rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10456 ticks this GP) idle=6254/1/0x4000000000000000 softirq=0/0 fqs=5177 rcuc=10848 jiffies(starved)
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5946        968          382
rcu: 	cputime:      270          8        52178   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=22853 q=613147 ncpus=2)
CPU: 0 UID: 0 PID: 7120 Comm: syz.0.140 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 4b b2 06 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90003e9eba0 EFLAGS: 00000206
RAX: d106b949c9c87300 RBX: 0000000000000000 RCX: d106b949c9c87300
RDX: 0000000000000000 RSI: ffffffff8cf6550b RDI: ffffffff8b3ddfe0
RBP: ffffffff81849131 R08: 0000000000000000 R09: ffffffff81849131
R10: ffff8882301cda9a R11: ffffed1046039b55 R12: 0000000000000002
R13: ffffffff8d44aca0 R14: 0000000000000001 R15: 0000000000000246
FS:  00007fbd3bf3e6c0(0000) GS:ffff888126df7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed7bdda270 CR3: 0000000056242000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __local_bh_disable_ip+0xc5/0x540 kernel/softirq.c:163
 local_bh_disable include/linux/bottom_half.h:20 [inline]
 spin_lock_bh include/linux/spinlock_rt.h:87 [inline]
 rt_add_uncached_list net/ipv4/route.c:1533 [inline]
 rt_set_nexthop+0x1d6/0xa80 net/ipv4/route.c:1635
 __mkroute_output net/ipv4/route.c:2681 [inline]
 ip_route_output_key_hash_rcu+0x196a/0x23e0 net/ipv4/route.c:2875
 ip_route_output_key_hash+0x174/0x280 net/ipv4/route.c:2705
 __ip_route_output_key include/net/route.h:169 [inline]
 ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
 ip_route_output_key include/net/route.h:179 [inline]
 ip_tunnel_xmit+0x96b/0x2390 net/ipv4/ip_tunnel.c:781
 __gre_xmit net/ipv4/ip_gre.c:488 [inline]
 ipgre_xmit+0x89e/0xc50 net/ipv4/ip_gre.c:692
 __netdev_start_xmit include/linux/netdevice.h:5248 [inline]
 netdev_start_xmit include/linux/netdevice.h:5257 [inline]
 xmit_one net/core/dev.c:3845 [inline]
 dev_hard_start_xmit+0x2f0/0x870 net/core/dev.c:3861
 __dev_queue_xmit+0x1b50/0x3b70 net/core/dev.c:4763
 dev_queue_xmit include/linux/netdevice.h:3365 [inline]
 __bpf_tx_skb net/core/filter.c:2153 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2183 [inline]
 __bpf_redirect+0xaef/0x13c0 net/core/filter.c:2206
 ____bpf_clone_redirect net/core/filter.c:2480 [inline]
 bpf_clone_redirect+0x272/0x3d0 net/core/filter.c:2450
 bpf_prog_3e1cbbed0c4acd81+0x5f/0x68
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 bpf_test_run+0x313/0x7a0 net/bpf/test_run.c:423
 bpf_prog_test_run_skb+0xb4e/0x1550 net/bpf/test_run.c:1091
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4688
 __sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6167
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd3c8cefc9