INFO: task syz.5.6105:24811 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.6105 state:D stack:25512 pid:24811 tgid:24810 ppid:16963 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7376
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xccb/0x1bd0 kernel/locking/mutex.c:821
nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2575
nfnetlink_rcv+0x1b3/0x440 net/netfilter/nfnetlink.c:667
netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1364
netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:800 [inline]
__sock_sendmsg net/socket.c:815 [inline]
____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2713
___sys_sendmsg+0x190/0x1e0 net/socket.c:2767
__sys_sendmsg+0x160/0x210 net/socket.c:2799
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdf519e159
RSP: 002b:00007fbdf6113028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbdf5425fa0 RCX: 00007fbdf519e159
RDX: 0000000004000050 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007fbdf523506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdf5426038 R14: 00007fbdf5425fa0 R15: 00007fff3f40eb48
Showing all locks held in the system:
locks held by rcu_tasks_kthre/29: 1, on CPU#0:
#0: ffffffff8edebc88 (rcu_tasks.tasks_gp_mutex){+.+.}-{4:4}, at: rcu_tasks_one_gp+0x622/0xd90 kernel/rcu/tasks.h:613
locks held by khungtaskd/32: 1, last CPU#0:
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by klogd/4954: 1, last CPU#0:
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: sock_def_readable+0x90/0x600 net/core/sock.c:3665
locks held by getty/5350: 2, on CPU#0:
#0: ffff888029b050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000321e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by kworker/u8:2/16361: 3, last CPU#0:
#0: ffff88804db0e140 ((wq_completion)bond0#24){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
#1: ffffc9000546fd08 ((work_completion)(&(&slave->notify_work)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
#2: ffffffff90cd48c0 (rtnl_mutex){+.+.}-{4:4}, at: bond_netdev_notify_work+0x7c/0x2c0 drivers/net/bonding/bond_main.c:1810
locks held by kworker/u8:10/16368: 2, on CPU#0:
#0: ffff88801c094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
#1: ffffc900053cfd08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by syz.8.6104/24804: 3, last CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
#1: ffff8880824516e8 (nlk_cb_mutex-NETFILTER){+.+.}-{4:4}, at: __netlink_dump_start+0x150/0x990 net/netlink/af_netlink.c:2429
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_release include/linux/rcupdate.h:319 [inline]
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_unlock include/linux/rcupdate.h:880 [inline]
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: cond_resched_rcu include/linux/rcupdate_wait.h:65 [inline]
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: hash_ipport4_list+0x2bb/0x1300 net/netfilter/ipset/ip_set_hash_gen.h:1568
locks held by syz.5.6105/24811: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.2.6149/25059: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.9.6175/25225: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.1.6197/25499: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.4.6233/25533: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.6.6285/25814: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz.0.6298/25907: 1, on CPU#0:
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnl_lock net/netfilter/nfnetlink.c:96 [inline]
#0: ffffffff9be06f20 (nfnl_subsys_ipset){+.+.}-{4:4}, at: nfnetlink_rcv_msg+0x8ad/0x11e0 net/netfilter/nfnetlink.c:293
locks held by syz-executor/25938: 1, on CPU#0:
#0: ffffffff90cd48c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff90cd48c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
#0: ffffffff90cd48c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xac3/0x2620 net/core/rtnetlink.c:4219
locks held by syz.5.6306/25962: 3, last CPU#0:
#0: ffff8880559ac460 (sb_writers#6){.+.+}-{0:0}, at: get_signal+0x1f2a/0x21e0 kernel/signal.c:3097
#1: ffff8880370ad0f0 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#1: ffff8880370ad0f0 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3430
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#2: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: avc_has_perm_noaudit+0x56/0x470 security/selinux/avc.c:1158
locks held by syz.8.6316/25993: 2, last CPU#0:
#0: ffff8880696506c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8edec4e0 (rcu_read_lock){....}-{1:3}, at: __update_page_owner_handle+0x63/0x530 mm/page_owner.c:273
locks held by kworker/u8:10/25997: 2, last CPU#0:
#0: ffff88801efe3160 (&sig->cred_guard_mutex){+.+.}-{4:4}, at: prepare_bprm_creds fs/exec.c:1423 [inline]
#0: ffff88801efe3160 (&sig->cred_guard_mutex){+.+.}-{4:4}, at: bprm_execve+0xa3/0x1940 fs/exec.c:1846
#1: ffff8880249dde20 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
#1: ffff8880249dde20 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: lookup_slow+0x42/0x70 fs/namei.c:1935
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245