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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.5.146/5537
Modules linked in:
CPU: 1 UID: 0 PID: 5537 Comm: syz.5.146 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
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 : ffff800096ab7550
x29: ffff800096ab7550 x28: 0000000000000001 x27: 1fffe0001e7b8521
x26: ffff0000f3dc2908 x25: ffff0000f4a10400 x24: 0000000000000000
x23: 0000000000000000 x22: dfff800000000000 x21: ffff0000c5010000
x20: ffff0000c5010b30 x19: ffff0000f4a104c0 x18: 1fffe00035b9ec28
x17: ffff800125154000 x16: ffff80008ec30000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000003
x11: 0000000000000000 x10: 0000000000080000 x9 : bba5b54f5afca200
x8 : bba5b54f5afca200 x7 : ffff80008048e314 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f9194
x2 : 0000000100000000 x1 : ffff0000c5010000 x0 : 0000000000000001
Call trace:
 complete_all+0x174/0x218 kernel/sched/completion.c:76 (P)
 drm_atomic_helper_commit_cleanup_done+0x124/0x324 drivers/gpu/drm/drm_atomic_helper.c:2792
 commit_tail+0x2d8/0x3a8 drivers/gpu/drm/drm_atomic_helper.c:2088
 drm_atomic_helper_commit+0x26c/0x280 drivers/gpu/drm/drm_atomic_helper.c:2318
 drm_atomic_commit+0x214/0x280 drivers/gpu/drm/drm_atomic.c:1869
 drm_mode_atomic_ioctl+0xf94/0x1e78 drivers/gpu/drm/drm_atomic_uapi.c:1764
 drm_ioctl_kernel+0x250/0x31c drivers/gpu/drm/drm_ioctl.c:817
 drm_ioctl+0x694/0xac8 drivers/gpu/drm/drm_ioctl.c:914
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
irq event stamp: 944
hardirqs last  enabled at (943): [<ffff8000804918ac>] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385
hardirqs last disabled at (944): [<ffff8000869841d4>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445
softirqs last  enabled at (842): [<ffff80008013b050>] local_bh_enable include/linux/bottom_half.h:33 [inline]
softirqs last  enabled at (842): [<ffff80008013b050>] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline]
softirqs last  enabled at (842): [<ffff80008013b050>] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797
softirqs last disabled at (840): [<ffff80008013acf8>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (840): [<ffff80008013acf8>] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline]
softirqs last disabled at (840): [<ffff80008013acf8>] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790
---[ end trace 0000000000000000 ]---