syzbot

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
syzkaller #0 Not tainted
-----------------------------------------------------
syz.0.2313/11341 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8c00a058 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xd2/0x330 fs/fcntl.c:804

and this task is already holding:
ffff88807bff3038 (&f->f_owner.lock){....}-{2:2}, at: send_sigio+0x2f/0x330 fs/fcntl.c:790
which would create a new lock dependency:
 (&f->f_owner.lock){....}-{2:2} -> (tasklist_lock){.+.+}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&client->buffer_lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:364 [inline]
  evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
  evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
  input_to_handler drivers/input/input.c:126 [inline]
  input_pass_values+0x87e/0x1210 drivers/input/input.c:156
  input_handle_event+0xbe0/0x1490 drivers/input/input.c:426
  input_event+0x88/0xb0 drivers/input/input.c:457
  hidinput_hid_event+0x1184/0x19a0 drivers/hid/hid-input.c:1483
  hid_process_event+0x4b7/0x620 drivers/hid/hid-core.c:1545
  hid_input_field drivers/hid/hid-core.c:1589 [inline]
  hid_report_raw_event+0xdde/0x1640 drivers/hid/hid-core.c:1822
  hid_input_report+0x424/0x4e0 drivers/hid/hid-core.c:1889
  hid_irq_in+0x435/0x690 drivers/hid/usbhid/hid-core.c:284
  __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1674
  dummy_timer+0x8a8/0x31e0 drivers/usb/gadget/udc/dummy_hcd.c:1988
  call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
  expire_timers kernel/time/timer.c:1699 [inline]
  __run_timers+0x53e/0x800 kernel/time/timer.c:1970
  run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
  handle_softirqs+0x339/0x830 kernel/softirq.c:576
  __do_softirq kernel/softirq.c:610 [inline]
  invoke_softirq kernel/softirq.c:450 [inline]
  __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
  irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
  instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
  sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
  asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
  memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:64
  save_stack+0xaf/0x230 mm/page_owner.c:103
  __reset_page_owner+0x51/0x180 mm/page_owner.c:140
  reset_page_owner include/linux/page_owner.h:24 [inline]
  free_pages_prepare mm/page_alloc.c:1340 [inline]
  free_pcp_prepare mm/page_alloc.c:1391 [inline]
  free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
  free_unref_page_list+0x119/0x820 mm/page_alloc.c:3433
  release_pages+0x186c/0x1be0 mm/swap.c:963
  __pagevec_release+0x6d/0xe0 mm/swap.c:983
  pagevec_release include/linux/pagevec.h:81 [inline]
  shmem_undo_range+0x62b/0x1930 mm/shmem.c:964
  shmem_truncate_range mm/shmem.c:1063 [inline]
  shmem_evict_inode+0x220/0xa40 mm/shmem.c:1145
  evict+0x4c9/0x8d0 fs/inode.c:647
  __dentry_kill+0x431/0x650 fs/dcache.c:586
  dentry_kill+0xb8/0x290 fs/dcache.c:-1
  dput+0xd8/0x1a0 fs/dcache.c:893
  __fput+0x5ee/0x930 fs/file_table.c:319
  task_work_run+0x125/0x1a0 kernel/task_work.c:188
  tracehook_notify_resume include/linux/tracehook.h:189 [inline]
  exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
  exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
  __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
  syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
  do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
  entry_SYSCALL_64_after_hwframe+0x66/0xd0

to a SOFTIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
  _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
  do_wait+0x293/0xac0 kernel/exit.c:1579
  kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
  call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
  call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
  process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
  worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
  kthread+0x436/0x520 kernel/kthread.c:334
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

other info that might help us debug this:

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

 Possible interrupt unsafe locking scenario:

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

 *** DEADLOCK ***

5 locks held by syz.0.2313/11341:
 #0: ffffffff8c437bf0 (file_rwsem){.+.+}-{0:0}, at: __break_lease+0x180/0x12b0 fs/locks.c:1586
 #1: ffff8880253654e8 (&ctx->flc_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:364 [inline]
 #1: ffff8880253654e8 (&ctx->flc_lock){+.+.}-{2:2}, at: __break_lease+0x18d/0x12b0 fs/locks.c:1587
 #2: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312
 #3: ffff888068e2d168 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1008 [inline]
 #3: ffff888068e2d168 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x16d/0x490 fs/fcntl.c:1029
 #4: ffff88807bff3038 (&f->f_owner.lock){....}-{2:2}, at: send_sigio+0x2f/0x330 fs/fcntl.c:790

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&client->buffer_lock){..-.}-{2:2} {
     IN-SOFTIRQ-W at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
                        _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                        spin_lock include/linux/spinlock.h:364 [inline]
                        evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
                        evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
                        input_to_handler drivers/input/input.c:126 [inline]
                        input_pass_values+0x87e/0x1210 drivers/input/input.c:156
                        input_handle_event+0xbe0/0x1490 drivers/input/input.c:426
                        input_event+0x88/0xb0 drivers/input/input.c:457
                        hidinput_hid_event+0x1184/0x19a0 drivers/hid/hid-input.c:1483
                        hid_process_event+0x4b7/0x620 drivers/hid/hid-core.c:1545
                        hid_input_field drivers/hid/hid-core.c:1589 [inline]
                        hid_report_raw_event+0xdde/0x1640 drivers/hid/hid-core.c:1822
                        hid_input_report+0x424/0x4e0 drivers/hid/hid-core.c:1889
                        hid_irq_in+0x435/0x690 drivers/hid/usbhid/hid-core.c:284
                        __usb_hcd_giveback_urb+0x35f/0x520 drivers/usb/core/hcd.c:1674
                        dummy_timer+0x8a8/0x31e0 drivers/usb/gadget/udc/dummy_hcd.c:1988
                        call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
                        expire_timers kernel/time/timer.c:1699 [inline]
                        __run_timers+0x53e/0x800 kernel/time/timer.c:1970
                        run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
                        handle_softirqs+0x339/0x830 kernel/softirq.c:576
                        __do_softirq kernel/softirq.c:610 [inline]
                        invoke_softirq kernel/softirq.c:450 [inline]
                        __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
                        instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
                        sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
                        asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
                        memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:64
                        save_stack+0xaf/0x230 mm/page_owner.c:103
                        __reset_page_owner+0x51/0x180 mm/page_owner.c:140
                        reset_page_owner include/linux/page_owner.h:24 [inline]
                        free_pages_prepare mm/page_alloc.c:1340 [inline]
                        free_pcp_prepare mm/page_alloc.c:1391 [inline]
                        free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
                        free_unref_page_list+0x119/0x820 mm/page_alloc.c:3433
                        release_pages+0x186c/0x1be0 mm/swap.c:963
                        __pagevec_release+0x6d/0xe0 mm/swap.c:983
                        pagevec_release include/linux/pagevec.h:81 [inline]
                        shmem_undo_range+0x62b/0x1930 mm/shmem.c:964
                        shmem_truncate_range mm/shmem.c:1063 [inline]
                        shmem_evict_inode+0x220/0xa40 mm/shmem.c:1145
                        evict+0x4c9/0x8d0 fs/inode.c:647
                        __dentry_kill+0x431/0x650 fs/dcache.c:586
                        dentry_kill+0xb8/0x290 fs/dcache.c:-1
                        dput+0xd8/0x1a0 fs/dcache.c:893
                        __fput+0x5ee/0x930 fs/file_table.c:319
                        task_work_run+0x125/0x1a0 kernel/task_work.c:188
                        tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                        exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
                        exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
                        __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
                        syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
                        do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
                        entry_SYSCALL_64_after_hwframe+0x66/0xd0
     INITIAL USE at:
                       lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
                       _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
                       spin_lock include/linux/spinlock.h:364 [inline]
                       evdev_pass_values+0xcb/0xab0 drivers/input/evdev.c:261
                       evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
                       input_to_handler drivers/input/input.c:126 [inline]
                       input_pass_values+0x87e/0x1210 drivers/input/input.c:156
                       input_handle_event+0xb3f/0x1490 drivers/input/input.c:415
                       input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
                       evdev_write+0x35b/0x490 drivers/input/evdev.c:530
                       vfs_write+0x30b/0xd60 fs/read_write.c:592
                       ksys_write+0x152/0x260 fs/read_write.c:647
                       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                       entry_SYSCALL_64_after_hwframe+0x66/0xd0
   }
   ... key      at: [<ffffffff9663e300>] evdev_open.__key.22+0x0/0x20
 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                     _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                     fasync_remove_entry+0xf0/0x1c0 fs/fcntl.c:885
                     lease_modify+0x1a2/0x390 fs/locks.c:1480
                     locks_remove_lease fs/locks.c:2720 [inline]
                     locks_remove_file+0x52f/0xec0 fs/locks.c:2745
                     __fput+0x18d/0x930 fs/file_table.c:303
                     task_work_run+0x125/0x1a0 kernel/task_work.c:188
                     tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                     exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
                     exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
                     syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
                     do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
                     entry_SYSCALL_64_after_hwframe+0x66/0xd0
    INITIAL READ USE at:
                          lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                          _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:1008 [inline]
                          kill_fasync+0x16d/0x490 fs/fcntl.c:1029
                          wakeup_pipe_readers fs/splice.c:168 [inline]
                          vmsplice_to_pipe fs/splice.c:1290 [inline]
                          __do_sys_vmsplice fs/splice.c:1351 [inline]
                          __se_sys_vmsplice+0xd96/0xdf0 fs/splice.c:1325
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x66/0xd0
  }
  ... key      at: [<ffffffff96342780>] fasync_insert_entry.__key+0x0/0x20
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1008 [inline]
   kill_fasync+0x16d/0x490 fs/fcntl.c:1029
   __pass_event drivers/input/evdev.c:240 [inline]
   evdev_pass_values+0x54b/0xab0 drivers/input/evdev.c:278
   evdev_events+0x1c0/0x2f0 drivers/input/evdev.c:306
   input_to_handler drivers/input/input.c:126 [inline]
   input_pass_values+0x87e/0x1210 drivers/input/input.c:156
   input_handle_event+0xb3f/0x1490 drivers/input/input.c:415
   input_inject_event+0x1b9/0x2c0 drivers/input/input.c:487
   evdev_write+0x35b/0x490 drivers/input/evdev.c:530
   vfs_write+0x30b/0xd60 fs/read_write.c:592
   ksys_write+0x152/0x260 fs/read_write.c:647
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> (&f->f_owner.lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                   __f_setown+0x37/0x330 fs/fcntl.c:91
                   generic_add_lease fs/locks.c:1900 [inline]
                   generic_setlease+0xec1/0x12f0 fs/locks.c:1980
                   vfs_setlease fs/locks.c:2070 [inline]
                   do_fcntl_add_lease fs/locks.c:2091 [inline]
                   fcntl_setlease+0x262/0x330 fs/locks.c:2113
                   do_fcntl+0x11a/0x1360 fs/fcntl.c:413
                   __do_sys_fcntl fs/fcntl.c:466 [inline]
                   __se_sys_fcntl+0xcc/0x190 fs/fcntl.c:451
                   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                   entry_SYSCALL_64_after_hwframe+0x66/0xd0
   INITIAL READ USE at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                        _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
                        send_sigurg+0x25/0x390 fs/fcntl.c:829
                        sk_send_sigurg+0x6b/0xc0 net/core/sock.c:3137
                        queue_oob+0x622/0x800 net/unix/af_unix.c:2016
                        unix_stream_sendmsg+0xb71/0xc90 net/unix/af_unix.c:2116
                        sock_sendmsg_nosec net/socket.c:706 [inline]
                        __sock_sendmsg net/socket.c:718 [inline]
                        ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
                        ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
                        __sys_sendmsg net/socket.c:2528 [inline]
                        __do_sys_sendmsg net/socket.c:2537 [inline]
                        __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x66/0xd0
 }
 ... key      at: [<ffffffff96341b00>] __alloc_file.__key+0x0/0x10
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xb8/0x100 kernel/locking/spinlock.c:236
   send_sigio+0x2f/0x330 fs/fcntl.c:790
   kill_fasync_rcu fs/fcntl.c:1015 [inline]
   kill_fasync+0x20a/0x490 fs/fcntl.c:1029
   wakeup_pipe_readers fs/splice.c:168 [inline]
   vmsplice_to_pipe fs/splice.c:1290 [inline]
   __do_sys_vmsplice fs/splice.c:1351 [inline]
   __se_sys_vmsplice+0xd96/0xdf0 fs/splice.c:1325
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                    __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                    _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                    do_wait+0x293/0xac0 kernel/exit.c:1579
                    kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                    process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                    worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                    kthread+0x436/0x520 kernel/kthread.c:334
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   SOFTIRQ-ON-R at:
                    lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                    __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                    _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                    do_wait+0x293/0xac0 kernel/exit.c:1579
                    kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                    process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                    worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                    kthread+0x436/0x520 kernel/kthread.c:334
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
   INITIAL USE at:
                   lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                   _raw_write_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:316
                   copy_process+0x236f/0x3e20 kernel/fork.c:2412
                   kernel_clone+0x23f/0x990 kernel/fork.c:2679
                   kernel_thread+0xfa/0x160 kernel/fork.c:2731
                   rest_init+0x21/0x330 init/main.c:720
                   start_kernel+0x489/0x540 init/main.c:1154
                   secondary_startup_64_no_verify+0xb1/0xbb
   INITIAL READ USE at:
                        lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x293/0xac0 kernel/exit.c:1579
                        kernel_wait+0xd3/0x1c0 kernel/exit.c:1769
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb5/0x220 kernel/umh.c:166
                        process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
                        worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
                        kthread+0x436/0x520 kernel/kthread.c:334
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 }
 ... key      at: [<ffffffff8c00a058>] tasklist_lock+0x18/0x40
 ... acquired at:
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
   send_sigio+0xd2/0x330 fs/fcntl.c:804
   kill_fasync_rcu fs/fcntl.c:1015 [inline]
   kill_fasync+0x20a/0x490 fs/fcntl.c:1029
   lease_break_callback+0x22/0x30 fs/locks.c:613
   __break_lease+0x4a1/0x12b0 fs/locks.c:1615
   break_lease include/linux/fs.h:2651 [inline]
   do_dentry_open+0x771/0xf80 fs/open.c:817
   do_open fs/namei.c:3616 [inline]
   path_openat+0x26f5/0x2fa0 fs/namei.c:3750
   do_filp_open+0x1e2/0x410 fs/namei.c:3777
   do_sys_openat2+0x150/0x4b0 fs/open.c:1255
   do_sys_open fs/open.c:1271 [inline]
   __do_sys_open fs/open.c:1279 [inline]
   __se_sys_open fs/open.c:1275 [inline]
   __x64_sys_open+0x11b/0x140 fs/open.c:1275
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x66/0xd0


stack backtrace:
CPU: 1 PID: 11341 Comm: syz.0.2313 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2567 [inline]
 check_irq_usage kernel/locking/lockdep.c:2806 [inline]
 check_prev_add kernel/locking/lockdep.c:3057 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x6688/0x7d10 kernel/locking/lockdep.c:5012
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
 _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
 send_sigio+0xd2/0x330 fs/fcntl.c:804
 kill_fasync_rcu fs/fcntl.c:1015 [inline]
 kill_fasync+0x20a/0x490 fs/fcntl.c:1029
 lease_break_callback+0x22/0x30 fs/locks.c:613
 __break_lease+0x4a1/0x12b0 fs/locks.c:1615
 break_lease include/linux/fs.h:2651 [inline]
 do_dentry_open+0x771/0xf80 fs/open.c:817
 do_open fs/namei.c:3616 [inline]
 path_openat+0x26f5/0x2fa0 fs/namei.c:3750
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x150/0x4b0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_open fs/open.c:1279 [inline]
 __se_sys_open fs/open.c:1275 [inline]
 __x64_sys_open+0x11b/0x140 fs/open.c:1275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f975a26c799
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:00007f97584c6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f975a4e5fa0 RCX: 00007f975a26c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f975a302bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f975a4e6038 R14: 00007f975a4e5fa0 R15: 00007ffcf1a749c8
 </TASK>