rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=74ac/1/0x4000000000000000 softirq=21048/21049 fqs=2
rcu: 	(t=30500 jiffies g=46949 q=5 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 30495 jiffies! g46949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=20630
rcu: rcu_preempt kthread starved for 30496 jiffies! g46949 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:0     pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00000000
Call Trace:
[<ffffffff8624d1e2>] context_switch kernel/sched/core.c:5377 [inline]
[<ffffffff8624d1e2>] __schedule+0xe4c/0x3d70 kernel/sched/core.c:6764
[<ffffffff862501ca>] __schedule_loop kernel/sched/core.c:6841 [inline]
[<ffffffff862501ca>] schedule+0xc4/0x324 kernel/sched/core.c:6856
[<ffffffff862643fa>] schedule_timeout+0x13e/0x28a kernel/time/sleep_timeout.c:99
[<ffffffff803779d0>] rcu_gp_fqs_loop+0x776/0xa80 kernel/rcu/tree.c:2024
[<ffffffff8037ab6e>] rcu_gp_kthread+0x22c/0x2a2 kernel/rcu/tree.c:2226
[<ffffffff801d3b2e>] kthread+0x37e/0x7b6 kernel/kthread.c:464
[<ffffffff8626888e>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3496 Comm: syz-executor Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
epc : arch_static_branch arch/riscv/include/asm/jump_label.h:39 [inline]
epc : kfence_alloc include/linux/kfence.h:121 [inline]
epc : slab_alloc_node mm/slub.c:4148 [inline]
epc : __kmalloc_cache_noprof+0x68/0x3f8 mm/slub.c:4320
 ra : slab_pre_alloc_hook mm/slub.c:4068 [inline]
 ra : slab_alloc_node mm/slub.c:4144 [inline]
 ra : __kmalloc_cache_noprof+0x60/0x3f8 mm/slub.c:4320
epc : ffffffff809cc0bc ra : ffffffff809cc0b4 sp : ffff8f80000173b0
 gp : ffffffff89c1d3c0 tp : ffffaf8034890000 t0 : ffff8f8000017520
 t1 : fffff5ef036f48bb t2 : 000000000000001b s0 : ffff8f8000017460
 s1 : ffffaf8011401780 a0 : 0000000000000000 a1 : 0000000000000020
 a2 : 0000000000000001 a3 : 0000000000000000 a4 : 0000000000ff0100
 a5 : 0000000000000000 a6 : ffffffff809cc09e a7 : ffffaf801b7a45db
 s2 : 0000000000002920 s3 : 0000000000002920 s4 : 0000000000000020
 s5 : ffffffff89c3ab00 s6 : ffffffff8193885a s7 : ffffffff87d90288
 s8 : 0000000000000000 s9 : 1ffff5f003a9bea2 s10: 1ffff5f003a9beab
 s11: 1ffff1f000002ee0 t3 : ffffaf8034890b30 t4 : fffff5ef036f48bb
 t5 : fffff5ef036f48bc t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff809cc0bc>] slab_alloc_node mm/slub.c:4145 [inline]
[<ffffffff809cc0bc>] __kmalloc_cache_noprof+0x68/0x3f8 mm/slub.c:4320
[<ffffffff8193885a>] kmalloc_noprof include/linux/slab.h:901 [inline]
[<ffffffff8193885a>] kzalloc_noprof include/linux/slab.h:1037 [inline]
[<ffffffff8193885a>] ref_tracker_alloc+0x18e/0x544 lib/ref_tracker.c:203
[<ffffffff84fb94e2>] __netdev_tracker_alloc include/linux/netdevice.h:4275 [inline]
[<ffffffff84fb94e2>] netdev_hold include/linux/netdevice.h:4304 [inline]
[<ffffffff84fb94e2>] dst_init+0xca/0x506 net/core/dst.c:52
[<ffffffff84fb99cc>] dst_alloc+0xae/0x174 net/core/dst.c:93
[<ffffffff85a483b4>] ip6_dst_alloc net/ipv6/route.c:342 [inline]
[<ffffffff85a483b4>] icmp6_dst_alloc+0x6e/0x4c8 net/ipv6/route.c:3275
[<ffffffff85a75c9a>] ndisc_send_skb+0x13a4/0x1c30 net/ipv6/ndisc.c:491
[<ffffffff85a7eb28>] ndisc_send_rs+0x112/0x5c6 net/ipv6/ndisc.c:721
[<ffffffff85a05c42>] addrconf_rs_timer+0x3da/0x80c net/ipv6/addrconf.c:4033
[<ffffffff803d60de>] call_timer_fn+0x202/0xab8 kernel/time/timer.c:1789
[<ffffffff803d72d8>] expire_timers kernel/time/timer.c:1840 [inline]
[<ffffffff803d72d8>] __run_timers+0x944/0xcf4 kernel/time/timer.c:2414
[<ffffffff803d77be>] __run_timer_base kernel/time/timer.c:2426 [inline]
[<ffffffff803d77be>] __run_timer_base kernel/time/timer.c:2418 [inline]
[<ffffffff803d77be>] run_timer_base+0x136/0x1b6 kernel/time/timer.c:2435
[<ffffffff803d785a>] run_timer_softirq+0x1c/0x52 kernel/time/timer.c:2445
[<ffffffff80156a7a>] handle_softirqs+0x4b2/0x132e kernel/softirq.c:561
[<ffffffff80157bc6>] __do_softirq kernel/softirq.c:595 [inline]
[<ffffffff80157bc6>] invoke_softirq kernel/softirq.c:435 [inline]
[<ffffffff80157bc6>] __irq_exit_rcu+0x18c/0x550 kernel/softirq.c:662
[<ffffffff801595cc>] irq_exit_rcu+0x10/0xf8 kernel/softirq.c:678
[<ffffffff86242304>] handle_riscv_irq+0x40/0x4c arch/riscv/kernel/traps.c:378
[<ffffffff862688ca>] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:356
CPU: 0 UID: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: ipv6_addrconf addrconf_dad_work
epc : arch_static_branch arch/riscv/include/asm/jump_label.h:39 [inline]
epc : kfence_alloc include/linux/kfence.h:121 [inline]
epc : slab_alloc_node mm/slub.c:4148 [inline]
epc : __kmalloc_cache_noprof+0x68/0x3f8 mm/slub.c:4320
 ra : slab_pre_alloc_hook mm/slub.c:4068 [inline]
 ra : slab_alloc_node mm/slub.c:4144 [inline]
 ra : __kmalloc_cache_noprof+0x60/0x3f8 mm/slub.c:4320
epc : ffffffff809cc0bc ra : ffffffff809cc0b4 sp : ffff8f80000c7180
 gp : ffffffff89c1d3c0 tp : ffffaf8012ac3480 t0 : 41f606a8f74adf85
 t1 : ffffaf8012ac4050 t2 : 0000000000000005 s0 : ffff8f80000c7230
 s1 : ffffaf8011401280 a0 : 0000000000000000 a1 : 0000000000000060
 a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
 a5 : 0000000000000000 a6 : ffffffff809cc09e a7 : ffffffff88cd689f
 s2 : 0000000000000920 s3 : 0000000000000920 s4 : 0000000000000050
 s5 : ffffffff89c3ab00 s6 : ffffffff8357fe80 s7 : 0000000000000000
 s8 : fffffffef13a4928 s9 : 0000000000000000 s10: 0000000000000000
 s11: ffffaf8036384c00 t3 : ffffaf8012ac3fb0 t4 : 1ffff5f0025587f5
 t5 : 1ffff5f00255880e t6 : 0000000000000007
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000005
[<ffffffff809cc0bc>] slab_alloc_node mm/slub.c:4145 [inline]
[<ffffffff809cc0bc>] __kmalloc_cache_noprof+0x68/0x3f8 mm/slub.c:4320
[<ffffffff8357fe80>] kmalloc_noprof include/linux/slab.h:901 [inline]
[<ffffffff8357fe80>] kzalloc_noprof include/linux/slab.h:1037 [inline]
[<ffffffff8357fe80>] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:990 [inline]
[<ffffffff8357fe80>] nsim_fib_event_nb+0x1c8/0xe68 drivers/net/netdevsim/fib.c:1043
[<ffffffff801e001c>] notifier_call_chain+0xa8/0x5f2 kernel/notifier.c:85
[<ffffffff801e077a>] atomic_notifier_call_chain+0x80/0x1f0 kernel/notifier.c:223
[<ffffffff85076228>] call_fib_notifiers+0x3c/0x82 net/core/fib_notifier.c:35
[<ffffffff85b118e6>] call_fib6_notifiers+0x48/0x62 net/ipv6/fib6_notifier.c:22
[<ffffffff85a62bd6>] call_fib6_entry_notifiers net/ipv6/ip6_fib.c:397 [inline]
[<ffffffff85a62bd6>] fib6_add_rt2node net/ipv6/ip6_fib.c:1231 [inline]
[<ffffffff85a62bd6>] fib6_add+0x21a2/0x4706 net/ipv6/ip6_fib.c:1488
[<ffffffff85a3f15e>] __ip6_ins_rt net/ipv6/route.c:1317 [inline]
[<ffffffff85a3f15e>] ip6_ins_rt+0xbc/0x116 net/ipv6/route.c:1327
[<ffffffff859f2472>] __ipv6_ifa_notify+0x904/0xb2e net/ipv6/addrconf.c:6262
[<ffffffff85a061c0>] ipv6_ifa_notify net/ipv6/addrconf.c:6301 [inline]
[<ffffffff85a061c0>] addrconf_dad_completed+0x14c/0xe38 net/ipv6/addrconf.c:4316
[<ffffffff85a07682>] addrconf_dad_work+0x7d6/0x13ec net/ipv6/addrconf.c:4264
[<ffffffff801b3668>] process_one_work+0x96a/0x1f3a kernel/workqueue.c:3236
[<ffffffff801b667a>] process_scheduled_works kernel/workqueue.c:3317 [inline]
[<ffffffff801b667a>] worker_thread+0x5be/0xdc6 kernel/workqueue.c:3398
[<ffffffff801d3b2e>] kthread+0x37e/0x7b6 kernel/kthread.c:464
[<ffffffff8626888e>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327