rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=766c/1/0x4000000000000000 softirq=15108/15108 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=12233, q=924 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:do_raw_spin_unlock+0x12a/0x240 kernel/locking/spinlock_debug.c:143
Code: 48 c7 c7 78 c7 da 8d e8 54 87 88 00 48 83 3d f4 32 3c 0c 00 0f 84 14 01 00 00 48 89 df e8 de 1d be 09 90 5b 41 5c 41 5d 41 5e <41> 5f 5d e9 69 ac 71 ff cc e8 98 2b ec 02 85 c0 0f 84 00 ff ff ff
RSP: 0018:ffffc90000007c48 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff8880696162a8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880696162a8
RBP: 1ffff1100d2c2c56 R08: ffff8880696162ab R09: 1ffff1100d2c2c55
R10: dffffc0000000000 R11: ffffed100d2c2c56 R12: ffff888069616300
R13: ffff888069616000 R14: 188b52b532f3defe R15: ffff8880696162b0
FS:  0000000000000000(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 0000000079ca1000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 advance_sched+0x99f/0xc90 net/sched/sch_taprio.c:987
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x1ac0/0x23d0 arch/x86/kernel/unwind_orc.c:695
Code: 48 c7 c2 a0 91 68 8b e8 fe 20 2a 00 48 c7 c7 a0 1a f4 8d 4c 89 fe e8 af 07 2a 00 e8 2a 98 33 00 89 d8 48 81 c4 98 00 00 00 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 0d 29 9c ff cc 4c 8b 7c 24 50 eb 89
RSP: 0018:ffffc90000117218 EFLAGS: 00000292
RAX: 0000000090174801 RBX: ffffc90000117300 RCX: 0000000080000202
RDX: 0000000000000006 RSI: ffffffff8d97796a RDI: ffff88801c2a5b80
RBP: dffffc0000000000 R08: ffffc90000117d90 R09: ffffc90000117298
R10: dffffc0000000000 R11: fffff52000022e55 R12: ffffc90000117da0
R13: ffffc90000110000 R14: ffffc90000117248 R15: ffffffff8173fdd5
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270
 kmem_alloc_batch lib/debugobjects.c:371 [inline]
 fill_pool+0x100/0x570 lib/debugobjects.c:403
 debug_objects_fill_pool lib/debugobjects.c:725 [inline]
 debug_object_assert_init+0x2b1/0x380 lib/debugobjects.c:1003
 debug_timer_assert_init kernel/time/timer.c:803 [inline]
 debug_assert_init kernel/time/timer.c:848 [inline]
 __mod_timer+0x4a/0xf30 kernel/time/timer.c:1025
 addrconf_mod_rs_timer net/ipv6/addrconf.c:331 [inline]
 addrconf_dad_completed+0x943/0xd60 net/ipv6/addrconf.c:4368
 addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g12233 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3436
rcu: rcu_preempt kthread starved for 10505 jiffies! g12233 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:28072 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>