syzbot

watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [kworker/1:4:4012]
Modules linked in:
irq event stamp: 10841
hardirqs last  enabled at (10840): [<ffff800011976ce0>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:81 [inline]
hardirqs last  enabled at (10840): [<ffff800011976ce0>] exit_to_kernel_mode+0x100/0x178 arch/arm64/kernel/entry-common.c:91
hardirqs last disabled at (10841): [<ffff800011976f28>] enter_el1_irq_or_nmi+0x10/0x1c arch/arm64/kernel/entry-common.c:227
softirqs last  enabled at (10382): [<ffff800010903ed0>] spin_unlock_bh include/linux/spinlock.h:408 [inline]
softirqs last  enabled at (10382): [<ffff800010903ed0>] __fib6_clean_all+0x2ac/0x428 net/ipv6/ip6_fib.c:2254
softirqs last disabled at (10387): [<ffff8000081b6568>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (10387): [<ffff8000081b6568>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (10387): [<ffff8000081b6568>] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637
CPU: 1 PID: 4012 Comm: kworker/1:4 Not tainted 5.15.151-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: ipv6_addrconf addrconf_dad_work
pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queued_write_lock_slowpath+0x174/0x49c kernel/locking/qrwlock.c:78
lr : instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
lr : atomic_or include/linux/atomic/atomic-instrumented.h:377 [inline]
lr : queued_write_lock_slowpath+0x11c/0x49c kernel/locking/qrwlock.c:74
sp : ffff800008017300
x29: ffff800008017380 x28: ffff80001485e008 x27: 00000000000000ff
x26: 0000000000000100 x25: 1ffff00001002e6a x24: 1ffff00002d5ef67
x23: 1ffff00001002e64 x22: dfff800000000000 x21: ffff800008017350
x20: ffff800016af7b38 x19: ffff800016af7b3c x18: 0000000000000101
x17: 0000000000000000 x16: ffff80000830421c x15: 000000000000000a
x14: 1ffff0000292206a x13: dfff800000000000 x12: 0000000000000001
x11: 1ffff00002d5ef67 x10: 0000000000000000 x9 : 0000000000000000
x8 : 00000000000001ff x7 : ffff80000fdf5340 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008305374
x2 : 0000000000000001 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_write_lock_slowpath+0x174/0x49c kernel/locking/qrwlock.c:78
 queued_write_lock include/asm-generic/qrwlock.h:97 [inline]
 do_raw_write_lock+0x464/0x534 kernel/locking/spinlock_debug.c:210
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:204 [inline]
 _raw_write_lock_bh+0x12c/0x1c4 kernel/locking/spinlock.c:324
 neigh_forced_gc net/core/neighbour.c:236 [inline]
 neigh_alloc net/core/neighbour.c:429 [inline]
 ___neigh_create+0x294/0x24fc net/core/neighbour.c:591
 __neigh_create+0x44/0x58 net/core/neighbour.c:679
 ip6_finish_output2+0xc74/0x1c4c net/ipv6/ip6_output.c:123
 __ip6_finish_output+0x580/0x6ec net/ipv6/ip6_output.c:197
 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:207
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x270/0x594 net/ipv6/ip6_output.c:230
 dst_output include/net/dst.h:443 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xbf8/0x1788 net/ipv6/ndisc.c:509
 ndisc_send_rs+0x494/0x5fc net/ipv6/ndisc.c:703
 addrconf_rs_timer+0x308/0x5a8 net/ipv6/addrconf.c:3957
 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+0x344/0xdb0 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+0x264/0x4d4 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:454
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470
 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
 mutex_spin_on_owner+0x140/0x2fc kernel/locking/mutex.c:364
 mutex_optimistic_spin+0x4c/0x2bc kernel/locking/mutex.c:469
 __mutex_lock_common+0x1b4/0x2154 kernel/locking/mutex.c:599
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
 addrconf_dad_work+0xcc/0x126c net/ipv6/addrconf.c:4111
 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