rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=be24/1/0x4000000000000000 softirq=16761/16768 fqs=0
	(t=10501 jiffies g=17561 q=55 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g17561 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=12247
rcu: rcu_preempt kthread starved for 10504 jiffies! g17561 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:27840 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5246 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6563
 schedule+0xb9/0x180 kernel/sched/core.c:6639
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </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 PID: 8281 Comm: syz.0.1272 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x52a/0x9c0 kernel/locking/qspinlock.c:511
Code: 8b 44 24 18 c6 00 00 48 8b 44 24 10 42 0f b6 04 28 84 c0 0f 85 1b 01 00 00 48 8d 43 01 c6 00 01 41 bc 00 80 ff ff eb 07 f3 90 <41> ff c4 74 47 43 0f b6 04 2e 84 c0 75 2b 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc900041d77e0 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff88805d504698 RCX: f7fee95f16181700
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf6420
RBP: ffffc900041d78d8 R08: ffffffff90b13357 R09: 1ffffffff216266a
R10: dffffc0000000000 R11: fffffbfff216266b R12: 00000000ffffe019
R13: dffffc0000000000 R14: 1ffff1100baa08d3 R15: ffff8880b8f30001
FS:  00007f97357256c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9735724ff8 CR3: 000000001dadd000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [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+0x265/0x2f0 kernel/locking/spinlock_debug.c:115
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 lock_sock_nested+0x66/0x100 net/core/sock.c:3507
 lock_sock include/net/sock.h:1805 [inline]
 tipc_sendstream+0x43/0x70 net/tipc/socket.c:1553
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f973479e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9735725028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9734a26090 RCX: 00007f973479e159
RDX: 0000000000004004 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007f9734835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9734a26128 R14: 00007f9734a26090 R15: 00007ffda6f2fe68
 </TASK>
CPU: 0 PID: 8276 Comm: syz.0.1272 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:lockdep_rht_mutex_is_held+0x0/0x90 lib/rhashtable.c:48
Code: c6 00 18 df 8a 48 c7 c2 80 17 df 8a 4d 89 f8 e8 06 84 24 00 4d 89 f5 48 8b 2c 24 e9 ec fc ff ff 00 00 cc cc 00 00 cc cc 00 00 <55> 53 48 89 fb e8 26 e6 6c fd 48 c7 c0 64 4b 21 8e 48 c1 e8 03 48
RSP: 0018:ffffc90004146538 EFLAGS: 00000202
RAX: ffffffff89cfffa5 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88802c468000 RSI: 0000000000000001 RDI: ffff88807e1fd138
RBP: ffffc90004146630 R08: dffffc0000000000 R09: 1ffffffff2162648
R10: dffffc0000000000 R11: fffffbfff2162649 R12: ffff88807e1fd138
R13: ffff88805bd24000 R14: dffffc0000000000 R15: ffff88807e1fc000
FS:  00007f97357466c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9735725d58 CR3: 000000001dadd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __rhashtable_lookup include/linux/rhashtable.h:594 [inline]
 rhashtable_lookup include/linux/rhashtable.h:638 [inline]
 tipc_sk_lookup+0x191/0x920 net/tipc/socket.c:3007
 tipc_sk_rcv+0x408/0x2bc0 net/tipc/socket.c:2498
 tipc_node_xmit+0x22e/0xfc0 net/tipc/node.c:1708
 tipc_node_xmit_skb net/tipc/node.c:1773 [inline]
 tipc_node_distr_xmit+0x2c7/0x3f0 net/tipc/node.c:1788
 tipc_sk_rcv+0x2643/0x2bc0 net/tipc/socket.c:2507
 tipc_node_xmit+0x22e/0xfc0 net/tipc/node.c:1708
 tipc_sk_push_backlog net/tipc/socket.c:1317 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2261 [inline]
 tipc_sk_filter_rcv+0x1b69/0x3250 net/tipc/socket.c:2370
 tipc_sk_enqueue net/tipc/socket.c:2451 [inline]
 tipc_sk_rcv+0x8cc/0x2bc0 net/tipc/socket.c:2503
 tipc_node_xmit+0x22e/0xfc0 net/tipc/node.c:1708
 tipc_node_xmit_skb net/tipc/node.c:1773 [inline]
 tipc_node_distr_xmit+0x2c7/0x3f0 net/tipc/node.c:1788
 tipc_sk_backlog_rcv+0x1aa/0x260 net/tipc/socket.c:2418
 sk_backlog_rcv include/net/sock.h:1138 [inline]
 __release_sock+0x1e6/0x460 net/core/sock.c:2953
 release_sock+0x5b/0x1b0 net/core/sock.c:3519
 sockopt_release_sock net/core/sock.c:1064 [inline]
 sk_setsockopt+0x224b/0x29a0 net/core/sock.c:1547
 __sys_setsockopt+0x2f6/0x3d0 net/socket.c:2284
 __do_sys_setsockopt net/socket.c:2299 [inline]
 __se_sys_setsockopt net/socket.c:2296 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2296
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f973479e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9735746028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f9734a25fa0 RCX: 00007f973479e159
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f9734835024 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9734a26038 R14: 00007f9734a25fa0 R15: 00007ffda6f2fe68
 </TASK>