INFO: task syz.2.686:9129 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-12886-ga1b5bd45d4ee #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.686       state:D stack:27992 pid:9129  tgid:9126  ppid:5840   task_flags:0x400040 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 __mutex_lock_common kernel/locking/mutex.c:678 [inline]
 __mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
 nfsd_nl_threads_get_doit+0x1c6/0x7c0 fs/nfsd/nfsctl.c:1713
 genl_family_rcv_msg_doit+0x206/0x2f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
 __sys_sendmsg+0x16d/0x220 net/socket.c:2652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc44b8d169
RSP: 002b:00007fdc45a01038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fdc44da6080 RCX: 00007fdc44b8d169
RDX: 0000000000000004 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007fdc44c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fdc44da6080 R15: 00007ffc1cf3cb48
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by syz-executor/5849:
 #0: ffff88805cf640e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88805cf640e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88805cf640e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
 #0: ffff88805cf640e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
 #1: ffffffff8e7cd1e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596
3 locks held by kworker/u8:19/8315:
 #0: ffff88801c2f6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc9000ad6fd18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffffffff90115ed0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xc9/0xb30 net/core/net_namespace.c:608
2 locks held by syz.2.686/9127:
 #0: ffffffff901cd990 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8e7cd1e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xdd/0x1a40 fs/nfsd/nfsctl.c:1923
2 locks held by syz.2.686/9129:
 #0: ffffffff901cd990 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8e7cd1e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_get_doit+0x1c6/0x7c0 fs/nfsd/nfsctl.c:1713
2 locks held by syz.3.801/9672:
 #0: ffff8880343580e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880343580e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff8880343580e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
 #0: ffff8880343580e0 (&type->s_umount_key#50){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
 #1: ffffffff8e7cd1e8 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:596
2 locks held by getty/11180:
 #0: ffff8880315bb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900193f92f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
2 locks held by syz.4.1050/11182:
1 lock held by syz.6.1051/11185:
3 locks held by syz.7.1066/11237:
2 locks held by syz.5.1069/11246:
 #0: ffffffff9012bd68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffffffff9012bd68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 #0: ffffffff9012bd68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink+0x277/0xa80 net/core/rtnetlink.c:3556
 #1: ffffffff8e3ccab8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x280/0x3c0 kernel/rcu/tree_exp.h:304
2 locks held by syz.5.1069/11247:
 #0: ffffffff90115ed0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:514
 #1: ffffffff9012bd68 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x1b/0x70 net/ipv4/nexthop.c:3918

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-12886-ga1b5bd45d4ee #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xf70/0x12c0 kernel/hung_task.c:437
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 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: 11247 Comm: syz.5.1069 Not tainted 6.14.0-syzkaller-12886-ga1b5bd45d4ee #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5867 [inline]
RIP: 0010:lock_acquire+0x14f/0x350 kernel/locking/lockdep.c:5823
Code: 00 00 85 d2 0f 85 8c 00 00 00 9c 8f 04 24 fa 48 c7 c7 39 a6 cd 8d e8 50 7c d7 09 45 89 e0 89 e9 44 89 ea 65 ff 05 09 5d 0e 12 <48> 81 24 24 00 02 00 00 44 89 f6 48 89 df 6a 00 6a 00 6a 00 ff b4
RSP: 0018:ffffc90000a07f30 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff8e3c1580 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8dcda639 RDI: ffffffff8bf44c60
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000011fb0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f9c332866c0(0000) GS:ffff888124abc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c332449a0 CR3: 000000007879a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2389 [inline]
 slab_free mm/slub.c:4646 [inline]
 kfree+0x2b6/0x4d0 mm/slub.c:4845
 ieee80211_inform_bss+0x77c/0x1140 net/mac80211/scan.c:160
 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline]
 cfg80211_inform_single_bss_data+0x8e7/0x1df0 net/wireless/scan.c:2367
 cfg80211_inform_bss_data+0x224/0x3bd0 net/wireless/scan.c:3222
 cfg80211_inform_bss_frame_data+0x26e/0x7a0 net/wireless/scan.c:3317
 ieee80211_bss_info_update+0x310/0xab0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x475/0xae0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5179 [inline]
 ieee80211_rx_list+0x1bdb/0x2980 net/mac80211/rx.c:5416
 ieee80211_rx_napi+0xdc/0x410 net/mac80211/rx.c:5439
 ieee80211_rx include/net/mac80211.h:5179 [inline]
 ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:441
 tasklet_action_common+0x281/0x400 kernel/softirq.c:829
 handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:insert_entry fs/proc/proc_sysctl.c:148 [inline]
RIP: 0010:insert_header+0x2e6/0x1480 fs/proc/proc_sysctl.c:252
Code: fc ff df 48 c1 e8 03 48 01 e8 48 89 44 24 40 48 8b 44 24 38 48 c1 e8 03 48 01 e8 48 89 44 24 18 e8 4f ad 5e ff 48 8b 44 24 40 <80> 38 00 0f 85 d4 0e 00 00 48 b8 b7 6d db b6 6d db b6 6d 48 8b 54
RSP: 0018:ffffc90019b67198 EFLAGS: 00000246
RAX: ffffed1006edde08 RBX: ffff8880376ed008 RCX: ffffc9001b49e000
RDX: 0000000000080000 RSI: ffffffff825c92d1 RDI: 0000000000000006
RBP: dffffc0000000000 R08: 0000000000000006 R09: 0000000000000021
R10: 000000000000001f R11: 0000000000000000 R12: 0000000000000003
R13: ffff8880376ef1d8 R14: 000000000000001f R15: ffff8880376ef000
 __register_sysctl_table+0x70a/0x1900 fs/proc/proc_sysctl.c:1396
 __devinet_sysctl_register+0x1b9/0x360 net/ipv4/devinet.c:2678
 devinet_sysctl_register net/ipv4/devinet.c:2718 [inline]
 devinet_sysctl_register+0x17b/0x200 net/ipv4/devinet.c:2708
 inetdev_init+0x2b8/0x5a0 net/ipv4/devinet.c:291
 inetdev_event+0xc5f/0x18a0 net/ipv4/devinet.c:1591
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:85
 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2180
 call_netdevice_notifiers_extack net/core/dev.c:2218 [inline]
 call_netdevice_notifiers net/core/dev.c:2232 [inline]
 register_netdevice+0x17d0/0x2040 net/core/dev.c:11048
 __ip_tunnel_create+0x4a8/0x680 net/ipv4/ip_tunnel.c:268
 ip_tunnel_init_net+0x22f/0x7d0 net/ipv4/ip_tunnel.c:1161
 vti_init_net+0x2e/0x140 net/ipv4/ip_vti.c:517
 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138
 setup_net+0x21e/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:518
 create_new_namespaces+0x3ea/0xad0 kernel/nsproxy.c:110
 copy_namespaces+0x468/0x560 kernel/nsproxy.c:179
 copy_process+0x29ff/0x91a0 kernel/fork.c:2432
 kernel_clone+0xfc/0x960 kernel/fork.c:2844
 __do_sys_clone+0xce/0x120 kernel/fork.c:2987
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c3238d169
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:00007f9c33285fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f9c325a6080 RCX: 00007f9c3238d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040100000
RBP: 00007f9c3240e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9c325a6080 R15: 00007fff3bf19568
 </TASK>