syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/0:4:4342]
Modules linked in:
irq event stamp: 43313
hardirqs last  enabled at (43312): [<ffff80001191e9a4>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (43312): [<ffff80001191e9a4>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (43313): [<ffff80001191ca20>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (43313): [<ffff80001191ca20>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (38588): [<ffff8000106051b0>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (38588): [<ffff8000106051b0>] clusterip_netdev_event+0x384/0x3ac net/ipv4/netfilter/ipt_CLUSTERIP.c:233
softirqs last disabled at (38590): [<ffff80000fe8beec>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 0 PID: 4342 Comm: kworker/0:4 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events ser_release
pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x138/0xc08 kernel/locking/qspinlock.c:383
lr : queued_spin_lock_slowpath+0x144/0xc08 kernel/locking/qspinlock.c:383
sp : ffff800020ba7580
x29: ffff800020ba7620 x28: ffff800014fc3008 x27: 1fffe0001e8cfc99
x26: 0000000000000001 x25: ffff0000d8db9bc0 x24: dfff800000000000
x23: ffff700004174eb4 x22: 1ffff00004174ed4 x21: ffff0000f467e4c8
x20: ffff0000f467e4d0 x19: ffff0000f467e4c0 x18: ffff800011a7bce0
x17: ffff8000181a1000 x16: ffff8000082e6f68 x15: ffff800017c81fc0
x14: ffff0000d8dba658 x13: ffff0000d8dba6f8 x12: 0000000000000001
x11: 1fffe0001e8cfc98 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000101 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff8000183a5fc8 x4 : 0000000000000008 x3 : ffff800011a08ce4
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:252 [inline]
 __cmpwait arch/arm64/include/asm/cmpxchg.h:278 [inline]
 queued_spin_lock_slowpath+0x138/0xc08 kernel/locking/qspinlock.c:383
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x2e8/0x2ec kernel/locking/spinlock_debug.c:115
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0x5c/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 __netif_tx_lock include/linux/netdevice.h:4347 [inline]
 netif_freeze_queues net/sched/sch_generic.c:459 [inline]
 netif_tx_lock+0x9c/0x1d8 net/sched/sch_generic.c:468
 netif_tx_lock_bh include/linux/netdevice.h:4431 [inline]
 dev_watchdog_down net/sched/sch_generic.c:573 [inline]
 dev_deactivate_many+0x270/0xa8c net/sched/sch_generic.c:1362
 __dev_close_many+0x23c/0x394 net/core/dev.c:1559
 dev_close_many+0x1e8/0x440 net/core/dev.c:1597
 dev_close+0x148/0x1f8 net/core/dev.c:1623
 ser_release+0x150/0x1ec drivers/net/caif/caif_serial.c:309
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864