=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 Not tainted
-----------------------------------------------------
syz.0.3171/14585 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8de0c058 (tasklist_lock){.+.+}-{3:3}, at: send_sigurg+0x12b/0x420

and this task is already holding:
ffff8881072498a0 (&f_owner->lock){....}-{3:3}, at: send_sigurg+0x55/0x420
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+0x120/0x360
  _raw_spin_lock+0x2e/0x40
  evdev_pass_values+0xb9/0xbd0
  evdev_events+0x1e6/0x340
  input_pass_values+0x288/0x890
  input_event_dispose+0x3e5/0x6b0
  input_event+0x89/0xe0
  hidinput_hid_event+0x132c/0x1c90
  hid_process_event+0x4be/0x620
  hid_report_raw_event+0xe91/0x16d0
  hid_input_report+0x43e/0x520
  hid_irq_in+0x47e/0x6d0
  __usb_hcd_giveback_urb+0x41a/0x690
  dummy_timer+0x862/0x4550
  __hrtimer_run_queues+0x52c/0xc60
  hrtimer_run_softirq+0x187/0x2b0
  handle_softirqs+0x286/0x870
  __irq_exit_rcu+0xca/0x1f0
  irq_exit_rcu+0x9/0x30
  sysvec_apic_timer_interrupt+0xa6/0xc0
  asm_sysvec_apic_timer_interrupt+0x1a/0x20
  preempt_schedule_irq+0xb0/0x150
  irqentry_exit+0x6f/0x90
  asm_sysvec_call_function_single+0x1a/0x20
  lock_release+0x2b5/0x3e0
  batadv_nc_worker+0x28c/0x610
  process_scheduled_works+0xae1/0x17b0
  worker_thread+0x8a0/0xda0
  kthread+0x711/0x8a0
  ret_from_fork+0x3fc/0x770
  ret_from_fork_asm+0x1a/0x30

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x120/0x360
  _raw_read_lock+0x36/0x50
  __do_wait+0xde/0x740
  do_wait+0x1f8/0x520
  kernel_wait+0xab/0x170
  call_usermodehelper_exec_work+0xbe/0x230
  process_scheduled_works+0xae1/0x17b0
  worker_thread+0x8a0/0xda0
  kthread+0x711/0x8a0
  ret_from_fork+0x3fc/0x770
  ret_from_fork_asm+0x1a/0x30

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 ***

2 locks held by syz.0.3171/14585:
 #0: ffff888037068258 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x21/0x50
 #1: ffff8881072498a0 (&f_owner->lock){....}-{3:3}, at: send_sigurg+0x55/0x420

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&client->buffer_lock){..-.}-{3:3} {
     IN-SOFTIRQ-W at:
                        lock_acquire+0x120/0x360
                        _raw_spin_lock+0x2e/0x40
                        evdev_pass_values+0xb9/0xbd0
                        evdev_events+0x1e6/0x340
                        input_pass_values+0x288/0x890
                        input_event_dispose+0x3e5/0x6b0
                        input_event+0x89/0xe0
                        hidinput_hid_event+0x132c/0x1c90
                        hid_process_event+0x4be/0x620
                        hid_report_raw_event+0xe91/0x16d0
                        hid_input_report+0x43e/0x520
                        hid_irq_in+0x47e/0x6d0
                        __usb_hcd_giveback_urb+0x41a/0x690
                        dummy_timer+0x862/0x4550
                        __hrtimer_run_queues+0x52c/0xc60
                        hrtimer_run_softirq+0x187/0x2b0
                        handle_softirqs+0x286/0x870
                        __irq_exit_rcu+0xca/0x1f0
                        irq_exit_rcu+0x9/0x30
                        sysvec_apic_timer_interrupt+0xa6/0xc0
                        asm_sysvec_apic_timer_interrupt+0x1a/0x20
                        preempt_schedule_irq+0xb0/0x150
                        irqentry_exit+0x6f/0x90
                        asm_sysvec_call_function_single+0x1a/0x20
                        lock_release+0x2b5/0x3e0
                        batadv_nc_worker+0x28c/0x610
                        process_scheduled_works+0xae1/0x17b0
                        worker_thread+0x8a0/0xda0
                        kthread+0x711/0x8a0
                        ret_from_fork+0x3fc/0x770
                        ret_from_fork_asm+0x1a/0x30
     INITIAL USE at:
                       lock_acquire+0x120/0x360
                       _raw_spin_lock+0x2e/0x40
                       evdev_handle_get_val+0x70/0x9f0
                       evdev_ioctl_handler+0x1202/0x1f10
                       __se_sys_ioctl+0xfc/0x170
                       do_syscall_64+0xfa/0x3b0
                       entry_SYSCALL_64_after_hwframe+0x77/0x7f
   }
   ... key      at: [<ffffffff99e22300>] evdev_open.__key.25+0x0/0x20
 -> (&new->fa_lock){....}-{3:3} {
    INITIAL USE at:
                     lock_acquire+0x120/0x360
                     _raw_write_lock_irq+0xa2/0xf0
                     fasync_remove_entry+0xf1/0x1c0
                     lease_modify+0x1ca/0x3c0
                     locks_remove_file+0x4bf/0xea0
                     __fput+0x3ab/0xa70
                     task_work_run+0x1d4/0x260
                     exit_to_user_mode_loop+0xec/0x110
                     do_syscall_64+0x2bd/0x3b0
                     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    INITIAL READ USE at:
                          lock_acquire+0x120/0x360
                          _raw_read_lock_irqsave+0xaf/0x100
                          kill_fasync+0x199/0x4d0
                          lease_break_callback+0x26/0x30
                          __break_lease+0x6a5/0x1620
                          do_dentry_open+0x8b7/0x13f0
                          vfs_open+0x3b/0x340
                          path_openat+0x2ee5/0x3830
                          do_filp_open+0x1fa/0x410
                          do_sys_openat2+0x121/0x1c0
                          __x64_sys_openat+0x138/0x170
                          do_syscall_64+0xfa/0x3b0
                          entry_SYSCALL_64_after_hwframe+0x77/0x7f
  }
  ... key      at: [<ffffffff99b22f80>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock_irqsave+0xaf/0x100
   kill_fasync+0x199/0x4d0
   evdev_pass_values+0x627/0xbd0
   evdev_events+0x1e6/0x340
   input_pass_values+0x288/0x890
   input_event_dispose+0x330/0x6b0
   input_inject_event+0x1dd/0x340
   evdev_write+0x2fc/0x480
   vfs_write+0x27e/0xa90
   ksys_write+0x145/0x250
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> (&f_owner->lock){....}-{3:3} {
   INITIAL USE at:
                   lock_acquire+0x120/0x360
                   _raw_write_lock_irq+0xa2/0xf0
                   __f_setown+0x67/0x370
                   generic_setlease+0xd60/0x1240
                   fcntl_setlease+0x3a2/0x4c0
                   do_fcntl+0x6a9/0x1910
                   __se_sys_fcntl+0xc8/0x150
                   do_syscall_64+0xfa/0x3b0
                   entry_SYSCALL_64_after_hwframe+0x77/0x7f
   INITIAL READ USE at:
                        lock_acquire+0x120/0x360
                        _raw_read_lock_irqsave+0xaf/0x100
                        send_sigio+0x38/0x370
                        kill_fasync+0x24d/0x4d0
                        lease_break_callback+0x26/0x30
                        __break_lease+0x6a5/0x1620
                        do_dentry_open+0x8b7/0x13f0
                        vfs_open+0x3b/0x340
                        path_openat+0x2ee5/0x3830
                        do_filp_open+0x1fa/0x410
                        do_sys_openat2+0x121/0x1c0
                        __x64_sys_openat+0x138/0x170
                        do_syscall_64+0xfa/0x3b0
                        entry_SYSCALL_64_after_hwframe+0x77/0x7f
 }
 ... key      at: [<ffffffff99b22f60>] file_f_owner_allocate.__key+0x0/0x20
 ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock_irqsave+0xaf/0x100
   send_sigio+0x38/0x370
   kill_fasync+0x24d/0x4d0
   lease_break_callback+0x26/0x30
   __break_lease+0x6a5/0x1620
   do_dentry_open+0x8b7/0x13f0
   vfs_open+0x3b/0x340
   path_openat+0x2ee5/0x3830
   do_filp_open+0x1fa/0x410
   do_sys_openat2+0x121/0x1c0
   __x64_sys_openat+0x138/0x170
   do_syscall_64+0xfa/0x3b0
   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+0x120/0x360
                    _raw_read_lock+0x36/0x50
                    __do_wait+0xde/0x740
                    do_wait+0x1f8/0x520
                    kernel_wait+0xab/0x170
                    call_usermodehelper_exec_work+0xbe/0x230
                    process_scheduled_works+0xae1/0x17b0
                    worker_thread+0x8a0/0xda0
                    kthread+0x711/0x8a0
                    ret_from_fork+0x3fc/0x770
                    ret_from_fork_asm+0x1a/0x30
   SOFTIRQ-ON-R at:
                    lock_acquire+0x120/0x360
                    _raw_read_lock+0x36/0x50
                    __do_wait+0xde/0x740
                    do_wait+0x1f8/0x520
                    kernel_wait+0xab/0x170
                    call_usermodehelper_exec_work+0xbe/0x230
                    process_scheduled_works+0xae1/0x17b0
                    worker_thread+0x8a0/0xda0
                    kthread+0x711/0x8a0
                    ret_from_fork+0x3fc/0x770
                    ret_from_fork_asm+0x1a/0x30
   INITIAL USE at:
                   lock_acquire+0x120/0x360
                   _raw_write_lock_irq+0xa2/0xf0
                   copy_process+0x224f/0x3c00
                   kernel_clone+0x21e/0x840
                   user_mode_thread+0xdd/0x140
                   rest_init+0x23/0x300
                   start_kernel+0x3a9/0x410
                   x86_64_start_reservations+0x24/0x30
                   x86_64_start_kernel+0x143/0x1c0
                   common_startup_64+0x13e/0x147
   INITIAL READ USE at:
                        lock_acquire+0x120/0x360
                        _raw_read_lock+0x36/0x50
                        __do_wait+0xde/0x740
                        do_wait+0x1f8/0x520
                        kernel_wait+0xab/0x170
                        call_usermodehelper_exec_work+0xbe/0x230
                        process_scheduled_works+0xae1/0x17b0
                        worker_thread+0x8a0/0xda0
                        kthread+0x711/0x8a0
                        ret_from_fork+0x3fc/0x770
                        ret_from_fork_asm+0x1a/0x30
 }
 ... key      at: [<ffffffff8de0c058>] tasklist_lock+0x18/0x40
 ... acquired at:
   lock_acquire+0x120/0x360
   _raw_read_lock+0x36/0x50
   send_sigurg+0x12b/0x420
   sk_send_sigurg+0x6c/0x2e0
   tcp_check_urg+0x200/0x760
   tcp_urg+0x164/0x3f0
   tcp_rcv_established+0xf93/0x1eb0
   tcp_v4_do_rcv+0xa23/0xce0
   __release_sock+0x21c/0x350
   release_sock+0x5f/0x1f0
   tcp_sendmsg+0x39/0x50
   __sock_sendmsg+0x19c/0x270
   __sys_sendto+0x3bd/0x520
   __x64_sys_sendto+0xde/0x100
   do_syscall_64+0xfa/0x3b0
   entry_SYSCALL_64_after_hwframe+0x77/0x7f


stack backtrace:
CPU: 1 UID: 0 PID: 14585 Comm: syz.0.3171 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 validate_chain+0x1f05/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 _raw_read_lock+0x36/0x50
 send_sigurg+0x12b/0x420
 sk_send_sigurg+0x6c/0x2e0
 tcp_check_urg+0x200/0x760
 tcp_urg+0x164/0x3f0
 tcp_rcv_established+0xf93/0x1eb0
 tcp_v4_do_rcv+0xa23/0xce0
 __release_sock+0x21c/0x350
 release_sock+0x5f/0x1f0
 tcp_sendmsg+0x39/0x50
 __sock_sendmsg+0x19c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fac38f8ebe9
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:00007fac39e59038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fac391b5fa0 RCX: 00007fac38f8ebe9
RDX: 0000000000000001 RSI: 00002000000004c0 RDI: 0000000000000003
RBP: 00007fac39011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000885 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fac391b6038 R14: 00007fac391b5fa0 R15: 00007ffd588b9608
 </TASK>
