watchdog: BUG: soft lockup - CPU#0 stuck for 40s! [kworker/u8:7:1306]
Modules linked in:
irq event stamp: 898250
hardirqs last  enabled at (898249): [<ffff8000858e5a34>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline]
hardirqs last  enabled at (898249): [<ffff8000858e5a34>] _raw_spin_unlock_irq+0x30/0x8c kernel/locking/spinlock.c:206
hardirqs last disabled at (898250): [<ffff8000858bcfa8>] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline]
hardirqs last disabled at (898250): [<ffff8000858bcfa8>] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522
softirqs last  enabled at (898174): [<ffff800084973a0c>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (898174): [<ffff800084973a0c>] neigh_managed_work+0x168/0x1cc net/core/neighbour.c:1669
softirqs last disabled at (898170): [<ffff8000849738d4>] spin_lock_bh include/linux/spinlock.h:348 [inline]
softirqs last disabled at (898170): [<ffff8000849738d4>] neigh_managed_work+0x30/0x1cc net/core/neighbour.c:1664
CPU: 0 UID: 0 PID: 1306 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
Workqueue: events_unbound flush_memcg_stats_dwork
pstate: 10000005 (nzcV daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
pc : _raw_spin_unlock_irq+0x34/0x8c kernel/locking/spinlock.c:206
lr : __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline]
lr : _raw_spin_unlock_irq+0x30/0x8c kernel/locking/spinlock.c:206
sp : ffff80008f4c7b30
x29: ffff80008f4c7b30 x28: 0000000000000000 x27: 0000000002000000
x26: ffff000017126f00 x25: 0000000002000010 x24: ffff80008766a000
x23: ffff0000171d9d00 x22: ffff800087a56020 x21: ffff80008766ac00
x20: ffff00000e06b000 x19: ffff00000e06b000 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: ffff80008766b708
x14: 1ffff00010ecd6e1 x13: ffff7fffe499c000 x12: ffff600001c0d601
x11: 1fffe00001c0d600 x10: ffff600001c0d600 x9 : dfff800000000000
x8 : ffff80008f4c79c0 x7 : ffff80008f4c7b40 x6 : ffff80008f4c7ae0
x5 : ffff80008f4c7a20 x4 : 0000000000000000 x3 : 1fffe00002e3b3a1
x2 : 0000000000000001 x1 : ffff800087612ec8 x0 : 00000000000db4c9
Call trace:
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P)
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P)
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline] (P)
 _raw_spin_unlock_irq+0x34/0x8c kernel/locking/spinlock.c:206 (P)
 process_one_work+0x678/0x1ab0 kernel/workqueue.c:3291
 process_scheduled_works kernel/workqueue.c:3405 [inline]
 worker_thread+0x42c/0xc90 kernel/workqueue.c:3486
 kthread+0x2ec/0x384 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:858
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle_call+0x98/0x128 kernel/sched/idle.c:129