rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=83f/1/0x4000000000000002 softirq=44648/44649 fqs=2100 
	(detected by 1, t=10506 jiffies, g=47713, q=200055)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4334 Comm: kworker/0:18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5363 [inline]
RIP: 0010:lock_is_held_type+0xb4/0x190 kernel/locking/lockdep.c:5666
Code: df 49 81 c7 f0 0a 00 00 45 31 e4 49 83 fc 31 73 24 4c 89 ff 4c 89 f6 e8 fa 01 00 00 85 c0 75 2a 49 ff c4 48 63 83 e8 0a 00 00 <49> 83 c7 28 49 39 c4 7c d8 eb 11 48 c7 c7 60 e7 1e 8c 4c 89 e6 e8
RSP: 0018:ffffc900030cebb8 EFLAGS: 00000002
RAX: 0000000000000007 RBX: ffff88802ac79dc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8c31ef20 RDI: ffff88802ac7a8d8
RBP: 00000000ffffffff R08: ffffc900030cecb7 R09: ffffc900030ceca0
R10: dffffc0000000000 R11: fffff52000619d97 R12: 0000000000000002
R13: 0000000000000046 R14: ffffffff8c31ef20 R15: ffff88802ac7a8d8
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39ecdf8540 CR3: 000000005850b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __perf_output_begin kernel/events/ring_buffer.c:170 [inline]
 perf_output_begin_forward+0x1af/0xa30 kernel/events/ring_buffer.c:271
 __perf_event_output kernel/events/core.c:7804 [inline]
 perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822
 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900030cf380 EFLAGS: 00000206
RAX: 5159620f357e5c00 RBX: 1ffff92000619e74 RCX: 5159620f357e5c00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2a40
RBP: ffffc900030cf450 R08: ffffffff901e918f R09: 1ffffffff203d231
R10: dffffc0000000000 R11: fffffbfff203d232 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 atomic_notifier_call_chain+0x254/0x280 kernel/notifier.c:199
 call_fib_notifiers+0x2d/0x60 net/core/fib_notifier.c:35
 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:401 [inline]
 fib6_add_rt2node net/ipv6/ip6_fib.c:1227 [inline]
 fib6_add+0x1bfd/0x3ee0 net/ipv6/ip6_fib.c:1484
 __ip6_ins_rt net/ipv6/route.c:1306 [inline]
 ip6_ins_rt+0xd3/0x130 net/ipv6/route.c:1316
 __ipv6_ifa_notify+0x4e4/0xe60 net/ipv6/addrconf.c:6188
 ipv6_ifa_notify net/ipv6/addrconf.c:6227 [inline]
 addrconf_dad_completed+0x186/0xc80 net/ipv6/addrconf.c:4239
 addrconf_dad_work+0xc83/0x1530 net/ipv6/addrconf.c:-1
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>