syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [kworker/u4:14:5103]
Modules linked in:
irq event stamp: 110193651
hardirqs last  enabled at (110193650): [<ffff800011a3a728>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (110193650): [<ffff800011a3a728>] _raw_spin_unlock_irqrestore+0xac/0x158 kernel/locking/spinlock.c:194
hardirqs last disabled at (110193651): [<ffff8000119630b8>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (98765510): [<ffff8000117bae5c>] spin_unlock_bh include/linux/spinlock.h:408 [inline]
softirqs last  enabled at (98765510): [<ffff8000117bae5c>] batadv_tt_global_purge net/batman-adv/translation-table.c:2299 [inline]
softirqs last  enabled at (98765510): [<ffff8000117bae5c>] batadv_tt_purge+0x350/0x810 net/batman-adv/translation-table.c:3561
softirqs last disabled at (98765513): [<ffff8000081b56a0>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (98765513): [<ffff8000081b56a0>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (98765513): [<ffff8000081b56a0>] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:637
CPU: 1 PID: 5103 Comm: kworker/u4:14 Not tainted 5.15.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: bat_events batadv_tt_purge
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
pc : _raw_spin_unlock_irqrestore+0xbc/0x158 kernel/locking/spinlock.c:194
lr : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
lr : _raw_spin_unlock_irqrestore+0xac/0x158 kernel/locking/spinlock.c:194
sp : ffff800008017940
x29: ffff800008017950 x28: 0000000100027a82 x27: 1ffff00001002f48
x26: 0000000000000000 x25: dfff800000000000 x24: dfff800000000000
x23: ffff0001b4818480 x22: ffff8000083b7098 x21: ffff0001b4818498
x20: ffff0001b4818480 x19: 0000000000000000 x18: 0000000000000101
x17: ff8080000ff59a20 x16: ffff8000082ea5b0 x15: ffff80000ff59a20
x14: 1ffff0000292006a x13: ffffffffffffffff x12: 0000000000000100
x11: ff8080000a9a72c4 x10: 0000000000000003 x9 : 0000000000000080
x8 : 00000000000000c0 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff800008045860
x2 : 0000000000000002 x1 : ffff800011abac40 x0 : ffff80019ffc7000
Call trace:
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irqrestore+0xbc/0x158 kernel/locking/spinlock.c:194
 __mod_timer+0x960/0xd30 kernel/time/timer.c:1065
 mod_timer+0x2c/0x3c kernel/time/timer.c:1108
 garp_join_timer_arm net/802/garp.c:411 [inline]
 garp_join_timer+0x124/0x13c net/802/garp.c:424
 call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers+0x554/0x718 kernel/time/timer.c:1737
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1750
 __do_softirq+0x344/0xe20 kernel/softirq.c:558
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 invoke_softirq kernel/softirq.c:439 [inline]
 __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:637
 irq_exit+0x14/0x88 kernel/softirq.c:661
 handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710
 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899
 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267
 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline]
 __local_bh_enable_ip+0x260/0x4d0 kernel/softirq.c:388
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0xf8/0x180 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:408 [inline]
 batadv_tt_global_purge net/batman-adv/translation-table.c:2299 [inline]
 batadv_tt_purge+0x350/0x810 net/batman-adv/translation-table.c:3561
 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310
 worker_thread+0x910/0x1034 kernel/workqueue.c:2457
 kthread+0x37c/0x45c kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870