rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=3844/1/0x4000000000000000 softirq=25392/25397 fqs=0
rcu: 	(t=10500 jiffies g=17609 q=113 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g17609 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5149
rcu: rcu_preempt kthread starved for 10500 jiffies! g17609 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6558 Comm: syz.0.32 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:lockdep_hardirqs_on+0x5b/0x150 kernel/locking/lockdep.c:4460
Code: 8b 87 26 07 a9 00 00 f0 00 75 51 65 8b 05 7d c7 26 07 85 c0 75 7b 65 8b 05 3a c4 26 07 85 c0 75 70 83 3d 57 da 31 0e 00 75 32 <48> c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 6e 83
RSP: 0018:ffffc90003b6e398 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888026d09e00 RCX: f148578b21836900
RDX: 0000000000000002 RSI: ffffffff8dba842a RDI: ffffffff8184e82d
RBP: ffffc90003b6e450 R08: ffffffff8fa39637 R09: 1ffffffff1f472c6
R10: dffffc0000000000 R11: fffffbfff1f472c7 R12: ffffffff8b19c499
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200076dc78
FS:  00007f0aa81f06c0(0000) GS:ffff888125c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0aa81eff98 CR3: 000000007ff9c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __local_bh_enable_ip+0x12d/0x1c0 kernel/softirq.c:412
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
 tipc_sk_rcv+0x3e9/0x2ba0 net/tipc/socket.c:2489
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x2a0/0x3b0 net/tipc/node.c:1781
 tipc_sk_rcv+0x2636/0x2ba0 net/tipc/socket.c:2499
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_sk_push_backlog+0x4ef/0x900 net/tipc/socket.c:1312
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1366 [inline]
 tipc_sk_proto_rcv+0x8c3/0x1730 net/tipc/socket.c:2156
 tipc_sk_filter_rcv+0x2e7b/0x30b0 net/tipc/socket.c:2350
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0x8a5/0x2ba0 net/tipc/socket.c:2495
 tipc_node_xmit+0x1c9/0xe90 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x2a0/0x3b0 net/tipc/node.c:1781
 tipc_sk_backlog_rcv+0x1a1/0x230 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1150 [inline]
 __release_sock+0x24c/0x350 net/core/sock.c:3172
 release_sock+0x5f/0x1f0 net/core/sock.c:3726
 sockopt_release_sock net/core/sock.c:1155 [inline]
 sk_setsockopt+0x2076/0x2dc0 net/core/sock.c:1668
 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340
 __sys_setsockopt net/socket.c:2369 [inline]
 __do_sys_setsockopt net/socket.c:2375 [inline]
 __se_sys_setsockopt net/socket.c:2372 [inline]
 __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0aa738e969
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:00007f0aa81f0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f0aa75b6080 RCX: 00007f0aa738e969
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f0aa7410ab1 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f0aa75b6080 R15: 00007ffc5a4367f8
 </TASK>
CPU: 1 UID: 0 PID: 6557 Comm: syz.0.32 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 3e 4d 96 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 37 0e 00 f3 0f 1e fa fb f4 <e9> 13 4d 96 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003bcf698 EFLAGS: 000002d3
RAX: ffffffff8172213d RBX: 0000000000000003 RCX: ffff888026d08000
RDX: 0000000000000000 RSI: ffffffff8d9b8fae RDI: ffffffff8be33880
RBP: ffffc90003bcf770 R08: ffffffff8fa39637 R09: 1ffffffff1f472c6
R10: dffffc0000000000 R11: fffffbfff1f472c7 R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff92000779ed8
FS:  00007f0aa82116c0(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000007ff9c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 kvm_wait+0x232/0x290 arch/x86/kernel/kvm.c:1064
 pv_wait arch/x86/include/asm/paravirt.h:569 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x7bf/0xb60 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x21f/0x290 kernel/locking/spinlock_debug.c:116
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x6a/0x100 net/core/sock.c:3714
 lock_sock include/net/sock.h:1669 [inline]
 tipc_sendstream+0x47/0x70 net/tipc/socket.c:1545
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0aa738e969
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:00007f0aa8211038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0aa75b5fa0 RCX: 00007f0aa738e969
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000004
RBP: 00007f0aa7410ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0aa75b5fa0 R15: 00007ffc5a4367f8
 </TASK>