rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=27017, q=140 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294970300-4294959798), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g27017 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:28648 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 8170 Comm: syz.0.283 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: ab 18 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 a2 56 ef 0e 0f 82 74 02 00 00 8b 35 1a 87 ef 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 b9 aa 18 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc90005836b20 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c9520 RCX: 000000003527426d
RDX: 0000000000000000 RSI: ffffffff8daa4a46 RDI: ffffffff8bf2b500
RBP: 0000000000000002 R08: 00000000482ece24 R09: 000000004482ece2
R10: 0000000000000002 R11: ffff88801db7e6b0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd779f566c0(0000) GS:ffff8881249fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd7787dcf98 CR3: 000000007f9da000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 tipc_sk_lookup+0xcd/0xa00 net/tipc/socket.c:2997
 tipc_sk_rcv+0x2bf/0x1c00 net/tipc/socket.c:2490
 tipc_node_xmit+0x232/0xfc0 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781
 tipc_sk_rcv+0x9d4/0x1c00 net/tipc/socket.c:2499
 tipc_node_xmit+0x232/0xfc0 net/tipc/node.c:1701
 tipc_sk_push_backlog+0x318/0xa00 net/tipc/socket.c:1312
 tipc_sk_filter_connect net/tipc/socket.c:2253 [inline]
 tipc_sk_filter_rcv+0x13d4/0x3030 net/tipc/socket.c:2362
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0xf87/0x1c00 net/tipc/socket.c:2495
 tipc_node_xmit+0x232/0xfc0 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781
 tipc_sk_backlog_rcv+0x16f/0x1e0 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1177 [inline]
 __release_sock+0x3a9/0x450 net/core/sock.c:3213
 release_sock+0x5a/0x220 net/core/sock.c:3795
 sockopt_release_sock net/core/sock.c:1161 [inline]
 sk_setsockopt+0x497/0x3d50 net/core/sock.c:1674
 do_sock_setsockopt+0x193/0x1d0 net/socket.c:2318
 __sys_setsockopt+0x120/0x1a0 net/socket.c:2347
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd77918f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd779f56038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fd7793e6270 RCX: 00007fd77918f7c9
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007fd779213f91 R08: 0000000000000009 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd7793e6308 R14: 00007fd7793e6270 R15: 00007ffd2ba80fd8
 </TASK>