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Not in threaded context on PREEMPT_RT as expected
WARNING: kernel/sched/completion.c:76 at complete_all+0x174/0x218 kernel/sched/completion.c:76, CPU#1: syz-executor/4675
Modules linked in:
CPU: 1 UID: 0 PID: 4675 Comm: syz-executor Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : complete_all+0x174/0x218 kernel/sched/completion.c:76
lr : complete_all+0x174/0x218 kernel/sched/completion.c:76
sp : ffff800097ce7840
x29: ffff800097ce7840 x28: dfff800000000000 x27: 1fffe0001a90bae5
x26: ffff700012f9cf20 x25: 1fffe00019debac7 x24: dfff800000000000
x23: ffff0000c3054800 x22: dfff800000000000 x21: ffff0000d485d700
x20: ffff0000d485e218 x19: ffff0000cef5d698 x18: 1fffe00035c20e20
x17: 00000000ffff0000 x16: ffff000000000000 x15: 0000000000000000
x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000c43 x10: 0000000000ff0100 x9 : 1249b96eede36e00
x8 : 1249b96eede36e00 x7 : ffff8000804886d0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f13b0
x2 : 0000000100000000 x1 : ffff0000d485d700 x0 : 0000000000000000
Call trace:
 complete_all+0x174/0x218 kernel/sched/completion.c:76 (P)
 device_pm_remove+0x74/0x29c drivers/base/power/main.c:172
 device_del+0x3f8/0x710 drivers/base/core.c:3896
 hci_unregister_dev+0x328/0x49c net/bluetooth/hci_core.c:2737
 vhci_release+0x12c/0x17c drivers/bluetooth/hci_vhci.c:690
 __fput+0x340/0x744 fs/file_table.c:510
 ____fput+0x20/0x30 fs/file_table.c:538
 task_work_run+0x1c4/0x254 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x580/0x1a6c kernel/exit.c:975
 do_group_exit+0x194/0x22c kernel/exit.c:1117
 __do_sys_exit_group kernel/exit.c:1128 [inline]
 __se_sys_exit_group kernel/exit.c:1126 [inline]
 pid_child_should_wake+0x0/0x110 kernel/exit.c:1126
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 243142
hardirqs last  enabled at (243141): [<ffff8000867248cc>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline]
hardirqs last  enabled at (243141): [<ffff8000867248cc>] arm64_exit_to_kernel_mode+0x7c/0x90 arch/arm64/kernel/entry-common.c:62
hardirqs last disabled at (243142): [<ffff800086720a28>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412
softirqs last  enabled at (243014): [<ffff800084ab928c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (243012): [<ffff800084ab9258>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---