INFO: task syz.1.4962:21740 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4962 state:D stack:25968 pid:21740 ppid:4281 flags:0x00004004
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_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
nfnetlink_rcv+0x2b0/0x2470 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
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: 0033:0x7f00e8d9f559
RSP: 002b:00007f00e9cab028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f00e9026180 RCX: 00007f00e8d9f559
RDX: 0000000000000000 RSI: 0000200000000400 RDI: 0000000000000004
RBP: 00007f00e8e36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00e9026218 R14: 00007f00e9026180 R15: 00007fff52e49008
</TASK>
INFO: task syz.1.4962:21741 blocked for more than 148 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4962 state:D stack:26544 pid:21741 ppid:4281 flags:0x00004004
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_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
nfnetlink_rcv+0x2b0/0x2470 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
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: 0033:0x7f00e8d9f559
RSP: 002b:00007f00e9c8a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f00e9026270 RCX: 00007f00e8d9f559
RDX: 0000000000044014 RSI: 0000200000000500 RDI: 0000000000000004
RBP: 00007f00e8e36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00e9026308 R14: 00007f00e9026270 R15: 00007fff52e49008
</TASK>
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0:
ffffffff8db2e230
(
rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8db2ea50
(
rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/27:
#0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8db2d8a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
3 locks held by kworker/u4:4/58:
#0:
ffff888018479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90001597d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2:
ffffffff8ed760e8
(
rtnl_mutex
){+.+.}-{3:3}
, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
1 lock held by dhcpcd/3935:
#0:
ffffffff8ed760e8
(
rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x27f/0x1bf0 net/ipv4/devinet.c:1080
2 locks held by getty/4030:
#0: ffff88814d89f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198
4 locks held by kworker/u4:20/4612:
#0: ffff88801861e938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90005c57d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffffffff8ed69250 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:594
#3: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
#3: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2ec/0x890 kernel/rcu/tree_exp.h:962
2 locks held by kworker/1:13/6905:
#0: ffff888018472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1:
ffffc9001c56fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}
, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
3 locks held by kworker/u4:38/11946:
2 locks held by kworker/0:0/16215:
#0: ffff8880b8c3acd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x98/0x130 kernel/sched/core.c:546
#1: ffff8880b8c27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x400/0x740 kernel/sched/psi.c:999
3 locks held by kworker/u4:14/19457:
3 locks held by syz.3.4865/21206:
1 lock held by syz.1.4962/21740:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.1.4962/21741:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.5.4986/21833:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}
, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.5.4986/21834:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.7.5074/22216:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: ip_set_nfnl_get_byindex+0x63/0x230 net/netfilter/ipset/ip_set_core.c:918
3 locks held by kworker/1:3/22215:
#0: ffff888018470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc90005a17d00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
#2: ffffffff8db33578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3c0/0x890 kernel/rcu/tree_exp.h:962
1 lock held by syz.6.5155/22622:
#0:
ffffffff9809a398
(
nfnl_subsys_ipset
){+.+.}-{3:3}
, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.6.5155/22624:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
1 lock held by syz.6.5155/22627:
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff9809a398 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xa58/0x1290 net/netfilter/nfnetlink.c:295
3 locks held by kworker/0:8/22678:
#0: ffff88814d566538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#1: ffffc900031c7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267
#2: ffffffff8ed760e8 (rtnl_mutex
){+.+.}-{3:3}, at: addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4687
1 lock held by syz-executor/22707:
1 lock held by syz-executor/22779:
#0: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
#0: ffffffff8ed760e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
3 locks held by syz.8.5192/22875:
#0: ffff8880784651e0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:521 [inline]
#0: ffff8880784651e0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x20e/0x500 net/bluetooth/hci_core.c:2718
#1: ffff888078464428 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x506/0x1060 net/bluetooth/hci_sync.c:5300
#2: ffffffff8eed5128 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1833 [inline]
#2: ffffffff8eed5128 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xac/0x290 net/bluetooth/hci_conn.c:2563
2 locks held by syz.4.5193/22881:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf0e/0xf50 kernel/hung_task.c:377
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11499 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: krdsd rds_connect_worker
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:55 [inline]
RIP: 0010:unwind_next_frame+0x1650/0x1fd0 arch/x86/kernel/unwind_orc.c:622
Code: 48 8d 7b 38 48 8b 44 24 40 0f 85 da 00 00 00 42 80 3c 28 00 74 05 e8 8f 91 9a 00 4c 8b 7b 38 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 74 91 9a 00 4c 8b 63 08 4c 8d 73 10 4c 89
RSP: 0018:ffffc90004e7f4a0 EFLAGS: 00000a06
RAX: 1ffff920009cfeaa RBX: ffffc90004e7f548 RCX: 0000000000000000
RDX: 1ffffffff2037c95 RSI: 0000000000000000 RDI: ffffc90004e7f550
RBP: dffffc0000000000 R08: ffffc90004e7f5a7 R09: ffffc90004e7f598
R10: dffffc0000000000 R11: fffff520009cfeb5 R12: ffffffff901be4aa
R13: dffffc0000000000 R14: ffffc90004e7f598 R15: ffffc90004e7fa18
FS: 0000000000000000(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b78fae0f70 CR3: 000000007e1a3000 CR4: 00000000003506f0
DR0: 0000000000010000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<TASK>
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__reset_page_owner+0x51/0x190 mm/page_owner.c:148
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
slab_alloc_node mm/slub.c:3359 [inline]
slab_alloc mm/slub.c:3367 [inline]
__kmem_cache_alloc_lru mm/slub.c:3374 [inline]
kmem_cache_alloc_lru+0x182/0x2e0 mm/slub.c:3390
alloc_inode_sb include/linux/fs.h:3278 [inline]
sock_alloc_inode+0x24/0xc0 net/socket.c:306
alloc_inode fs/inode.c:261 [inline]
new_inode_pseudo+0x5f/0x1c0 fs/inode.c:1063
sock_alloc net/socket.c:631 [inline]
__sock_create+0x129/0x940 net/socket.c:1514
rds_tcp_conn_path_connect+0x2ab/0x6e0 net/rds/tcp_connect.c:-1
rds_connect_worker+0x1ce/0x280 net/rds/threads.c:176
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
wireguard: wg1: Handshake for peer 47 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 2)
bridge9: hello timer expired
bridge0: hello timer expired
nf_conntrack: new packet for ffff888019a78c00
nf_nat: Already setup manip DST for ct ffff888019a78c00 (status bits 0x188)