syzbot

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-...D } 2655 jiffies s: 613 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11 Comm: kworker/u8:1 Not tainted 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:__lock_acquire+0x47c/0x1fd0 kernel/locking/lockdep.c:5080
Code: 41 09 c7 41 09 cf 41 09 ff 48 8b 44 24 20 0f b6 04 30 84 c0 0f 85 13 13 00 00 44 8b a4 24 e0 00 00 00 48 8b 44 24 10 44 89 38 <49> 89 c7 4c 8b 74 24 28 4b 8d 5c f0 24 48 89 d8 48 c1 e8 03 0f b6
RSP: 0018:ffffc90000a087f0 EFLAGS: 00000046
RAX: ffff888016eec888 RBX: 0000000000004000 RCX: 0000000000040000
RDX: 0000000000080000 RSI: dffffc0000000000 RDI: 000000000000c000
RBP: 0000000000000032 R08: ffff888016eec6d8 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1f51fde R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 00000000000cc000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000600 CR3: 000000000e134000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 debug_objects_fill_pool+0x9f/0x9b0 lib/debugobjects.c:614
 debug_object_activate+0x135/0x510 lib/debugobjects.c:704
 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1090
 __run_hrtimer kernel/time/hrtimer.c:1709 [inline]
 __hrtimer_run_queues+0x6d5/0xd50 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:ipv6_get_saddr_eval+0x56b/0xf50 net/ipv6/addrconf.c:1666
Code: 85 f4 07 00 00 41 8b 0e 48 89 df 48 8b 74 24 20 8b 54 24 1c e8 76 fe 01 00 89 c3 49 83 c4 10 4c 89 e0 48 c1 e8 03 0f b6 04 28 <84> c0 0f 85 e5 07 00 00 41 8b 2c 24 89 df 89 ee e8 80 b1 73 f7 45
RSP: 0018:ffffc90000106b30 EFLAGS: 00000216
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc90000106a03
RDX: 0000000000000009 RSI: ffffffff8bcaca20 RDI: ffffffff8c1f96e0
RBP: dffffc0000000000 R08: ffffffff8fa8feef R09: 1ffffffff1f51fdd
R10: dffffc0000000000 R11: fffffbfff1f51fde R12: ffffc90000106cd0
R13: ffff888022164000 R14: ffff888079e4a0e0 R15: 0000000000000006
 __ipv6_dev_get_saddr+0x1d3/0x4b0 net/ipv6/addrconf.c:1753
 ipv6_dev_get_saddr+0x42b/0xba0 net/ipv6/addrconf.c:1888
 ip6_route_get_saddr include/net/ip6_route.h:140 [inline]
 ip6_dst_lookup_tail+0xc83/0x11a0 net/ipv6/ip6_output.c:1125
 ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1250
 udp_tunnel6_dst_lookup+0x2c0/0x520 net/ipv6/ip6_udp_tunnel.c:165
 geneve6_xmit_skb drivers/net/geneve.c:942 [inline]
 geneve_xmit+0xb99/0x2e60 drivers/net/geneve.c:1027
 __netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 netdev_start_xmit include/linux/netdevice.h:4917 [inline]
 xmit_one net/core/dev.c:3531 [inline]
 dev_hard_start_xmit+0x27c/0x7e0 net/core/dev.c:3547
 __dev_queue_xmit+0x1ad1/0x3ca0 net/core/dev.c:4341
 neigh_output include/net/neighbour.h:542 [inline]
 ip6_finish_output2+0xffa/0x1670 net/ipv6/ip6_output.c:137
 ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:222
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ndisc_send_skb+0xab0/0x1380 net/ipv6/ndisc.c:509
 ndisc_send_ns+0xcc/0x160 net/ipv6/ndisc.c:667
 addrconf_dad_work+0xb45/0x16f0 net/ipv6/addrconf.c:4280
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa12/0x17c0 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 4.760 msecs