INFO: task poweroff:13235 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:poweroff        state:D stack:25656 pid:13235 tgid:13235 ppid:5203   task_flags:0x400000 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
 sync_bdevs+0xfd/0x360 block/bdev.c:1288
 ksys_sync+0xb2/0x150 fs/sync.c:105
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08a1b2ff37
RSP: 002b:00007ffcf2377e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f08a1b2ff37
RDX: ffffffffffffff88 RSI: 00007f08a1cc8e51 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf2377fc8 R14: 00007f08a1d12000 R15: 000056355482dd98
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf0e/0x1260 kernel/hung_task.c:491
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13566 Comm: kworker/u8:48 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: krdsd rds_connect_worker
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_release+0x4b/0x2f0 kernel/locking/lockdep.c:5881
Code: 44 24 10 31 c0 0f 1f 44 00 00 65 8b 05 d2 7f 3e 12 83 f8 07 0f 87 38 02 00 00 89 c0 48 0f a3 05 1b 80 13 0f 0f 82 b1 01 00 00 <8b> 3d e3 b1 13 0f 85 ff 0f 84 25 01 00 00 65 8b 05 38 c1 3e 12 85
RSP: 0018:ffffc90000a081b0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff9b09d0d8 RCX: 1ffff1100c5b8ee3
RDX: 0000000000000000 RSI: ffffffff8c162880 RDI: ffffffff8df5de68
RBP: 0000000000000206 R08: 0000000000000001 R09: fffff52000141030
R10: 0000000000000206 R11: 0000000000002c10 R12: ffffffff84eb0395
R13: ffff888030af50d8 R14: ffffffff8bafed40 R15: 1ffff92000141046
FS:  0000000000000000(0000) GS:ffff8881247bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcb20194990 CR3: 00000000778df000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
 debug_object_assert_init+0x1c5/0x2f0 lib/debugobjects.c:1009
 debug_timer_assert_init kernel/time/timer.c:803 [inline]
 debug_assert_init kernel/time/timer.c:848 [inline]
 __mod_timer+0xad/0xd30 kernel/time/timer.c:1025
 reqsk_queue_hash_req net/ipv4/inet_connection_sock.c:1177 [inline]
 inet_csk_reqsk_queue_hash_add+0x137/0x1e0 net/ipv4/inet_connection_sock.c:1190
 tcp_conn_request+0x1d99/0x33b0 net/ipv4/tcp_input.c:7279
 tcp_v4_conn_request net/ipv4/tcp_ipv4.c:1740 [inline]
 tcp_v4_conn_request+0xc5/0x260 net/ipv4/tcp_ipv4.c:1734
 tcp_v6_conn_request+0x2f1/0x470 net/ipv6/tcp_ipv6.c:1329
 tcp_rcv_state_process+0xa66/0x4ec0 net/ipv4/tcp_input.c:6708
 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1949
 tcp_v4_rcv+0x3f3a/0x4640 net/ipv4/tcp_ipv4.c:2358
 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x3f2/0x720 net/ipv4/ip_input.c:239
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:260
 dst_input include/net/dst.h:471 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:454 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip_rcv+0x2e0/0x600 net/ipv4/ip_input.c:574
 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5979
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092
 process_backlog+0x442/0x15e0 net/core/dev.c:6444
 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7494
 napi_poll net/core/dev.c:7557 [inline]
 net_rx_action+0xa9f/0xfe0 net/core/dev.c:7684
 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
 do_softirq kernel/softirq.c:480 [inline]
 do_softirq+0xb2/0xf0 kernel/softirq.c:467
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:407
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
 __dev_queue_xmit+0xb06/0x4490 net/core/dev.c:4740
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 neigh_hh_output include/net/neighbour.h:531 [inline]
 neigh_output include/net/neighbour.h:545 [inline]
 ip_finish_output2+0xc38/0x21a0 net/ipv4/ip_output.c:235
 __ip_finish_output.part.0+0x1b4/0x350 net/ipv4/ip_output.c:313
 __ip_finish_output net/ipv4/ip_output.c:301 [inline]
 ip_finish_output net/ipv4/ip_output.c:323 [inline]
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x35e/0xa10 net/ipv4/ip_output.c:436
 dst_output include/net/dst.h:461 [inline]
 ip_local_out net/ipv4/ip_output.c:129 [inline]
 __ip_queue_xmit+0x1d30/0x2620 net/ipv4/ip_output.c:532
 __tcp_transmit_skb+0x265f/0x3df0 net/ipv4/tcp_output.c:1479
 tcp_transmit_skb net/ipv4/tcp_output.c:1497 [inline]
 tcp_connect+0x2e82/0x4e10 net/ipv4/tcp_output.c:4160
 tcp_v4_connect+0x153a/0x1bb0 net/ipv4/tcp_ipv4.c:345
 __inet_stream_connect+0x914/0xf60 net/ipv4/af_inet.c:677
 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:748
 kernel_connect+0x107/0x180 net/socket.c:3656
 rds_tcp_conn_path_connect+0x43e/0x7f0 net/rds/tcp_connect.c:176
 rds_connect_worker+0x1af/0x2c0 net/rds/threads.c:176
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>