INFO: task kworker/u8:1:13 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1    state:D stack:17864 pid:13    tgid:13    ppid:2      task_flags:0x4208160 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5402 [inline]
 __schedule+0x16f9/0x5500 kernel/sched/core.c:7204
 __schedule_loop kernel/sched/core.c:7283 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7298
 rxrpc_destroy_all_calls+0x44e/0x570 net/rxrpc/call_object.c:754
 rxrpc_exit_net+0x6f/0xc0 net/rxrpc/net_ns.c:112
 ops_exit_list net/core/net_namespace.c:199 [inline]
 ops_undo_list+0x49f/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56e/0x800 net/core/net_namespace.c:702
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3318
 process_scheduled_works kernel/workqueue.c:3401 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3482
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
 #0: ffff88801b69e138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3293
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3294
 #2: ffffffff8f380c60 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:673
1 lock held by khungtaskd/39:
 #0: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6777
2 locks held by getty/5368:
 #0: ffff888035e2d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by syz.7.9017/4948:
 #0: ffff888053b014c8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:11490
4 locks held by syz.6.9026/4987:
 #0: ffff8880866b7030 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:592 [inline]
 #0: ffff8880866b7030 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x194/0x9e0 mm/mmap.c:1284
 #1: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #1: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #1: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200 mm/pgtable-generic.c:290
 #2: ffff888040636058 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #2: ffff888040636058 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:404
 #3: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #3: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #3: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 #3: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
1 lock held by syz.9.9027/4995:
 #0: ffff888080834358 (sk_lock-AF_LLC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #0: ffff888080834358 (sk_lock-AF_LLC){+.+.}-{0:0}, at: llc_ui_wait_for_conn net/llc/af_llc.c:606 [inline]
 #0: ffff888080834358 (sk_lock-AF_LLC){+.+.}-{0:0}, at: llc_ui_connect+0x6a7/0xd60 net/llc/af_llc.c:518
5 locks held by syz.9.9027/4996:
 #0: ffff888080834358 (sk_lock-AF_LLC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #0: ffff888080834358 (sk_lock-AF_LLC){+.+.}-{0:0}, at: llc_ui_sendmsg+0x494/0xea0 net/llc/af_llc.c:968
 #1: ffff8880b8642d18 (&pcp->lock){+.+.}-{3:3}, at: rmqueue_pcplist mm/page_alloc.c:3368 [inline]
 #1: ffff8880b8642d18 (&pcp->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3409 [inline]
 #1: ffff8880b8642d18 (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x89e/0x26e0 mm/page_alloc.c:3943
 #2: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #2: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #2: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: __rt_spin_trylock kernel/locking/spinlock_rt.c:110 [inline]
 #2: ffffffff8dfcac60 (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x10c/0x2b0 kernel/locking/spinlock_rt.c:118
 #3: ffff888074d8c8f8 (&p->pi_lock){-...}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline]
 #3: ffff888074d8c8f8 (&p->pi_lock){-...}-{2:2}, at: try_to_wake_up+0x66/0x1380 kernel/sched/core.c:4203
 #4: ffff8880b863b8a0 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:661
2 locks held by sed/5000:
 #0: ffff888080a12cb0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:611 [inline]
 #0: ffff888080a12cb0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:441 [inline]
 #0: ffff888080a12cb0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x36/0x340 mm/mmap_lock.c:501
 #1: ffff88813fffbb98 (&zone->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
 #1: ffff88813fffbb98 (&zone->lock){+.+.}-{3:3}, at: rmqueue_buddy mm/page_alloc.c:3223 [inline]
 #1: ffff88813fffbb98 (&zone->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3415 [inline]
 #1: ffff88813fffbb98 (&zone->lock){+.+.}-{3:3}, at: get_page_from_freelist+0xcaf/0x26e0 mm/page_alloc.c:3943

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 39 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd3/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4996 Comm: syz.9.9027 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__bfs kernel/locking/lockdep.c:1817 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1862 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2798 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3171 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3286 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3910 [inline]
RIP: 0010:__lock_acquire+0x197b/0x2d10 kernel/locking/lockdep.c:5239
Code: 13 25 ff 0f 00 00 39 05 1f 2a dc 11 73 06 89 05 17 2a dc 11 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 b0 7d e9
RSP: 0018:ffffc90007b7eb38 EFLAGS: 00000006
RAX: ffffffff960db858 RBX: 0000000000000145 RCX: 0000000000000007
RDX: ffffffff9600a2d8 RSI: ffff88803224abf0 RDI: 0000000000000145
RBP: 888b32c94390c9fb R08: ffffc90007b7eb00 R09: 0000000000000020
R10: ffffc90007b7ed50 R11: ffffffff81a12080 R12: ffffffff9601c948
R13: ffffffff931e4258 R14: ffff888032249f00 R15: 0000000000000006
FS:  00007fc20ebf56c0(0000) GS:ffff888125ecd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056343333b008 CR3: 0000000032f7c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
 debug_object_activate+0xa8/0x3a0 lib/debugobjects.c:845
 debug_hrtimer_activate kernel/time/hrtimer.c:485 [inline]
 debug_activate kernel/time/hrtimer.c:528 [inline]
 remove_and_enqueue_same_base kernel/time/hrtimer.c:1259 [inline]
 __hrtimer_start_range_ns kernel/time/hrtimer.c:1402 [inline]
 hrtimer_start_range_ns_common+0x4cd/0xba0 kernel/time/hrtimer.c:1481
 hrtimer_start_range_ns+0x111/0x3f0 kernel/time/hrtimer.c:1503
 enqueue_task+0x75/0x410 kernel/sched/core.c:2178
 activate_task kernel/sched/core.c:2218 [inline]
 ttwu_do_activate+0x1cc/0x660 kernel/sched/core.c:3738
 ttwu_queue kernel/sched/core.c:3991 [inline]
 try_to_wake_up+0x724/0x1380 kernel/sched/core.c:4315
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:574 [inline]
 rt_mutex_slowunlock+0x5b8/0x8b0 kernel/locking/rtmutex.c:1482
 spin_unlock_irqrestore include/linux/spinlock_rt.h:129 [inline]
 rmqueue_bulk mm/page_alloc.c:2555 [inline]
 __rmqueue_pcplist+0x1322/0x1bf0 mm/page_alloc.c:3341
 rmqueue_pcplist mm/page_alloc.c:3379 [inline]
 rmqueue mm/page_alloc.c:3409 [inline]
 get_page_from_freelist+0x91d/0x26e0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5300
 alloc_slab_page mm/slub.c:3289 [inline]
 allocate_slab+0x74/0x5e0 mm/slub.c:3404
 new_slab mm/slub.c:3447 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7216
 refill_sheaf mm/slub.c:2827 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4665
 alloc_from_pcs mm/slub.c:4763 [inline]
 slab_alloc_node mm/slub.c:4897 [inline]
 kmem_cache_alloc_noprof+0x433/0x680 mm/slub.c:4919
 skb_clone+0x212/0x3a0 net/core/skbuff.c:2108
 llc_prepare_and_xmit net/llc/llc_s_ac.c:47 [inline]
 llc_sap_action_send_xid_c+0x20c/0x360 net/llc/llc_s_ac.c:94
 llc_exec_sap_trans_actions net/llc/llc_sap.c:147 [inline]
 llc_sap_next_state net/llc/llc_sap.c:176 [inline]
 llc_sap_state_process+0x265/0x510 net/llc/llc_sap.c:203
 llc_ui_sendmsg+0xaaa/0xea0 net/llc/af_llc.c:996
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:797
 __sock_sendmsg net/socket.c:812 [inline]
 ____sys_sendmsg+0x55c/0x870 net/socket.c:2716
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2770
 __sys_sendmmsg+0x282/0x4e0 net/socket.c:2859
 __do_sys_sendmmsg net/socket.c:2886 [inline]
 __se_sys_sendmmsg net/socket.c:2883 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2883
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc2109bce59
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:00007fc20ebf5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc210c36090 RCX: 00007fc2109bce59
RDX: 03fffffffffffeed RSI: 0000200000001380 RDI: 0000000000000005
RBP: 00007fc210a52d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc210c36128 R14: 00007fc210c36090 R15: 00007ffd82bae728
 </TASK>