[syzbot] WARNING in blocking_notifier_chain_register

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    a41a877bc12d Merge branch 'for-next/fixes' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=16517dad080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c
dashboard link: https://syzkaller.appspot.com/bug?extid=737584027829ab465c9f
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10dc7ac7080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13525513080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+737584027829ab465c9f@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
notifier callback hci_suspend_notifier already registered
WARNING: CPU: 0 PID: 7032 at kernel/notifier.c:29 notifier_chain_register kernel/notifier.c:28 [inline]
WARNING: CPU: 0 PID: 7032 at kernel/notifier.c:29 __blocking_notifier_chain_register kernel/notifier.c:266 [inline]
WARNING: CPU: 0 PID: 7032 at kernel/notifier.c:29 blocking_notifier_chain_register+0xa4/0x188 kernel/notifier.c:284
Modules linked in:
CPU: 0 PID: 7032 Comm: syz-executor176 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : notifier_chain_register kernel/notifier.c:28 [inline]
pc : __blocking_notifier_chain_register kernel/notifier.c:266 [inline]
pc : blocking_notifier_chain_register+0xa4/0x188 kernel/notifier.c:284
lr : notifier_chain_register kernel/notifier.c:28 [inline]
lr : __blocking_notifier_chain_register kernel/notifier.c:266 [inline]
lr : blocking_notifier_chain_register+0xa4/0x188 kernel/notifier.c:284
sp : ffff800014c83c70
x29: ffff800014c83c70 x28: 00000000002e0003 x27: 0000000000000000
x26: ffff0000ca608ea0 x25: 0000000000000000 x24: ffff0000cb0a1108
x23: ffff0000c9313110 x22: 0000000000000000 x21: ffff0000cb0a1108
x20: ffff0000cb0a1108 x19: ffff80000d3c1040 x18: 0000000000000169
x17: ffff80000c04d6bc x16: ffff80000dbb8658 x15: ffff0000c10f8000
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c10f8000
x11: ff808000081c39dc x10: 0000000000000000 x9 : 98b98071cf41c600
x8 : 98b98071cf41c600 x7 : ffff800008197c8c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000039
Call trace:
 notifier_chain_register kernel/notifier.c:28 [inline]
 __blocking_notifier_chain_register kernel/notifier.c:266 [inline]
 blocking_notifier_chain_register+0xa4/0x188 kernel/notifier.c:284
 register_pm_notifier+0x28/0x38 kernel/power/main.c:73
 hci_register_suspend_notifier+0x48/0x64 net/bluetooth/hci_core.c:2749
 hci_sock_release+0x1a8/0x360 net/bluetooth/hci_sock.c:890
 __sock_release net/socket.c:650 [inline]
 sock_close+0x50/0xf0 net/socket.c:1365
 __fput+0x198/0x3bc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:353
 task_work_run+0xc4/0x208 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x174/0x1d0 arch/arm64/kernel/signal.c:1127
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:625
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642
 el0t_64_sync+0x18c/0x190
irq event stamp: 1032
hardirqs last  enabled at (1031): [<ffff8000081c1c48>] __up_console_sem+0xb0/0xfc kernel/printk/printk.c:264
hardirqs last disabled at (1032): [<ffff80000bffe9cc>] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:395
softirqs last  enabled at (1006): [<ffff8000080102e4>] _stext+0x2e4/0x37c
softirqs last disabled at (985): [<ffff800008104658>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (985): [<ffff800008104658>] invoke_softirq+0x70/0xbc kernel/softirq.c:452
---[ end trace 0000000000000000 ]---


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