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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.2.678/7888
Modules linked in:
CPU: 1 UID: 0 PID: 7888 Comm: syz.2.678 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
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 : ffff800093ff73a0
x29: ffff800093ff73a0 x28: ffff800093ff74e0 x27: dfff800000000000
x26: ffff7000127fee9c x25: 1fffe0001bc1c401 x24: ffff0000de0e20b6
x23: ffff0000de0e2ab0 x22: dfff800000000000 x21: ffff0000d6920000
x20: ffff0000d6920b18 x19: ffff0000de0e28f8 x18: 000000001f6d6852
x17: 00000000305164ad x16: dfff800000000000 x15: 00000000b19c8ad0
x14: 0000000080166ec8 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000080000 x9 : 8ad15e3ddb31b800
x8 : 8ad15e3ddb31b800 x7 : ffff80008048076c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f45e0
x2 : 0000000100000000 x1 : ffff0000d6920000 x0 : 0000000000000001
Call trace:
 complete_all+0x174/0x218 kernel/sched/completion.c:76 (P)
 device_pm_sleep_init+0x84/0x114 drivers/base/power/main.c:118
 device_pm_init drivers/base/power/power.h:168 [inline]
 device_initialize+0x1f8/0x440 drivers/base/core.c:3167
 netdev_register_kobject+0x34/0x2f4 net/core/net-sysfs.c:2324
 register_netdevice+0xd74/0x14b8 net/core/dev.c:11423
 register_netdev+0x4c/0x68 net/core/dev.c:11539
 vti6_init_net+0x204/0x334 net/ipv6/ip6_vti.c:1167
 ops_init+0x2cc/0x528 net/core/net_namespace.c:137
 setup_net+0x118/0x2fc net/core/net_namespace.c:446
 copy_net_ns+0x458/0x66c net/core/net_namespace.c:579
 create_new_namespaces+0x304/0x50c kernel/nsproxy.c:132
 copy_namespaces+0x3fc/0x474 kernel/nsproxy.c:195
 copy_process+0x171c/0x337c kernel/fork.c:2267
 kernel_clone+0x234/0x9fc kernel/fork.c:2722
 __do_sys_clone kernel/fork.c:2863 [inline]
 __se_sys_clone kernel/fork.c:2831 [inline]
 __arm64_sys_clone+0x160/0x1cc kernel/fork.c:2831
 __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:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 10132
hardirqs last  enabled at (10131): [<ffff800086832420>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (10131): [<ffff800086832420>] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62
hardirqs last disabled at (10132): [<ffff80008682e34c>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425
softirqs last  enabled at (10056): [<ffff800084b910c4>] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:696
softirqs last disabled at (10054): [<ffff800084b910ac>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (10054): [<ffff800084b910ac>] __alloc_skb+0x1a8/0x610 net/core/skbuff.c:695
---[ end trace 0000000000000000 ]---