rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=05d4/1/0x4000000000000000 softirq=30070/30070 fqs=0
rcu: 	(t=10500 jiffies g=19445 q=2860 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g19445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=9113
rcu: rcu_preempt kthread starved for 10500 jiffies! g19445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:28776 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7026
 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+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
CPU: 0 UID: 0 PID: 9680 Comm: syz.4.948 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:102 [inline]
RIP: 0010:do_raw_spin_unlock+0xae/0x230 kernel/locking/spinlock_debug.c:141
Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8d 63 10 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 65 48 8b 05 ca 68 08 12 <48> 39 43 10 0f 85 d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d
RSP: 0018:ffffc90004356ce0 EFLAGS: 00000246
RAX: ffff888078daa480 RBX: ffffc90004357098 RCX: ffffffff819916f3
RDX: 1ffff9200086ae15 RSI: 0000000000000004 RDI: ffffc90004357098
RBP: ffffc90004356f00 R08: 0000000000000000 R09: fffff5200086ae13
R10: ffffc9000435709b R11: 0000000000000001 R12: ffffc900043570a8
R13: dffffc0000000000 R14: 0000000000000001 R15: 00000000e262ea88
FS:  00007f06722256c0(0000) GS:ffff888124a08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06721e3d58 CR3: 000000005d70b000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:166 [inline]
 _raw_spin_unlock_bh+0x1e/0x30 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
 tipc_sk_rcv+0x2b2/0x1c40 net/tipc/socket.c:2489
 tipc_node_xmit+0x232/0xfc0 net/tipc/node.c:1701
 tipc_node_xmit_skb+0xef/0x160 net/tipc/node.c:1766
 tipc_sk_rcv+0x16ea/0x1c40 net/tipc/socket.c:2520
 tipc_node_xmit+0x232/0xfc0 net/tipc/node.c:1701
 tipc_sk_push_backlog+0x318/0x9e0 net/tipc/socket.c:1312
 tipc_sk_filter_connect net/tipc/socket.c:2253 [inline]
 tipc_sk_filter_rcv+0x13fe/0x30b0 net/tipc/socket.c:2362
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0xfb4/0x1c40 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:1158 [inline]
 __release_sock+0x3a9/0x450 net/core/sock.c:3180
 release_sock+0x5a/0x220 net/core/sock.c:3735
 tipc_release+0xa37/0x16f0 net/tipc/socket.c:650
 __sock_release+0xb3/0x270 net/socket.c:662
 sock_close+0x1c/0x30 net/socket.c:1455
 __fput+0x402/0xb70 fs/file_table.c:468
 task_work_run+0x150/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f067138e969
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:00007f0672225038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007f06715b5fa0 RCX: 00007f067138e969
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007f0671410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f06715b5fa0 R15: 00007ffc0db2ad88
 </TASK>