+0x168/0x220 kernel/exit.c:581
  do_exit+0x6a2/0x23c0 kernel/exit.c:964
  do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
  __do_sys_exit_group kernel/exit.c:1129 [inline]
  __se_sys_exit_group kernel/exit.c:1127 [inline]
  __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127
  x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
  do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
  entry_SYSCALL_64_after_hwframe+0x77/0x7f

to a SOFTIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{3:3}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
  __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
  _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
  __do_wait+0xde/0x740 kernel/exit.c:1678
  do_wait+0x1e7/0x540 kernel/exit.c:1722
  kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
  call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
  call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
  process_one_work kernel/workqueue.c:3288 [inline]
  process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3371
  worker_thread+0xa53/0xfc0 kernel/workqueue.c:3452
  kthread+0x388/0x470 kernel/kthread.c:436
  ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

other info that might help us debug this:

Chain exists of:
  &client->buffer_lock --> &f_owner->lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&client->buffer_lock);
                               lock(&f_owner->lock);
  <Interrupt>
    lock(&client->buffer_lock);

 *** DEADLOCK ***

5 locks held by syz.3.5416/27979:
 #0: ffff88802c9aa420 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #1: ffff888056a0e608 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
 #1: ffff888056a0e608 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: open_last_lookups fs/namei.c:4608 [inline]
 #1: ffff888056a0e608 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: path_openat+0xb4c/0x3860 fs/namei.c:4855
 #2: ffffffff9a2fe7f8 (&fsnotify_mark_srcu){.+.?}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
 #2: ffffffff9a2fe7f8 (&fsnotify_mark_srcu){.+.?}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
 #2: ffffffff9a2fe7f8 (&fsnotify_mark_srcu){.+.?}-{0:0}, at: fsnotify+0x74c/0x1ae0 fs/notify/fsnotify.c:563
 #3: ffff888035c83808 (&mark->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
 #3: ffff888035c83808 (&mark->lock){+.+.}-{3:3}, at: dnotify_handle_event+0x62/0x440 fs/notify/dnotify/dnotify.c:105
 #4: ffff88807ebf29a0 (&f_owner->lock){....}-{3:3}, at: send_sigio+0x38/0x370 fs/fcntl.c:918

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&client->buffer_lock){..-.}-{3:3} {
     IN-SOFTIRQ-W at:
                        lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
                        _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
                        spin_lock include/linux/spinlock.h:341 [inline]
                        evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
                        evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                        input_pass_values+0x288/0x890 drivers/input/input.c:128
                        input_event_dispose+0x3e5/0x6b0 drivers/input/input.c:353
                        input_event+0x89/0xe0 drivers/input/input.c:396
                        hidinput_hid_event+0x14cb/0x1ed0 drivers/hid/hid-input.c:1754
                        hid_process_event+0x4be/0x620 drivers/hid/hid-core.c:1565
                        hid_process_report drivers/hid/hid-core.c:1713 [inline]
                        hid_report_raw_event+0xec2/0x1730 drivers/hid/hid-core.c:2075
                        __hid_input_report drivers/hid/hid-core.c:2145 [inline]
                        hid_input_report+0x44b/0x580 drivers/hid/hid-core.c:2167
                        hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
                        __usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1657
                        dummy_timer+0xbbd/0x4650 drivers/usb/gadget/udc/dummy_hcd.c:2005
                        __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
                        __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
                        hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
                        handle_softirqs+0x22a/0x870 kernel/softirq.c:622
                        __do_softirq kernel/softirq.c:656 [inline]
                        invoke_softirq kernel/softirq.c:496 [inline]
                        __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
                        irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
                        instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
                        sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
                        asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
                        __asan_memset+0x22/0x50 mm/kasan/shadow.c:84
                        unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607
                        __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773
                        unwind_start arch/x86/include/asm/unwind.h:64 [inline]
                        arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
                        stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
                        save_stack+0x122/0x230 mm/page_owner.c:165
                        __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
                        reset_page_owner include/linux/page_owner.h:25 [inline]
                        __free_pages_prepare mm/page_alloc.c:1433 [inline]
                        free_unref_folios+0xed5/0x16d0 mm/page_alloc.c:3040
                        folios_put_refs+0x789/0x8d0 mm/swap.c:1002
                        free_pages_and_swap_cache+0x2e7/0x5b0 mm/swap_state.c:423
                        __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline]
                        tlb_batch_pages_flush mm/mmu_gather.c:151 [inline]
                        tlb_flush_mmu_free mm/mmu_gather.c:398 [inline]
                        tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:405
                        tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530
                        exit_mmap+0x498/0xa10 mm/mmap.c:1315
                        __mmput+0x118/0x430 kernel/fork.c:1175
                        exit_mm+0x168/0x220 kernel/exit.c:581
                        do_exit+0x6a2/0x23c0 kernel/exit.c:964
                        do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
                        __do_sys_exit_group kernel/exit.c:1129 [inline]
                        __se_sys_exit_group kernel/exit.c:1127 [inline]
                        __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127
                        x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
                        do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                        do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
     INITIAL USE at:
                       lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                       __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
                       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
                       spin_lock include/linux/spinlock.h:341 [inline]
                       evdev_pass_values+0xb9/0xbd0 drivers/input/evdev.c:261
                       evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
                       input_pass_values+0x288/0x890 drivers/input/input.c:128
                       input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
                       input_inject_event+0x1dd/0x340 drivers/input/input.c:424
                       evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
                       vfs_write+0x29a/0xb90 fs/read_write.c:686
                       ksys_write+0x150/0x270 fs/read_write.c:740
                       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                       do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                       entry_SYSCALL_64_after_hwframe+0x77/0x7f
   }
   ... key      at: [<ffffffff9a61b000>] evdev_open.__key.27+0x0/0x20
 -> (&new->fa_lock){...-}-{3:3} {
    IN-SOFTIRQ-R at:
                      lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                      __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
                      _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
                      kill_fasync_rcu fs/fcntl.c:1135 [inline]
                      kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
                      sock_wake_async+0x137/0x160 net/socket.c:-1
                      sk_wake_async_rcu include/net/sock.h:2579 [inline]
                      sock_def_readable+0x3c1/0x580 net/core/sock.c:3613
                      tcp_data_queue+0x1e2e/0x5e50 net/ipv4/tcp_input.c:5714
                      tcp_rcv_established+0xf45/0x2740 net/ipv4/tcp_input.c:6708
                      tcp_v4_do_rcv+0xa90/0x1430 net/ipv4/tcp_ipv4.c:1884
                      tcp_v4_rcv+0x2825/0x31f0 net/ipv4/tcp_ipv4.c:2319
                      ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:207
                      ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241
                      NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
                      NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
                      __netif_receive_skb_one_core net/core/dev.c:6181 [inline]
                      __netif_receive_skb net/core/dev.c:6294 [inline]
                      process_backlog+0xaa3/0x1950 net/core/dev.c:6645
                      __napi_poll+0xae/0x340 net/core/dev.c:7709
                      napi_poll net/core/dev.c:7772 [inline]
                      net_rx_action+0x627/0xf70 net/core/dev.c:7929
                      handle_softirqs+0x22a/0x870 kernel/softirq.c:622
                      do_softirq+0x76/0xd0 kernel/softirq.c:523
                      __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
                      sk_stream_wait_memory+0x72b/0xf80 net/core/stream.c:149
                      tcp_sendmsg_locked+0x23ba/0x5490 net/ipv4/tcp.c:1418
                      tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1465
                      sock_sendmsg_nosec net/socket.c:792 [inline]
                      __sock_sendmsg net/socket.c:807 [inline]
                      __sys_sendto+0x5de/0x710 net/socket.c:2271
                      __do_sys_sendto net/socket.c:2278 [inline]
                      __se_sys_sendto net/socket.c:2274 [inline]
                      __x64_sys_sendto+0xde/0x100 net/socket.c:2274
                      do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                      do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                      entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL USE at:
                     lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                     _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                     fasync_remove_entry+0xf1/0x1c0 fs/fcntl.c:1012
                     sock_fasync+0x85/0xf0 net/socket.c:1545
                     __fput+0x8a5/0xa70 fs/file_table.c:466
                     task_work_run+0x1d9/0x270 kernel/task_work.c:233
                     resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
                     __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
                     exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
                     __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
                     syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
                     syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
                     do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
                          _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:1135 [inline]
                          kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
                          lease_break_callback+0x26/0x30 fs/locks.c:577
                          __break_lease+0x81c/0x1e80 fs/locks.c:1657
                          break_deleg include/linux/filelock.h:504 [inline]
                          try_break_deleg include/linux/filelock.h:523 [inline]
                          vfs_unlink+0x561/0x6c0 fs/namei.c:5492
                          filename_unlinkat+0x3cd/0x610 fs/namei.c:5568
                          __do_sys_unlink fs/namei.c:5603 [inline]
                          __se_sys_unlink+0x2e/0x140 fs/namei.c:5600
                          do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                          do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff9a2fb700>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1135 [inline]
   kill_fasync+0x199/0x4d0 fs/fcntl.c:1159
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x627/0xbd0 drivers/input/evdev.c:278
   evdev_events+0x1e6/0x340 drivers/input/evdev.c:306
   input_pass_values+0x288/0x890 drivers/input/input.c:128
   input_event_dispose+0x330/0x6b0 drivers/input/input.c:342
   input_inject_event+0x1dd/0x340 drivers/input/input.c:424
   evdev_write+0x325/0x4c0 drivers/input/evdev.c:528
   vfs_write+0x29a/0xb90 fs/read_write.c:686
   ksys_write+0x150/0x270 fs/read_write.c:740
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&f_owner->lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                   _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                   __f_setown+0x67/0x370 fs/fcntl.c:136
                   generic_add_lease fs/locks.c:1908 [inline]
                   generic_setlease+0xacf/0xff0 fs/locks.c:1984
                   do_fcntl_add_lease+0x35e/0x470 fs/locks.c:2086
                   fcntl_setdeleg+0x14c/0x1e0 fs/locks.c:2132
                   do_fcntl+0xe6d/0x1a20 fs/fcntl.c:564
                   __do_sys_fcntl fs/fcntl.c:602 [inline]
                   __se_sys_fcntl+0xc8/0x150 fs/fcntl.c:587
                   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                   do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
                        _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
                        send_sigio+0x38/0x370 fs/fcntl.c:918
                        kill_fasync_rcu fs/fcntl.c:1144 [inline]
                        kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
                        lease_break_callback+0x26/0x30 fs/locks.c:577
                        __break_lease+0x81c/0x1e80 fs/locks.c:1657
                        break_deleg include/linux/filelock.h:504 [inline]
                        try_break_deleg include/linux/filelock.h:523 [inline]
                        vfs_unlink+0x561/0x6c0 fs/namei.c:5492
                        filename_unlinkat+0x3cd/0x610 fs/namei.c:5568
                        __do_sys_unlink fs/namei.c:5603 [inline]
                        __se_sys_unlink+0x2e/0x140 fs/namei.c:5600
                        do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
                        do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff9a2fb6e0>] file_f_owner_allocate.__key+0x0/0x20
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
   _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
   send_sigio+0x38/0x370 fs/fcntl.c:918
   kill_fasync_rcu fs/fcntl.c:1144 [inline]
   kill_fasync+0x24d/0x4d0 fs/fcntl.c:1159
   lease_break_callback+0x26/0x30 fs/locks.c:577
   __break_lease+0x81c/0x1e80 fs/locks.c:1657
   break_deleg include/linux/filelock.h:504 [inline]
   try_break_deleg include/linux/filelock.h:523 [inline]
   vfs_unlink+0x561/0x6c0 fs/namei.c:5492
   filename_unlinkat+0x3cd/0x610 fs/namei.c:5568
   __do_sys_unlink fs/namei.c:5603 [inline]
   __se_sys_unlink+0x2e/0x140 fs/namei.c:5600
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{3:3} {
   HARDIRQ-ON-R at:
                    lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                    __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                    _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                    __do_wait+0xde/0x740 kernel/exit.c:1678
                    do_wait+0x1e7/0x540 kernel/exit.c:1722
                    kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                    call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                    call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                    process_one_work kernel/workqueue.c:3288 [inline]
                    process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3371
                    worker_thread+0xa53/0xfc0 kernel/workqueue.c:3452
                    kthread+0x388/0x470 kernel/kthread.c:436
                    ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   SOFTIRQ-ON-R at:
                    lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                    __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                    _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                    __do_wait+0xde/0x740 kernel/exit.c:1678
                    do_wait+0x1e7/0x540 kernel/exit.c:1722
                    kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                    call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                    call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                    process_one_work kernel/workqueue.c:3288 [inline]
                    process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3371
                    worker_thread+0xa53/0xfc0 kernel/workqueue.c:3452
                    kthread+0x388/0x470 kernel/kthread.c:436
                    ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
   INITIAL USE at:
                   lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:211 [inline]
                   _raw_write_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:326
                   copy_process+0x247a/0x3cd0 kernel/fork.c:2369
                   kernel_clone+0x248/0x8e0 kernel/fork.c:2653
                   user_mode_thread+0x110/0x180 kernel/fork.c:2729
                   rest_init+0x23/0x300 init/main.c:725
                   start_kernel+0x385/0x3d0 init/main.c:1210
                   x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
                   x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
                   common_startup_64+0x13e/0x147
   INITIAL READ USE at:
                        lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
                        __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
                        _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
                        __do_wait+0xde/0x740 kernel/exit.c:1678
                        do_wait+0x1e7/0x540 kernel/exit.c:1722
                        kernel_wait+0xd6/0x1c0 kernel/exit.c:1898
                        call_usermodehelper_exec_sync kernel/umh.c:136 [inline]
                        call_usermodehelper_exec_work+0xbe/0x230 kernel/umh.c:163
                        process_one_work kernel/workqueue.c:3288 [inline]
                        process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3371
                        worker_thread+0xa53/0xfc0 kernel/workqueue.c:3452
                        kthread+0x388/0x470 kernel/kthread.c:436
                        ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
                        ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 }
 ... key      at: [<ffffffff8e40c058>] tasklist_lock+0x18/0x40
 ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
   _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
   send_sigio+0x101/0x370 fs/fcntl.c:932
   dnotify_handle_event+0x169/0x440 fs/notify/dnotify/dnotify.c:113
   fsnotify_handle_event fs/notify/fsnotify.c:327 [inline]
   send_to_group fs/notify/fsnotify.c:375 [inline]
   fsnotify+0x1831/0x1ae0 fs/notify/fsnotify.c:592
   fsnotify_name include/linux/fsnotify.h:55 [inline]
   fsnotify_dirent include/linux/fsnotify.h:61 [inline]
   fsnotify_create include/linux/fsnotify.h:323 [inline]
   open_last_lookups fs/namei.c:4614 [inline]
   path_openat+0x15c2/0x3860 fs/namei.c:4855
   do_file_open+0x23e/0x4a0 fs/namei.c:4887
   do_sys_openat2+0x113/0x200 fs/open.c:1366
   do_sys_open fs/open.c:1372 [inline]
   __do_sys_open fs/open.c:1380 [inline]
   __se_sys_open fs/open.c:1376 [inline]
   __x64_sys_open+0x11e/0x150 fs/open.c:1376
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 27979 Comm: syz.3.5416 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_bad_irq_dependency kernel/locking/lockdep.c:2616 [inline]
 check_irq_usage kernel/locking/lockdep.c:2857 [inline]
 check_prev_add kernel/locking/lockdep.c:3169 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x2a94/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __raw_read_lock include/linux/rwlock_api_smp.h:161 [inline]
 _raw_read_lock+0x36/0x50 kernel/locking/spinlock.c:228
 send_sigio+0x101/0x370 fs/fcntl.c:932
 dnotify_handle_event+0x169/0x440 fs/notify/dnotify/dnotify.c:113
 fsnotify_handle_event fs/notify/fsnotify.c:327 [inline]
 send_to_group fs/notify/fsnotify.c:375 [inline]
 fsnotify+0x1831/0x1ae0 fs/notify/fsnotify.c:592
 fsnotify_name include/linux/fsnotify.h:55 [inline]
 fsnotify_dirent include/linux/fsnotify.h:61 [inline]
 fsnotify_create include/linux/fsnotify.h:323 [inline]
 open_last_lookups fs/namei.c:4614 [inline]
 path_openat+0x15c2/0x3860 fs/namei.c:4855
 do_file_open+0x23e/0x4a0 fs/namei.c:4887
 do_sys_openat2+0x113/0x200 fs/open.c:1366
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_open fs/open.c:1380 [inline]
 __se_sys_open fs/open.c:1376 [inline]
 __x64_sys_open+0x11e/0x150 fs/open.c:1376
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2207b9c819
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:00007f2208b34028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f2207e15fa0 RCX: 00007f2207b9c819
RDX: 0000000000000000 RSI: 000000000004e142 RDI: 0000200000000040
RBP: 00007f2207c32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2207e16038 R14: 00007f2207e15fa0 R15: 00007f2207f3fa48
 </TASK>