rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=886c/0/0x1 softirq=0/0 fqs=0 rcuc=10500 jiffies(starved)
rcu: 	(t=10500 jiffies g=60501 q=321 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g60501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=63993
rcu: rcu_preempt kthread starved for 10500 jiffies! g60501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27680 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x1553/0x5240 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14154 Comm: syz.6.2502 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:754
Code: c3 18 1e 50 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d e9 62 a5 10 74 11 83 e0 04 c1 e8 02 5b <41> 5e 41 5f e9 47 95 7e 09 cc e8 d1 e0 89 ff eb e8 48 c7 c7 c0 1e
RSP: 0018:ffffc9001768f220 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8187e4fc RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8ba67a60 RDI: ffffffff8ba67a20
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1006f85601 R12: 0000000000000002
R13: ffffffff8ddcb980 R14: ffffffff8d808798 R15: dffffc0000000000
FS:  00007f43968f66c0(0000) GS:ffff888126432000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b5d473aa38 CR3: 00000000583e2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x57/0x2e0 kernel/locking/lockdep.c:5831
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 __local_bh_disable_ip+0x205/0x420 kernel/softirq.c:174
 local_bh_disable include/linux/bottom_half.h:20 [inline]
 spin_lock_bh include/linux/spinlock_rt.h:89 [inline]
 tipc_skb_peek_port net/tipc/msg.h:1225 [inline]
 tipc_sk_rcv+0x2c4/0x2bb0 net/tipc/socket.c:2491
 tipc_node_xmit+0x227/0xf10 net/tipc/node.c:1701
 __tipc_sendstream+0xaff/0x12b0 net/tipc/socket.c:1622
 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1546