watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [kworker/u4:2:148]
Modules linked in:
irq event stamp: 7053485
hardirqs last  enabled at (7053483): [<ffff8000081b4dac>] __local_bh_enable_ip+0x258/0x4d0 kernel/softirq.c:388
hardirqs last disabled at (7053485): [<ffff80001194f688>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (7053482): [<ffff80001174ffe4>] spin_unlock_bh include/linux/spinlock.h:408 [inline]
softirqs last  enabled at (7053482): [<ffff80001174ffe4>] __batadv_dat_purge+0x2d4/0x374 net/batman-adv/distributed-arp-table.c:187
softirqs last disabled at (7053484): [<ffff80001174fe08>] spin_lock_bh include/linux/spinlock.h:368 [inline]
softirqs last disabled at (7053484): [<ffff80001174fe08>] __batadv_dat_purge+0xf8/0x374 net/batman-adv/distributed-arp-table.c:175
CPU: 0 PID: 148 Comm: kworker/u4:2 Not tainted 5.15.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: bat_events batadv_dat_purge
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : lock_acquire+0x280/0x77c
lr : lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
lr : lock_acquire+0x24c/0x77c kernel/locking/lockdep.c:5624
sp : ffff80001a3c7920
x29: ffff80001a3c7a10 x28: ffff700003478f2c x27: 0000000000000000
x26: ffff0001b47fbd00 x25: ffff0001257be1d8 x24: 0000000000000000
x23: 0000000100000201 x22: ffff0000c5429b40 x21: ffff800014830d00
x20: dfff800000000000 x19: ffff0001b47fbd00 x18: 0000000000000000
x17: ff8080000fd27aa0 x16: ffff80001195113c x15: ffff80000fd27aa0
x14: 1ffff0000291c06a x13: ffffffffffffffff x12: 0000000000000000
x11: ff8080000a9a3a24 x10: 0000000000000003 x9 : 0000000000000080
x8 : 00000000000000c0 x7 : ffff80001174fe08 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000008 x1 : ffff800011aabf00 x0 : 0000000000000000
Call trace:
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 lock_acquire+0x280/0x77c kernel/locking/lockdep.c:5625
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x124/0x1c4 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:368 [inline]
 __batadv_dat_purge+0xf8/0x374 net/batman-adv/distributed-arp-table.c:175
 batadv_dat_purge+0x34/0x154 net/batman-adv/distributed-arp-table.c:206
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
 worker_thread+0x910/0x1034 kernel/workqueue.c:2454
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870